Earnings Per Share and Equity (Tables)

3 Months Ended

Mar. 31, 2015

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 March 31,
	2015		2014
Net income attributable to common shareholders	$	693	$	90
Average common shares outstanding — basic	862		858
Potentially dilutive effect of stock options, performance share awards and restricted stock	5		3
Average common shares outstanding — diluted	867		861