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Stockholders' Equity - Schedule of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) before reclassifications $ (207) $ 604  
Amounts reclassified to earnings 9 5  
Other Comprehensive Income (Loss), Net of Tax (198) 609 $ (659)
Foreign Currency Translation Adjustments, Net of Tax      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) before reclassifications (431) 804 (644)
Amounts reclassified to earnings 0 0 20
Other Comprehensive Income (Loss), Net of Tax (431) 804 (624)
Tax expense (benefit) 0 0 1
Reclassification, tax expense 0 0 0
Unrealized Losses on Net Investment Hedges, Net of Tax      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) before reclassifications 241 (180) (8)
Amounts reclassified to earnings 0 0 0
Other Comprehensive Income (Loss), Net of Tax 241 (180) (8)
Tax expense (benefit) (71) 95 5
Reclassification, tax expense 0 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 24 (30) (19)
Amounts reclassified to earnings 0 0 0
Other Comprehensive Income (Loss), Net of Tax 24 (30) (19)
Tax expense (benefit) (4) 9 0
Reclassification, tax expense 0 0 0
Net actuarial gain (loss) and prior service credit (cost) arising during the period, net of income tax (expense) benefit      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) before reclassifications (51) 25 (20)
Tax expense (benefit) 5 (2) (4)
Reclassification, tax expense 0 (2) (4)
Amortization of actuarial gain, prior service cost and transition obligation, net of income tax (expense)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) before reclassifications 9 5 9
Changes in Retirement-Related Benefit Plans, Foreign Currency Translation Adjustments and Other      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) before reclassifications 10 (15) 3
Tax expense (benefit) 0 0 0
Reclassification, tax expense 0 0 0
Unrealized Net Gains (Losses) and Other Components of Benefit Plans, Net of Tax      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified to earnings 0 0 0
Other Comprehensive Income (Loss), Net of Tax $ (32) $ 15 $ (8)