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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net earnings $ 4,978 $ 3,465
Other comprehensive loss:    
Gross unrealized losses on investment securities during the period (764) (349)
Income tax effect 174 80
Total unrealized losses, net of tax (590) (269)
Gross reclassification adjustment for net realized gains included in net earnings (7) (18)
Income tax effect 2 4
Total reclassification adjustment, net of tax (5) (14)
Total foreign currency translation losses (417) (1,499)
Other comprehensive loss (1,012) (1,782)
Comprehensive income 3,966 1,683
Comprehensive income attributable to noncontrolling interests (116) (83)
Comprehensive income attributable to UnitedHealth Group common shareholders $ 3,850 $ 1,600