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v3.19.2

Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Shares, beginning balance (in shares) |  |  | 3,577,103,522 |  |
Equity, beginning balance | $ 27,670 | $ 33,901 | $ 26,882 | $ 34,569 |
Net income attributable to Merck & Co., Inc. | 2,670 | 1,707 | 5,585 | 2,443 |
Adoption of new accounting standards |  |  |  |  | $ 48
Other comprehensive income (loss), net of taxes | (16) | (62) | 183 | 62 |
Cash dividends declared on common stock | (1,440) | (1,291) | (2,869) | (2,592) |
Treasury stock shares purchased | (1,235) | (1,596) | (2,325) | (2,162) |
Share-based compensation plans and other | 117 | 103 | 360 | 394 |
Net income (loss) attributable to noncontrolling interests | (26) | 9 | $ (79) | 14 |
Distributions attributable to noncontrolling interests |  | (5) |  | (10) |
Other changes in noncontrolling ownership interests | $ (3) |  |  |  |
Shares, ending balance (in shares) | 3,577,103,522 |  | 3,577,103,522 |  |
Equity, ending balance | $ 27,737 | $ 32,766 | $ 27,737 | $ 32,766 |
Cash dividends declared on common stock (in dollars per share) | $ 0.55 | $ 0.48 | $ 1.10 | $ 0.96 |
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 | 38,768 | 39,874 | 38,808 | 39,902 |
Treasury stock shares purchased | 1,000 |  | 1,000 |  |
Share-based compensation plans and other | (284) | (133) | (324) | (161) |
Equity, ending balance | 39,484 | 39,741 | 39,484 | 39,741 |
Retained Earnings |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Equity, beginning balance | 44,065 | 41,107 | 42,579 | 41,350 |
Net income attributable to Merck & Co., Inc. | 2,670 | 1,707 | 5,585 | 2,443 |
Adoption of new accounting standards |  |  |  |  | 322
Cash dividends declared on common stock | (1,440) | (1,291) | (2,869) | (2,592) |
Equity, ending balance | 45,295 | 41,523 | 45,295 | 41,523 |
Accumulated Other Comprehensive Loss |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Equity, beginning balance | (5,346) | (5,060) | (5,545) | (4,910) |
Adoption of new accounting standards |  |  |  |  | $ (274)
Other comprehensive income (loss), net of taxes | (16) | (62) | 183 | 62 |
Equity, ending balance | $ (5,362) | $ (5,122) | $ (5,362) | $ (5,122) |
Treasury Stock |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Shares, beginning balance (in shares) | 994,000,000 | 885,000,000 | 985,000,000 | 880,000,000 |
Equity, beginning balance | $ (51,736) | $ (44,041) | $ (50,929) | $ (43,794) |
Treasury stock shares purchased (in shares) | 24,000,000 | 27,000,000 | 38,000,000 | 37,000,000 |
Treasury stock shares purchased | $ (2,235) | $ (1,596) | $ (3,325) | $ (2,162) |
Share-based compensation plans and other (in shares) | (8,000,000) | (5,000,000) | (13,000,000) | (10,000,000) |
Share-based compensation plans and other | $ 401 | $ 236 | $ 684 | $ 555 |
Shares, ending balance (in shares) | 1,010,000,000 | 907,000,000 | 1,010,000,000 | 907,000,000 |
Equity, ending balance | $ (53,570) | $ (45,401) | $ (53,570) | $ (45,401) |
Non- Controlling Interests |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Equity, beginning balance | 131 | 233 | 181 | 233 |
Net income (loss) attributable to noncontrolling interests | (26) | 9 | (79) | 14 |
Distributions attributable to noncontrolling interests |  | (5) |  | (10) |
Other changes in noncontrolling ownership interests | (3) |  |  |  |
Equity, ending balance | $ 102 | $ 237 | $ 102 | $ 237 |

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