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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of Comprehensive Income [Abstract]      
Net Income Attributable to Merck & Co., Inc. $ 365 $ 14,519 $ 13,049
Other Comprehensive (Loss) Income Net of Taxes:      
Net unrealized (loss) gain on derivatives, net of reclassifications (97) (71) 410
Benefit plan net (loss) gain and prior service (cost) credit, net of amortization (385) 335 1,769
Cumulative translation adjustment 89 (603) (423)
Other comprehensive income (loss), net of taxes (393) (339) 1,756
Comprehensive (Loss) Income Attributable to Merck & Co., Inc. $ (28) $ 14,180 $ 14,805