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Retirement and Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Postretirement and Other Benefit Plans Disclosure |  |
Contributions to defined benefit plans | $ 1 | $ 147
Pension Benefit |  |
Postretirement and Other Benefit Plans Disclosure |  |
Net periodic benefit costs (gains) | 0 | (11)
Postretirement Benefit |  |
Postretirement and Other Benefit Plans Disclosure |  |
Net periodic benefit costs (gains) | $ 19 | $ 20

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