Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2014

Stockholders' Equity Note [Abstract]

Common Stock Rollforward

The following summarizes the changes in the Company’s outstanding shares of common stock:

millions	2014	2013	2012
Shares of common stock issued
Shares at January 1	523	519	516
Exercise of stock options	2	2	1
Issuance of restricted stock	1	2	2
Shares at December 31	526	523	519
Shares of common stock held in treasury
Shares at January 1	19	18	18
Shares received for restricted stock vested and options exercised	—	1	—
Shares at December 31	19	19	18
Shares of common stock outstanding at December 31	507	504	501

Earnings Per Share Table

The following provides a reconciliation between basic and diluted EPS attributable to common stockholders for the years ended December 31:

millions except per-share amounts	2014			2013		2012
Net income (loss)
Net income (loss) attributable to common stockholders	$	(1,750	)	$	801	$	2,391
Less distributions on participating securities	4			2		1
Less undistributed income allocated to participating securities	—			4		14
Basic	$	(1,754	)	$	795	$	2,376
Diluted	$	(1,754	)	$	795	$	2,376
Shares
Average number of common shares outstanding—basic	506			502		500
Dilutive effect of stock options	—			3		2
Average number of common shares outstanding—diluted	506			505		502
Excluded (1)	11			4		6
Net income (loss) per common share
Basic	$	(3.47	)	$	1.58	$	4.76
Diluted	$	(3.47	)	$	1.58	$	4.74
Dividends per common share	$	0.99		$	0.54	$	0.36

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