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Equity | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Equity | Equity
| Three Months Ended March 31,
| Common Stock | Other Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Treasury Stock | Non- controlling Interests | Total
($ and shares in millions except per share amounts) | Shares | Par Value | Shares | Cost
Balance at January 1, 2020 | 3,577 |  | $ | 1,788 |  | $ | 39,660 |  | $ | 46,602 |  | $ | (6,193) |  | 1,038 |  | $ | (55,950) |  | $ | 94 |  | $ | 26,001 |
Net income attributable to Merck & Co., Inc. | — |  | — |  | — |  | 3,219 |  | — |  | — |  | — |  | — |  | 3,219 |
Other comprehensive loss, net of taxes | — |  | — |  | — |  | — |  | (198) |  | — |  | — |  | — |  | (198) |
Cash dividends declared on common stock ($0.61 per share) | — |  | — |  | — |  | (1,549) |  | — |  | — |  | — |  | — |  | (1,549) |
Treasury stock shares purchased | — |  | — |  | — |  | — |  | — |  | 16 |  | (1,281) |  | — |  | (1,281) |
Share-based compensation plans and other | — |  | — |  | 37 |  | — |  | — |  | (1) |  | 70 |  | — |  | 107 |
Other changes in noncontrolling interests | — |  | — |  | — |  | — |  | — |  | — |  | — |  | 1 |  | 1 |
Balance at March 31, 2020 | 3,577 |  | $ | 1,788 |  | $ | 39,697 |  | $ | 48,272 |  | $ | (6,391) |  | 1,053 |  | $ | (57,161) |  | $ | 95 |  | $ | 26,300 |
Balance at January 1, 2021 | 3,577 |  | $ | 1,788 |  | $ | 39,588 |  | $ | 47,362 |  | $ | (6,634) |  | 1,047 |  | $ | (56,787) |  | $ | 87 |  | $ | 25,404 |
Net income attributable to Merck & Co., Inc. | — |  | — |  | — |  | 3,179 |  | — |  | — |  | — |  | — |  | 3,179 |
Other comprehensive income, net of taxes | — |  | — |  | — |  | — |  | 12 |  | — |  | — |  | — |  | 12 |
Cash dividends declared on common stock ($0.65 per share) | — |  | — |  | — |  | (1,653) |  | — |  | — |  | — |  | — |  | (1,653) |
Share-based compensation plans and other | — |  | — |  | 25 |  | — |  | — |  | (1) |  | 65 |  | — |  | 90 |
Net income attributable to noncontrolling interests | — |  | — |  | — |  | — |  | — |  | — |  | — |  | 7 |  | 7 |
Balance at March 31, 2021 | 3,577 |  | $ | 1,788 |  | $ | 39,613 |  | $ | 48,888 |  | $ | (6,622) |  | 1,046 |  | $ | (56,722) |  | $ | 94 |  | $ | 27,039 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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