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Equity | 3 Months Ended
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Mar. 31, 2017
Equity [Abstract] |
Equity | 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. | — |  | — |  | — |  | 1,125 |  | — |  | — |  | — |  | — |  | 1,125 |
Other comprehensive loss, net of tax | — |  | — |  | — |  | — |  | (46 | ) | — |  | — |  | — |  | (46 | )
Cash dividends declared on common stock | — |  | — |  | — |  | (1,281 | ) | — |  | — |  | — |  | — |  | (1,281 | )
Treasury stock shares purchased | — |  | — |  | — |  | — |  | — |  | 18 |  | (913 | ) | — |  | (913 | )
Share-based compensation plans and other | — |  | — |  | (77 | ) | — |  | — |  | (6 | ) | 322 |  | — |  | 245 |
Net income attributable to noncontrolling interests | — |  | — |  | — |  | — |  | — |  | — |  | — |  | 5 |  | 5 |
Distributions attributable to noncontrolling interests | — |  | — |  | — |  | — |  | — |  | — |  | — |  | (1 | ) | (1 | )
Balance at March 31, 2016 | 3,577 |  | $ | 1,788 |  | $ | 40,145 |  | $ | 45,192 |  | $ | (4,194 | ) | 808 |  | $ | (39,125 | ) | $ | 95 |  | $ | 43,901 |
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. | — |  | — |  | — |  | 1,551 |  | — |  | — |  | — |  | — |  | 1,551 |
Other comprehensive income, net of tax | — |  | — |  | — |  | — |  | 146 |  | — |  | — |  | — |  | 146 |
Cash dividends declared on common stock | — |  | — |  | — |  | (1,297 | ) | — |  | — |  | — |  | — |  | (1,297 | )
Treasury stock shares purchased | — |  | — |  | — |  | — |  | — |  | 16 |  | (1,019 | ) | — |  | (1,019 | )
Share-based compensation plans and other | — |  | — |  | (40 | ) | — |  | — |  | (7 | ) | 408 |  | — |  | 368 |
Acquisition of Vallée | — |  | — |  | — |  | — |  | — |  | — |  | — |  | 25 |  | 25 |
Net income attributable to noncontrolling interests | — |  | — |  | — |  | — |  | — |  | — |  | — |  | 5 |  | 5 |
Other changes in noncontrolling ownership interests | — |  | — |  | — |  | — |  | — |  | — |  | — |  | 1 |  | 1 |
Balance at March 31, 2017 | 3,577 |  | $ | 1,788 |  | $ | 39,899 |  | $ | 44,387 |  | $ | (5,080 | ) | 837 |  | $ | (41,157 | ) | $ | 251 |  | $ | 40,088 |

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preferred Stock -URI http://asc.fasb.org/extlink&oid=6521494 Reference 15: 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=6928386&loc=d3e21463-112644 Reference 16: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 + Details
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