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Stockholders' Deficit - Schedule of Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
 3 Months Ended
Jun. 30, 2024
Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ (1,599,000,000) $ (1,490,000,000)
Other comprehensive income (loss) before reclassifications (32,000,000) 57,000,000
Amounts reclassified to earnings and other 0 0
Other comprehensive income (loss), net of tax (32,000,000) 57,000,000
Less: amounts attributable to noncontrolling interests 0 0
Other comprehensive income (loss) attributable to McKesson (32,000,000) 57,000,000
Ending balance (1,381,000,000) (1,240,000,000)
Other comprehensive income (loss), cash flows hedge, gain (loss) reclassification, before tax 0 0
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)   (20,000,000)
Derivatives designated for hedge accounting | Net Investment Hedging | Currency swap    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Other comprehensive income (loss), net investment hedge, gain (loss) 7,000,000 (20,000,000)
Derivatives designated for hedge accounting | Cash Flow Hedges | Currency swap    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Other comprehensive income (loss), cash flows hedge, gain (loss) reclassification, before tax 0 (6,000,000)
Derivatives designated for hedge accounting | Cash Flow Hedges | Fixed interest rate swaps    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Other comprehensive income (loss), cash flows hedge, gain (loss) reclassification, before tax 0 16,000,000
Total Accumulated Other Comprehensive Loss    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (881,000,000) (905,000,000)
Ending balance (913,000,000) (848,000,000)
Foreign Currency Translation Adjustments, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (856,000,000) (847,000,000)
Other comprehensive income (loss) before reclassifications (36,000,000) 67,000,000
Amounts reclassified to earnings and other 0 0
Other comprehensive income (loss), net of tax (36,000,000) 67,000,000
Ending balance (892,000,000) (780,000,000)
Foreign Currency Translation Adjustments, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Less: amounts attributable to noncontrolling interests 0 0
Foreign Currency Translation Adjustments, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Other comprehensive income (loss) attributable to McKesson (36,000,000) 67,000,000
Unrealized (Losses) on Net Investment Hedges, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (12,000,000) (14,000,000)
Other comprehensive income (loss) before reclassifications 5,000,000 (15,000,000)
Amounts reclassified to earnings and other 0 0
Other comprehensive income (loss), net of tax 5,000,000 (15,000,000)
Ending balance (7,000,000) (29,000,000)
Other comprehensive income (loss) before reclassification, tax (2,000,000) (5,000,000)
Unrealized (Losses) on Net Investment Hedges, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Less: amounts attributable to noncontrolling interests 0 0
Unrealized (Losses) on Net Investment Hedges, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Other comprehensive income (loss) attributable to McKesson 5,000,000 (15,000,000)
Unrealized [Gains (Losses)] on Cash Flow and Other Hedges, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 3,000,000 (36,000,000)
Other comprehensive income (loss) before reclassifications 0 7,000,000
Amounts reclassified to earnings and other 0 0
Other comprehensive income (loss), net of tax 0 7,000,000
Ending balance 3,000,000 (29,000,000)
Other comprehensive income (loss) before reclassification, tax   3,000,000
Unrealized [Gains (Losses)] on Cash Flow and Other Hedges, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Less: amounts attributable to noncontrolling interests 0 0
Unrealized [Gains (Losses)] on Cash Flow and Other Hedges, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Other comprehensive income (loss) attributable to McKesson 0 7,000,000
Unrealized Losses and Other Components of Benefit Plans, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (16,000,000) (8,000,000)
Other comprehensive income (loss) before reclassifications (1,000,000) (2,000,000)
Amounts reclassified to earnings and other 0 0
Other comprehensive income (loss), net of tax (1,000,000) (2,000,000)
Ending balance (17,000,000) (10,000,000)
Unrealized Losses and Other Components of Benefit Plans, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Less: amounts attributable to noncontrolling interests 0 0
Unrealized Losses and Other Components of Benefit Plans, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Other comprehensive income (loss) attributable to McKesson $ (1,000,000) $ (2,000,000)