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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 02, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | $ 25,404 | $ 26,001 | $ 26,882
Other comprehensive income (loss) before reclassification adjustments, pretax |  | 1,951 | (915) | (610)
Tax |  | (568) | 284 | 161
Other comprehensive income (loss) before reclassification adjustments, net of taxes |  | 1,383 | (631) | (449)
Reclassification adjustments, pretax |  | 473 | 253 | (239)
Tax |  | (100) | (63) | 40
Reclassification adjustments, net of taxes |  | 373 | 190 | (199)
Other comprehensive income (loss), net of taxes |  | 1,756 | (441) | (648)
Spin-off of Organon & Co. |  | 5,091 |  |
Ending balance |  | 38,257 | 25,404 | 26,001
Derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | (266) | 31 | 166
Other comprehensive income (loss) before reclassification adjustments, pretax |  | 333 | (383) | 86
Tax |  | (75) | 84 | (15)
Other comprehensive income (loss) before reclassification adjustments, net of taxes |  | 258 | (299) | 71
Reclassification adjustments, pretax |  | 192 | 2 | (261)
Tax |  | (40) | 0 | 55
Reclassification adjustments, net of taxes |  | 152 | 2 | (206)
Other comprehensive income (loss), net of taxes |  | 410 | (297) | (135)
Spin-off of Organon & Co. |  | 0 |  |
Ending balance |  | 144 | (266) | 31
Investments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | 0 | 18 | (78)
Other comprehensive income (loss) before reclassification adjustments, pretax |  | 0 | 3 | 140
Tax |  | 0 | 0 | 0
Other comprehensive income (loss) before reclassification adjustments, net of taxes |  | 0 | 3 | 140
Reclassification adjustments, pretax |  | 0 | (21) | (44)
Tax |  | 0 | 0 | 0
Reclassification adjustments, net of taxes |  | 0 | (21) | (44)
Other comprehensive income (loss), net of taxes |  | 0 | (18) | 96
Spin-off of Organon & Co. |  | 0 |  |
Ending balance |  | 0 | 0 | 18
Employee Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | (4,540) | (4,261) | (3,556)
Other comprehensive income (loss) before reclassification adjustments, pretax |  | 1,922 | (599) | (948)
Tax |  | (374) | 111 | 192
Other comprehensive income (loss) before reclassification adjustments, net of taxes |  | 1,548 | (488) | (756)
Reclassification adjustments, pretax |  | 281 | 272 | 66
Tax |  | (60) | (63) | (15)
Reclassification adjustments, net of taxes |  | 221 | 209 | 51
Other comprehensive income (loss), net of taxes |  | 1,769 | (279) | (705)
Spin-off of Organon & Co. | $ 28 | 28 |  |
Ending balance |  | (2,743) | (4,540) | (4,261)
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 |  | 3,600 | 5,400 |
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 |  | (473) | (391) |
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 |  | (190) | (255) |
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 |  | (181) | (244) |
Foreign Currency Translation Adjustment |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | (1,828) | (1,981) | (2,077)
Other comprehensive income (loss) before reclassification adjustments, pretax |  | (304) | 64 | 112
Tax |  | (119) | 89 | (16)
Other comprehensive income (loss) before reclassification adjustments, net of taxes |  | (423) | 153 | 96
Reclassification adjustments, pretax |  | 0 | 0 | 0
Tax |  | 0 | 0 | 0
Reclassification adjustments, net of taxes |  | 0 | 0 | 0
Other comprehensive income (loss), net of taxes |  | (423) | 153 | 96
Spin-off of Organon & Co. | 421 | 421 |  |
Ending balance |  | (1,830) | (1,828) | (1,981)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | (6,634) | (6,193) | (5,545)
Spin-off of Organon & Co. | $ 449 | 449 |  |
Ending balance |  | $ (4,429) | $ (6,634) | $ (6,193)

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- Definition The change in equity as a result of a spin-off transaction (a regular or reverse spin-off) which is based on the recorded amounts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 60 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6406278&loc=d3e26268-112671 + Details
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