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Retirement and Postretirement Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Net Periodic Benefit Costs |  |
Net gains related to pension settlement and curtailment | $ 6 | $ 14
Net periodic benefit costs related to pension special termination benefits | 0 | 16
Contributions to qualified and supplemental pension plans | 147 | 91
Pension Benefit |  |
Net Periodic Benefit Costs |  |
Net periodic benefit costs (gains) | (5) | 12
Postretirement Benefit |  |
Net Periodic Benefit Costs |  |
Net periodic benefit costs (gains) | $ 20 | $ 20

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- Definition Defined Benefit Plan, Recognized Net Gain (Loss) Due to Special Termination Benefits + References No definition available. + Details
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