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)