Stockholders' Equity Stockholders' Equity (Other Comprehensive Income (Loss), Net of Tax) (Parentheticals) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Equity [Abstract]
Foreign currency translation adjustments arising during period, income tax expense of nil and $2	$ 0	$ 2
Unrealized losses on cash flow hedges arising during period, income tax expense of nil and nil	0	0
Amortization of actuarial loss, prior service cost and transition obligation, income tax expense of $1 and $4	1	4
Foreign currency translation adjustments, income tax expense of nil and nil	$ 0	$ 0