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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