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Investments (Assets Supporting Experience-Rated Contractholder Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost $ 2,496 $ 2,612
Assets supporting experience-rated contractholder liabilities, at fair value 3,168 2,844
Fixed maturities    
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost 889 984
Assets supporting experience-rated contractholder liabilities, at fair value 889 945
Equity securities    
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost 1,607 1,628
Assets supporting experience-rated contractholder liabilities, at fair value 2,279 1,899
Corporate securities    
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost 81 91
Assets supporting experience-rated contractholder liabilities, at fair value 79 88
Foreign government bonds    
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost 606 705
Assets supporting experience-rated contractholder liabilities, at fair value 604 668
Obligations of U.S. government authorities and agencies and obligations of U.S. states    
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost 202 188
Assets supporting experience-rated contractholder liabilities, at fair value $ 206 $ 189
NAIC High or Highest Quality Rating | Fixed maturities    
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost percentage 99.00% 98.00%