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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, 2019	Mar. 31, 2018	Mar. 31, 2017
Current
Federal	$ (20)	$ 577	$ 524
State	35	33	86
Foreign	152	205	122
Total current	167	815	732
Deferred
Federal	223	(767)	767
State	44	17	164
Foreign	(78)	(118)	(49)
Total deferred	189	(868)	882
Income tax expense (benefit)	$ 356	$ (53)	$ 1,614

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