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Pension and Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2024 | Apr. 01, 2024
Benefit Plan Information |  |  |  |
Discontinued operation, pension plan benefit obligation |  |  |  | $ 2,700
Discontinued operation, postretirement plan benefit obligation |  |  |  | $ 2,400
Settlements, curtailments, special termination benefits and other | $ 795 |  |  |
Impact of remeasurement |  | $ 70 | $ 220 |
U.S. Pension Plans |  |  |  |
Benefit Plan Information |  |  |  |
Company contributions |  |  | $ 81 |
Pension payment obligations transferred | $ 2,500 |  |  |
U.S. Pension Plans | United States |  |  |  |
Benefit Plan Information |  |  |  |
Discount rate | 5.43% | 5.22% | 5.43% |
Percentage increase (decrease) in discount rate obligation from the prior year |  | 24.00% |  |
U.S. Pension Plans | Minimum |  |  |  |
Benefit Plan Information |  |  |  |
Estimated pension contributions for current fiscal year | $ 100 |  | $ 100 |
U.S. Pension Plans | Maximum |  |  |  |
Benefit Plan Information |  |  |  |
Estimated pension contributions for current fiscal year | $ 200 |  | 200 |
Postretirement Benefits |  |  |  |
Benefit Plan Information |  |  |  |
Company contributions |  |  | $ 5 |
Discount rate |  | 5.19% |  |
Percentage increase (decrease) in discount rate obligation from the prior year |  | 25.00% |  |

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