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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, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 5,309 | $ 8,287 | $ 10,057
Other comprehensive income (loss) before reclassifications | 99 | 53 |
Amounts reclassified to earnings and other | 71 | 96 |
Other comprehensive income (loss), net of tax | 170 | 149 | (198)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | (53) | 3 |
Other comprehensive income (loss) attributable to McKesson | 223 | 146 | (132)
Ending balance | 175 | 5,309 | 8,287
Foreign Currency Translation Adjustments, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward] |  |  |
Beginning balance | (1,780) | (1,628) |
Other comprehensive income (loss) before reclassifications | 312 | (151) | (431)
Amounts reclassified to earnings and other | 47 | 0 | 0
Other comprehensive income (loss), net of tax | 359 | (151) | (431)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | (60) | 1 |
Other comprehensive income (loss) attributable to McKesson | 419 | (152) |
Ending balance | (1,361) | (1,780) | (1,628)
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward] |  |  |
Beginning balance | 138 | 53 |
Other comprehensive income (loss) before reclassifications | (175) | 85 | 241
Amounts reclassified to earnings and other | 0 | 0 | 0
Other comprehensive income (loss), net of tax | (175) | 85 | 241
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | (1) | 0 |
Other comprehensive income (loss) attributable to McKesson | (174) | 85 |
Ending balance | (36) | 138 | 53
Unrealized Gains (Losses) on Cash Flow Hedges, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward] |  |  |
Beginning balance | 49 | (37) |
Other comprehensive income (loss) before reclassifications | (36) | 86 | 24
Amounts reclassified to earnings and other | 0 | 0 | 0
Other comprehensive income (loss), net of tax | (36) | 86 | 24
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 0 | 0 |
Other comprehensive income (loss) attributable to McKesson | (36) | 86 |
Ending balance | 13 | 49 | (37)
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 | (110) | (237) |
Other comprehensive income (loss) before reclassifications | (2) | 33 |
Amounts reclassified to earnings and other | 24 | 96 |
Other comprehensive income (loss), net of tax | 22 | 129 |
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 8 | 2 |
Other comprehensive income (loss) attributable to McKesson | 14 | 127 |
Ending balance | (96) | (110) | (237)
Total Accumulated Other Comprehensive Loss |  |  |
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward] |  |  |
Beginning balance | (1,703) | (1,849) | (1,717)
Other comprehensive income (loss) attributable to McKesson | 223 | 146 | (132)
Ending balance | $ (1,480) | $ (1,703) | $ (1,849)

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