Income Taxes (Details) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		2 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2013 Brazilian Tax Authority [Member] USD ($)	Dec. 31, 2013 Brazilian Tax Authority [Member] BRL
Income Tax Examination [Line Items]
Tax assessment including interest and penalties					$ 89	211
Period of unrecognized tax benefit adjustment for Brazilian tax assessment					12 months	12 months
Income Taxes (Textual) [Abstract]
Income tax expense	87	107	75	342
Net discrete tax benefit recognized primarily from completion of federal income tax returns examination			184
Timing of resolution of income tax examinations			12 months
Period of unrecognized tax benefit			12 months
Significant change in unrecognized tax benefits is reasonably possible within next 12 months, Estimated range of change, Upper bound	40		40
Estimated annual effective tax rate, which excludes impact of discrete items			29.40%	32.60%
Expected fiscal year 2014 effective tax rate			14.00%
Reduction in uncertain tax positions resulting from completion of federal income tax returns examination			221
Cash refund received from completion of federal income tax returns examination	$ 70		$ 70