Earnings per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 02, 2011	Jul. 03, 2010	Jul. 02, 2011	Jul. 03, 2010
Earnings for basic and diluted earnings per share:
Net income (loss)	$ 19	$ 20	$ 34	$ 15
Less: Distributed and undistributed amounts allocated to participating securities	0	0	0	0
Net income (loss) adjusted for distributed and undistributed amounts allocated to participating securities	19	20	34	15
Less: Net (income) loss attributable to noncontrolling interest of special purpose entities	0	0	1	1
Net income (loss) available to common shareholders	$ 19	$ 20	$ 35	$ 16
Weighted average shares outstanding:
Weighted average shares outstanding - basic (in shares)	108,600,000	107,900,000	108,500,000	107,800,000
Dilutive effect of stock options and unvested stock-settled restricted stock units (in shares)	2,200,000	1,800,000	2,100,000	1,700,000
Weighted average shares outstanding - diluted (in shares)	110,800,000	109,700,000	110,600,000	109,500,000
Options held by employees of spun-off entities [Abstract]
Options held	305,000	451,000	305,000	451,000
Options exercisable	305,000	436,000	305,000	436,000
Weighted average exercise price (in dollars per share)	$ 20	$ 19	$ 20	$ 19
Weighted average remaining contractual term (in years)	4	5	4	5
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share (in shares)	0	649,000	1,058,000	1,358,000
Stock Options Held By Employees of Spun-Off Entities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share (in shares)	0	160,000	160,000	279,000