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Related Party - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Other Affiliates            
Related Party Transaction [Line Items]            
Revenue with affiliated entities $ 19   $ 22 $ 42 $ 44  
Expenses with affiliated entities 139   $ 169 293 $ 315  
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