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Investments - Schedule of Consolidated Investments (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-sale securities |  |
Amortized Cost | $ 55,913 | $ 51,681
Allowance for Expected Credit Losses | (102) | (67)
Gross Unrealized Gains | 694 | 406
Gross Unrealized Losses | (3,004) | (3,802)
Fair Value/Carrying Value | 53,501 | 48,218
Asset-backed securities |  |
Available-for-sale securities |  |
Amortized Cost | 18,346 | 15,784
Allowance for Expected Credit Losses | (21) | (13)
Gross Unrealized Gains | 198 | 202
Gross Unrealized Losses | (258) | (317)
Fair Value/Carrying Value | 18,265 | 15,656
Commercial mortgage-backed securities |  |
Available-for-sale securities |  |
Amortized Cost | 5,525 | 5,379
Allowance for Expected Credit Losses | (55) | (49)
Gross Unrealized Gains | 67 | 53
Gross Unrealized Losses | (149) | (201)
Fair Value/Carrying Value | 5,388 | 5,182
Corporates |  |
Available-for-sale securities |  |
Amortized Cost | 25,578 | 24,425
Allowance for Expected Credit Losses | (25) | (5)
Gross Unrealized Gains | 339 | 108
Gross Unrealized Losses | (2,256) | (2,832)
Fair Value/Carrying Value | 23,636 | 21,696
Hybrids |  |
Available-for-sale securities |  |
Amortized Cost | 596 | 604
Allowance for Expected Credit Losses | 0 | 0
Gross Unrealized Gains | 5 | 6
Gross Unrealized Losses | (19) | (29)
Fair Value/Carrying Value | 582 | 581
Municipals |  |
Available-for-sale securities |  |
Amortized Cost | 1,618 | 1,638
Allowance for Expected Credit Losses | 0 | 0
Gross Unrealized Gains | 6 | 3
Gross Unrealized Losses | (211) | (255)
Fair Value/Carrying Value | 1,413 | 1,386
Residential mortgage-backed securities |  |
Available-for-sale securities |  |
Amortized Cost | 2,975 | 2,869
Allowance for Expected Credit Losses | (1) | 0
Gross Unrealized Gains | 68 | 32
Gross Unrealized Losses | (71) | (105)
Fair Value/Carrying Value | 2,971 | 2,796
U.S. Government |  |
Available-for-sale securities |  |
Amortized Cost | 899 | 645
Allowance for Expected Credit Losses | 0 | 0
Gross Unrealized Gains | 7 | 2
Gross Unrealized Losses | (3) | (10)
Fair Value/Carrying Value | 903 | 637
Foreign Governments |  |
Available-for-sale securities |  |
Amortized Cost | 376 | 337
Allowance for Expected Credit Losses | 0 | 0
Gross Unrealized Gains | 4 | 0
Gross Unrealized Losses | (37) | (53)
Fair Value/Carrying Value | $ 343 | $ 284

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