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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 11,273 |
Other comprehensive income (loss) before reclassifications | $ 258 |  | 578 |
Amounts reclassified to earnings and other | 1 |  | 2 |
Other Comprehensive Income (Loss), Net of Tax | 259 | $ (114) | 580 | $ (358)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 33 |  | 149 |
Other comprehensive income (loss) attributable to McKesson | 226 |  | 431 |
Ending balance | 11,362 |  | 11,362 |
Foreign Currency Translation Adjustments, Net of Tax |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (1,606) |  | (1,873) |
Other comprehensive income (loss) before reclassifications | 303 | (109) | 685 | (384)
Amounts reclassified to earnings and other | 0 | 0 | 0 | 20
Other Comprehensive Income (Loss), Net of Tax | 303 | (109) | 685 | (364)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 33 |  | 148 |
Other comprehensive income (loss) attributable to McKesson | 270 |  | 537 |
Ending balance | (1,336) |  | (1,336) |
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (78) |  | (8) |
Other comprehensive income (loss) before reclassifications | (38) | 0 | (108) | 0
Amounts reclassified to earnings and other | 0 | 0 | 0 | 0
Other Comprehensive Income (Loss), Net of Tax | (38) | 0 | (108) | 0
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 0 |  | 0 |
Other comprehensive income (loss) attributable to McKesson | (38) |  | (108) |
Ending balance | (116) |  | (116) |
Unrealized Gains (Losses) on Cash Flow Hedges, Net of Tax |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (17) |  | (31) |
Other comprehensive income (loss) before reclassifications | (3) |  | 11 |
Amounts reclassified to earnings and other | 0 |  | 0 |
Other Comprehensive Income (Loss), Net of Tax | (3) | $ (6) | 11 | $ (6)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 0 |  | 0 |
Other comprehensive income (loss) attributable to McKesson | (3) |  | 11 |
Ending balance | (20) |  | (20) |
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (235) |  | (229) |
Other comprehensive income (loss) before reclassifications | (4) |  | (10) |
Amounts reclassified to earnings and other | 1 |  | 2 |
Other Comprehensive Income (Loss), Net of Tax | (3) |  | (8) |
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 0 |  | 1 |
Other comprehensive income (loss) attributable to McKesson | (3) |  | (9) |
Ending balance | (238) |  | (238) |
Total Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (1,936) |  | (2,141) |
Ending balance | $ (1,710) |  | $ (1,710) |

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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