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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, 2018	Mar. 31, 2017	Mar. 31, 2016
Current
Federal	$ 577	$ 524	$ 658
State	33	86	96
Foreign	205	122	90
Total current	815	732	844
Deferred
Federal	(767)	767	95
State	17	164	42
Foreign	(118)	(49)	(73)
Total deferred	(868)	882	64
Income tax (benefit) expense	$ (53)	$ 1,614	$ 908

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