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Equity - Rollforward Reconciliations (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Shares, beginning balance (in shares) |  |  | 3,577,103,522 |
Equity, beginning balance | $ 26,300 | $ 27,670 | $ 26,001 | $ 26,882
Net income attributable to Merck & Co., Inc. | 3,002 | 2,670 | 6,221 | 5,585
Other comprehensive income (loss), net of taxes | (2) | (16) | (200) | 183
Cash dividends declared on common stock | (1,550) | (1,440) | (3,099) | (2,869)
Treasury stock shares purchased |  | (1,235) | (1,281) | (2,325)
Share-based compensation plans and other | (13) | 117 | 94 | 360
Net income (loss) attributable to noncontrolling interests | 8 | (26) | $ 8 | (79)
Noncontrolling interest, changes in ownership interest, other |  | (3) |  |
Distributions attributable to noncontrolling interests | $ (1) |  |  |
Shares, ending balance (in shares) | 3,577,103,522 |  | 3,577,103,522 |
Equity, ending balance | $ 27,744 | $ 27,737 | $ 27,744 | $ 27,737
Cash dividends declared on common stock (in dollars per share) | $ 0.61 | $ 0.55 | $ 1.22 | $ 1.10
Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Shares, beginning balance (in shares) | 3,577,000,000 | 3,577,000,000 | 3,577,000,000 | 3,577,000,000
Equity, beginning balance | $ 1,788 | $ 1,788 | $ 1,788 | $ 1,788
Shares, ending balance (in shares) | 3,577,000,000 | 3,577,000,000 | 3,577,000,000 | 3,577,000,000
Equity, ending balance | $ 1,788 | $ 1,788 | $ 1,788 | $ 1,788
Other Paid-In Capital |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Equity, beginning balance | 39,697 | 38,768 | 39,660 | 38,808
Treasury stock shares purchased |  | 1,000 |  | 1,000
Share-based compensation plans and other | (324) | (284) | (287) | (324)
Equity, ending balance | 39,373 | 39,484 | 39,373 | 39,484
Retained Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Equity, beginning balance | 48,272 | 44,065 | 46,602 | 42,579
Net income attributable to Merck & Co., Inc. | 3,002 | 2,670 | 6,221 | 5,585
Cash dividends declared on common stock | (1,550) | (1,440) | (3,099) | (2,869)
Equity, ending balance | 49,724 | 45,295 | 49,724 | 45,295
Accumulated Other Comprehensive Loss |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Equity, beginning balance | (6,391) | (5,346) | (6,193) | (5,545)
Other comprehensive income (loss), net of taxes | (2) | (16) | (200) | 183
Equity, ending balance | $ (6,393) | $ (5,362) | $ (6,393) | $ (5,362)
Treasury Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Shares, beginning balance (in shares) | 1,053,000,000 | 994,000,000 | 1,038,000,000 | 985,000,000
Equity, beginning balance | $ (57,161) | $ (51,736) | $ (55,950) | $ (50,929)
Treasury stock shares purchased (in shares) |  | 24,000,000 | 16,000,000 | 38,000,000
Treasury stock shares purchased |  | $ (2,235) | $ (1,281) | $ (3,325)
Share-based compensation plans and other (in shares) | (5,000,000) | (8,000,000) | (6,000,000) | (13,000,000)
Share-based compensation plans and other | $ 311 | $ 401 | $ 381 | $ 684
Shares, ending balance (in shares) | 1,048,000,000 | 1,010,000,000 | 1,048,000,000 | 1,010,000,000
Equity, ending balance | $ (56,850) | $ (53,570) | $ (56,850) | $ (53,570)
Non- controlling Interests |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Equity, beginning balance | 95 | 131 | 94 | 181
Net income (loss) attributable to noncontrolling interests | 8 | (26) | 8 | (79)
Noncontrolling interest, changes in ownership interest, other |  | (3) |  |
Distributions attributable to noncontrolling interests | (1) |  |  |
Equity, ending balance | $ 102 | $ 102 | $ 102 | $ 102

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