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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Statement of Comprehensive Income [Abstract]        
Net Income Attributable to Merck & Co., Inc. $ 3,157 $ 4,745 $ 13,374 $ 1,591
Other Comprehensive Loss Net of Taxes:        
Net unrealized (loss) gain on derivatives, net of reclassifications (296) 159 (99) 171
Benefit plan net (loss) gain and prior service (cost) credit, net of amortization (13) 0 (28) (75)
Cumulative translation adjustment 299 (175) (83) (244)
Other comprehensive income (loss), net of taxes (10) (16) (210) (148)
Comprehensive Income Attributable to Merck & Co., Inc. $ 3,147 $ 4,729 $ 13,164 $ 1,443