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Stockholders' Equity - Schedule of Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 8,287 | $ 10,057 | $ 11,273
Other comprehensive income (loss) before reclassifications | 53 | (207) |
Amounts reclassified to earnings and other | 96 | 9 |
Other Comprehensive Income (Loss), Net of Tax | 149 | (198) | 609
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 3 | (66) |
Other comprehensive income (loss) attributable to McKesson | 146 | (132) | 424
Ending balance | 5,309 | 8,287 | 10,057
Foreign Currency Translation Adjustments, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward] |  |  |
Beginning balance | (1,628) | (1,258) |
Other comprehensive income (loss) before reclassifications | (151) | (431) | 804
Amounts reclassified to earnings and other | 0 | 0 | 0
Other Comprehensive Income (Loss), Net of Tax | (151) | (431) | 804
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 1 | (61) |
Other comprehensive income (loss) attributable to McKesson | (152) | (370) |
Ending balance | (1,780) | (1,628) | (1,258)
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward] |  |  |
Beginning balance | 53 | (188) |
Other comprehensive income (loss) before reclassifications | 85 | 241 | (180)
Amounts reclassified to earnings and other | 0 | 0 | 0
Other Comprehensive Income (Loss), Net of Tax | 85 | 241 | (180)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 0 | 0 |
Other comprehensive income (loss) attributable to McKesson | 85 | 241 |
Ending balance | 138 | 53 | (188)
Unrealized Gains (Losses) on Cash Flow Hedges, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward] |  |  |
Beginning balance | (37) | (61) |
Other comprehensive income (loss) before reclassifications | 86 | 24 | (30)
Amounts reclassified to earnings and other | 0 | 0 | 0
Other Comprehensive Income (Loss), Net of Tax | 86 | 24 | (30)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 0 | 0 |
Other comprehensive income (loss) attributable to McKesson | 86 | 24 |
Ending balance | 49 | (37) | (61)
Unrealized Net Gains (Losses) and Other Components of Benefit Plans, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward] |  |  |
Beginning balance | (237) | (210) |
Other comprehensive income (loss) before reclassifications | 33 | (41) |
Amounts reclassified to earnings and other | 96 | 9 |
Other Comprehensive Income (Loss), Net of Tax | 129 | (32) |
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 2 | (5) |
Other comprehensive income (loss) attributable to McKesson | 127 | (27) |
Ending balance | (110) | (237) | (210)
Total Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward] |  |  |
Beginning balance | (1,849) | (1,717) | (2,141)
Other comprehensive income (loss) attributable to McKesson | 146 | (132) | 424
Ending balance | $ (1,703) | $ (1,849) | $ (1,717)

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