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Related Party Debt - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Line Of Credit Facility [Line Items]      
Interest and fee expenses $ 24 $ 20  
Interest paid 25 $ 20  
Long-term debt, carrying value 2,694   $ 2,694
Long-term debt, fair value 2,790   2,825
Borrowing capacity 3,590   3,590
Ten Year Fixed Facility | Revolving Credit Facility      
Line Of Credit Facility [Line Items]      
Borrowing capacity 600   600
Five Year Revolver due July 2023 | Revolving Credit Facility      
Line Of Credit Facility [Line Items]      
Borrowing capacity 760   760
Seven Year Fixed Facility | Revolving Credit Facility      
Line Of Credit Facility [Line Items]      
Borrowing capacity $ 600   $ 600