Earnings Per Share

12 Months Ended

Dec. 31, 2016

Basic earnings per share is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding. Diluted earnings per share is computed by dividing net income available to common stockholders by the weighted-average number of common shares plus the effect of dilutive potential common shares outstanding during the period. The following table sets forth the computation of basic and diluted earnings per share (shares in thousands):



	Year Ended December 31,
	2016		2015		2014
Numerator:
Net income available to common stockholders	$	566	$	585	$	540
Denominator:
Denominator for basic earnings per share—weighted-average common shares	87,217		95,170		97,489
Effect of dilutive securities:
Employee stock options and warrants	277		300		394
4 percent Convertible Senior Notes	—		660		6,386
Restricted stock units	281		249		687
Denominator for diluted earnings per share—adjusted weighted-average common shares	87,775		96,379		104,956
Basic earnings per share	$	6.49	$	6.14	$	5.54
Diluted earnings per share	$	6.45	$	6.07	$	5.15