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Investments - Consolidated Investments (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-sale securities |  |
Amortized Cost | $ 47,789 | $ 45,606
Allowance for Expected Credit Losses | (40) | (42)
Gross Unrealized Gains | 500 | 457
Gross Unrealized Losses | (3,683) | (3,648)
Fair Value/Carrying Value | 44,566 | 42,373
Asset-backed securities |  |
Available-for-sale securities |  |
Amortized Cost | 15,254 | 14,631
Allowance for Expected Credit Losses | (11) | (11)
Gross Unrealized Gains | 280 | 191
Gross Unrealized Losses | (408) | (469)
Fair Value/Carrying Value | 15,115 | 14,342
Commercial mortgage-backed securities |  |
Available-for-sale securities |  |
Amortized Cost | 5,040 | 4,797
Allowance for Expected Credit Losses | (21) | (22)
Gross Unrealized Gains | 38 | 23
Gross Unrealized Losses | (239) | (323)
Fair Value/Carrying Value | 4,818 | 4,475
Corporates |  |
Available-for-sale securities |  |
Amortized Cost | 21,430 | 20,133
Allowance for Expected Credit Losses | (7) | (6)
Gross Unrealized Gains | 133 | 186
Gross Unrealized Losses | (2,585) | (2,417)
Fair Value/Carrying Value | 18,971 | 17,896
Hybrids |  |
Available-for-sale securities |  |
Amortized Cost | 667 | 668
Allowance for Expected Credit Losses | 0 | 0
Gross Unrealized Gains | 4 | 3
Gross Unrealized Losses | (38) | (53)
Fair Value/Carrying Value | 633 | 618
Municipals |  |
Available-for-sale securities |  |
Amortized Cost | 1,773 | 1,826
Allowance for Expected Credit Losses | 0 | 0
Gross Unrealized Gains | 11 | 14
Gross Unrealized Losses | (237) | (229)
Fair Value/Carrying Value | 1,547 | 1,611
Residential mortgage-backed securities |  |
Available-for-sale securities |  |
Amortized Cost | 2,550 | 2,507
Allowance for Expected Credit Losses | (1) | (3)
Gross Unrealized Gains | 31 | 29
Gross Unrealized Losses | (116) | (104)
Fair Value/Carrying Value | 2,464 | 2,429
U.S. Government |  |
Available-for-sale securities |  |
Amortized Cost | 706 | 679
Allowance for Expected Credit Losses | 0 | 0
Gross Unrealized Gains | 3 | 8
Gross Unrealized Losses | (11) | (9)
Fair Value/Carrying Value | 698 | 678
Foreign Governments |  |
Available-for-sale securities |  |
Amortized Cost | 369 | 365
Allowance for Expected Credit Losses | 0 | 0
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | (49) | (44)
Fair Value/Carrying Value | $ 320 | $ 324

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