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Income Taxes - Schedule of Income Tax Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Income Taxes [Line Items]      
Current taxes $ 709 $ 842 $ 809
Deferred taxes (52) (8) (10)
Income tax expense 657 834 799
Domestic Countries      
Income Taxes [Line Items]      
Current taxes 721 616 642
Deferred taxes (80) (1) 3
Foreign Countries      
Income Taxes [Line Items]      
Current taxes (12) 226 167
Deferred taxes $ 28 $ (7) $ (13)