Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Income from continuing operations	$ 79	$ 58	$ 103	$ 103
Loss from discontinued operations, net of tax	0	(1)	0	(1)
Net income	79	57	103	102
Effect of dilutive securities - RSUs, MSUs, performance shares and stock options	0	0	0	0
Effect of dilutive securities - 10% convertible senior notes	0	0	0	2
Effect of dilutive securities - Deferred compensation program for non-employee directors	0	0	0	0
Income available to shareholders	$ 79	$ 57	$ 103	$ 104
Average common shares	145,424,853	144,500,682	145,393,548	139,702,728
Dilutive RSUs, MSUs, performance shares and stock options	1,600,000	2,300,000	1,600,000	2,500,000
Common shares issuable upon conversion of our 10% convertible senior notes	0	0	0	4,700,000
Deferred shares associated with a deferred compensation program for non-employee directors	0	200,000	200,000	0
Average diluted common shares	146,990,178	147,024,196	147,167,248	146,920,294
Income from continuing operations, per common share	$ 0.54	$ 0.40	$ 0.70	$ 0.74
Loss from discontinued operations, per common share	0.00	(0.01)	0.00	(0.01)
Earnings per average common share	0.54	0.39	0.70	0.73
Income from continuing operations, per diluted share	0.54	0.39	0.70	0.72
Loss from discontinued operations, per diluted share	0.00	(0.01)	0.00	(0.01)
Earnings per average diluted common share	$ 0.54	$ 0.38	$ 0.70	$ 0.71