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Stockholders' Equity (Tables) | 12 Months Ended
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Mar. 31, 2015
Stockholders' Equity Note [Abstract] |
Schedule of Shares Repurchased Over Last Three Years | Information regarding the share repurchase activity over the last three years is as follows:
| Share Repurchases (1)
(In millions, except price per share data) |  | Total Number of Shares Purchased (2) (3) |  | Average Price Paid Per Share |  | Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs
Balance, March 31, 2012 |  |  |  |  |  | $ | 299 |
Share repurchase plans approved: |  |  |  |  |  |
April 2012 |  |  |  |  |  | 700 |
January 2013 |  |  |  |  |  | 500 |
Shares repurchased |  | 13 |  | $ | 100.82 |  |  | (1,159 | )
Balance, March 31, 2013 |  |  |  |  |  | $ | 340 |
Shares repurchased |  | — |  | $ | — |  |  | — |
Balance, March 31, 2014 |  |  |  |  |  | $ | 340 |
Shares repurchased |  | 1.5 |  | $ | 226.55 |  |  | (340 | )
Balance, March 31, 2015 |  |  |  |  |  | $ | — |
Schedule of Comprehensive Income (Loss) | Information regarding other comprehensive income (loss) including noncontrolling and redeemable noncontrolling interests, net of tax, by component is as follows:
| Years Ended March 31,
(In millions) | 2015 |  | 2014 |  | 2013
Foreign currency translation adjustments |  |  |  |  |
Foreign currency translation adjustments arising during period, net of income tax expense (benefit) of nil, nil and ($2) (1) | $ | (1,845 | ) |  | $ | 9 |  |  | $ | (52 | )
Reclassified to income statement, net of income tax expense of nil, $24 and nil (2) | (10 | ) |  | 44 |  |  | — |
| (1,855 | ) |  | 53 |  |  | (52 | )
Unrealized losses on cash flow hedges |  |  |  |  |
Unrealized losses on cash flow hedges arising during period, net of income tax benefit of nil, nil and nil | (13 | ) |  | (6 | ) |  | — |
Reclassified to income statement, net of income tax expense of nil, nil and nil | 3 |  |  | — |  |  | — |
| (10 | ) |  | (6 | ) |  | — |
Changes in retirement-related benefit plans |  |  |  |  |
Net actuarial gain (loss) and prior service credit (cost) arising during period, net of income tax (benefit) of ($66), $16 and ($22) | (140 | ) |  | 17 |  |  | (40 | )
Amortization of actuarial loss, prior service cost and transition obligation, net of income tax expense of $6, $12 and $12 (3) | 11 |  |  | 22 |  |  | 18 |
Foreign currency translation adjustments and other, net of income tax expense of nil, nil and nil | 4 |  |  | (4 | ) |  | 4 |
Reclassified to income statement, net of income tax expense of nil, $1 and nil | 1 |  |  | 1 |  |  | — |
| (124 | ) |  | 36 |  |  | (18 | )
Other Comprehensive Income (Loss), net of tax | $ | (1,989 | ) |  | $ | 83 |  |  | $ | (70 | )
Accumulated Other Comprehensive Income | Information regarding changes in our accumulated other comprehensive income (loss) by component are as follows:
(In millions) | Foreign Currency Translation Adjustments, Net of Tax |  | Unrealized Losses on Cash Flow Hedges, Net of Tax |  | Unrealized Net Gains (Losses) and Other Components of Benefit Plans, Net of Tax |  | Total Accumulated Other Comprehensive Income (Loss)
Balance at March 31, 2013 | $ | 136 |  |  | $ | (5 | ) |  | $ | (196 | ) |  | $ | (65 | )
Other comprehensive income (loss) before reclassifications | 9 |  |  | (6 | ) |  | 35 |  |  | 38 |
Amounts reclassified to earnings | 44 |  |  | — |  |  | 1 |  |  | 45 |
Other comprehensive income (loss) | $ | 53 |  |  | $ | (6 | ) |  | $ | 36 |  |  | $ | 83 |
Less: other comprehensive income attributable to noncontrolling interests | 21 |  |  | — |  |  | — |  |  | 21 |
Other comprehensive income (loss) attributable to McKesson | $ | 32 |  |  | $ | (6 | ) |  | $ | 36 |  |  | $ | 62 |
Balance at March 31, 2014 | $ | 168 |  |  | $ | (11 | ) |  | $ | (160 | ) |  | $ | (3 | )
Other comprehensive income (loss) before reclassifications | (1,845 | ) |  | (13 | ) |  | (136 | ) |  | (1,994 | )
Amounts reclassified to earnings | (10 | ) |  | 3 |  |  | 12 |  |  | 5 |
Other comprehensive income (loss) | $ | (1,855 | ) |  | $ | (10 | ) |  | $ | (124 | ) |  | $ | (1,989 | )
Less: other comprehensive loss attributable to noncontrolling interests | (267 | ) |  | — |  |  | (12 | ) |  | (279 | )
Other comprehensive income (loss) attributable to McKesson | $ | (1,588 | ) |  | $ | (10 | ) |  | $ | (112 | ) |  | $ | (1,710 | )
Balance at March 31, 2015 | $ | (1,420 | ) |  | $ | (21 | ) |  | $ | (272 | ) |  | $ | (1,713 | )

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- Definition Tabular disclosure of accelerated share repurchase (ASR) programs. An ASR is a combination of transactions that permits an entity to purchase a targeted number of shares immediately with the final purchase price of those shares determined by an average market price over a fixed period of time. An accelerated share repurchase program is intended to combine the immediate share retirement benefits of a tender offer with the market impact and pricing benefits of a disciplined daily open market stock repurchase program. ASRs can be disclosed as part of stockholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Tabular disclosure of the components of accumulated 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 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 + Details
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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e526-108580 + Details
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