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Investments - Consolidated Investments (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-sale securities |  |
Amortized Cost | $ 45,606 | $ 37,708
Allowance for Expected Credit Losses | (42) | (39)
Gross Unrealized Gains | 457 | 98
Gross Unrealized Losses | (3,648) | (4,672)
Fair Value/Carrying Value | 42,373 | 33,095
Asset-backed securities |  |
Available-for-sale securities |  |
Amortized Cost | 14,631 | 12,209
Allowance for Expected Credit Losses | (11) | (8)
Gross Unrealized Gains | 191 | 36
Gross Unrealized Losses | (469) | (770)
Fair Value/Carrying Value | 14,342 | 11,467
Commercial mortgage-backed securities |  |
Available-for-sale securities |  |
Amortized Cost | 4,797 | 3,337
Allowance for Expected Credit Losses | (22) | (1)
Gross Unrealized Gains | 23 | 11
Gross Unrealized Losses | (323) | (284)
Fair Value/Carrying Value | 4,475 | 3,063
Corporates |  |
Available-for-sale securities |  |
Amortized Cost | 20,133 | 17,396
Allowance for Expected Credit Losses | (6) | (22)
Gross Unrealized Gains | 186 | 32
Gross Unrealized Losses | (2,417) | (3,069)
Fair Value/Carrying Value | 17,896 | 14,337
Hybrids |  |
Available-for-sale securities |  |
Amortized Cost | 668 | 806
Allowance for Expected Credit Losses | 0 | 0
Gross Unrealized Gains | 3 | 9
Gross Unrealized Losses | (53) | (84)
Fair Value/Carrying Value | 618 | 731
Municipals |  |
Available-for-sale securities |  |
Amortized Cost | 1,826 | 1,749
Allowance for Expected Credit Losses | 0 | 0
Gross Unrealized Gains | 14 | 4
Gross Unrealized Losses | (229) | (293)
Fair Value/Carrying Value | 1,611 | 1,460
Residential mortgage-backed securities |  |
Available-for-sale securities |  |
Amortized Cost | 2,507 | 1,638
Allowance for Expected Credit Losses | (3) | (8)
Gross Unrealized Gains | 29 | 6
Gross Unrealized Losses | (104) | (109)
Fair Value/Carrying Value | 2,429 | 1,527
U.S. Government |  |
Available-for-sale securities |  |
Amortized Cost | 679 | 287
Allowance for Expected Credit Losses | 0 | 0
Gross Unrealized Gains | 8 | 0
Gross Unrealized Losses | (9) | (16)
Fair Value/Carrying Value | 678 | 271
Foreign Governments |  |
Available-for-sale securities |  |
Amortized Cost | 365 | 286
Allowance for Expected Credit Losses | 0 | 0
Gross Unrealized Gains | 3 | 0
Gross Unrealized Losses | (44) | (47)
Fair Value/Carrying Value | $ 324 | $ 239

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