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Debt Long-term Debt Footnote D (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2001
Mar. 31, 2016
Dec. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Debt Instrument [Line Items]          
Notional amounts of interest rate swaps     $ 4,966 $ 4,018  
3.25% U.S. Dollar Notes Due 2026          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 750      
Debt Instrument, Term   10 years      
Debt instrument, stated interest rate   3.25%      
Debt Instrument, Interest Rate, Effective Percentage     3.66%    
Notional amounts of interest rate swaps         $ 300
Fair value adjustment for interest rate swaps     $ 17    
7.45% U.S. Dollar Debentures Due 2031          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 625        
Debt Instrument, Term 30 years        
Debt instrument, stated interest rate 7.45%        
Debt Instrument, Interest Rate, Effective Percentage 7.54%        
Debt Instrument Amount Redeemed   $ 475