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Stockholders' Equity - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 8,068 | $ 9,647 | $ 8,287 | $ 10,057
Other comprehensive income (loss) before reclassifications | (23) | 29 | 41 | (93)
Amounts reclassified to earnings | 79 | 3 | 92 | 4
Other Comprehensive Income (Loss), Net of Tax | 56 | 32 | 133 | (89)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | (18) | (7) | (12) | (44)
Other comprehensive income (loss) attributable to McKesson | 74 | 39 | 145 | (45)
Ending balance | 6,692 | 9,534 | 6,692 | 9,534
Foreign Currency Translation Adjustments, Net of Tax |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (1,564) | (1,492) | (1,628) | (1,258)
Other comprehensive income (loss) before reclassifications | (114) | 5 | (44) | (268)
Amounts reclassified to earnings | 0 | 0 | 0 | 0
Other Comprehensive Income (Loss), Net of Tax | (114) | 5 | (44) | (268)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | (19) | (7) | (13) | (46)
Other comprehensive income (loss) attributable to McKesson | (95) | 12 | (31) | (222)
Ending balance | (1,659) | (1,480) | (1,659) | (1,480)
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 27 | (44) | 53 | (188)
Other comprehensive income (loss) before reclassifications | 82 | 21 | 56 | 165
Amounts reclassified to earnings | 0 | 0 | 0 | 0
Other Comprehensive Income (Loss), Net of Tax | 82 | 21 | 56 | 165
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 0 | 0 | 0 | 0
Other comprehensive income (loss) attributable to McKesson | 82 | 21 | 56 | 165
Ending balance | 109 | (23) | 109 | (23)
Unrealized Gains (Losses) on Cash Flow Hedges, Net of Tax |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (25) | (61) | (37) | (61)
Other comprehensive income (loss) before reclassifications | 13 | 2 | 25 | 2
Amounts reclassified to earnings | 0 | 0 | 0 | 0
Other Comprehensive Income (Loss), Net of Tax | 13 | 2 | 25 | 2
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 0 | 0 | 0 | 0
Other comprehensive income (loss) attributable to McKesson | 13 | 2 | 25 | 2
Ending balance | (12) | (59) | (12) | (59)
Unrealized Net Gains (Losses) and Other Components of Benefit Plans, Net of Tax |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (216) | (204) | (237) | (210)
Other comprehensive income (loss) before reclassifications | (4) | 1 | 4 | 8
Amounts reclassified to earnings | 79 | 3 | 92 | 4
Other Comprehensive Income (Loss), Net of Tax | 75 | 4 | 96 | 12
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 1 | 0 | 1 | 2
Other comprehensive income (loss) attributable to McKesson | 74 | 4 | 95 | 10
Ending balance | (142) | (200) | (142) | (200)
Total Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (1,778) | (1,801) | (1,849) | (1,717)
Other comprehensive income (loss) attributable to McKesson | 74 | 39 | 145 | (45)
Ending balance | $ (1,704) | $ (1,762) | $ (1,704) | $ (1,762)

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