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Pension and Postretirement Benefit Plans - Pension Asset Fair Values (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Levels 1, 2 and 3 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | $ 6,341 | $ 5,891 |
Defined Benefit Plan Assets, Excluding Reconciling Items | Level 1 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 490 | 554 |
Defined Benefit Plan Assets, Excluding Reconciling Items | Level 2 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 4,149 | 3,896 |
Defined Benefit Plan Assets, Excluding Reconciling Items | Level 3 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 588 | 447 |
Defined Benefit Plan Assets, Excluding Reconciling Items | Investments Measured at Net Asset Value | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,315 | 1,269 |
Defined Benefit Plan Assets, Excluding Reconciling Items | Levels 1, 2 and 3 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 6,542 | 6,166 |
Equities | Level 1 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 226 | 288 |
Equities | Level 2 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 513 | 252 |
Equities | Level 3 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1 | 2 |
Equities | Investments Measured at Net Asset Value | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 45 | 1 |
Equities | Levels 1, 2 and 3 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 785 | 543 |
Fixed income | Level 1 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 148 | 134 |
Fixed income | Level 2 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 3,501 | 3,542 |
Fixed income | Level 3 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 2 | 4 |
Fixed income | Investments Measured at Net Asset Value | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 719 | 623 |
Fixed income | Levels 1, 2 and 3 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 4,370 | 4,303 |
Private equity | Level 1 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 2 |
Private equity | Level 2 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 58 | 50 |
Private equity | Level 3 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 2 | 2 |
Private equity | Investments Measured at Net Asset Value | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 361 | 384 |
Private equity | Levels 1, 2 and 3 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 421 | 438 |
Absolute return | Level 1 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 10 | 8 |
Absolute return | Level 2 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1 | 1 |
Absolute return | Level 3 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 583 | 439 |
Absolute return | Investments Measured at Net Asset Value | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 189 | 259 |
Absolute return | Levels 1, 2 and 3 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 783 | 707 |
Cash and cash equivalents | Level 1 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 106 | 122 |
Cash and cash equivalents | Level 2 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 76 | 51 |
Cash and cash equivalents | Level 3 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Cash and cash equivalents | Investments Measured at Net Asset Value | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1 | 2 |
Cash and cash equivalents | Levels 1, 2 and 3 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 183 | 175 |
Other items to reconcile to fair value of plan assets | Levels 1, 2 and 3 | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | (201) | (275) |
U.S. Pension Plans | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 12,348 | 12,648 | $ 16,953
U.S. Pension Plans | International |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 6,341 | 5,891 | 8,016
U.S. Pension Plans | Levels 1, 2 and 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 12,348 | 12,648 |
U.S. Pension Plans | Defined Benefit Plan Assets, Excluding Reconciling Items | Level 1 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 2,407 | 2,234 |
U.S. Pension Plans | Defined Benefit Plan Assets, Excluding Reconciling Items | Level 2 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 6,511 | 5,909 |
U.S. Pension Plans | Defined Benefit Plan Assets, Excluding Reconciling Items | Level 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Plans | Defined Benefit Plan Assets, Excluding Reconciling Items | Investments Measured at Net Asset Value | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 3,867 | 4,645 |
U.S. Pension Plans | Defined Benefit Plan Assets, Excluding Reconciling Items | Levels 1, 2 and 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 12,785 | 12,788 |
U.S. Pension Plans | Equities | Level 1 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,246 | 871 |
U.S. Pension Plans | Equities | Level 2 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Plans | Equities | Level 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Plans | Equities | Investments Measured at Net Asset Value | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 174 | 271 |
U.S. Pension Plans | Equities | Levels 1, 2 and 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,420 | 1,142 |
U.S. Pension Plans | Fixed income | Level 1 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,153 | 1,354 |
U.S. Pension Plans | Fixed income | Level 2 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 6,428 | 5,803 |
U.S. Pension Plans | Fixed income | Level 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Plans | Fixed income | Investments Measured at Net Asset Value | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 16 | 91 |
U.S. Pension Plans | Fixed income | Levels 1, 2 and 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 7,597 | 7,248 |
U.S. Pension Plans | Private equity | Level 1 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Plans | Private equity | Level 2 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Plans | Private equity | Level 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Plans | Private equity | Investments Measured at Net Asset Value | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,622 | 1,700 |
U.S. Pension Plans | Private equity | Levels 1, 2 and 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,622 | 1,700 |
U.S. Pension Plans | Absolute return | Level 1 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1 | 1 |
U.S. Pension Plans | Absolute return | Level 2 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 83 | 85 |
U.S. Pension Plans | Absolute return | Level 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Plans | Absolute return | Investments Measured at Net Asset Value | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,314 | 1,794 |
U.S. Pension Plans | Absolute return | Levels 1, 2 and 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,398 | 1,880 |
U.S. Pension Plans | Cash and cash equivalents | Level 1 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 7 | 8 |
U.S. Pension Plans | Cash and cash equivalents | Level 2 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 21 |
U.S. Pension Plans | Cash and cash equivalents | Level 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Plans | Cash and cash equivalents | Investments Measured at Net Asset Value | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 741 | 789 |
U.S. Pension Plans | Cash and cash equivalents | Levels 1, 2 and 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 748 | 818 |
U.S. Pension Plans | Other items to reconcile to fair value of plan assets | Levels 1, 2 and 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | (437) | (140) |
Postretirement Benefits |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 980 | 1,017 | $ 1,353
Postretirement Benefits | Levels 1, 2 and 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 980 | 1,017 |
Postretirement Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | Level 1 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 245 | 285 |
Postretirement Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | Level 2 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 508 | 467 |
Postretirement Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | Level 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | Investments Measured at Net Asset Value | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 256 | 271 |
Postretirement Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | Levels 1, 2 and 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,009 | 1,023 |
Postretirement Benefits | Equities | Level 1 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 118 | 168 |
Postretirement Benefits | Equities | Level 2 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Equities | Level 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Equities | Investments Measured at Net Asset Value | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 11 | 16 |
Postretirement Benefits | Equities | Levels 1, 2 and 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 129 | 184 |
Postretirement Benefits | Fixed income | Level 1 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 92 | 96 |
Postretirement Benefits | Fixed income | Level 2 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 503 | 461 |
Postretirement Benefits | Fixed income | Level 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Fixed income | Investments Measured at Net Asset Value | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1 | 5 |
Postretirement Benefits | Fixed income | Levels 1, 2 and 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 596 | 562 |
Postretirement Benefits | Private equity | Level 1 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Private equity | Level 2 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Private equity | Level 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Private equity | Investments Measured at Net Asset Value | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 108 | 99 |
Postretirement Benefits | Private equity | Levels 1, 2 and 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 108 | 99 |
Postretirement Benefits | Absolute return | Level 1 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Absolute return | Level 2 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 5 | 5 |
Postretirement Benefits | Absolute return | Level 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Absolute return | Investments Measured at Net Asset Value | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 87 | 105 |
Postretirement Benefits | Absolute return | Levels 1, 2 and 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 92 | 110 |
Postretirement Benefits | Cash and cash equivalents | Level 1 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 35 | 21 |
Postretirement Benefits | Cash and cash equivalents | Level 2 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 1 |
Postretirement Benefits | Cash and cash equivalents | Level 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Cash and cash equivalents | Investments Measured at Net Asset Value | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 49 | 46 |
Postretirement Benefits | Cash and cash equivalents | Levels 1, 2 and 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 84 | 68 |
Postretirement Benefits | Other items to reconcile to fair value of plan assets | Levels 1, 2 and 3 | United States |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | $ (29) | $ (6) |

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