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Related Party - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 01, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Other Affiliates            
Related Party Transaction [Line Items]            
Revenue with affiliated entities   $ 23 $ 58 $ 45 $ 144  
Expenses with affiliated entities   118 $ 143 264 $ 311  
Affiliated Entity            
Related Party Transaction [Line Items]            
Pre-tax gain on recapture $ 74          
Deposit assets   37   37   $ 37
Deposit liabilities   $ 77   $ 77   $ 77