Income Taxes 3 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Schedule of effective income tax rate reconciliation
Tax expense at U.S. federal statutory tax rate	$ 364	$ 452	$ 465
Effect of international operations	(144)	(128)	(89)
U.S. federal and state tax contingencies	(123)	(8)	23
Domestic manufacturing deduction	(24)	(21)	(19)
State taxes, net of U.S. federal tax benefit	19	23	17
Valuation allowance	23	11	(15)
Other, net	25	25	25
Income tax expense from continuing operations	$ 140	$ 354	$ 407