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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, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 9,008 | $ 8,085 | $ 10,318
Other comprehensive income (loss) before reclassifications | (688) | 142 |
Amounts reclassified to earnings | 29 | 30 |
Other Comprehensive Income (Loss), Net of Tax | (659) | 172 | (1,989)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | (79) | 20 |
Other comprehensive income (loss) attributable to McKesson | (580) | 152 | (1,884)
Ending balance | 11,273 | 9,008 | 8,085
Foreign Currency Translation Adjustments, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward] |  |  |
Beginning balance | (1,323) | (1,420) |
Other comprehensive income (loss) before reclassifications | (644) | 113 | (1,845)
Amounts reclassified to earnings | 20 | 0 | (10)
Other Comprehensive Income (Loss), Net of Tax | (624) | 113 | (1,855)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | (74) | 16 |
Other comprehensive income (loss) attributable to McKesson | (550) | 97 |
Ending balance | (1,873) | (1,323) | (1,420)
Unrealized Losses on Net Investment Hedges, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward] |  |  |
Beginning balance | 0 | 0 |
Other comprehensive income (loss) before reclassifications | (8) | 0 | 0
Amounts reclassified to earnings | 0 | 0 | 0
Other Comprehensive Income (Loss), Net of Tax | (8) | 0 | 0
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 0 | 0 |
Other comprehensive income (loss) attributable to McKesson | (8) | 0 |
Ending balance | (8) | 0 | 0
Unrealized Gains (Losses) on Cash Flow Hedges, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward] |  |  |
Beginning balance | (12) | (21) |
Other comprehensive income (loss) before reclassifications | (19) | 6 | (13)
Amounts reclassified to earnings | 0 | 3 | 3
Other Comprehensive Income (Loss), Net of Tax | (19) | 9 | (10)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 0 | 0 |
Other comprehensive income (loss) attributable to McKesson | (19) | 9 |
Ending balance | (31) | (12) | (21)
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 | (226) | (272) |
Other comprehensive income (loss) before reclassifications | (17) | 23 |
Amounts reclassified to earnings | 9 | 27 |
Other Comprehensive Income (Loss), Net of Tax | (8) | 50 |
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | (5) | 4 |
Other comprehensive income (loss) attributable to McKesson | (3) | 46 |
Ending balance | (229) | (226) | (272)
Total Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss), Change, Net of Tax [Roll Forward] |  |  |
Beginning balance | (1,561) | (1,713) | (3)
Other comprehensive income (loss) attributable to McKesson | (580) | 152 | (1,710)
Ending balance | $ (2,141) | $ (1,561) | $ (1,713)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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