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Stockholders' Deficit - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2023
Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ (1,490) $ (1,792)
Other comprehensive income, net of tax 57 636
Other comprehensive income (loss) attributable to McKesson 57 636
Ending balance (1,240) (1,472)
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) 0 64
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) (20)  
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax   12
Total Accumulated Other Comprehensive Loss    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (905) (1,534)
Other comprehensive income (loss) before reclassifications 57 (101)
Amounts reclassified to earnings and other 0 737
Other comprehensive income, net of tax 57 636
Less: amounts attributable to noncontrolling interests 0 50
Other comprehensive income (loss) attributable to McKesson 57 586
Ending balance (848) (948)
Foreign Currency Translation Adjustments, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (847) (1,504)
Other comprehensive income (loss) before reclassifications 67 (176)
Amounts reclassified to earnings and other 0 730
Other comprehensive income, net of tax 67 554
Less: amounts attributable to noncontrolling interests 0 47
Other comprehensive income (loss) attributable to McKesson 67 507
Ending balance (780) (997)
Unrealized Losses on Net Investment Hedges, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (14) 10
Other comprehensive income (loss) before reclassifications (15) 45
Amounts reclassified to earnings and other 0 (17)
Other comprehensive income, net of tax (15) 28
Less: amounts attributable to noncontrolling interests 0 0
Other comprehensive income (loss) attributable to McKesson (15) 28
Ending balance (29) 38
Other Comprehensive Income (Loss) before Reclassifications, Tax 5 (31)
Unrealized Gains (Losses) on Cash Flow and Other Hedges, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (36) 27
Other comprehensive income (loss) before reclassifications 7 18
Amounts reclassified to earnings and other 0 0
Other comprehensive income, net of tax 7 18
Less: amounts attributable to noncontrolling interests 0 0
Other comprehensive income (loss) attributable to McKesson 7 18
Ending balance (29) 45
Unrealized Losses and Other Components of Benefit Plans, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (8) (67)
Other comprehensive income (loss) before reclassifications (2) 12
Amounts reclassified to earnings and other 0 24
Other comprehensive income, net of tax (2) 36
Less: amounts attributable to noncontrolling interests 0 3
Other comprehensive income (loss) attributable to McKesson (2) 33
Ending balance $ (10) $ (34)