Earnings Per Share and Share Repurchases (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Earnings Per Share [Abstract]
Income from continuing operations	$ 67	$ 45	$ 105	$ 64
Income (loss) from discontinued operations, net of tax	13	(12)	4	(18)
Net income applicable to common shares	80	33	109	46
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted average outstanding shares of common stock	159.0	157.8	158.6	158.5
Dilutive effect of employee stock options and restricted stock	4.9	2.9	4.5	2.7
Common stock and common stock equivalents	163.9	160.7	163.1	161.2
Basic earnings per share: [Abstract]
From continuing operations	$ 0.42	$ 0.29	$ 0.66	$ 0.40
From discontinued operations	$ 0.08	$ (0.08)	$ 0.03	$ (0.11)
Net earnings (loss) per share (Basic)	$ 0.50	$ 0.21	$ 0.69	$ 0.29
Diluted earnings per share: [Abstract]
From continuing oeprations	$ 0.41	$ 0.28	$ 0.64	$ 0.40
From discontinued operations	$ 0.08	$ (0.07)	$ 0.03	$ (0.11)
Net earnings (loss) per share (Diluted)	$ 0.49	$ 0.21	$ 0.67	$ 0.29
Shares repurchased
Stock Repurchased and Retired During Period, Shares	0	1.8	0	3.6
Stock Repurchased and Retired During Period, Value	$ 0	$ 35	$ 0	$ 70

After tax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

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