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Stockholders' Equity - Schedule of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) before reclassifications $ (688) $ 142  
Amounts reclassified to earnings 29 30  
Other Comprehensive Income (Loss), Net of Tax (659) 172 $ (1,989)
Foreign Currency Translation Adjustments, Net of Tax      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) before reclassifications (644) 113 (1,845)
Amounts reclassified to earnings 20 0 (10)
Other Comprehensive Income (Loss), Net of Tax (624) 113 (1,855)
Tax expense (benefit) 1 23 0
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 (8) 0 0
Amounts reclassified to earnings 0 0 0
Other Comprehensive Income (Loss), Net of Tax (8) 0 0
Tax expense (benefit) 5 0 0
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 (19) 6 (13)
Amounts reclassified to earnings 0 3 3
Other Comprehensive Income (Loss), Net of Tax (19) 9 (10)
Tax expense (benefit) 0 0 0
Reclassification, tax expense 0 0 0
Net actuarial gain (loss) and prior service credit (cost) arising during period, net of income tax expense (benefit) of $4, $13 and ($66) (6)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) before reclassifications (20) 23 (140)
Tax expense (benefit) (4) (13) 66
Reclassification, tax expense 4 18 6
Amortization of actuarial gain (loss), prior service cost and transition obligation, net of income tax expense (benefit) of $4, $18 and $6 (7)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) before reclassifications 9 30 11
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 3 (3) 4
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 1
Other Comprehensive Income (Loss), Net of Tax $ (8) $ 50 $ (124)