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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net Income Attributable to Merck & Co., Inc. $ 4,427 $ 5,455 $ 9,506 $ 10,217
Other Comprehensive Loss Net of Taxes:        
Net unrealized (loss) gain on derivatives, net of reclassifications (410) 67 (627) 197
Benefit plan net loss and prior service cost, net of amortization (8) (10) (26) (15)
Cumulative translation adjustment (38) (144) 177 (382)
Other comprehensive income (loss), net of taxes (456) (87) (476) (200)
Comprehensive Income Attributable to Merck & Co., Inc. $ 3,971 $ 5,368 $ 9,030 $ 10,017