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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)

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