Stockholders' Equity

9 Months Ended

Sep. 30, 2013

Disclosure Text Block [Abstract]

Stockholders' Equity

9. Stockholders’ Equity

The reconciliation between basic and diluted earnings per share attributable to common stockholders is as follows:

	Three Months Ended   September 30,				Nine Months Ended   September 30,
millions except per-share amounts	2013		2012		2013		2012
Net income (loss)
Net income (loss) attributable to common stockholders	$	182	$	121	$	1,571	$	2,188
Less distributions on participating securities	—		—		1		1
Less undistributed income allocated to participating securities	1		1		9		13
Basic	$	181	$	120	$	1,561	$	2,174
Diluted	$	181	$	120	$	1,561	$	2,174
Shares
Average number of common shares outstanding—basic	503		500		502		499
Dilutive effect of stock options	2		2		2		2
Average number of common shares outstanding—diluted	505		502		504		501
Excluded (1)	3		6		4		6
Net income (loss) per common share
Basic	$	0.36	$	0.24	$	3.11	$	4.35
Diluted	$	0.36	$	0.24	$	3.10	$	4.34
Dividends per common share	$	0.18	$	0.09	$	0.36	$	0.27

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⁽¹⁾  Inclusion of certain shares would have had an anti-dilutive effect.