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Debt - Unsecured Senior Notes and Deferred Financing Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 19, 2016
Sep. 19, 2016
Aug. 23, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Feb. 23, 2016
Sep. 19, 2013
Debt Instrument [Line Items]                  
Amount outstanding       $ 4,940 $ 4,119        
Loss on extinguishment of debt       (92) 0 $ 0      
Write-off of unamortized discount and deferred financing costs     $ 10            
Debt discount and issuance costs       53 45        
Interest expense       197 193 201      
Amortization of debt discount and deferred financing costs       20 7 $ 7      
Original 2021 Notes                  
Debt Instrument [Line Items]                  
Amount outstanding                 $ 1,500
Interest rate                 5.625%
2023 Notes                  
Debt Instrument [Line Items]                  
Amount outstanding                 $ 750
Interest rate                 6.125%
Unsecured Notes                  
Debt Instrument [Line Items]                  
Percentage of principal repayable to option holders upon certain criteria             101.00%    
Unsecured Notes | Original 2021 Notes                  
Debt Instrument [Line Items]                  
Amount outstanding         1,500        
Extinguishment of total debt amount $ 1,600                
Loss on extinguishment of debt (82)                
Premium payment 63                
Write-off of unamortized discount and deferred financing costs $ 19                
Debt discount and issuance costs         22        
Unsecured Notes | 2023 Notes                  
Debt Instrument [Line Items]                  
Amount outstanding       $ 750 750        
Redemption percentage of aggregate principal amount plus a make-whole premium and accrued and unpaid interest   100.00%              
Maximum percentage of outstanding Notes that can be redeemed with net cash proceeds from one or more qualified equity offerings       35.00%          
Interest payable       $ 13          
Debt discount and issuance costs       11 12        
Unsecured Notes | New 2021 Notes                  
Debt Instrument [Line Items]                  
Amount outstanding   $ 650   650          
Interest rate   2.30%              
Redemption percentage of aggregate principal amount plus a make-whole premium and accrued and unpaid interest   100.00%              
Redemption percentage of aggregate principal amount plus accrued and unpaid interest   100.00%              
Debt discount and issuance costs       5          
Unsecured Notes | 2026 Notes                  
Debt Instrument [Line Items]                  
Amount outstanding   $ 850   850          
Interest rate   3.40%              
Redemption percentage of aggregate principal amount plus a make-whole premium and accrued and unpaid interest   100.00%              
Redemption percentage of aggregate principal amount plus accrued and unpaid interest   100.00%              
Debt discount and issuance costs       10          
Unsecured Notes | Original 2021 and 2023 Notes                  
Debt Instrument [Line Items]                  
Interest payable         $ 38        
Unsecured Notes | New 2021 and 2026 Notes                  
Debt Instrument [Line Items]                  
Interest payable       $ 12          
Unsecured Notes | New 2021 and 2026 Notes | Long-term debt, net                  
Debt Instrument [Line Items]                  
Debt discount and issuance costs   $ 17              
Credit Facilities | Tranche A Term Loan | Long-term debt, net                  
Debt Instrument [Line Items]                  
Debt discount and issuance costs               $ 38