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Investments - Schedule of Consolidated Investments (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-sale securities |  |
Amortized Cost | $ 51,070 | $ 45,606
Allowance for Expected Credit Losses | (67) | (42)
Gross Unrealized Gains | 822 | 457
Gross Unrealized Losses | (2,885) | (3,648)
Fair Value/Carrying Value | 48,940 | 42,373
Asset-backed securities |  |
Available-for-sale securities |  |
Amortized Cost | 15,986 | 14,631
Allowance for Expected Credit Losses | (12) | (11)
Gross Unrealized Gains | 264 | 191
Gross Unrealized Losses | (275) | (469)
Fair Value/Carrying Value | 15,963 | 14,342
Commercial mortgage-backed securities |  |
Available-for-sale securities |  |
Amortized Cost | 5,359 | 4,797
Allowance for Expected Credit Losses | (49) | (22)
Gross Unrealized Gains | 61 | 23
Gross Unrealized Losses | (192) | (323)
Fair Value/Carrying Value | 5,179 | 4,475
Corporates |  |
Available-for-sale securities |  |
Amortized Cost | 23,673 | 20,133
Allowance for Expected Credit Losses | (5) | (6)
Gross Unrealized Gains | 396 | 186
Gross Unrealized Losses | (2,092) | (2,417)
Fair Value/Carrying Value | 21,972 | 17,896
Hybrids |  |
Available-for-sale securities |  |
Amortized Cost | 609 | 668
Allowance for Expected Credit Losses | 0 | 0
Gross Unrealized Gains | 6 | 3
Gross Unrealized Losses | (19) | (53)
Fair Value/Carrying Value | 596 | 618
Municipals |  |
Available-for-sale securities |  |
Amortized Cost | 1,682 | 1,826
Allowance for Expected Credit Losses | 0 | 0
Gross Unrealized Gains | 20 | 14
Gross Unrealized Losses | (187) | (229)
Fair Value/Carrying Value | 1,515 | 1,611
Residential mortgage-backed securities |  |
Available-for-sale securities |  |
Amortized Cost | 2,617 | 2,507
Allowance for Expected Credit Losses | (1) | (3)
Gross Unrealized Gains | 61 | 29
Gross Unrealized Losses | (77) | (104)
Fair Value/Carrying Value | 2,600 | 2,429
U.S. Government |  |
Available-for-sale securities |  |
Amortized Cost | 800 | 679
Allowance for Expected Credit Losses | 0 | 0
Gross Unrealized Gains | 9 | 8
Gross Unrealized Losses | (6) | (9)
Fair Value/Carrying Value | 803 | 678
Foreign Governments |  |
Available-for-sale securities |  |
Amortized Cost | 344 | 365
Allowance for Expected Credit Losses | 0 | 0
Gross Unrealized Gains | 5 | 3
Gross Unrealized Losses | (37) | (44)
Fair Value/Carrying Value | $ 312 | $ 324

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