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Schedule I - Summary of Investments Other Than investments in Related Parties (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Commercial mortgage and other loans [1] $ 59,305 $ 56,745
Fixed Maturities, available-for-sale, Amortized Cost 334,598 335,447
Fixed Maturities, available-for-sale, at fair value [1] 316,321 307,719
Equity securities, Fair Value [1] 8,242 7,150
Fixed Maturities, Trading, amortized cost 10,624 7,303
Fixed maturities, trading [1] 9,790 5,951
Assets supporting experience-rated contractholder liabilities, at amortized cost 2,496 2,612
Assets supporting experience-rated contractholder liabilities, at fair value 3,168 2,844
Commercial mortgage and other loans 59,305 56,745
Policy loans 10,047 10,046
Short-term investments (net of allowance for credit losses: 2023-$0; 2022-$6) 5,005 4,591
Other invested assets [1] 22,855 21,099
Total Investment at Cost 450,716  
Total investment 434,733 417,441
Fixed Maturities    
Schedule of Investments [Line Items]    
Assets supporting experience-rated contractholder liabilities, at amortized cost 889 984
Assets supporting experience-rated contractholder liabilities, at fair value 889 945
Equity securities    
Schedule of Investments [Line Items]    
Equity securities, at cost 5,786  
Equity securities, Fair Value 8,242  
Assets supporting experience-rated contractholder liabilities, at amortized cost 1,607 1,628
Assets supporting experience-rated contractholder liabilities, at fair value 2,279 1,899
Available-for-sale | Fixed Maturities    
Schedule of Investments [Line Items]    
Fixed Maturities, available-for-sale, Amortized Cost 334,598  
Fixed Maturities, available-for-sale, at fair value 316,321  
Trading | Fixed Maturities    
Schedule of Investments [Line Items]    
Fixed Maturities, Trading, amortized cost 10,624  
Fixed maturities, trading 9,790  
U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Schedule of Investments [Line Items]    
Fixed Maturities, available-for-sale, Amortized Cost 24,874 29,372
Fixed Maturities, available-for-sale, at fair value 21,796 26,069
U.S. Treasury securities and obligations of U.S. government authorities and agencies | Available-for-sale | Fixed Maturities    
Schedule of Investments [Line Items]    
Fixed Maturities, available-for-sale, Amortized Cost 24,874  
Fixed Maturities, available-for-sale, at fair value 21,796  
Obligations of U.S. states and their political subdivisions    
Schedule of Investments [Line Items]    
Fixed Maturities, available-for-sale, Amortized Cost 8,650 10,179
Fixed Maturities, available-for-sale, at fair value 8,458 9,689
Obligations of U.S. states and their political subdivisions | Available-for-sale | Fixed Maturities    
Schedule of Investments [Line Items]    
Fixed Maturities, available-for-sale, Amortized Cost 8,650  
Fixed Maturities, available-for-sale, at fair value 8,458  
Foreign governments | Available-for-sale | Fixed Maturities    
Schedule of Investments [Line Items]    
Fixed Maturities, available-for-sale, Amortized Cost 71,556  
Fixed Maturities, available-for-sale, at fair value 70,190  
Asset-backed securities    
Schedule of Investments [Line Items]    
Fixed Maturities, available-for-sale, Amortized Cost 12,514 12,972
Fixed Maturities, available-for-sale, at fair value 12,595 12,851
Asset-backed securities | Available-for-sale | Fixed Maturities    
Schedule of Investments [Line Items]    
Fixed Maturities, available-for-sale, Amortized Cost 12,514  
Fixed Maturities, available-for-sale, at fair value 12,595  
Residential mortgage-backed securities    
Schedule of Investments [Line Items]    
Fixed Maturities, available-for-sale, Amortized Cost 2,438 2,613
Fixed Maturities, available-for-sale, at fair value 2,265 2,417
Residential mortgage-backed securities | Available-for-sale | Fixed Maturities    
Schedule of Investments [Line Items]    
Fixed Maturities, available-for-sale, Amortized Cost 2,438  
Fixed Maturities, available-for-sale, at fair value 2,265  
Commercial Mortgage Backed Securities    
Schedule of Investments [Line Items]    
Fixed Maturities, available-for-sale, Amortized Cost 10,571 11,497
Fixed Maturities, available-for-sale, at fair value 9,892 $ 10,655
Commercial Mortgage Backed Securities | Available-for-sale | Fixed Maturities    
Schedule of Investments [Line Items]    
Fixed Maturities, available-for-sale, Amortized Cost 10,571  
Fixed Maturities, available-for-sale, at fair value 9,892  
Public utilities | Available-for-sale | Fixed Maturities    
Schedule of Investments [Line Items]    
Fixed Maturities, available-for-sale, Amortized Cost 32,600  
Fixed Maturities, available-for-sale, at fair value 30,327  
All other corporate bonds | Available-for-sale | Fixed Maturities    
Schedule of Investments [Line Items]    
Fixed Maturities, available-for-sale, Amortized Cost 171,017  
Fixed Maturities, available-for-sale, at fair value 160,383  
Redeemable preferred stock | Available-for-sale | Fixed Maturities    
Schedule of Investments [Line Items]    
Fixed Maturities, available-for-sale, Amortized Cost 378  
Fixed Maturities, available-for-sale, at fair value 415  
Other common stocks | Equity securities    
Schedule of Investments [Line Items]    
Equity securities, at cost 4,407  
Equity securities, Fair Value 6,142  
Mutual funds | Equity securities    
Schedule of Investments [Line Items]    
Equity securities, at cost 1,172  
Equity securities, Fair Value 1,859  
Nonredeemable preferred stock | Equity securities    
Schedule of Investments [Line Items]    
Equity securities, at cost 50  
Equity securities, Fair Value 72  
Perpetual preferred stock | Equity securities    
Schedule of Investments [Line Items]    
Equity securities, at cost 157  
Equity securities, Fair Value 169  
Commercial mortgage and agricultural properties loans and other collateralized loans    
Schedule of Investments [Line Items]    
Commercial mortgage and other loans 58,881  
Uncollateralized loans    
Schedule of Investments [Line Items]    
Commercial mortgage and other loans $ 424  
[1] See Note 4 for details of balances associated with variable interest entities.