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Reinsurance - GMIB Reinsurers (Details) - GMIB - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Ceded Credit Risk [Line Items]    
GMIB recoverables $ 758 $ 713
Berkshire    
Ceded Credit Risk [Line Items]    
GMIB recoverables $ 353 332
Berkshire | Secured | GMIB Assets    
Ceded Credit Risk [Line Items]    
Concentration percentage 100.00%  
Sun Life Assurance Company of Canada    
Ceded Credit Risk [Line Items]    
GMIB recoverables $ 215 202
Liberty Re (Bermuda) Ltd.    
Ceded Credit Risk [Line Items]    
GMIB recoverables $ 190 $ 179
Liberty Re (Bermuda) Ltd. | Secured | GMIB Assets    
Ceded Credit Risk [Line Items]    
Concentration percentage 100.00%