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Stockholders' Equity - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ 11,273 |
Other comprehensive income (loss) before reclassifications | 320 |
Amounts reclassified to earnings and other | 1 |
Other Comprehensive Income (Loss), Net of Tax | 321 | $ (244)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 116 |
Other comprehensive income (loss) attributable to McKesson | 205 |
Ending balance | 11,513 |
Foreign Currency Translation Adjustments, Net of Tax |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (1,873) |
Other comprehensive income (loss) before reclassifications | 382 | (275)
Amounts reclassified to earnings and other | 0 | 20
Other Comprehensive Income (Loss), Net of Tax | 382 | (255)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 115 |
Other comprehensive income (loss) attributable to McKesson | 267 |
Ending balance | (1,606) |
Unrealized Losses on Net Investment Hedges, Net of Tax |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (8) |
Other comprehensive income (loss) before reclassifications | (70) | 0
Amounts reclassified to earnings and other | 0 | 0
Other Comprehensive Income (Loss), Net of Tax | (70) | 0
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 0 |
Other comprehensive income (loss) attributable to McKesson | (70) |
Ending balance | (78) |
Unrealized Gains (Losses) on Cash Flow Hedges, Net of Tax |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (31) |
Other comprehensive income (loss) before reclassifications | 14 |
Amounts reclassified to earnings and other | 0 |
Other Comprehensive Income (Loss), Net of Tax | 14 | $ 0
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 0 |
Other comprehensive income (loss) attributable to McKesson | 14 |
Ending balance | (17) |
Unrealized Net Gains (Losses) and Other Components of Benefit Plans, Net of Tax |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (229) |
Other comprehensive income (loss) before reclassifications | (6) |
Amounts reclassified to earnings and other | 1 |
Other Comprehensive Income (Loss), Net of Tax | (5) |
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 1 |
Other comprehensive income (loss) attributable to McKesson | (6) |
Ending balance | (235) |
Total Accumulated Other Comprehensive Income (Loss) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (2,141) |
Ending balance | $ (1,936) |

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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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- 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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- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669625-108580 Reference 4: 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 + Details
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- Definition Amount after tax of other comprehensive income (loss) attributable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569643-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683 + Details
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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569643-111683 + Details
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