Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustments, income tax expense (benefit) of nil, ($4), $24 and ($2)	$ 0	$ (4)	$ 24	$ (2)
Unrealized gains (losses) on cash flow hedges and other, income tax expense of nil, nil, nil and nil	0	0	0	0
Retirement-related benefit plans, income tax expense of $4, $3, $11 and $8	$ 4	$ 3	$ 11	$ 8