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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Fair Value    
Less than one year $ 1,222  
One year through five years 5,363  
After five years through ten years 3,291  
Greater than ten years 3,032  
Fair Value 16,946 $ 18,492
Unrealized Losses    
Less than one year 18  
One year through five years 333  
After five years through ten years 358  
Greater than ten years 377  
Unrealized Losses 1,393 1,840
Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 723  
Fair Value 723 721
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 71  
Unrealized Losses 71 89
Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 932  
Fair Value 932 992
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 146  
Unrealized Losses 146 155
Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 2,383  
Fair Value 2,383 2,587
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 90  
Unrealized Losses 90 $ 136
Supporting experience-rated products    
Fair Value    
Less than one year 22  
One year through five years 125  
After five years through ten years 120  
Greater than ten years 197  
Fair Value 515  
Unrealized Losses    
Less than one year 0  
One year through five years 3  
After five years through ten years 12  
Greater than ten years 20  
Unrealized Losses 40  
Supporting experience-rated products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 11  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 1  
Supporting experience-rated products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 23  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 3  
Supporting experience-rated products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 17  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 1  
Supporting remaining products    
Fair Value    
Less than one year 1,200  
One year through five years 5,238  
After five years through ten years 3,171  
Greater than ten years 2,835  
Fair Value 16,431  
Unrealized Losses    
Less than one year 18  
One year through five years 330  
After five years through ten years 346  
Greater than ten years 357  
Unrealized Losses 1,353  
Supporting remaining products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 712  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 70  
Supporting remaining products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 909  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 143  
Supporting remaining products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 2,366  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 89