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Stockholders' Equity (Tables) | 9 Months Ended
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Dec. 31, 2018
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 noncontrolling interests and redeemable noncontrolling interests, net of tax, by component is as follows:
| Quarter Ended December 31, |  | Nine Months Ended December 31,
(In millions) | 2018 |  | 2017 |  | 2018 |  | 2017
Foreign currency translation adjustments (1) |  |  |  |  |  |  |
Foreign currency translation adjustments arising during period, net of income tax benefit of nil, nil, nil and nil (2) (3) | $ | (188 | ) |  | $ | 30 |  |  | $ | (456 | ) |  | $ | 715 |
Reclassified to income statement, net of income tax expense of nil, nil, nil and nil | — |  |  | — |  |  | — |  |  | — |
| (188 | ) |  | 30 |  |  | (456 | ) |  | 715 |
Unrealized gains (losses) on net investment hedges arising during period, net of income tax (expense) benefit of ($27), $9, ($85) and $78 (4) | 75 |  |  | (19 | ) |  | 240 |  |  | (127 | )
Reclassified to income statement, net of income tax expense of nil, nil, nil and nil | — |  |  | — |  |  | — |  |  | — |
| 75 |  |  | (19 | ) |  | 240 |  |  | (127 | )
Unrealized gains (losses) on cash flow hedges |  |  |  |  |  |  |
Unrealized gains (losses) on cash flow hedges arising during period, net of income tax (expense) benefit of ($5), $2, ($5) and $2 | 35 |  |  | (16 | ) |  | 37 |  |  | (5 | )
Reclassified to income statement, net of income tax expense of nil, nil, nil and nil | — |  |  | — |  |  | — |  |  | — |
| 35 |  |  | (16 | ) |  | 37 |  |  | (5 | )
Changes in retirement-related benefit plans (5) |  |  |  |  |  |  |
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, prior service cost and transition obligation, net of income tax expense (benefit) of ($1), nil, $1 and nil (6) | 1 |  |  | 1 |  |  | 5 |  |  | 3 |
Foreign currency translation adjustments and other, net of income tax expense of nil, nil, nil and nil | 2 |  |  | — |  |  | 10 |  |  | (10 | )
| 3 |  |  | 1 |  |  | 15 |  |  | (7 | )
Other comprehensive income (loss), net of tax | $ | (75 | ) |  | $ | (4 | ) |  | $ | (164 | ) |  | $ | 576 |
(1) | Foreign currency translation adjustments primarily result from the conversion of non-U.S. dollar financial statements of our foreign subsidiary, McKesson Europe, into the Company’s reporting currency, U.S. dollars, during the third quarters and first nine months of 2019 and 2018.
(2) | During the third quarter and first nine months of 2019, the net foreign currency translation losses were primarily due to the weakening of the Euro, British pound sterling and Canadian dollar against the U.S. dollar from April 1, 2018 to December 31, 2018. During the third quarter of 2018, the net foreign currency translation gains were primarily due to the strengthening of the Euro against the U.S. dollar from October 1, 2017 to December 31, 2017. The net foreign currency translation gains during the first nine 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 December 31, 2017.
(3) | The third quarter and first nine months of 2019 include net foreign currency translation losses of $11 million and $57 million and the third quarter and first nine months of 2018 include net foreign currency translation gains of $12 million and $160 million attributable to redeemable noncontrolling interests.
(4) | The third quarter and first nine months of 2019 include foreign currency gains of $39 million and $223 million on the net investment hedges from the €1.95 billion Euro-denominated notes and £450 million British pound sterling-denominated notes and gains of $63 million and $102 million on the net investment hedges from the cross-currency swaps. The third quarter and first nine months of 2018 include foreign currency losses of $28 million and $205 million on the net investment hedges from the €1.20 billion Euro-denominated notes and £450 million British pound sterling-denominated notes.
(5) | The third quarter and first nine months of 2019 include net actuarial gains of nil and $2 million and the third quarter and first nine months of 2018 include net actuarial losses of nil and $1 million, which are attributable to redeemable noncontrolling interests.
(6) | 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 third quarter and nine months of 2019 is as follows:
| Foreign Currency Translation Adjustments |  |  |  |  |  |
(In millions) | Foreign Currency Translation Adjustments, Net of Tax |  | Unrealized Gains (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 September 30, 2018 | $ | (1,480 | ) |  | $ | (23 | ) |  | $ | (59 | ) |  | $ | (200 | ) |  | $ | (1,762 | )
Other comprehensive income (loss) before reclassifications | (188 | ) |  | 75 |  |  | 35 |  |  | 2 |  |  | (76 | )
Amounts reclassified to earnings and other | — |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Other comprehensive income (loss) | (188 | ) |  | 75 |  |  | 35 |  |  | 3 |  |  | (75 | )
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | (11 | ) |  | — |  |  | — |  |  | — |  |  | (11 | )
Other comprehensive income (loss) attributable to McKesson | (177 | ) |  | 75 |  |  | 35 |  |  | 3 |  |  | (64 | )
Balance at December 31, 2018 | $ | (1,657 | ) |  | $ | 52 |  |  | $ | (24 | ) |  | $ | (197 | ) |  | $ | (1,826 | )
| Foreign Currency Translation Adjustments |  |  |  |  |  |
(In millions) | Foreign Currency Translation Adjustments, Net of Tax |  | Unrealized Gains (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, 2018 | $ | (1,258 | ) |  | $ | (188 | ) |  | $ | (61 | ) |  | $ | (210 | ) |  | $ | (1,717 | )
Other comprehensive income (loss) before reclassifications | (456 | ) |  | 240 |  |  | 37 |  |  | 10 |  |  | (169 | )
Amounts reclassified to earnings | — |  |  | — |  |  | — |  |  | 5 |  |  | 5 |
Other comprehensive income (loss) | (456 | ) |  | 240 |  |  | 37 |  |  | 15 |  |  | (164 | )
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests | (57 | ) |  | — |  |  | — |  |  | 2 |  |  | (55 | )
Other comprehensive income (loss) attributable to McKesson | (399 | ) |  | 240 |  |  | 37 |  |  | 13 |  |  | (109 | )
Balance at December 31, 2018 | $ | (1,657 | ) |  | $ | 52 |  |  | $ | (24 | ) |  | $ | (197 | ) |  | $ | (1,826 | )

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e526-108580 + Details
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