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Schedule II - Valuation and Qualifying Accounts (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Jan. 01, 2011
Allowance for Doubtful Accounts
      
Valuation and Qualifying Accounts      
Balance at beginning of year $ 18 $ 20 $ 23
Charged to costs and expenses 4 7 2
Deductions from reserves (3) (9) (5)
Balance at end of year 19 18 20
Inventory FIFO reserves
      
Valuation and Qualifying Accounts      
Balance at beginning of year 134 133 158
Charged to costs and expenses 42 35 54
Deductions from reserves (40) (34) (79)
Balance at end of year $ 136 $ 134 $ 133