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Stockholders' Equity (Deficit) - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ (1,472) $ (45) $ (1,792) $ 175
Other comprehensive income (loss), net of tax (172) (38) 464 (12)
Other comprehensive income (loss) attributable to McKesson (172) (38) 464 (15)
Exercise of put right by noncontrolling shareholders of McKesson Europe AG       8
Ending balance (1,249) (87) (1,249) (87)
Derivatives designated for hedge accounting | Net Investment Hedging | Euro Denominated Notes        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Other comprehensive income (loss), net investment hedge, gain (loss) 75 33 139 11
Derivatives designated for hedge accounting | Cross-currency swaps        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Other comprehensive income (loss), net investment hedge, gain (loss) 21 10 33 5
Total Accumulated Other Comprehensive Loss        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (948) (1,627) (1,534) (1,480)
Other comprehensive income (loss) before reclassifications (189) (45) (290) (33)
Amounts reclassified to earnings and other 17 7 754 21
Other comprehensive income (loss), net of tax (172) (38) 464 (12)
Less: amounts attributable to noncontrolling interests (6) 0 44 3
Other comprehensive income (loss) attributable to McKesson (166) (38) 420 (15)
Exercise of put right by noncontrolling shareholders of McKesson Europe AG       (170)
Ending balance (1,114) (1,665) (1,114) (1,665)
Foreign Currency Translation Adjustments, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (997) (1,477) (1,504) (1,361)
Other comprehensive income (loss) before reclassifications (280) (81) (456) (47)
Amounts reclassified to earnings and other 17 1 747 18
Other comprehensive income (loss), net of tax (263) (80) 291 (29)
Less: amounts attributable to noncontrolling interests (6) 0 41 9
Other comprehensive income (loss) attributable to McKesson (257) (80) 250 (38)
Exercise of put right by noncontrolling shareholders of McKesson Europe AG       (158)
Ending balance (1,254) (1,557) (1,254) (1,557)
Unrealized Gains on Net Investment Hedges, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 38 (57) 10 (36)
Other comprehensive income (loss) before reclassifications 71 32 116 5
Amounts reclassified to earnings and other 0 0 (17) 0
Other comprehensive income (loss), net of tax 71 32 99 5
Less: amounts attributable to noncontrolling interests 0 0 0 (6)
Other comprehensive income (loss) attributable to McKesson 71 32 99 11
Exercise of put right by noncontrolling shareholders of McKesson Europe AG       0
Ending balance 109 (25) 109 (25)
Other comprehensive income (loss) before reclassifications, tax (25) (11) (56) (5)
Unrealized Gains on Cash Flow Hedges, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 45 13 27 13
Other comprehensive income (loss) before reclassifications 18 3 36 3
Amounts reclassified to earnings and other 0 5 0 5
Other comprehensive income (loss), net of tax 18 8 36 8
Less: amounts attributable to noncontrolling interests 0 0 0 0
Other comprehensive income (loss) attributable to McKesson 18 8 36 8
Exercise of put right by noncontrolling shareholders of McKesson Europe AG       0
Ending balance 63 21 63 21
Unrealized Gains (Losses) and Other Components of Benefit Plans, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (34) (106) (67) (96)
Other comprehensive income (loss) before reclassifications 2 1 14 6
Amounts reclassified to earnings and other 0 1 24 (2)
Other comprehensive income (loss), net of tax 2 2 38 4
Less: amounts attributable to noncontrolling interests 0 0 3 0
Other comprehensive income (loss) attributable to McKesson 2 2 35 4
Exercise of put right by noncontrolling shareholders of McKesson Europe AG       (12)
Ending balance $ (32) $ (104) $ (32) $ (104)