Stockholders' Equity 1 (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Dec. 31, 2011	Dec. 31, 2010
Components of comprehensive income
Net income		$ 263			$ 200			$ 740	$ 639
Net unrealized gain on cash flow hedges, net of tax		0			0			0	2
Foreign currency translation adjustments		2			9			(66)	49
Total comprehensive income		265			209			674	690
Cash Dividends
Declaration Date		Nov. 09, 2011	Aug. 03, 2011	May 12, 2011	Dec. 02, 2010	Jul. 28, 2010	May 12, 2010
Dividend Per Share	$ 0.25	$ 0.05	$ 0.05	$ 0.05	$ 0.04	$ 0.04	$ 0.04
Record Date		Nov. 22, 2011	Aug. 16, 2011	May 23, 2011	Dec. 13, 2010	Aug. 09, 2010	May 31, 2010
Total Amount		$ 25	$ 25	$ 25	$ 20	$ 20	$ 21
Payment Date		Dec. 14, 2011	Sep. 14, 2011	Jun. 16, 2011	Dec. 22, 2010	Aug. 19, 2010	Jun. 16, 2010

Aggregate dividends declared during the period for each share of common stock outstanding.

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