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Pension and Other Postretirement Benefit Plans - Obligation and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other Postretirement Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets January 1 $ 1,221 $ 1,102  
Actual return on plan assets 118 175  
Company contributions 33 19  
Effects of exchange rate changes 0 0  
Benefits paid (86) (93)  
Settlements 0 0  
Spin-off of Organon 0 0  
Other 6 18  
Fair value of plan assets December 31 1,292 1,221 $ 1,102
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation January 1 1,607 1,673  
Service cost 48 52 48
Interest cost 45 57 69
Actuarial (gains) losses (103) (98)  
Benefits paid (86) (93)  
Effects of exchange rate changes (1) (3)  
Plan amendments 0 0  
Curtailments (12) (1)  
Termination benefits 37 2 5
Settlements 0 0  
Spin-off of Organon 0 0  
Other 6 18  
Benefit obligation December 31 1,541 1,607 1,673
Funded status December 31 (249) (386)  
Recognized as:      
Other Assets 0 0  
Accrued and other current liabilities (8) (9)  
Other Noncurrent Liabilities (241) (377)  
United States | Pension Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets January 1 12,672 11,361  
Actual return on plan assets 1,250 1,908  
Company contributions 305 199  
Effects of exchange rate changes 0 0  
Benefits paid (219) (751)  
Settlements (941) (45)  
Spin-off of Organon 0 0  
Other 0 0  
Fair value of plan assets December 31 13,067 12,672 11,361
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation January 1 14,613 13,003  
Service cost 403 360 293
Interest cost 404 431 458
Actuarial (gains) losses (332) 1,594  
Benefits paid (219) (751)  
Effects of exchange rate changes 0 0  
Plan amendments 0 0  
Curtailments 15 11  
Termination benefits 56 10 31
Settlements (941) (45)  
Spin-off of Organon 0 0  
Other 0 0  
Benefit obligation December 31 13,999 14,613 13,003
Funded status December 31 (932) (1,941)  
Recognized as:      
Other Assets 9 0  
Accrued and other current liabilities (64) (82)  
Other Noncurrent Liabilities (877) (1,859)  
International | Pension Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets January 1 12,009 10,135  
Actual return on plan assets 891 1,026  
Company contributions 189 383  
Effects of exchange rate changes (671) 743  
Benefits paid (233) (214)  
Settlements (55) (117)  
Spin-off of Organon (55) 0  
Other 120 53  
Fair value of plan assets December 31 12,195 12,009 10,135
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation January 1 12,458 10,558  
Service cost 328 297 235
Interest cost 123 136 176
Actuarial (gains) losses (240) 1,032  
Benefits paid (233) (214)  
Effects of exchange rate changes (678) 788  
Plan amendments 4 (64)  
Curtailments (38) (8)  
Termination benefits 5 3 8
Settlements (55) (117)  
Spin-off of Organon (118) 0  
Other 19 47  
Benefit obligation December 31 11,575 12,458 $ 10,558
Funded status December 31 620 (449)  
Recognized as:      
Other Assets 1,395 941  
Accrued and other current liabilities (22) (13)  
Other Noncurrent Liabilities $ (753) $ (1,377)