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Stockholders' Equity - Schedule of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) | 3 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications | $ (121,000,000) |
Reclassified to income statement, net of income tax expense | 0 |
Other Comprehensive Income (Loss), Net of Tax | (121,000,000) | $ 321,000,000
Foreign currency translation adjustments arising during period, tax | 0 | 0
Reclassified to income statement, tax | 0 | 0
Unrealized gains on cash flow hedges arising during period, tax | 0 | 0
Net actuarial loss and prior service cost arising during the period, tax | 0 | 0
Amortization of actuarial loss and prior service costs, tax | 0 | 0
Foreign currency translation adjustments and other, tax | 0 | 0
Net actuarial losses attributable to redeemable noncontrolling interest | 2,000,000 | 1,000,000
Foreign Currency Translation Adjustments, Net of Tax |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications | (273,000,000) | 382,000,000
Reclassified to income statement, net of income tax expense | 0 | 0
Other Comprehensive Income (Loss), Net of Tax | (273,000,000) | 382,000,000
Unrealized Losses on Net Investment Hedges, Net of Tax |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications | 144,000,000 | (70,000,000)
Reclassified to income statement, net of income tax expense | 0 | 0
Other Comprehensive Income (Loss), Net of Tax | 144,000,000 | (70,000,000)
Unrealized gains (losses) on net investment hedges arising during period, tax | (51,000,000) | 44,000,000
Reclassified to income statement, tax | 0 | 0
Unrealized Gains (Losses) on Cash Flow Hedges, Net of Tax |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications | 0 | 14,000,000
Reclassified to income statement, net of income tax expense | 0 | 0
Other Comprehensive Income (Loss), Net of Tax | 0 | 14,000,000
Accumulated Defined Benefit Plans Adjustment, Net Prior Service and Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications | 0 | 0
Accumulated Defined Benefit Plans Adjustment, Amortization of Actuarial Loss, Prior Service Cost and Transition Obligation, Including Portion Attributable to Noncontrolling Interest |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications | 1,000,000 | 1,000,000
Accumulated Defined Benefit Plans, Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss) before reclassifications | 7,000,000 | (6,000,000)
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Reclassified to income statement, net of income tax expense | 0 | 0
Other Comprehensive Income (Loss), Net of Tax | $ 8,000,000 | $ (5,000,000)

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- Definition Amount of tax expense (benefit), before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32211-110900 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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