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Stockholders' Equity (Tables) | 6 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Schedule of information regarding other comprehensive income (loss) including noncontrolling and redeemable noncontrolling interests, net of tax, by component | Information regarding other comprehensive income (loss) including redeemable noncontrolling interests, net of tax, by component is as follows:
| Quarter Ended September 30, |  | Six Months Ended September 30,
(In millions) | 2017 |  | 2016 |  | 2017 |  | 2016
Foreign currency translation adjustments (1) |  |  |  |  |  |  |
Foreign currency translation adjustments arising during period, net of income tax expense (benefit) of nil, $11, nil and ($1) (2) (3) | $ | 303 |  |  | $ | (109 | ) |  | $ | 685 |  |  | $ | (384 | )
Reclassified to income statement, net of income tax expense of nil, nil, nil and nil (4) | — |  |  | — |  |  | — |  |  | 20 |
| 303 |  |  | (109 | ) |  | 685 |  |  | (364 | )
Unrealized gains (losses) on net investment hedges (5) |  |  |  |  |  |  |
Unrealized gains (losses) on net investment hedges arising during period, net of income tax benefit of $25, nil, $69 and nil | (38 | ) |  | — |  |  | (108 | ) |  | — |
Reclassified to income statement, net of income tax expense of nil, nil, nil and nil | — |  |  | — |  |  | — |  |  | — |
| (38 | ) |  | — |  |  | (108 | ) |  | — |
Unrealized gains (losses) on cash flow hedges |  |  |  |  |  |  |
Unrealized gains (losses) on cash flow hedges arising during period, net of income tax expense of nil, nil, nil and nil | (3 | ) |  | (6 | ) |  | 11 |  |  | (6 | )
Changes in retirement-related benefit plans (6) |  |  |  |  |  |  |
Net actuarial loss and prior service cost arising during the period, net of income tax benefit of nil, nil, nil and nil | — |  |  | — |  |  | — |  |  | — |
Amortization of actuarial loss and prior service costs, net of income tax expense of nil, $1, nil and $2 (7) | 1 |  |  | 1 |  |  | 2 |  |  | 4 |
Foreign currency translation adjustments and other, net of income tax expense of nil, nil, nil and nil | (4 | ) |  | — |  |  | (10 | ) |  | 8 |
| (3 | ) |  | 1 |  |  | (8 | ) |  | 12 |
Other comprehensive income (loss), net of tax | $ | 259 |  |  | $ | (114 | ) |  | $ | 580 |  |  | $ | (358 | )
(1) | Foreign currency translation adjustments primarily result from the conversion of non-U.S. dollar financial statements of our foreign subsidiaries into the Company’s reporting currency, U.S. dollars.
(2) | The net foreign currency translation gains during the second quarter and first six months of 2018 were primarily due to the strengthening of the Euro, Canadian dollar and British pound sterling against the U.S. dollar from April 1, 2017 to September 30, 2017. During the second quarter and first six months of 2017, the currency translation losses were primarily due to the weakening of the British pound sterling against the U.S. dollar from April 1, 2016 to September 30, 2016.
(3) | The second quarter and first six months of 2018 includes net foreign currency translation gains of $33 million and $148 million and the second quarter and first six months of 2017 include net foreign currency translation gains of $1 million and losses of $66 million attributable to redeemable noncontrolling interests.
(4) | The first six months of 2017 includes net foreign currency translation losses of $20 million reclassified from accumulated other comprehensive income (loss) to loss from discontinued operations, net of tax, within our condensed consolidated statements of operations due to the sale of our Brazilian pharmaceutical distribution business.
(5) | The second quarter and first six months of 2018 includes foreign currency losses of $63 million and $177 million on the net investment hedges from the €1.2 billion Euro-denominated notes and £450 million British pound sterling-denominated notes.
(6) | The second quarter and first six months of 2018 include net actuarial losses of nil and $1 million and the second quarter and first six months of 2017 include net actuarial losses of nil and $1 million, which are attributable to redeemable noncontrolling interests.
(7) | Pre-tax amount reclassified into cost of sales and operating expenses in our condensed consolidated statements of operations. The related tax expense was reclassified into income tax expense in our condensed consolidated statements of operations.
Schedule of information regarding changes in accumulated other comprehensive income (loss), net of tax, by component | Information regarding changes in our accumulated other comprehensive income (loss), net of tax, by component for the second quarter and first six months of 2018 is as follows:
(In millions) | Foreign Currency Translation Adjustments, Net of Tax |  | Unrealized Losses on Net Investment Hedges, Net of Tax |  | Unrealized Gains (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 June 30, 2017 | $ | (1,606 | ) |  | $ | (78 | ) |  | $ | (17 | ) |  | $ | (235 | ) |  | (1,936 | )
Other comprehensive income (loss) before reclassifications | 303 |  |  | (38 | ) |  | (3 | ) |  | (4 | ) |  | 258 |
Amounts reclassified to earnings and other | — |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Other comprehensive income (loss) | 303 |  |  | (38 | ) |  | (3 | ) |  | (3 | ) |  | 259 |
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 33 |  |  | — |  |  | — |  |  | — |  |  | 33 |
Other comprehensive income (loss) attributable to McKesson | 270 |  |  | (38 | ) |  | (3 | ) |  | (3 | ) |  | 226 |
Balance at September 30, 2017 | $ | (1,336 | ) |  | $ | (116 | ) |  | $ | (20 | ) |  | $ | (238 | ) |  | $ | (1,710 | )
(In millions) | Foreign Currency Translation Adjustments, Net of Tax |  | Unrealized Losses on Net Investment Hedges, Net of Tax |  | Unrealized Gains (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, 2017 | $ | (1,873 | ) |  | $ | (8 | ) |  | $ | (31 | ) |  | $ | (229 | ) |  | (2,141 | )
Other comprehensive income (loss) before reclassifications | 685 |  |  | (108 | ) |  | 11 |  |  | (10 | ) |  | 578 |
Amounts reclassified to earnings and other | — |  |  | — |  |  | — |  |  | 2 |  |  | 2 |
Other comprehensive income (loss) | 685 |  |  | (108 | ) |  | 11 |  |  | (8 | ) |  | 580 |
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | 148 |  |  | — |  |  | — |  |  | 1 |  |  | 149 |
Other comprehensive income (loss) attributable to McKesson | 537 |  |  | (108 | ) |  | 11 |  |  | (9 | ) |  | 431 |
Balance at September 30, 2017 | $ | (1,336 | ) |  | $ | (116 | ) |  | $ | (20 | ) |  | $ | (238 | ) |  | $ | (1,710 | )

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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=66004124&loc=d3e526-108580 + Details
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