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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]      
Net Income Attributable to Merck & Co., Inc. $ 13,049 $ 7,067 $ 9,843
Other Comprehensive Income (Loss) Net of Taxes:      
Net unrealized gain (loss) on derivatives, net of reclassifications 410 (297) (135)
Net unrealized (loss) gain on investments, net of reclassifications 0 (18) 96
Benefit plan net gain (loss) and prior service credit (cost), net of amortization 1,769 (279) (705)
Cumulative translation adjustment (423) 153 96
Other comprehensive income (loss), net of taxes 1,756 (441) (648)
Comprehensive Income Attributable to Merck & Co., Inc. $ 14,805 $ 6,626 $ 9,195