Stockholders' Equity 1 (Details) (USD $) In Millions, except Per Share data	3 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Components of comprehensive income
Net income	$ 241	$ 217
Net unrealized gain on cash flow hedges, net of tax	0	1
Unrealized gain/(loss) on marketable securities, net of tax	0	0
Foreign currency translation adjustments	17	(34)
Total comprehensive income	258	184
Cash Dividends
Declaration Date	May 12, 2011	May 12, 2010
Dividend Per Share	$ 0.05	$ 0.04
Record Date	May 23, 2011	May 31, 2010
Total Amount	$ 25	$ 21
Payment Date	Jun. 16, 2011	Jun. 16, 2010

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

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