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Consolidated Statement of Equity - USD ($) $ in Millions | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock | Other Paid-In Capital | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss Cumulative Effect, Period of Adoption, Adjustment | Treasury Stock | Non- controlling Interests
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2017 | $ 34,569 | $ 48 | $ 1,788 | $ 39,902 | $ 41,350 | $ 322 | $ (4,910) | $ (274) | $ (43,794) | $ 233
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income Attributable to Merck & Co., Inc. | 6,220 |  |  |  | 6,220 |  |  |  |  |
Other comprehensive income (loss), net of taxes | (361) |  |  |  |  |  | (361) |  |  |
Cash dividends declared on common stock ($2.48 in 2020, $2.26 per share in 2019 and $1.99 per share in 2018) | (5,313) |  |  |  | (5,313) |  |  |  |  |
Treasury stock shares purchased | (9,091) |  |  | (1,000) |  |  |  |  | (8,091) |
Net income (loss) attributable to noncontrolling interests | (27) |  |  |  |  |  |  |  |  | (27)
Distributions attributable to noncontrolling interests | (25) |  |  |  |  |  |  |  |  | (25)
Share-based compensation plans and other | 862 |  |  | (94) |  |  |  |  | 956 |
Ending Balance at Dec. 31, 2018 | 26,882 |  | 1,788 | 38,808 | 42,579 |  | (5,545) |  | (50,929) | 181
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income Attributable to Merck & Co., Inc. | 9,843 |  |  |  | 9,843 |  |  |  |  |
Other comprehensive income (loss), net of taxes | (648) |  |  |  |  |  | (648) |  |  |
Cash dividends declared on common stock ($2.48 in 2020, $2.26 per share in 2019 and $1.99 per share in 2018) | (5,820) |  |  |  | (5,820) |  |  |  |  |
Treasury stock shares purchased | (4,780) |  |  | (1,000) |  |  |  |  | (5,780) |
Net income (loss) attributable to noncontrolling interests | (66) |  |  |  |  |  |  |  |  | (66)
Distributions attributable to noncontrolling interests | (21) |  |  |  |  |  |  |  |  | (21)
Share-based compensation plans and other | 611 |  |  | (148) |  |  |  |  | 759 |
Ending Balance at Dec. 31, 2019 | 26,001 |  | 1,788 | 39,660 | 46,602 |  | (6,193) |  | (55,950) | 94
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income Attributable to Merck & Co., Inc. | 7,067 |  |  |  | 7,067 |  |  |  |  |
Other comprehensive income (loss), net of taxes | (441) |  |  |  |  |  | (441) |  |  |
Cash dividends declared on common stock ($2.48 in 2020, $2.26 per share in 2019 and $1.99 per share in 2018) | (6,307) |  |  |  | (6,307) |  |  |  |  |
Treasury stock shares purchased | (1,281) |  |  |  |  |  |  |  | (1,281) |
Net income (loss) attributable to noncontrolling interests | 15 |  |  |  |  |  |  |  |  | 15
Distributions attributable to noncontrolling interests | (22) |  |  |  |  |  |  |  |  | (22)
Share-based compensation plans and other | 372 |  |  | (72) |  |  |  |  | 444 |
Ending Balance at Dec. 31, 2020 | $ 25,404 |  | $ 1,788 | $ 39,588 | $ 47,362 |  | $ (6,634) |  | $ (56,787) | $ 87

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