Earnings Per Share

Basic and diluted earnings per share are computed by dividing Net income attributable to common stockholders by the weighted-average common shares outstanding in the period. Diluted earnings per share is computed by giving effect to all potentially dilutive securities that are outstanding. The following table summarizes basic and diluted earnings per share (in millions, except for per share amounts):



	Three Months Ended						Nine Months Ended
	September 30, 2015			September 30, 2014			September 30, 2015			September 30, 2014
Basic earnings per share
Net income attributable to stockholders	$	1,359		$	1,471		$	3,421		$	1,962
Less: cumulative dividends on Series A preferred stock(a)				(87		)				(263		)
Net income attributable to common stockholders	$	1,359		$	1,384		$	3,421		$	1,699

Weighted-average common shares outstanding	1,577			1,612			1,597			1,603
Basic earnings per common share	$	0.86		$	0.86		$	2.14		$	1.06
Diluted earnings per share
Net income attributable to common stockholders – basic	$	1,359		$	1,384		$	3,421		$	1,699
Less: earnings adjustment for dilutive stock compensation rights	(2		)	(8		)	(3		)	(22		)
Net income attributable to common stockholders – diluted	$	1,357		$	1,376		$	3,418		$	1,677

Weighted-average common shares outstanding – basic	1,577			1,612			1,597			1,603
Dilutive effect of warrants and restricted stock units (RSUs)	41			79			58			87
Weighted-average common shares outstanding – diluted	1,618			1,691			1,655			1,690

Diluted earnings per common share	$	0.84		$	0.81		$	2.07		$	0.99

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(a)	Includes earned but undeclared dividends of $15 million on our Series A preferred stock in the three and nine months ended September 30, 2014.

In the three and nine months ended September 30, 2015 and 2014 warrants to purchase 46 million shares were not included in the computation of diluted earnings per share because the warrants' exercise price was greater than the average market price of the common shares.