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Debt (Details)
$ in Millions
12 Months Ended
Feb. 25, 2016
USD ($)
Feb. 23, 2016
USD ($)
amendment
Feb. 11, 2015
USD ($)
Feb. 11, 2014
USD ($)
Oct. 11, 2013
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 19, 2013
USD ($)
Debt Instrument [Line Items]                  
Repayment of long-term debt           $ 250 $ 375 $ 6  
Long-term debt           $ 4,119 4,369    
Maximum percentage of outstanding Notes that can be redeemed with net cash proceeds from one or more qualified equity offerings           35.00%      
Percentage of principal repayable to option holders upon certain criteria           101.00%      
Interest expense           $ 193 201    
Amortization of the debt discount           6 6    
Credit Facilities | Subsequent Events                  
Debt Instrument [Line Items]                  
Number of amendments to the Credit Agreement | amendment   3              
Term Loan | Credit Facilities | Subsequent Events                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity $ 3,700 $ 2,300              
Federal Funds Effective Rate | Term Loan | Credit Facilities | Subsequent Events                  
Debt Instrument [Line Items]                  
Applicable margin (as a percent)   0.50%              
Term Loan                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity         $ 2,500        
LIBOR floor rate         0.75%        
Required quarterly payments, percentage of original principal         0.25%        
Repayment of long-term debt     $ 250 $ 375          
Long-term debt           1,869 2,119    
Term Loan | Subsequent Events                  
Debt Instrument [Line Items]                  
Repayment of long-term debt $ 500                
Revolver                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity         $ 250        
Amount of letters of credit that can be issued under the Revolver         $ 50 $ 50      
Percentage of Revolver outstanding which triggers certain financial covenants           15.00%      
Commitment fees           $ 0 0    
Credit Facilities                  
Debt Instrument [Line Items]                  
Variable rate at end of period           3.25%      
Percentage of consolidated total assets pledged as collateral           67.00%      
Credit Facilities | Prime Rate | Base Rate Loans                  
Debt Instrument [Line Items]                  
Description of variable rate basis         Prime rate as designated by the administrative agent        
Credit Facilities | Federal Funds Effective Rate | Base Rate Loans                  
Debt Instrument [Line Items]                  
Description of variable rate basis         federal funds rate        
Applicable margin (as a percent)         0.50%        
Credit Facilities | LIBOR Rate | Base Rate Loans                  
Debt Instrument [Line Items]                  
Description of variable rate basis         LIBOR for one month        
Applicable margin (as a percent)         1.00%        
Credit Facilities | LIBOR Rate | LIBOR Rate Loans                  
Debt Instrument [Line Items]                  
Description of variable rate basis         LIBOR        
Unsecured Notes                  
Debt Instrument [Line Items]                  
Interest payable           $ 38 38    
2021 Notes                  
Debt Instrument [Line Items]                  
Long-term debt           1,500 1,500   $ 1,500
Interest rate                 5.625%
2021 Notes | Fair value measurements using significant other observable inputs (Level 2)                  
Debt Instrument [Line Items]                  
Fair value of notes           1,571 1,586    
2023 Notes                  
Debt Instrument [Line Items]                  
Long-term debt           750 750   $ 750
Interest rate                 6.125%
2023 Notes | Fair value measurements using significant other observable inputs (Level 2)                  
Debt Instrument [Line Items]                  
Fair value of notes           $ 795 $ 810