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Fair Value of Financial Instruments - Schedule of Changes to Fair Value of Financial Instruments Level 3 (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jul. 17, 2024
Liabilities |  |  |  |  |
Liabilities, Total (Losses) Gains Included in Earnings | $ 180 | $ 314 | $ 325 | $ 501 |
Liabilities, Purchases | 315 | 390 | 899 | 1,059 |
Liabilities, Sales | 0 | 0 | 0 | 0 |
Liabilities, Settlements | (133) | (135) | (357) | (310) |
Liabilities, Net transfer In (Out) of Level 3 | 0 | (28) | 0 | (28) |
PALH LLC |  |  |  |  |
Liabilities |  |  |  |  |
Business combination, achieved in stages, preacquisition equity interest in acquiree, percentage |  |  |  |  | 30.00%
Level 3 |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 13,272 | 11,068 | 11,734 | 9,677 |
Balance at End of Period | 13,602 | 11,596 | 13,602 | 11,596 |
Liabilities |  |  |  |  |
Balance at Beginning of Period | 6,510 | 5,398 | 5,843 | 4,661 |
Balance at End of Period | 6,991 | 6,083 | 6,991 | 6,083 |
Indexed annuities/indexed universal life insurance ("IUL") embedded derivatives, included in Contractholder funds |  |  |  |  |
Liabilities |  |  |  |  |
Balance at Beginning of Period | 5,727 | 4,848 | 5,220 | 4,258 |
Liabilities, Total (Losses) Gains Included in Earnings | 174 | 308 | 309 | 452 |
Liabilities, Purchases | 315 | 390 | 899 | 1,011 |
Liabilities, Sales | 0 | 0 | 0 | 0 |
Liabilities, Settlements | (133) | (135) | (345) | (310) |
Liabilities, Net transfer In (Out) of Level 3 | 0 | 0 | 0 | 0 |
Balance at End of Period | 6,083 | 5,411 | 6,083 | 5,411 |
Change in Unrealized Gains (Losses) Included in OCI | $ 0 | $ 0 | $ 0 | $ 0 |
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income Flag | Recognized gains and losses, net | Recognized gains and losses, net | Recognized gains and losses, net | Recognized gains and losses, net |
Interest rate swaps, included in Accounts payable and accrued liabilities |  |  |  |  |
Liabilities |  |  |  |  |
Balance at Beginning of Period |  | $ 28 |  | $ 0 |
Liabilities, Total (Losses) Gains Included in Earnings |  | 0 |  | 28 |
Liabilities, Purchases |  | 0 |  | 0 |
Liabilities, Sales |  | 0 |  | 0 |
Liabilities, Settlements |  | 0 |  | 0 |
Liabilities, Net transfer In (Out) of Level 3 |  | (28) |  | (28) |
Balance at End of Period |  | 0 |  | 0 |
Change in Unrealized Gains (Losses) Included in OCI |  |  |  | 0 |
Foreign currency swaps |  |  |  |  |
Liabilities |  |  |  |  |
Balance at Beginning of Period | $ 5 |  | $ 0 |  |
Liabilities, Total (Losses) Gains Included in Earnings | 1 |  | 6 |  |
Liabilities, Purchases | 0 |  | 0 |  |
Liabilities, Sales | 0 |  | 0 |  |
Liabilities, Settlements | 0 |  | 0 |  |
Liabilities, Net transfer In (Out) of Level 3 | 0 |  | 0 |  |
Balance at End of Period | 6 |  | 6 |  |
Change in Unrealized Gains (Losses) Included in OCI | 0 |  | 0 |  |
Contingent consideration |  |  |  |  |
Liabilities |  |  |  |  |
Balance at Beginning of Period | 67 | 63 | 74 | 0 |
Liabilities, Total (Losses) Gains Included in Earnings | 5 | 6 | 10 | 21 |
Liabilities, Purchases | 0 | 0 | 0 | 48 |
Liabilities, Sales | 0 | 0 | 0 | 0 |
Liabilities, Settlements | 0 | 0 | (12) | 0 |
Liabilities, Net transfer In (Out) of Level 3 | 0 | 0 | 0 | 0 |
Balance at End of Period | 72 | 69 | 72 | 69 |
Change in Unrealized Gains (Losses) Included in OCI | 0 | 0 | 0 | 0 |
Asset-backed securities |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 9,361 | 8,042 | 8,143 | 7,122 |
Assets, Total (Losses) Gains Included in Earnings | (2) | (3) | (5) | 12 |
Assets, Total (Losses) Gains Included in AOCI | 65 | 77 | 95 | 187 |
Assets, Purchases | 863 | 515 | 2,586 | 1,981 |
Assets, Sales | (119) | (30) | (317) | (109) |
Assets, Settlements | (483) | (358) | (882) | (904) |
Assets, Net transfer In (Out) of Level 3 | (216) | (59) | (151) | (105) |
Balance at End of Period | 9,469 | 8,184 | 9,469 | 8,184 |
Change in Unrealized Included in OCI | 59 | 77 | 88 | 184 |
Commercial mortgage-backed securities |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 3 | 15 | 0 | 18 |
Assets, Total (Losses) Gains Included in Earnings | 0 | 0 | 0 | 0 |
Assets, Total (Losses) Gains Included in AOCI | 0 | 0 | 0 | 0 |
Assets, Purchases | 43 | 0 | 46 | 58 |
Assets, Sales | 0 | 0 | 0 | 0 |
Assets, Settlements | 0 | 0 | 0 | 0 |
Assets, Net transfer In (Out) of Level 3 | (3) | (15) | (3) | (76) |
Balance at End of Period | 43 | 0 | 43 | 0 |
Change in Unrealized Included in OCI | 0 | 0 | 0 | 0 |
Corporates |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 3,165 | 2,355 | 2,957 | 1,979 |
Assets, Total (Losses) Gains Included in Earnings | 2 | (2) | (14) | (2) |
Assets, Total (Losses) Gains Included in AOCI | 35 | 67 | 76 | 79 |
Assets, Purchases | 442 | 354 | 1,161 | 873 |
Assets, Sales | (214) | 0 | (542) | (96) |
Assets, Settlements | (112) | (43) | (317) | (85) |
Assets, Net transfer In (Out) of Level 3 | 0 | (3) | (3) | (20) |
Balance at End of Period | 3,318 | 2,728 | 3,318 | 2,728 |
Change in Unrealized Included in OCI | 36 | 64 | 76 | 77 |
Hybrids |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 5 |  | 0 |  |
Assets, Total (Losses) Gains Included in Earnings | 0 |  | 0 |  |
Assets, Total (Losses) Gains Included in AOCI | 1 |  | 0 |  |
Assets, Purchases | 9 |  | 15 |  |
Assets, Sales | 0 |  | 0 |  |
Assets, Settlements | 0 |  | 0 |  |
Assets, Net transfer In (Out) of Level 3 | 0 |  | 0 |  |
Balance at End of Period | 15 |  | 15 |  |
Change in Unrealized Included in OCI | 0 |  | 0 |  |
Municipals |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 3 |  | 0 | 49 |
Assets, Total (Losses) Gains Included in Earnings | 0 |  | 0 | 0 |
Assets, Total (Losses) Gains Included in AOCI | 0 |  | 0 | 1 |
Assets, Purchases | 0 |  | 4 | 0 |
Assets, Sales | 0 |  | 0 | (50) |
Assets, Settlements | 0 |  | (1) | 0 |
Assets, Net transfer In (Out) of Level 3 | 0 |  | 0 | 0 |
Balance at End of Period | 3 | 0 | 3 | 0 |
Change in Unrealized Included in OCI | 0 |  | 0 | 1 |
Residential mortgage-backed securities |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 5 | 3 | 3 | 3 |
Assets, Total (Losses) Gains Included in Earnings | 0 | 0 | 0 | 0 |
Assets, Total (Losses) Gains Included in AOCI | 0 | 0 | 0 | 0 |
Assets, Purchases | 0 | 0 | 2 | 1 |
Assets, Sales | 0 | 0 | 0 | 0 |
Assets, Settlements | 0 | 0 | 0 | 0 |
Assets, Net transfer In (Out) of Level 3 | (2) | 0 | (2) | (1) |
Balance at End of Period | 3 | 3 | 3 | 3 |
Change in Unrealized Included in OCI | 0 | 0 | 0 | 0 |
Foreign Governments |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 23 | 5 | 4 | 16 |
Assets, Total (Losses) Gains Included in Earnings | 0 | 0 | 0 | 0 |
Assets, Total (Losses) Gains Included in AOCI | 2 | 0 | 2 | 0 |
Assets, Purchases | 0 | 0 | 19 | 0 |
Assets, Sales | 0 | 0 | 0 | 0 |
Assets, Settlements | 0 | 0 | 0 | (11) |
Assets, Net transfer In (Out) of Level 3 | 0 | 0 | 0 | 0 |
Balance at End of Period | 25 | 5 | 25 | 5 |
Change in Unrealized Included in OCI | 1 | 0 | 1 | 0 |
Preferred securities |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 8 | 8 | 8 | 8 |
Assets, Total (Losses) Gains Included in Earnings | 0 | 0 | (1) | 0 |
Assets, Total (Losses) Gains Included in AOCI | 0 | 0 | 1 | 0 |
Assets, Purchases | 0 | 0 | 0 | 0 |
Assets, Sales | 0 | 0 | 0 | 0 |
Assets, Settlements | 0 | 0 | 0 | 0 |
Assets, Net transfer In (Out) of Level 3 | 0 | 0 | 0 | 0 |
Balance at End of Period | 8 | 8 | 8 | 8 |
Change in Unrealized Included in OCI | 0 | 0 | 0 | 0 |
Equity securities |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 15 | 13 | 10 | 15 |
Assets, Total (Losses) Gains Included in Earnings | 2 |  | 2 | (2) |
Assets, Total (Losses) Gains Included in AOCI | 0 | 0 | 0 | 0 |
Assets, Purchases | 0 | 0 | 5 | 0 |
Assets, Sales | 0 | 0 | 0 | 0 |
Assets, Settlements | 0 | 0 | 0 | 0 |
Assets, Net transfer In (Out) of Level 3 | 0 | 0 | 0 | 0 |
Balance at End of Period | 17 | 13 | 17 | 13 |
Change in Unrealized Included in OCI | 0 | 0 | 0 | 0 |
Derivative investments |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period |  | 8 | 3 | 57 |
Assets, Total (Losses) Gains Included in Earnings |  |  | (2) | (50) |
Assets, Total (Losses) Gains Included in AOCI |  | (1) | (2) |  |
Assets, Purchases |  | 0 | 1 | 0 |
Assets, Sales |  | 0 | 0 | 0 |
Assets, Settlements |  | 0 | 0 | 0 |
Assets, Net transfer In (Out) of Level 3 |  | (7) | 0 | (7) |
Balance at End of Period | 0 | 0 | 0 | 0 |
Change in Unrealized Included in OCI |  |  | (2) | 1 |
Investment in unconsolidated affiliates |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 272 | 358 | 272 | 285 |
Assets, Total (Losses) Gains Included in Earnings | (2) | 6 | (2) | 79 |
Assets, Total (Losses) Gains Included in AOCI | 0 | 0 | 0 | 0 |
Assets, Purchases | 0 | 0 | 0 | 0 |
Assets, Sales | 0 | 0 | 0 | 0 |
Assets, Settlements | 0 | 0 | 0 | 0 |
Assets, Net transfer In (Out) of Level 3 | 0 | (92) | 0 | (92) |
Balance at End of Period | 270 | 272 | 270 | 272 |
Change in Unrealized Included in OCI | 0 | 0 | 0 | 0 |
Short term investments |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 5 | 71 | 37 | 0 |
Assets, Total (Losses) Gains Included in Earnings | 0 | 0 | 0 | 0 |
Assets, Total (Losses) Gains Included in AOCI | 0 | 0 | 0 | 0 |
Assets, Purchases | 2 | 85 | 8 | 156 |
Assets, Sales | 0 | 0 | 0 | 0 |
Assets, Settlements | 0 | 0 | (38) | 0 |
Assets, Net transfer In (Out) of Level 3 | 0 | 0 | 0 | 0 |
Balance at End of Period | 7 | 156 | 7 | 156 |
Change in Unrealized Included in OCI | 0 | 0 | 0 | 0 |
Available-for-sale embedded derivative |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 36 | 31 | 32 | 27 |
Assets, Total (Losses) Gains Included in Earnings | 0 | 0 | 0 | 0 |
Assets, Total (Losses) Gains Included in AOCI | 3 | 3 | 7 | 7 |
Assets, Purchases | 0 | 0 | 0 | 0 |
Assets, Sales | 0 | 0 | 0 | 0 |
Assets, Settlements | 0 | 0 | 0 | 0 |
Assets, Net transfer In (Out) of Level 3 | 0 | 0 | 0 | 0 |
Balance at End of Period | 39 | 34 | 39 | 34 |
Change in Unrealized Included in OCI | 3 | 3 | 7 | 7 |
Credit linked note |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 0 | 6 |  | 10 |
Assets, Total (Losses) Gains Included in Earnings | 0 | 0 |  | 1 |
Assets, Total (Losses) Gains Included in AOCI | 0 | 0 |  | 0 |
Assets, Purchases | 0 | 0 |  | 0 |
Assets, Sales | 0 | 0 |  | 0 |
Assets, Settlements | 0 | (2) |  | (7) |
Assets, Net transfer In (Out) of Level 3 | 0 | 0 |  | 0 |
Balance at End of Period | 0 | 4 | 0 | 4 |
Change in Unrealized Included in OCI | 0 | 0 |  | 0 |
MSRs |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 140 | 50 | 65 | 0 |
Assets, Total (Losses) Gains Included in Earnings | (4) | (3) | (3) | (3) |
Assets, Total (Losses) Gains Included in AOCI | 0 | 0 | 0 | 0 |
Assets, Purchases | 6 | 8 | 80 | 58 |
Assets, Sales | (17) | 0 | (17) | 0 |
Assets, Settlements | 0 | 0 | 0 | 0 |
Assets, Net transfer In (Out) of Level 3 | 0 | 0 | 0 | 0 |
Balance at End of Period | 125 | 55 | 125 | 55 |
Change in Unrealized Included in OCI | 0 | 0 | 0 | 0 |
Loan receivable |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 18 |  | 11 |  |
Assets, Total (Losses) Gains Included in Earnings | 0 |  | 0 |  |
Assets, Total (Losses) Gains Included in AOCI | 0 |  | 0 |  |
Assets, Purchases | 0 |  | 7 |  |
Assets, Sales | 0 |  | 0 |  |
Assets, Settlements | 0 |  | 0 |  |
Assets, Net transfer In (Out) of Level 3 | 0 |  | 0 |  |
Balance at End of Period | 18 |  | 18 |  |
Change in Unrealized Included in OCI | 0 |  | 0 |  |
Subtotal Level 3 assets at fair value | Level 3 |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 13,059 | 10,965 | 11,545 | 9,589 |
Assets, Total (Losses) Gains Included in Earnings | (4) | (2) | (25) | 35 |
Assets, Total (Losses) Gains Included in AOCI | 106 | 146 | 179 | 274 |
Assets, Purchases | 1,365 | 962 | 3,934 | 3,127 |
Assets, Sales | (350) | (30) | (876) | (255) |
Assets, Settlements | (595) | (403) | (1,238) | (1,007) |
Assets, Net transfer In (Out) of Level 3 | (221) | (176) | (159) | (301) |
Balance at End of Period | 13,360 | 11,462 | 13,360 | 11,462 |
Change in Unrealized Included in OCI | 99 | 144 | 170 | 270 |
Market risk benefits asset | Level 3 |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 213 | 103 | 189 | 88 |
Balance at End of Period | 242 | 134 | 242 | 134 |
Subtotal Level 3 liabilities at fair value |  |  |  |  |
Liabilities |  |  |  |  |
Change in Unrealized Gains (Losses) Included in OCI | 0 | 0 | 0 | 0 |
Subtotal Level 3 liabilities at fair value | Level 3 |  |  |  |  |
Liabilities |  |  |  |  |
Balance at Beginning of Period | 5,799 | 4,939 | 5,294 | 4,258 |
Balance at End of Period | 6,161 | 5,480 | 6,161 | 5,480 |
Market risk benefits liability | Level 3 |  |  |  |  |
Liabilities |  |  |  |  |
Balance at Beginning of Period | 711 | 459 | 549 | 403 |
Balance at End of Period | $ 830 | $ 603 | $ 830 | $ 603 |

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