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v3.21.2

Equity - Rollforward Reconciliations (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 02, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Shares, beginning balance (in shares) |  |  |  | 3,577,103,522 |
Equity, beginning balance |  | $ 33,388 | $ 27,744 | $ 25,404 | $ 26,001
Net income (loss) attributable to Merck & Co., Inc. |  | 4,567 | 2,941 | 9,291 | 9,161
Other comprehensive income (loss), net of taxes |  | 38 | 10 | 1,595 | (190)
Cash dividends declared on common stock |  | (1,653) | (1,558) | (4,962) | (4,656)
Treasury stock shares purchased |  | (583) |  | (822) | (1,281)
Spin-off of Organon & Co. |  |  |  | 5,091 |
Share-based compensation plans and other |  | 131 | 151 | 283 | 245
Net income attributable to noncontrolling interests |  | 4 | 4 | 12 | 12
Distributions attributable to noncontrolling interests |  | $ (29) | (22) | $ (29) | (22)
Shares, ending balance (in shares) |  | 3,577,103,522 |  | 3,577,103,522 |
Equity, ending balance |  | $ 35,863 | $ 29,270 | $ 35,863 | $ 29,270
Cash dividends declared on common stock (in dollars per share) |  | $ 0.65 | $ 0.61 | $ 1.95 | $ 1.83
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 |  | 44,039 | 39,373 | 39,588 | 39,660
Spin-off of Organon & Co. | $ 4,600 |  |  | 4,643 |
Share-based compensation plans and other |  | 110 | 116 | (82) | (171)
Equity, ending balance |  | 44,149 | 39,489 | 44,149 | 39,489
Retained Earnings |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Equity, beginning balance |  | 48,777 | 49,724 | 47,362 | 46,602
Net income (loss) attributable to Merck & Co., Inc. |  | 4,567 | 2,941 | 9,291 | 9,161
Cash dividends declared on common stock |  | (1,653) | (1,558) | (4,962) | (4,656)
Equity, ending balance |  | 51,691 | 51,107 | 51,691 | 51,107
Accumulated Other Comprehensive Loss |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Equity, beginning balance |  | (4,628) | (6,393) | (6,634) | (6,193)
Other comprehensive income (loss), net of taxes |  | 38 | 10 | 1,595 | (190)
Spin-off of Organon & Co. | $ 449 |  |  | 449 |
Equity, ending balance |  | $ (4,590) | $ (6,383) | $ (4,590) | $ (6,383)
Treasury Stock |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Shares, beginning balance (in shares) |  | 1,044,000,000 | 1,048,000,000 | 1,047,000,000 | 1,038,000,000
Equity, beginning balance |  | $ (56,682) | $ (56,850) | $ (56,787) | $ (55,950)
Treasury stock shares purchased (in shares) |  | 8,000,000 |  | 11,000,000 | 16,000,000
Treasury stock shares purchased |  | $ (583) |  | $ (822) | $ (1,281)
Share-based compensation plans and other (in shares) |  |  | (1,000,000) | (6,000,000) | (7,000,000)
Share-based compensation plans and other |  | $ 21 | $ 35 | $ 365 | $ 416
Shares, ending balance (in shares) |  | 1,052,000,000 | 1,047,000,000 | 1,052,000,000 | 1,047,000,000
Equity, ending balance |  | $ (57,244) | $ (56,815) | $ (57,244) | $ (56,815)
Non- controlling Interests |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Equity, beginning balance |  | 94 | 102 | 87 | 94
Spin-off of Organon & Co. |  |  |  | (1) |
Net income attributable to noncontrolling interests |  | 4 | 4 | 12 | 12
Distributions attributable to noncontrolling interests |  | (29) | (22) | (29) | (22)
Equity, ending balance |  | $ 69 | $ 84 | $ 69 | $ 84

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