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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net Income Attributable to Merck & Co., Inc. $ 5,785 $ 3,157 $ 15,291 $ 13,374
Other Comprehensive Income (Loss) Net of Taxes:        
Net unrealized gain (loss) on derivatives, net of reclassifications 170 (296) (457) (99)
Benefit plan net gain (loss) and prior service credit (cost), net of amortization 74 (13) 48 (28)
Cumulative translation adjustment (25) 299 152 (83)
Other comprehensive income (loss), net of taxes 219 (10) (257) (210)
Comprehensive Income Attributable to Merck & Co., Inc. $ 6,004 $ 3,147 $ 15,034 $ 13,164