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v3.19.1

Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Shares, beginning balance (in shares) | 3,577,103,522 |  |
Equity, beginning balance | $ 26,882 | $ 34,569 |
Net income attributable to Merck & Co., Inc. | 2,915 | 736 |
Adoption of new accounting standards |  |  | $ 48
Other comprehensive income, net of taxes | 199 | 124 |
Cash dividends declared on common stock | (1,429) | (1,301) |
Treasury stock shares purchased | (1,090) | (566) |
Share-based compensation plans and other | 243 | 291 |
Net income attributable to noncontrolling interests | (53) | 5 |
Distributions attributable to noncontrolling interests |  | (5) |
Other changes in noncontrolling ownership interests | $ 3 |  |
Shares, ending balance (in shares) | 3,577,103,522 |  |
Equity, ending balance | $ 27,670 | $ 33,901 |
Cash dividends declared on common stock (in dollars per share) | $ 0.55 | $ 0.48 |
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 | 38,808 | 39,902 |
Share-based compensation plans and other | (40) | (28) |
Equity, ending balance | 38,768 | 39,874 |
Retained Earnings |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Equity, beginning balance | 42,579 | 41,350 |
Net income attributable to Merck & Co., Inc. | 2,915 | 736 |
Adoption of new accounting standards |  |  | 322
Cash dividends declared on common stock | (1,429) | (1,301) |
Equity, ending balance | 44,065 | 41,107 |
Accumulated Other Comprehensive Loss |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Equity, beginning balance | (5,545) | (4,910) |
Adoption of new accounting standards |  |  | $ (274)
Other comprehensive income, net of taxes | 199 | 124 |
Equity, ending balance | $ (5,346) | $ (5,060) |
Treasury Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Shares, beginning balance (in shares) | 985,000,000 | 880,000,000 |
Equity, beginning balance | $ (50,929) | $ (43,794) |
Treasury stock shares purchased (in shares) | 14,000,000 | 10,000,000 |
Treasury stock shares purchased | $ (1,090) | $ (566) |
Share-based compensation plans and other (in shares) | (5,000,000) | (5,000,000) |
Share-based compensation plans and other | $ 283 | $ 319 |
Shares, ending balance (in shares) | 994,000,000 | 885,000,000 |
Equity, ending balance | $ (51,736) | $ (44,041) |
Non- Controlling Interests |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Equity, beginning balance | 181 | 233 |
Net income attributable to noncontrolling interests | (53) | 5 |
Distributions attributable to noncontrolling interests |  | (5) |
Other changes in noncontrolling ownership interests | 3 |  |
Equity, ending balance | $ 131 | $ 233 |

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