| Item | Type | Period | Balance | Description | | Retirement Benefits | text | | | |
| Disclosure Text Block Supplement | text | | | |
| Pension and Other Postretirement Benefits Disclosure | text | | | The entire disclosure for pension and other postretirement benefits. |
| Table Text Block Supplement | text | | | |
| Compensation and Employee Benefit Plans | text | | | The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. |
| Compensation and Employee Benefit Plans, Other than Share-based Compensation | text | | | The entire disclosure of an entity's employee compensation and benefit plans, excluding share-based compensation and including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, life insurance, severance, health care, unemployment and other benefit plans. |
| Coal Industry Retiree Health Benefit Act of 1992 | text | | | |
| Defined Benefit Plan | text | | | |
| Defined Contribution Plan | text | | | |
| Retirement Benefits, Description | text | | | |
| Japanese Welfare Pension Insurance Law | text | | | |
| Multiemployer Plans | text | | | |
| Multiple-Employer Plan Accounted for as Multiemployer Plan | text | | | |
| Pension and Other Postretirement Benefits Cost (Reversal of Cost) | text | | | |
| Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures | text | | | |
| Coal Industry Retiree Health Benefit Act of 1992, Impact, Description | text | | | Description of impact of providing medical and death benefits under Coal Industry Retiree Health Benefit Act of 1992. |
| Coal Industry Retiree Health Benefit Act of 1992, Estimated Amount of Obligation | $ | instant | credit | Amount of obligation for medical and death benefits to be provided under Coal Industry Retiree Health Benefit Act of 1992. |
| Coal Industry Retiree Health Benefit Act of 1992, Method of Accounting Adopted | text | | | Description of method of accounting adopted for obligation to provide medical and death benefits under Coal Industry Retiree Health Benefit Act of 1992. |
| Defined Benefit Plan, Description | text | | | Description of defined benefit pension and other postretirement plans. Includes, but is not limited to, employee group covered, type of benefit formula, type of benefits, cost sharing arrangement, funding policy, type of assets held, significant nonbenefit liabilities and information pertaining to multiple employer plan. |
| Schedule of Defined Benefit Plans Disclosures | text | | | Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. |
| Defined Contribution Plan Disclosures | text | | | Tabular disclosure of defined contribution pension plans or defined contribution other postretirement plans, separately for pension plans and other postretirement benefit plans. |
| Retirement Benefits, Description | text | | | Description of nature and type of retirement benefits. Includes, but is not limited to, plan utilized, employee group covered, type of plan formula and funding policy. |
| Japanese Welfare Pension Insurance Law, Government Subsidy | $ | instant | debit | Amount of subsidy from transfer of employee pension fund liability to Japanese government. |
| Japanese Welfare Pension Insurance Law, Previously Accrued Salary Progression Derecognition | $ | instant | debit | Amount of derecognition of previously accrued salary progression. |
| Schedule of Multiemployer Plans | text | | | Tabular disclosure of the quantitative and qualitative information related to multiemployer plans in which the employer participates. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. |
| Multiple-Employer Plan Accounted for as Multiemployer Plan, Plan Name | text | | | Name of defined benefit plan, defined as multiple-employer plan but accounted for as multiemployer plan, in which entity participates. |
| Multiple-Employer Plan Accounted for as Multiemployer Plan, Contribution by Participating Entity | $ | duration | credit | Amount of contributions made by entity participating in defined benefit plan, defined as multiple-employer plan but accounted for as multiemployer plan. |
| Pension Cost (Reversal of Cost) | $ | duration | debit | Amount of cost (reversal of cost) for pension benefits. Excludes other postretirement benefits. |
| Other Postretirement Benefits Cost (Reversal of Cost) | $ | duration | debit | Amount of cost (reversal of cost) for other postretirement benefits. Excludes pension benefits. |
| Pension and Other Postretirement Benefits Cost (Reversal of Cost), Total | $ | duration | debit | Amount of cost (reversal of cost) for pension and other postretirement benefits. |
| Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures | text | | | Disclosures and provisions pertaining to defined benefit pension plans or other postretirement defined benefit plans. The arrangements are generally based on terms and conditions stipulated by the entity, and which contain a promise by the employer to pay certain amounts or awards at designated future dates, including a period after retirement, upon compliance with stipulated requirements. Excludes disclosures pertaining to defined contribution plans. |