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Postretirement Benefits Other than Pensions - General Information (Details) - Postretirement Health Coverage [Member] - age | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2001
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, funding status | us-gaap:UnfundedPlanMember |
Minimum age of retirement under option one to avail benefit of post retirement | 55 years |
Minimum service period served at the time of retirement under option one to avail benefit of post retirement | 15 years |
Minimum age of retirement under option two to avail benefit of post retirement | 65 |
Minimum service period served at time of retirement under option two to avail benefit of post retirement | 10 years |
Minimum for age plus years of service of retirement under amended plan to avail benefit of post retirement |  | 60
Minimum service period served at the time of retirement under amended plan to avail benefit of post retirement |  | 10 years

X
- Definition Minimum retirement age to receive benefits if participant has reached fifteen years of service. + References No definition available. + Details
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- Definition Minimum retirement age to receive benefits if participant has reached ten years of service. + References No definition available. + Details
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- Definition Minimum of age plus years of service for eligibility under the plan when the plan was amended in 2001. + References No definition available. + Details
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- Definition Minimum years of service for eligibility under the plan when the plan was amended in 2001. + References No definition available. + Details
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- Definition Service requirement for a participant to retire at age 55 and receive benefits. + References No definition available. + Details
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- Definition Service requirement for a participant to retire at age 65 and receive benefits. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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