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Retirement and Postretirement Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Net Periodic Benefit Costs |  |  |  |
Net gains related to settlement, curtailment, and special termination benefits | $ 5 | $ 24 | $ 121 | $ 24
Contributions to qualified and supplemental plans | 30 | 7 | 132 | 8
Pension Benefit |  |  |  |
Net Periodic Benefit Costs |  |  |  |
Net periodic benefit costs | 0 | 15 | 22 | 19
Postretirement Benefit |  |  |  |
Net Periodic Benefit Costs |  |  |  |
Net periodic benefit costs | $ 18 | $ 19 | $ 56 | $ 48

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