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Investments - Unrealized Loss Position Maturities (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Fair Value    
Less than one year $ 1,048  
One year through five years 6,507  
After five years through ten years 3,552  
Greater than ten years 3,310  
Fair Value 18,176 $ 18,492
Unrealized Losses    
Less than one year 20  
One year through five years 423  
After five years through ten years 395  
Greater than ten years 597  
Unrealized Losses 1,735 1,840
Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 730  
Fair Value 730 721
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 103  
Unrealized Losses 103 89
Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 875  
Fair Value 875 992
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 151  
Unrealized Losses 151 155
Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 2,154  
Fair Value 2,154 2,587
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 46  
Unrealized Losses 46 $ 136
Supporting experience-rated products    
Fair Value    
Less than one year 16  
One year through five years 151  
After five years through ten years 113  
Greater than ten years 206  
Fair Value 528  
Unrealized Losses    
Less than one year 1  
One year through five years 7  
After five years through ten years 14  
Greater than ten years 37  
Unrealized Losses 63  
Supporting experience-rated products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 8  
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 16  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 2  
Supporting experience-rated products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 18  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 1  
Supporting remaining products    
Fair Value    
Less than one year 1,032  
One year through five years 6,356  
After five years through ten years 3,439  
Greater than ten years 3,104  
Fair Value 17,648  
Unrealized Losses    
Less than one year 19  
One year through five years 416  
After five years through ten years 381  
Greater than ten years 560  
Unrealized Losses 1,672  
Supporting remaining products | Residential mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 722  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 102  
Supporting remaining products | Commercial mortgage-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 859  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses 149  
Supporting remaining products | Other asset-backed securities    
Fair Value    
Debt securities, maturity, without single maturity date, fair value 2,136  
Unrealized Losses    
Debt securities, maturity, without single maturity date, unrealized losses $ 45