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Debt Long-term Debt Footnote L (Details) - USD ($)
$ in Millions
1 Months Ended
May 31, 2011
Dec. 31, 2016
Jan. 02, 2016
Debt Instrument [Line Items]      
Notional amounts of interest rate swaps   $ 4,018 $ 1,680
3.25% U.S. Dollar Notes Due 2018      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 400    
Debt Instrument, Term 7 years    
Debt instrument, stated interest rate 3.25%    
Debt Instrument, Interest Rate, Effective Percentage   2.57%  
Unamortized gain on termination of interest rate swaps   $ 7