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Investments (Assets Supporting Experience-Rated Contractholder Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost $ 22,809 $ 22,438
Assets supporting experience-rated contractholder liabilities, at fair value [1] 24,027 24,115
Fixed maturities    
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost 20,438 20,119
Assets supporting experience-rated contractholder liabilities, at fair value 21,302 21,414
Equity securities    
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost 1,942 1,661
Assets supporting experience-rated contractholder liabilities, at fair value 2,296 2,043
Short-term investments and cash equivalents    
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost 429 658
Assets supporting experience-rated contractholder liabilities, at fair value 429 658
Corporate securities | Fixed maturities    
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost 14,470 14,442
Assets supporting experience-rated contractholder liabilities, at fair value 15,130 15,472
Commercial mortgage-backed securities | Fixed maturities    
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost 1,699 1,743
Assets supporting experience-rated contractholder liabilities, at fair value 1,773 1,839
Residential mortgage-backed securities | Fixed maturities    
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost 873 964
Assets supporting experience-rated contractholder liabilities, at fair value 915 1,018
Asset-backed securities | Fixed maturities    
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost 2,039 1,665
Assets supporting experience-rated contractholder liabilities, at fair value 2,066 1,697
Foreign government bonds | Fixed maturities    
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost 994 934
Assets supporting experience-rated contractholder liabilities, at fair value 996 945
U.S. government authorities and agencies and obligations of U.S. states | Fixed maturities    
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost 363 371
Assets supporting experience-rated contractholder liabilities, at fair value $ 422 $ 443
Public Securities    
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost percentage 79.00% 79.00%
Collateralized loan obligations    
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items]    
Assets supporting experience-rated contractholder liabilities, at fair value $ 1,530 $ 1,102
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 94.00% 94.00%
[1] See Note 4 for details of balances associated with variable interest entities.