Income Taxes 2 (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Current:
Federal	$ 285	$ 284	$ 184
State	50	37	33
Foreign	95	56	(19)
Total current	430	377	198
Deferred:
Federal	(86)	(74)	(82)
State	(20)	(12)	(12)
Foreign	(9)	14	25
Total deferred	(115)	(72)	(69)
Total:
Federal	199	210	102
State	30	25	21
Foreign	86	70	6
Income tax expense from continuing operations	$ 315	$ 305	$ 129