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Stockholders' Equity (Deficit) - Schedule of Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Beginning balance $ (1,599,000,000) $ (1,490,000,000) $ (1,792,000,000)
Other comprehensive income (loss), net of tax (51,000,000) 24,000,000 673,000,000
Other comprehensive income (loss) attributable to McKesson (51,000,000) 24,000,000 673,000,000
Ending balance (1,694,000,000) (1,599,000,000) (1,490,000,000)
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification before tax 0 0 0
Reclassification to income statement, tax expense 11,000,000   6,000,000
Disposed of by Sale | Canadian Retail Disposal Group      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Accumulated other comprehensive loss in charge for remeasurement to fair value 48,000,000    
Net Investment Hedging | Derivatives designated for hedge accounting: | Cross-currency swaps      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Other comprehensive income (loss), net investment hedge, gain (loss) 80,000,000 3,000,000 28,000,000
Net Investment Hedging | Derivatives designated for hedge accounting: | Euro Denominated Notes      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Other comprehensive income (loss), net investment hedge, gain (loss) 0 0 7,000,000
Cash Flow Hedging | Derivatives designated for hedge accounting: | Fixed interest rate swaps      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification before tax 0 14,000,000 (30,000,000)
Cash Flow Hedging | Derivatives designated for hedge accounting: | Cross-currency swaps      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification before tax (4,000,000) 39,000,000 (54,000,000)
Total Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Beginning balance (881,000,000) (905,000,000) (1,534,000,000)
Other comprehensive income (loss) before reclassifications (176,000,000) 26,000,000 (179,000,000)
Amount reclassified to earnings and other 125,000,000 (2,000,000) 852,000,000
Other comprehensive income (loss), net of tax (51,000,000) 24,000,000 673,000,000
Less: amounts attributable to noncontrolling interests     44,000,000
Other comprehensive income (loss) attributable to McKesson     629,000,000
Ending balance (932,000,000) (881,000,000) (905,000,000)
Foreign Currency Translation Adjustments, Net of Tax      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Beginning balance (856,000,000) (847,000,000) (1,504,000,000)
Other comprehensive income (loss) before reclassifications (214,000,000) (9,000,000) (329,000,000)
Amount reclassified to earnings and other 81,000,000 0 1,027,000,000
Other comprehensive income (loss), net of tax (133,000,000) (9,000,000) 698,000,000
Ending balance (989,000,000) (856,000,000) (847,000,000)
Foreign Currency Translation Adjustments, Net of Tax      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Other comprehensive income (loss) attributable to McKesson     657,000,000
Foreign Currency Translation Adjustments, Net of Tax      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Less: amounts attributable to noncontrolling interests     41,000,000
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Beginning balance (12,000,000) (14,000,000) 10,000,000
Other comprehensive income (loss) before reclassifications 59,000,000 2,000,000 112,000,000
Amount reclassified to earnings and other 0 0 (136,000,000)
Other comprehensive income (loss), net of tax 59,000,000 2,000,000 (24,000,000)
Ending balance 47,000,000 (12,000,000) (14,000,000)
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax | Net Investment Hedging      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Other comprehensive income (loss) before reclassification, tax (21,000,000) (1,000,000) (33,000,000)
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax | Cash Flow Hedging      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Other comprehensive income (loss) before reclassification, tax (3,000,000) 14,000,000 (21,000,000)
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Less: amounts attributable to noncontrolling interests     0
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Other comprehensive income (loss) attributable to McKesson     (24,000,000)
Unrealized Gains (Losses) on Cash Flow and other Hedges, Net of Tax      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Beginning balance 3,000,000 (36,000,000) 27,000,000
Other comprehensive income (loss) before reclassifications (5,000,000) 39,000,000 10,000,000
Amount reclassified to earnings and other (2,000,000) 0 (73,000,000)
Other comprehensive income (loss), net of tax (7,000,000) 39,000,000 (63,000,000)
Ending balance (4,000,000) 3,000,000 (36,000,000)
Unrealized Gains (Losses) on Cash Flow and other Hedges, Net of Tax      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Less: amounts attributable to noncontrolling interests     0
Unrealized Gains (Losses) on Cash Flow and other Hedges, Net of Tax      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Other comprehensive income (loss) attributable to McKesson     (63,000,000)
Unrealized Gains (Losses) and Other Components of Benefit Plans, Net of Tax      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Beginning balance (16,000,000) (8,000,000) (67,000,000)
Other comprehensive income (loss) before reclassifications (16,000,000) (6,000,000) 28,000,000
Amount reclassified to earnings and other 46,000,000 (2,000,000) 34,000,000
Other comprehensive income (loss), net of tax 30,000,000 (8,000,000) 62,000,000
Ending balance $ 14,000,000 $ (16,000,000) (8,000,000)
Unrealized Gains (Losses) and Other Components of Benefit Plans, Net of Tax      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Less: amounts attributable to noncontrolling interests     3,000,000
Unrealized Gains (Losses) and Other Components of Benefit Plans, Net of Tax      
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward]      
Other comprehensive income (loss) attributable to McKesson     $ 59,000,000