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Debt (Textuals) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 01, 2020
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2019
Jun. 30, 2016
Sep. 30, 2014
Debt Instrument [Line Items]                
Repayments of Unsecured Debt     $ 768 $ 355 $ 453      
Debt Instrument, Interest Rate, Effective Percentage   5.80% 5.80% 5.70%        
Gains (Losses) on Extinguishment of Debt     $ (58) $ 28 (38)      
Senior Unsecured Notes 2028 [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Effective Percentage [1]   5.30% 5.30% 0.00%        
Debt Instrument, Face Amount   $ 1,400 $ 1,400          
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Repayment time for drawings under letters of credit     2 days          
Revolving Credit Facility [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Applicable margin range percentage above base rate     1.00%          
Applicable Margin Range Percentage Above British Bankers' Association Interest Settlement Rates     2.00%          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.25%          
Revolving Credit Facility [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Applicable margin range percentage above base rate     1.25%          
Applicable Margin Range Percentage Above British Bankers' Association Interest Settlement Rates     2.25%          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.50%          
2023 First Lien Term Loan [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Effective Percentage [2]   0.00% 0.00% 5.40%        
CDHI [Member]                
Debt Instrument [Line Items]                
Letter of Credit Total   $ 300 $ 300          
2026 First Lien Notes [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Effective Percentage [3]   5.50% 5.50% 5.50%        
Debt Instrument, Face Amount         $ 560   $ 625  
Senior Unsecured Notes 2023 [Member]                
Debt Instrument [Line Items]                
Repayments of Unsecured Debt   $ (613)            
Debt Instrument, Interest Rate, Effective Percentage [1]   5.70% 5.70% 5.60%        
Gains (Losses) on Extinguishment of Debt   $ 24 $ 0 $ 1        
Debt Instrument, Face Amount               $ 1,250
Redemption Premium   18            
Write off of Deferred Debt Issuance Cost   6            
Russell City and Los Esteros Project Debt [Member]                
Debt Instrument [Line Items]                
Long-term Debt, Excluding Current Maturities   304 $ 304          
One Month [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Interest periods for LIBOR rate borrowings     1 month          
Two Months [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Interest periods for LIBOR rate borrowings     2 months          
Three Months [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Interest periods for LIBOR rate borrowings     3 months          
Six Months [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Interest periods for LIBOR rate borrowings     6 months          
Nine Months [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Interest periods for LIBOR rate borrowings     9 months          
Twelve Months [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Interest periods for LIBOR rate borrowings     12 months          
Federal Funds Effective Rate [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Basis Spread on Variable Rate     0.50%          
CDHI [Member]                
Debt Instrument [Line Items]                
Future Line of Credit Facility Maximum Borrowing Capacity   125 $ 125          
Applicable margin range percentage above base rate     1.75%          
Applicable Margin Range Percentage Above British Bankers' Association Interest Settlement Rates     2.75%          
Other Corporate Facilities [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity   300 $ 300          
Other Corporate Facilities [Member] | Goldman Sachs [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity   150 150          
Other Corporate Facilities [Member] | Citi Bank [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity   $ 50 $ 50          
Revolving Credit Facility [Member] | Amendment No. 8 [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity           $ 1,690    
Subsequent Event [Member] | Senior Unsecured Notes 2023 [Member]                
Debt Instrument [Line Items]                
Repayments of Unsecured Debt $ (623)              
[1] Our weighted average interest rate calculation includes the amortization of debt issuance costs.
[2] Our weighted average interest rate calculation includes the amortization of debt issuance costs and debt discount.
[3] Our weighted average interest rate calculation includes the amortization of debt issuance costs and debt discount.