Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Income Taxes (Textual) [Abstract]
Income tax expense	$ 141	$ 126	$ 337	$ 284
Net tax benefits (expense) from international tax rate changes and investment in foreign subsidiary			8
Net tax benefit (expense) from international tax rate changes	(10)
Net tax benefits (expenses) from discrete items recognized during the period		$ (26)		$ 10
Effective Income Tax Rate Excluding Discrete Items			32.40%	31.90%
Maximum [Member]
Effective income tax rate continuing operations tax rate reconciliation [Line Items]
Expected fiscal year 2012 effective tax rate			32.00%
Minimum [Member]
Effective income tax rate continuing operations tax rate reconciliation [Line Items]
Expected fiscal year 2012 effective tax rate			31.00%