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Investments - Rollforward of credit loss allowance for mortgage loans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Bank loans      
Rollforward of the valuation allowance on impaired mortgage loans      
Beginning balance $ 0    
Net increases related to credit losses (4)    
Reduction of allowance related to sales 3    
Write-offs 1    
Ending balance (16) $ 0  
Accounting Standards Update 2016-13 | Bank loans      
Rollforward of the valuation allowance on impaired mortgage loans      
Beginning balance (16)    
Ending balance   (16)  
Accounting Standards Update 2016-13 | Mortgage loans      
Rollforward of the valuation allowance on impaired mortgage loans      
Beginning balance (33)    
Ending balance   (33)  
Mortgage loans      
Rollforward of the valuation allowance on impaired mortgage loans      
Beginning balance (3)    
Net increases related to credit losses (37) 0 $ 0
Reduction of allowance related to sales 15    
Loans transferred due to reinsurance agreement with AAC (1)    
Write-offs 0    
Ending balance $ (59) $ (3)