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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)