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v3.21.1

Equity - Rollforward Reconciliations (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Shares, beginning balance (in shares) | 3,577,103,522 |
Equity, beginning balance | $ 25,404 | $ 26,001
Net income attributable to Merck & Co., Inc. | 3,179 | 3,219
Other comprehensive income (loss), net of taxes | 12 | (198)
Cash dividends declared on common stock | (1,653) | (1,549)
Treasury stock shares purchased |  | (1,281)
Share-based compensation plans and other | 90 | 107
Other changes in noncontrolling interests |  | 1
Net income (loss) attributable to noncontrolling interests | $ 7 | 0
Shares, ending balance (in shares) | 3,577,103,522 |
Equity, ending balance | $ 27,039 | $ 26,300
Cash dividends declared on common stock (in dollars per share) | $ 0.65 | $ 0.61
Common Stock |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Shares, beginning balance (in shares) | 3,577,000,000 | 3,577,000,000
Equity, beginning balance | $ 1,788 | $ 1,788
Shares, ending balance (in shares) | 3,577,000,000 | 3,577,000,000
Equity, ending balance | $ 1,788 | $ 1,788
Other Paid-In Capital |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Equity, beginning balance | 39,588 | 39,660
Share-based compensation plans and other | 25 | 37
Equity, ending balance | 39,613 | 39,697
Retained Earnings |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Equity, beginning balance | 47,362 | 46,602
Net income attributable to Merck & Co., Inc. | 3,179 | 3,219
Cash dividends declared on common stock | (1,653) | (1,549)
Equity, ending balance | 48,888 | 48,272
Accumulated Other Comprehensive Loss |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Equity, beginning balance | (6,634) | (6,193)
Other comprehensive income (loss), net of taxes | 12 | (198)
Equity, ending balance | $ (6,622) | $ (6,391)
Treasury Stock |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Shares, beginning balance (in shares) | 1,047,000,000 | 1,038,000,000
Equity, beginning balance | $ (56,787) | $ (55,950)
Treasury stock shares purchased (in shares) |  | 16,000,000
Treasury stock shares purchased |  | $ (1,281)
Share-based compensation plans and other (in shares) | (1,000,000) | (1,000,000)
Share-based compensation plans and other | $ 65 | $ 70
Shares, ending balance (in shares) | 1,046,000,000 | 1,053,000,000
Equity, ending balance | $ (56,722) | $ (57,161)
Non- controlling Interests |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Equity, beginning balance | 87 | 94
Other changes in noncontrolling interests |  | 1
Net income (loss) attributable to noncontrolling interests | 7 |
Equity, ending balance | $ 94 | $ 95

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