Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Schedule of earnings per share

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