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Long-Term Debt - Additional Information (Details)
1 Months Ended
Oct. 31, 2016
USD ($)
May 31, 2016
USD ($)
extension
Oct. 04, 2017
USD ($)
Sep. 30, 2017
USD ($)
Aug. 31, 2017
USD ($)
Aug. 28, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2014
USD ($)
Nov. 30, 2012
USD ($)
Debt Instrument [Line Items]                  
Borrowings outstanding       $ 25,847,000,000     $ 8,838,000,000    
Senior Notes                  
Debt Instrument [Line Items]                  
Face amount of notes         $ 16,000,000,000 $ 1,000,000,000   $ 6,000,000,000 $ 3,000,000,000
Borrowings outstanding       25,300,000,000          
Unamortized discount       100,000,000     90,000,000    
Estimated fair value of notes       26,200,000,000     8,700,000,000    
Line of Credit and Other Long-term Debt                  
Debt Instrument [Line Items]                  
Borrowings outstanding       597,000,000     588,000,000    
Credit Facility | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Borrowings outstanding       550,000,000     495,000,000    
Credit Facility | Revolving Credit Facility | October 2016 Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Maximum Borrowing Capacity $ 500,000,000                
Credit term 3 years                
Commitment fee percentage 0.50%                
Borrowings outstanding       $ 550,000,000     $ 495,000,000    
Weighted average interest rate       2.60%     2.30%    
Collateral amount       $ 639,000,000     $ 579,000,000    
Credit Facility | Revolving Credit Facility | October 2016 Revolving Credit Facility | LIBOR                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (as a percent) 1.65%                
Credit Facility | Revolving Credit Facility | May 2016 Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Maximum Borrowing Capacity   $ 3,000,000,000              
Credit term   3 years              
Commitment fee percentage   0.05%              
Borrowings outstanding       0     0    
Credit Agreement, number of extensions | extension   3              
Credit Agreement, additional term   1 year              
Credit Facility | Revolving Credit Facility | May 2016 Revolving Credit Facility | Downgraded Credit Ratings                  
Debt Instrument [Line Items]                  
Commitment fee percentage   0.09%              
Credit Facility | Revolving Credit Facility | May 2016 Revolving Credit Facility | LIBOR                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (as a percent)   0.60%              
Credit Facility | Revolving Credit Facility | May 2016 Revolving Credit Facility | LIBOR | Downgraded Credit Ratings                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (as a percent)   1.00%              
Other Long-term Debt                  
Debt Instrument [Line Items]                  
Borrowings outstanding       $ 47,000,000     $ 93,000,000    
Weighted average interest rate       1.90%     3.40%    
Subsequent Event [Member] | Credit Facility | Revolving Credit Facility | October 2016 Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Maximum Borrowing Capacity     $ 600,000,000