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Consolidated Statements of Changes in Equity - USD ($) shares in Millions, $ in Millions | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Net Unrealized (Losses) Gains on Investments [Member] | Foreign Currency Translation Losses [Member] | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 49,833 | $ 10 | $ 1,703 | $ 48,730 | $ (13) | $ (2,654) | $ 2,057
Balance (Accounting Standards Update 2016-01) at Dec. 31, 2017 | 0 |  |  | (24) | 24 |  |
Balance (in shares) at Dec. 31, 2017 |  | 969 |  |  |  |  |
Net earnings attributable to UnitedHealth Group common shareholders | 11,986 |  |  | 11,986 |  |  |
Net earnings attributable to nonredeemable noncontrolling interest |  |  |  |  |  |  | 273
Net earnings, Including Portion Attributable to Nonredeemable Noncontrolling Interest | 12,259 |  |  |  |  |  |
Other comprehensive income (loss) | (1,517) |  |  |  | (275) | (1,242) |
Issuances of common stock, and related tax effects (in shares) |  | 10 |  |  |  |  |
Issuances of common stock, and related tax effects | 814 | $ 0 | 814 |  |  |  |
Share-based compensation | 620 |  | 620 |  |  |  |
Common share repurchases (in shares) |  | (19) |  |  |  |  |
Common share repurchases | (4,500) | $ 0 | (2,974) | (1,526) |  |  |
Cash dividends paid on common shares ($4.83 per share, $4.14 per share and $3.45 per share for the years ended December 31, 2020, 2019 and 2018, respectively) | (3,320) |  |  | (3,320) |  |  |
Redeemable noncontrolling interests fair value and other adjustments | (163) |  | (163) |  |  |  |
Acquisition and other adjustments of nonredeemable noncontrolling interests | 521 |  |  |  |  |  | 521
Distributions to nonredeemable noncontrolling interests | (228) |  |  |  |  |  | (228)
Balance at Dec. 31, 2018 | 54,319 | $ 10 | 0 | 55,846 | (264) | (3,896) | 2,623
Balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018 | (18) |  |  | (13) |  |  | (5)
Balance (in shares) at Dec. 31, 2018 |  | 960 |  |  |  |  |
Net earnings attributable to UnitedHealth Group common shareholders | 13,839 |  |  | 13,839 |  |  |
Net earnings attributable to nonredeemable noncontrolling interest |  |  |  |  |  |  | 285
Net earnings, Including Portion Attributable to Nonredeemable Noncontrolling Interest | 14,124 |  |  |  |  |  |
Other comprehensive income (loss) | 582 |  |  |  | 853 | (271) |
Issuances of common stock, and related tax effects (in shares) |  | 10 |  |  |  |  |
Issuances of common stock, and related tax effects | 696 | $ 0 | 696 |  |  |  |
Share-based compensation | $ 673 |  | 673 |  |  |  |
Common share repurchases (in shares) | (22) | (22) |  |  |  |  |
Common share repurchases | $ (5,500) | $ (1) | (937) | (4,562) |  |  |
Cash dividends paid on common shares ($4.83 per share, $4.14 per share and $3.45 per share for the years ended December 31, 2020, 2019 and 2018, respectively) | (3,932) |  |  | (3,932) |  |  |
Redeemable noncontrolling interests fair value and other adjustments | (316) |  | (316) |  |  |  |
Acquisition and other adjustments of nonredeemable noncontrolling interests | 87 |  | (109) |  |  |  | 196
Distributions to nonredeemable noncontrolling interests | (279) |  |  |  |  |  | (279)
Balance at Dec. 31, 2019 | 60,436 | $ 9 | 7 | 61,178 | 589 | (4,167) | 2,820
Balance (Accounting Standards Update 2016-13) at Dec. 31, 2019 | $ (28) |  |  | (28) |  |  |
Balance (in shares) at Dec. 31, 2019 | 948 | 948 |  |  |  |  |
Net earnings attributable to UnitedHealth Group common shareholders | $ 15,403 |  |  | 15,403 |  |  |
Net earnings attributable to nonredeemable noncontrolling interest |  |  |  |  |  |  | 254
Net earnings, Including Portion Attributable to Nonredeemable Noncontrolling Interest | 15,657 |  |  |  |  |  |
Other comprehensive income (loss) | (236) |  |  |  | 747 | (983) |
Issuances of common stock, and related tax effects (in shares) |  | 12 |  |  |  |  |
Issuances of common stock, and related tax effects | 1,120 | $ 1 | 1,119 |  |  |  |
Share-based compensation | $ 647 |  | 647 |  |  |  |
Common share repurchases (in shares) | (14) | (14) |  |  |  |  |
Common share repurchases | $ (4,250) | $ 0 | (1,576) | (2,674) |  |  |
Cash dividends paid on common shares ($4.83 per share, $4.14 per share and $3.45 per share for the years ended December 31, 2020, 2019 and 2018, respectively) | (4,584) |  |  | (4,584) |  |  |
Redeemable noncontrolling interests fair value and other adjustments | (197) |  | (197) |  |  |  |
Acquisition and other adjustments of nonredeemable noncontrolling interests | 40 |  |  |  |  |  | 40
Distributions to nonredeemable noncontrolling interests | (277) |  |  |  |  |  | (277)
Balance at Dec. 31, 2020 | $ 68,328 | $ 10 | $ 0 | $ 69,295 | $ 1,336 | $ (5,150) | $ 2,837
Balance (in shares) at Dec. 31, 2020 | 946 | 946 |  |  |  |  |

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