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Subsequent Events Subsequent Events - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jul. 07, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Subsequent Event [Line Items]        
Long-term Debt, Gross   $ 6,886    
Proceeds from Issuance of Long-term Debt   285 $ 80  
Debt Instrument, Unamortized Discount   94   $ 110
Variable Interest Entity, Primary Beneficiary [Member] | CGP        
Subsequent Event [Line Items]        
Long-term Debt, Gross   2,322    
CBAC | Senior Secured Term Loan Facility | Variable Interest Entity, Primary Beneficiary [Member] | CGP        
Subsequent Event [Line Items]        
Debt Instrument, Unamortized Discount   $ 9    
CBAC | Senior Secured Term Loan Facility | Variable Interest Entity, Primary Beneficiary [Member] | CGP | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Long-term Debt, Gross $ 300      
Proceeds from Issuance of Long-term Debt $ 15      
CBAC | Senior Secured Term Loan Facility | London Interbank Offered Rate (LIBOR) [Member] | Variable Interest Entity, Primary Beneficiary [Member] | CGP        
Subsequent Event [Line Items]        
Debt Instrument, Basis Spread on Variable Rate   7.00%    
CBAC | Senior Secured Term Loan Facility | London Interbank Offered Rate (LIBOR) [Member] | Variable Interest Entity, Primary Beneficiary [Member] | CGP | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 4.00%      
CBAC | Senior Secured Revolving Credit Facility | Variable Interest Entity, Primary Beneficiary [Member] | CGP | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 15