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Equity (Tables) | 9 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Equity |
| Common Stock | Other Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Treasury Stock | Non- Controlling Interests | Total
($ and shares in millions) | Shares | Par Value | Shares | Cost
Balance at January 1, 2016 | 3,577 |  | $ | 1,788 |  | $ | 40,222 |  | $ | 45,348 |  | $ | (4,148 | ) | 796 |  | $ | (38,534 | ) | $ | 91 |  | $ | 44,767 |
Net income attributable to Merck & Co., Inc. | — |  | — |  | — |  | 4,515 |  | — |  | — |  | — |  | — |  | 4,515 |
Other comprehensive loss, net of taxes | — |  | — |  | — |  | — |  | (104 | ) | — |  | — |  | — |  | (104 | )
Cash dividends declared on common stock | — |  | — |  | — |  | (3,835 | ) | — |  | — |  | — |  | — |  | (3,835 | )
Treasury stock shares purchased | — |  | — |  | — |  | — |  | — |  | 44 |  | (2,418 | ) | — |  | (2,418 | )
Share-based compensation plans and other | — |  | — |  | (325 | ) | — |  | — |  | (25 | ) | 1,235 |  | — |  | 910 |
Changes in noncontrolling ownership interests | — |  | — |  | — |  | — |  | — |  | — |  | — |  | 124 |  | 124 |
Net income attributable to noncontrolling interests | — |  | — |  | — |  | — |  | — |  | — |  | — |  | 13 |  | 13 |
Distributions attributable to noncontrolling interests | — |  | — |  | — |  | — |  | — |  | — |  | — |  | (15 | ) | (15 | )
Balance at September 30, 2016 | 3,577 |  | $ | 1,788 |  | $ | 39,897 |  | $ | 46,028 |  | $ | (4,252 | ) | 815 |  | $ | (39,717 | ) | $ | 213 |  | $ | 43,957 |
Balance at January 1, 2017 | 3,577 |  | $ | 1,788 |  | $ | 39,939 |  | $ | 44,133 |  | $ | (5,226 | ) | 828 |  | $ | (40,546 | ) | $ | 220 |  | $ | 40,308 |
Net income attributable to Merck & Co., Inc. | — |  | — |  | — |  | 3,440 |  | — |  | — |  | — |  | — |  | 3,440 |
Other comprehensive income, net of taxes | — |  | — |  | — |  | — |  | 281 |  | — |  | — |  | — |  | 281 |
Cash dividends declared on common stock | — |  | — |  | — |  | (3,872 | ) | — |  | — |  | — |  | — |  | (3,872 | )
Treasury stock shares purchased | — |  | — |  | — |  | — |  | — |  | 36 |  | (2,312 | ) | — |  | (2,312 | )
Share-based compensation plans and other | — |  | — |  | (116 | ) | — |  | — |  | (13 | ) | 739 |  | — |  | 623 |
Acquisition of Vallée | — |  | — |  | — |  | — |  | — |  | — |  | — |  | 25 |  | 25 |
Net income attributable to noncontrolling interests | — |  | — |  | — |  | — |  | — |  | — |  | — |  | 16 |  | 16 |
Distributions attributable to noncontrolling interests | — |  | — |  | — |  | — |  | — |  | — |  | — |  | (10 | ) | (10 | )
Balance at September 30, 2017 | 3,577 |  | 1,788 |  | 39,823 |  | 43,701 |  | (4,945 | ) | 851 |  | (42,119 | ) | 251 |  | 38,499 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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