Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Statement of Comprehensive Income [Abstract]
Net Income	$ 424	$ 380
Other Comprehensive Income (Loss), Net of Tax
Foreign currency translation adjustments, net of income tax expense $2 and $4	(61)	(41)
Unrealized gains on cash flow hedges, net of income tax expense of nil and nil	1	0
Retirement related benefit plans, net of income tax expense of $4 and $3	7	6
Other Comprehensive Loss, net of tax	(53)	(35)
Comprehensive Income	$ 371	$ 345