Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Earnings Per Share

The following table provides a reconciliation between basic and diluted earnings per share:

Millions, Except Per Share Amounts,
for the Three Months Ended March 31,	2015		2014
Net income	$	1,151	$	1,088
Weighted-average number of shares outstanding:
Basic		879.3		908.1
Dilutive effect of stock options		1.8		2.6
Dilutive effect of retention shares and units		1.7		1.8
Diluted		882.8		912.5
Earnings per share – basic	$	1.31	$	1.20
Earnings per share – diluted	$	1.30	$	1.19
Stock options excluded as their inclusion would be anti-dilutive		0.6		0.7