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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 39 $ (6,174) $ 882 $ (5,053)
Other comprehensive income (loss), net of tax        
Foreign currency translation adjustments 16 107 (8) 181
Unrealized gains (losses) on cash flow hedges (6) (12) 2 (36)
Changes in retirement-related benefit plans (2) 24 2 16
Other comprehensive income (loss), net of tax 8 119 (4) 161
Comprehensive income (loss) 47 (6,055) 878 (4,892)
Comprehensive income attributable to noncontrolling interests (44) (77) (137) (113)
Comprehensive income (loss) attributable to McKesson Corporation $ 3 $ (6,132) $ 741 $ (5,005)