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Income Taxes - Components Of Provision For Income Taxes Related To Continuing Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Current      
Federal $ 658 $ 453 $ 484
State 96 90 64
Foreign 90 101 193
Total current 844 644 741
Deferred      
Federal 95 195 24
State 42 53 10
Foreign (73) (77) (18)
Total deferred 64 171 16
Income tax expense $ 908 $ 815 $ 757