Net Income Per Share (Tables)

3 Months Ended

Jun. 30, 2012

Earnings Per Share Reconciliation [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

	Three Months Ended June 30,
(In millions, except per share data)	2012		2011
Net income	$	201	$	221
Shares used to compute net income per share:
Weighted-average common stock outstanding - basic	317		331
Dilutive potential common shares	3		6
Weighted-average common stock outstanding - diluted	320		337
Net income per share:
Basic	$	0.63	$	0.67
Diluted	$	0.63	$	0.66