Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Schedule of Earnings Per Share Reconciliation

The following table presents a reconciliation of basic and diluted earnings per share (in millions, except share data and per share amounts):

	Year Ended December 31,
	2015		2014		2013
Basic:
Net income	$	268	$	293	$	86
Basic weighted-average shares outstanding (in thousands)	290,762		288,705		286,991
Basic earnings per share	$	0.92	$	1.02	$	0.30
Diluted:
Net income	$	268	$	293	$	86
Basic weighted-average shares outstanding (in thousands)	290,762		288,705		286,991
Effect of dilutive securities:
Weighted-average convertible debentures (in thousands)	2,820		3,999		4,125
Weighted-average options and restricted stock issued to employees (in thousands)	1,429		1,399		1,473
Diluted weighted-average shares outstanding (in thousands)	295,011		294,103		292,589
Diluted earnings per share	$	0.91	$	1.00	$	0.29