Earnings Per Share and Share Repurchases (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Abstract]
Income from continuing operations	$ 58	$ 23	$ 163	$ 87
Income (loss) from discontinued operations, net of tax	(1)	(7)	3	(25)
Net income applicable to common shares	57	16	166	62
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted average outstanding shares of common stock	159.6	157.4	158.9	158.1
Dilutive effect of employee stock options and restricted stock	5.2	2.8	5.1	2.8
Common stock and common stock equivalents	164.8	160.2	164.0	160.9
Basic earnings per share: [Abstract]
From continuing operations	$ 0.36	$ 0.15	$ 1.03	$ 0.55
From discontinued operations	$ 0.00	$ (0.05)	$ 0.01	$ (0.16)
Net earnings (loss) per share (Basic)	$ 0.36	$ 0.10	$ 1.04	$ 0.39
Diluted earnings per share: [Abstract]
From continuing oeprations	$ 0.35	$ 0.14	$ 0.99	$ 0.54
From discontinued operations	$ 0.00	$ (0.04)	$ 0.02	$ (0.15)
Net earnings (loss) per share (Diluted)	$ 0.35	$ 0.10	$ 1.01	$ 0.39
Shares repurchased
Stock Repurchased and Retired During Period, Shares	0		0	3.6
Stock Repurchased and Retired During Period, Value	$ 0		$ 0	$ 70