Earnings Per Share and Equity (Tables)

9 Months Ended

Sep. 30, 2014

Earnings Per Share [Abstract]

Reconciliation of basic and diluted earnings per share

The following table sets forth the components of basic and diluted earnings per share and shows the effect of these stock options, performance share awards and restricted stock on the weighted average number of shares outstanding (in millions) used in calculating diluted earnings per share: 

	Three Months Ended September 30,				Nine Months Ended September 30,
	2014		2013		2014		2013
Net income attributable to common shareholders	$	993	$	738	$	1,604	$	1,224
Average common shares outstanding — basic	861		857		860		856
Potentially dilutive effect of stock options, performance share awards and restricted stock	2		3		3		4
Average common shares outstanding — diluted	863		860		863		860