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Debt - Unsecured Senior Notes and Interest Expense and Financing Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 16, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]        
Amount outstanding   $ 2,700 $ 4,440  
Loss on extinguishment of debt   40 12 $ 92
Interest expense   134 150 197
Amortization of debt discount and deferred financing costs   6 12 $ 20
Notes        
Debt Instrument [Line Items]        
Accrued interest payable   $ 15 28  
Unsecured Notes        
Debt Instrument [Line Items]        
Redemption percentage of aggregate principal amount plus a make-whole premium   100.00%    
Redemption price percentage   100.00%    
Percentage of principal repayable to option holders upon certain criteria   101.00%    
Unsecured Notes | 2023 Notes        
Debt Instrument [Line Items]        
Amount outstanding     $ 750  
Interest rate     6.125%  
Loss on extinguishment of debt   $ 33    
Redemption price percentage 100.00%      
Premium paid   25    
Write-off of unamortized discount and deferred financing costs   8    
Unsecured Notes | 2021 Notes        
Debt Instrument [Line Items]        
Amount outstanding   $ 650 $ 650  
Interest rate   2.30% 2.30%  
Unsecured Notes | 2026 Notes        
Debt Instrument [Line Items]        
Amount outstanding   $ 850 $ 850  
Interest rate   3.40% 3.40%  
Unsecured Notes | 2022 Notes        
Debt Instrument [Line Items]        
Amount outstanding   $ 400 $ 400  
Interest rate   2.60% 2.60%  
Unsecured Notes | 2027 Notes        
Debt Instrument [Line Items]        
Amount outstanding   $ 400 $ 400  
Interest rate   3.40% 3.40%  
Unsecured Notes | 2047 Notes        
Debt Instrument [Line Items]        
Amount outstanding   $ 400 $ 400  
Interest rate   4.50% 4.50%