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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | $ 37,635 | $ 46,058 | $ 38,257
Other comprehensive income (loss), net of taxes | 216 | (393) | (339)
Ending balance | 46,372 | 37,635 | 46,058
Derivatives |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | (24) | 73 | 144
Other comprehensive income (loss) before reclassification adjustments, pretax | 508 | 114 | 684
Tax | (109) | (24) | (143)
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 399 | 90 | 541
Reclassification adjustments, pretax | (168) | (237) | (775)
Tax | 35 | 50 | 163
Reclassification adjustments, net of taxes | (133) | (187) | (612)
Other comprehensive income (loss), net of taxes | 266 | (97) | (71)
Ending balance | 242 | (24) | 73
Employee Benefit Plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | (2,793) | (2,408) | (2,743)
Other comprehensive income (loss) before reclassification adjustments, pretax | 647 | (413) | 70
Tax | (138) | 86 | 12
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 509 | (327) | 82
Reclassification adjustments, pretax | (60) | (64) | 329
Tax | 17 | 6 | (76)
Reclassification adjustments, net of taxes | (43) | (58) | 253
Other comprehensive income (loss), net of taxes | 466 | (385) | 335
Ending balance | (2,327) | (2,793) | (2,408)
Pension Plan Net Loss |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Pension and other postretirement benefit plans, net loss (gain) and prior service (credit) included in AOCI | 3,000 | 3,500 |
Other Postretirement Benefit Plan Net Gain |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Pension and other postretirement benefit plans, net loss (gain) and prior service (credit) included in AOCI | (400) | (500) |
Pension Plan Prior Service Credit |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Pension and other postretirement benefit plans, net loss (gain) and prior service (credit) included in AOCI | (174) | (141) |
Other Postretirement Benefit Plan Prior Service Credit |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Pension and other postretirement benefit plans, net loss (gain) and prior service (credit) included in AOCI | (61) | (95) |
Foreign Currency Translation Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | (2,344) | (2,433) | (1,830)
Other comprehensive income (loss) before reclassification adjustments, pretax | (559) | 17 | (584)
Tax | 23 | 63 | (19)
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (536) | 80 | (603)
Reclassification adjustments, pretax | 20 | 9 | 0
Tax | 0 | 0 | 0
Reclassification adjustments, net of taxes | 20 | 9 | 0
Other comprehensive income (loss), net of taxes | (516) | 89 | (603)
Ending balance | (2,860) | (2,344) | (2,433)
Accumulated Other Comprehensive Loss |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | (5,161) | (4,768) | (4,429)
Other comprehensive income (loss) before reclassification adjustments, pretax | 596 | (282) | 170
Tax | (224) | 125 | (150)
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 372 | (157) | 20
Reclassification adjustments, pretax | (208) | (292) | (446)
Tax | 52 | 56 | 87
Reclassification adjustments, net of taxes | (156) | (236) | (359)
Other comprehensive income (loss), net of taxes | 216 | (393) | (339)
Ending balance | $ (4,945) | $ (5,161) | $ (4,768)

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