Earnings Per Common Share (Tables)

12 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Basic and Diluted Earnings per Common Share

	Years Ended March 31,
(In millions, except per share amounts)	2013		2012		2011
Income from continuing operations	$	1,338	$	1,403	$	1,130
Discontinued operation - gain on sale, net of tax	—		—		72
Net income	$	1,338	$	1,403	$	1,202
Weighted average common shares outstanding:
Basic	235		246		258
Effect of dilutive securities:
Options to purchase common stock	1		2		3
Restricted stock units	3		3		2
Diluted	239		251		263
Earnings per common share: (1)
Diluted
Continuing operations	$	5.59	$	5.59	$	4.29
Discontinued operation - gain on sale	—		—		0.28
Total	$	5.59	$	5.59	$	4.57
Basic
Continuing operations	$	5.71	$	5.70	$	4.37
Discontinued operation - gain on sale	—		—		0.28
Total	$	5.71	$	5.70	$	4.65

(1) Certain computations may reflect rounding adjustments.