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Debt - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2016
Apr. 02, 2016
Jan. 02, 2016
Debt Instrument [Line Items]      
Proceeds from Debt, Net of Issuance Costs $ 1,382    
Notional amounts of interest rate swaps   $ 2,709 $ 1,680
7.45% US. Dollar Debentures Due 2031      
Debt Instrument [Line Items]      
Debt Instrument Amount Redeemed $ 475    
Debt instrument, stated interest rate 7.45% 7.45%  
Interest Expense, Debt $ 153    
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%    
4.5% U.S. Notes Due 2046      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 650    
Debt instrument term 30 years    
Debt instrument, stated interest rate 4.50%    
Notes Payable, Other Payables | 4.15% U.S. Dollar Notes Due 2019      
Debt Instrument [Line Items]      
Debt instrument term   10 years  
Debt instrument, stated interest rate   4.15%  
Effective interest rate (a)   3.52%  
Notes Payable, Other Payables | 4.0% U.S. Dollar Notes Due 2020      
Debt Instrument [Line Items]      
Debt instrument term   10 years  
Debt instrument, stated interest rate   4.00%  
Effective interest rate (a)   2.98%  
Notes Payable, Other Payables | 3.125% U.S. Dollar Notes Due 2022      
Debt Instrument [Line Items]      
Debt instrument term   10 years  
Debt instrument, stated interest rate   3.125%  
Effective interest rate (a)   2.69%  
Notes Payable, Other Payables | 4.45% U.S. Dollar Notes Due 2016      
Debt Instrument [Line Items]      
Debt instrument term   7 years  
Debt instrument, stated interest rate   4.45%  
Effective interest rate (a)   4.45%  
Notes Payable, Other Payables | 1.875% U.S. Dollar Notes Due 2016      
Debt Instrument [Line Items]      
Debt instrument term   5 years  
Debt instrument, stated interest rate   1.875%  
Effective interest rate (a)   1.81%  
Notes Payable, Other Payables | 1.75% U.S. Dollar Notes Due 2017      
Debt Instrument [Line Items]      
Debt instrument term   5 years  
Debt instrument, stated interest rate   1.75%  
Effective interest rate (a)   1.71%  
Notes Payable, Other Payables | 3.25% U.S. Dollar Notes Due 2018      
Debt Instrument [Line Items]      
Debt instrument term   7 years  
Debt instrument, stated interest rate   3.25%  
Effective interest rate (a)   2.52%