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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Other securities which provide for periodic payments, Amortized Cost $ 10,420  
Total fixed maturity available-for-sale securities, Amortized Cost 27,758 $ 25,577
Other securities which provide for periodic payments, Fair Value 11,184  
Total fixed maturity available-for-sale securities, Fair Value 29,511 27,587
Corporates, Non-structured Hybrids, Municipal and Government securities:    
Debt Securities, Available-for-sale [Line Items]    
Due in one year or less, Amortized Cost 456  
Due after one year through five years, Amortized Cost 2,761  
Due after five years through ten years, Amortized Cost 2,126  
Due after ten years, Amortized Cost 11,995  
Subtotal, Amortized Cost 17,338  
Due in one year or less, Fair Value 455  
Due after one year through five years, Fair Value 2,875  
Due after five years through ten years, Fair Value 2,235  
Due after ten years, Fair Value 12,762  
Subtotal, Fair Value 18,327  
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Other securities which provide for periodic payments, Amortized Cost 7,103  
Total fixed maturity available-for-sale securities, Amortized Cost 7,103 5,941
Other securities which provide for periodic payments, Fair Value 7,404  
Total fixed maturity available-for-sale securities, Fair Value 7,404 6,266
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Other securities which provide for periodic payments, Amortized Cost 2,518  
Total fixed maturity available-for-sale securities, Amortized Cost 2,518 2,490
Other securities which provide for periodic payments, Fair Value 2,946  
Total fixed maturity available-for-sale securities, Fair Value 2,946 $ 2,829
Structured hybrids    
Debt Securities, Available-for-sale [Line Items]    
Other securities which provide for periodic payments, Amortized Cost 26  
Other securities which provide for periodic payments, Fair Value 33  
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Other securities which provide for periodic payments, Amortized Cost 773  
Other securities which provide for periodic payments, Fair Value $ 801