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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions | $ 24 | $ 55 |  | $ 271
Settlement charge |  | $ 1,511 |  |
Forecast |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions |  |  | $ 175 |

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