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Debt Long-term Debt Footnote G (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2014
Feb. 28, 2013
Dec. 31, 2016
Sep. 30, 2016
Jan. 02, 2016
Debt Instrument [Line Items]          
Notional amounts of interest rate swaps     $ 4,018   $ 1,680
2.75% U.S. Dollar Note Due 2023          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 400      
Debt Instrument, Term   10 years      
Debt instrument, stated interest rate   2.75%      
Debt Instrument, Interest Rate, Effective Percentage   2.34%      
Notional amounts of interest rate swaps       $ 211  
Fair value adjustment for interest rate swaps     $ 9    
Debt Instrument Amount Redeemed $ 189        
Interest expense 10        
Debt Instrument Accelerated Gains 1        
Debt instrument, fee amount $ 2        
4.25% U.S. Dollar Notes Due 2013          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 750      
Debt instrument, stated interest rate   4.25%