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Related Party - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 01, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Other Affiliates            
Related Party Transaction [Line Items]            
Revenue with affiliated entities   $ 23 $ 25 $ 68 $ 169  
Expenses with affiliated entities   118 $ 117 382 $ 428  
Affiliated Entity            
Related Party Transaction [Line Items]            
Pre-tax gain on recapture $ 74          
Deposit assets   36   36   $ 37
Deposit Liability, Current   $ 76   $ 76   $ 77