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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | $ 46,058 | $ 38,257 | $ 25,404
Other comprehensive income (loss), net of taxes | (393) | (339) | 1,756
Spin-off of Organon & Co. |  |  | 5,091
Ending balance | 37,635 | 46,058 | 38,257
Derivatives |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | 73 | 144 | (266)
Other comprehensive income (loss) before reclassification adjustments, pretax | 114 | 684 | 333
Tax | (24) | (143) | (75)
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 90 | 541 | 258
Reclassification adjustments, pretax | (237) | (775) | 192
Tax | 50 | 163 | (40)
Reclassification adjustments, net of taxes | (187) | (612) | 152
Other comprehensive income (loss), net of taxes | (97) | (71) | 410
Spin-off of Organon & Co. |  |  | 0
Ending balance | (24) | 73 | 144
Employee Benefit Plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | (2,408) | (2,743) | (4,540)
Other comprehensive income (loss) before reclassification adjustments, pretax | (413) | 70 | 1,737
Tax | 86 | 12 | (332)
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (327) | 82 | 1,405
Reclassification adjustments, pretax | (64) | 329 | 466
Tax | 6 | (76) | (102)
Reclassification adjustments, net of taxes | (58) | 253 | 364
Other comprehensive income (loss), net of taxes | (385) | 335 | 1,769
Spin-off of Organon & Co. |  |  | 28
Ending balance | (2,793) | (2,408) | (2,743)
Pension Plan Net Loss |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Pension and other postretirement benefit plans, net loss and prior service (credit) included in AOCI | 3,500 | 3,100 |
Other Postretirement Benefit Plan Net Gain |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Pension and other postretirement benefit plans, net loss and prior service (credit) included in AOCI | (500) | (446) |
Pension Plan Prior Service Credit |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Pension and other postretirement benefit plans, net loss and prior service (credit) included in AOCI | (141) | (152) |
Other Postretirement Benefit Plan Prior Service Credit |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Pension and other postretirement benefit plans, net loss and prior service (credit) included in AOCI | (95) | (135) |
Foreign Currency Translation Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | (2,433) | (1,830) | (1,828)
Other comprehensive income (loss) before reclassification adjustments, pretax | 17 | (584) | (304)
Tax | 63 | (19) | (119)
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 80 | (603) | (423)
Reclassification adjustments, pretax | 9 | 0 | 0
Tax | 0 | 0 | 0
Reclassification adjustments, net of taxes | 9 | 0 | 0
Other comprehensive income (loss), net of taxes | 89 | (603) | (423)
Spin-off of Organon & Co. |  |  | 421
Ending balance | (2,344) | (2,433) | (1,830)
Accumulated Other Comprehensive Loss |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | (4,768) | (4,429) | (6,634)
Other comprehensive income (loss) before reclassification adjustments, pretax | (282) | 170 | 1,766
Tax | 125 | (150) | (526)
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (157) | 20 | 1,240
Reclassification adjustments, pretax | (292) | (446) | 658
Tax | 56 | 87 | (142)
Reclassification adjustments, net of taxes | (236) | (359) | 516
Other comprehensive income (loss), net of taxes | (393) | (339) | 1,756
Spin-off of Organon & Co. |  |  | 449
Ending balance | $ (5,161) | $ (4,768) | $ (4,429)

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