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Related Party - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Other Affiliates            
Related Party Transaction [Line Items]            
Revenue with affiliated entities $ 22 $ 23   $ 64 $ 67  
Expenses with affiliated entities 136 $ 141   429 $ 456  
Affiliated Entity            
Related Party Transaction [Line Items]            
Reinsurance, Loss on Uncollectible Accounts in Period, Amount     $ (20)      
Deposit assets 0     0   $ 36
Deposit Liability, Current $ 0     $ 0   $ 76