Earnings per share (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Computation for basic and diluted earnings per share

The computation for basic and diluted EPS was as follows (in millions, except per share data):

	Three months ended
	March 31,
	2013		2012
Income (Numerator):
Net income for basic and diluted EPS	$	1,434	$	1,184
Shares (Denominator):
Weighted-average shares for basic EPS	751		791
Effect of dilutive securities	13		9
Weighted-average shares for diluted EPS	764		800
Basic EPS	$	1.91	$	1.50
Diluted EPS	$	1.88	$	1.48