Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Statements of Comprehensive Income [Abstract]
Net Income	$ 380	$ 286
Other Comprehensive Income (Loss), net of tax
Foreign Currency Translation Adjustments, Net of Income Tax Expense of $4 and $7	(41)	11
Other, Net of Income Tax Expense of $3 and $3	6	5
Total Other Comprehensive Income (Loss)	(35)	16
Comprehensive Income	$ 345	$ 302