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Debt - Commercial Paper, Credit Facilities and Senior Notes (Details)
1 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Jan. 31, 2017
USD ($)
Aug. 31, 2016
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2017
USD ($)
extension
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]                
Repayments of senior notes           $ 1,350,000,000 $ 175,000,000 $ 549,000,000
Commercial Paper                
Debt Instrument [Line Items]                
Maximum aggregate borrowing capacity $ 3,000,000,000.0         3,000,000,000.0    
Senior secured hedged inventory facility                
Debt Instrument [Line Items]                
Maximum aggregate borrowing capacity 1,900,000,000.0         1,900,000,000.0    
Committed borrowing capacity 1,400,000,000.0         $ 1,400,000,000.0    
Number of years by which maturity date of credit facility may be extended           1 year    
Senior secured hedged inventory facility | Minimum                
Debt Instrument [Line Items]                
Credit facility extensions available | extension           1    
Senior secured hedged inventory facility | Letters of credit                
Debt Instrument [Line Items]                
Committed borrowing capacity 400,000,000         $ 400,000,000    
Senior unsecured revolving credit facility                
Debt Instrument [Line Items]                
Maximum aggregate borrowing capacity 2,100,000,000.0         2,100,000,000.0    
Committed borrowing capacity 1,600,000,000.0         $ 1,600,000,000.0    
Number of years by which maturity date of credit facility may be extended           1 year    
Senior unsecured revolving credit facility | Minimum                
Debt Instrument [Line Items]                
Credit facility extensions available | extension           1    
Senior unsecured 364-day revolving credit facility                
Debt Instrument [Line Items]                
Committed borrowing capacity 1,000,000,000.0         $ 1,000,000,000.0    
Senior notes                
Debt Instrument [Line Items]                
Debt instrument face value 9,000,000,000         $ 9,000,000,000 $ 10,300,000,000  
6.13% senior notes due January 2017 | Senior notes                
Debt Instrument [Line Items]                
Repayments of senior notes   $ 400,000,000            
Debt instrument, interest rate (as a percent)   6.13%         6.13%  
6.50% senior notes due May 2018 | Senior notes                
Debt Instrument [Line Items]                
Repayments of senior notes $ 600,000,000              
Debt instrument, interest rate (as a percent) 6.50%         6.50% 6.50%  
8.75% senior notes due May 2019 | Senior notes                
Debt Instrument [Line Items]                
Repayments of senior notes $ 350,000,000              
Debt instrument, interest rate (as a percent) 8.75%         8.75% 8.75%  
5.88% senior notes due August 2016 | Senior notes                
Debt Instrument [Line Items]                
Repayments of senior notes     $ 175,000,000          
Debt instrument, interest rate (as a percent)     5.88%          
5.25% senior notes due June 2015 | Senior notes                
Debt Instrument [Line Items]                
Repayments of senior notes         $ 150,000,000      
Debt instrument, interest rate (as a percent)         5.25%      
3.95% senior notes due September 2015 | Senior notes                
Debt Instrument [Line Items]                
Repayments of senior notes       $ 400,000,000        
Debt instrument, interest rate (as a percent)       3.95%        
4.50% senior notes due December 2026 | Senior notes                
Debt Instrument [Line Items]                
Debt instrument, interest rate (as a percent) 4.50%         4.50% 4.50%  
Offering price percentage             99.716%  
Debt instrument face value             $ 750,000,000  
4.65% senior notes due October 2025 | Senior notes                
Debt Instrument [Line Items]                
Debt instrument, interest rate (as a percent) 4.65%         4.65% 4.65% 4.65%
Offering price percentage               99.846%
Debt instrument face value               $ 1,000,000,000
Other income/(expense), net | Senior notes                
Debt Instrument [Line Items]                
Loss on early redemption of senior notes           $ 40,000,000    
Non-extending Lender | Senior secured hedged inventory facility                
Debt Instrument [Line Items]                
Committed borrowing capacity $ 60,000,000         60,000,000    
Non-extending Lender | Senior unsecured revolving credit facility                
Debt Instrument [Line Items]                
Committed borrowing capacity $ 120,000,000         $ 120,000,000    
Consolidated finance subsidiary co-issuer | Senior notes                
Debt Instrument [Line Items]                
Consolidated subsidiary, ownership interest held by the parent (as a percent)           100.00%