Valuation and Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts
Balance at beginning of year	$ 20	$ 23	$ 24
Charged to costs and expenses	7	2	8
Deductions from reserves	(9)	(5)	(9)
Balance at end of year	18	20	23
Inventory FIFO reserves [Member]
Valuation and Qualifying Accounts
Balance at beginning of year	133	158	114
Charged to costs and expenses	35	54	126
Deductions from reserves	(34)	(79)	(82)
Balance at end of year	$ 134	$ 133	$ 158