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Income Taxes - Reconciliation Between Effective Tax Rate On Income From Continuing Operations And Statutory Tax Rate (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]      
Income tax expense at federal statutory rate $ 1,137 $ 930 $ 760
State income taxes net of federal tax benefit 92 81 57
Foreign income taxed at various rates (295) (247) (177)
Canadian litigation (8) 0 122
Controlled substance distribution reserve 0 58 0
Unrecognized tax benefits and settlements (6) 10 (6)
Tax credits (18) (10) (6)
Other, net 6 (7) 7
Income tax expense $ 908 $ 815 $ 757