Goodwill and Intangible Assets (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Goodwill and Intangible Assets
Total amortization expense		$ 40	$ 51	$ 52
Estimated amortization expense for 2013		36
Estimated amortization expense for 2014		35
Estimated amortization expense for 2015		34
Estimated amortization expense for 2016		28
Estimated amortization expense for 2017		24
Impaired Intangible Assets
Impairment of Intangible Assets, Finite-lived	41
Customer agreements and contractual relationships
Impaired Intangible Assets
Impairment of Intangible Assets, Finite-lived	37
Patents and technology
Impaired Intangible Assets
Impairment of Intangible Assets, Finite-lived	$ 4