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Debt - Commercial Paper, Credit Facilities and Senior Notes (Details)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 13, 2013
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
item
Dec. 31, 2013
USD ($)
Dec. 31, 2014
USD ($)
Debt            
Repayments of senior notes       $ 549 $ 250  
Commercial paper program            
Debt            
Maximum aggregate borrowing capacity       3,000    
Senior secured hedged inventory facility            
Debt            
Committed borrowing capacity       1,400    
Maximum aggregate borrowing capacity       $ 1,900    
Basis for variable interest rate       Eurocurrency Rate or the Base Rate    
Number of years by which maturity date of credit facility may be extended       1 year    
Senior secured hedged inventory facility | Minimum            
Debt            
Credit facility extensions available | item       1    
Senior secured hedged inventory facility | Letters of credit            
Debt            
Committed borrowing capacity       $ 400    
Senior unsecured revolving credit facility            
Debt            
Committed borrowing capacity       1,600    
Maximum aggregate borrowing capacity       $ 2,100    
Basis for variable interest rate       Eurocurrency Rate, the Base Rate or the Canadian Prime Rate    
Number of years by which maturity date of credit facility may be extended       1 year    
Senior unsecured revolving credit facility | Minimum            
Debt            
Credit facility extensions available | item       1    
Senior unsecured 364-day revolving credit facility            
Debt            
Committed borrowing capacity       $ 1,000    
Basis for variable interest rate       Eurocurrency Rate or the Base Rate    
Senior notes            
Debt            
Debt instrument face value       $ 9,800   $ 9,300
Senior notes | Consolidated finance subsidiary co-issuer            
Debt            
Consolidated subsidiary, ownership interest held by the parent (as a percent)       100.00%    
Senior notes | Level 2            
Debt            
Debt instrument fair value       $ 8,600   $ 9,900
4.65% senior notes due October 2025            
Debt            
Debt instrument, interest rate (as a percent)       4.65%    
Public offering price (as a percent)       99.846%    
Debt instrument face value       $ 1,000    
2.60% senior notes due December 2019            
Debt            
Debt instrument, interest rate (as a percent)       2.60%   2.60%
Public offering price (as a percent)           99.813%
Debt instrument face value           $ 500
4.90% senior notes due February 2045            
Debt            
Debt instrument, interest rate (as a percent)       4.90%   4.90%
Public offering price (as a percent)           99.876%
Debt instrument face value           $ 650
3.60% senior notes due November 2024            
Debt            
Debt instrument, interest rate (as a percent)       3.60%   3.60%
Public offering price (as a percent)           99.842%
Debt instrument face value           $ 750
4.70% senior notes due June 2044            
Debt            
Debt instrument, interest rate (as a percent)       4.70%   4.70%
Public offering price (as a percent)           99.734%
Debt instrument face value           $ 700
3.85% senior notes due October 2023            
Debt            
Debt instrument, interest rate (as a percent)       3.85% 3.85% 3.85%
Public offering price (as a percent)         99.792%  
Debt instrument face value         $ 700  
5.25% senior notes due June 2015            
Debt            
Debt instrument, interest rate (as a percent)     5.25%     5.25%
Repayments of senior notes     $ 150      
3.95% senior notes due September 2015            
Debt            
Debt instrument, interest rate (as a percent)   3.95%       3.95%
Repayments of senior notes   $ 400        
5.63% senior notes            
Debt            
Debt instrument, interest rate (as a percent) 5.63%          
Repayments of senior notes $ 250