Income Taxes 6 (Details) In Millions, unless otherwise specified	12 Months Ended			5 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	Mar. 31, 2014 Brazilian Tax Authority [Member] USD ($)	Mar. 31, 2014 Brazilian Tax Authority [Member] BRL
Income Tax Disclosure [Abstract]
Total deferred tax assets, net of valuation allowance	$ 572	$ 647
U.S. federal, state and foreign net operating loss carryforwards	672	764
Net operating loss carryforwards subject to expiration	524
Net operating loss carryforwards expiration period	between 2014 and 2033
Net operating loss carryforwards not subject to expiration	148
Change in valuation allowance	4	7
Deferred tax assets reclassified from non-current to current		150
Unremitted earnings of foreign subsidiaries	2,349	2,220
Determination of tax on unremitted foreign earnings is not practicable	It is not practicable to determine the amount of tax associated with such unremitted earnings.
Liability for uncertain tax positions, Gross	202	486
Liability for uncertain tax positions, Current	0	0
Deferred tax assets related to uncertain tax positions	17	51
Unrecognized tax benefits that would affect effective tax rate	127	311
Amount of interest and penalties accrued	32	104	118
Amount of interest and penalties recognized	(72)	(14)	20
Timing of resolution of income tax examinations (in months)	12 months
Period of unrecognized tax benefit (in months)	12 months
Significant change in unrecognized tax benefits is reasonably possible within next 12 months, Estimated range of change, Upper bound	30
Income Tax Examination [Line Items]
Tax assessment including interest and penalties				$ 93	211
Period of unrecognized tax benefit adjustment for Brazilian tax assessment (in months)				12 months	12 months