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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.

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