Income Taxes 2 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Current:
Federal	$ 284us-gaap_CurrentFederalTaxExpenseBenefit	$ 184us-gaap_CurrentFederalTaxExpenseBenefit	$ 261us-gaap_CurrentFederalTaxExpenseBenefit
State	37	33	39
Foreign	56us-gaap_CurrentForeignTaxExpenseBenefit	(19)us-gaap_CurrentForeignTaxExpenseBenefit	26us-gaap_CurrentForeignTaxExpenseBenefit
Total current	377us-gaap_CurrentIncomeTaxExpenseBenefit	198us-gaap_CurrentIncomeTaxExpenseBenefit	326us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	(74)	(82)	(18)
State	(12)	(12)	3
Foreign	14	25	28
Total deferred	(72)us-gaap_DeferredIncomeTaxExpenseBenefit	(69)us-gaap_DeferredIncomeTaxExpenseBenefit	13us-gaap_DeferredIncomeTaxExpenseBenefit
Total:
Federal	210	102	243
State	25	21	42
Foreign	70	6	54
Income tax expense from continuing operations	$ 305us-gaap_IncomeTaxExpenseBenefit	$ 129us-gaap_IncomeTaxExpenseBenefit	$ 339us-gaap_IncomeTaxExpenseBenefit

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