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Fair Value of Financial Instruments - Schedule of Carrying Amounts of Assets and Liabilities at Estimated Fair Value Measured on a Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Assets |  |
Fixed maturity securities available for sale | $ 49,824 | $ 48,218
Derivative investments and reinsurance related embedded derivative, included in other assets | 705 | 794
Market risk benefits asset | 187 | 189
Total financial assets at fair value | 1,396 | 1,433
Derivatives: |  |
Market risk benefits liability | 635 | 549
Level 1 |  |
Assets |  |
Cash and cash equivalents | 4,484 | 3,479
Derivative investments and reinsurance related embedded derivative, included in other assets | 1 | 0
Investment in unconsolidated affiliates | 0 | 0
Short term investments | 1,106 | 2,995
Loan receivable, included in Prepaid expenses and other assets | 0 | 0
Market risk benefits asset | 0 | 0
Total financial assets at fair value | 7,026 | 7,945
Derivatives: |  |
Contingent consideration obligation, included in Accounts payable and accrued liabilities | 0 | 0
Market risk benefits liability | 0 | 0
Total financial liabilities at fair value | 1 | 1
Level 2 |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Derivative investments and reinsurance related embedded derivative, included in other assets | 703 | 791
Investment in unconsolidated affiliates | 0 | 0
Short term investments | 15 | 18
Loan receivable, included in Prepaid expenses and other assets | 0 | 0
Market risk benefits asset | 0 | 0
Total financial assets at fair value | 38,153 | 37,459
Derivatives: |  |
Contingent consideration obligation, included in Accounts payable and accrued liabilities | 0 | 0
Market risk benefits liability | 0 | 0
Total financial liabilities at fair value | (78) | (99)
Level 3 |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Derivative investments and reinsurance related embedded derivative, included in other assets | 1 | 3
Investment in unconsolidated affiliates | 272 | 272
Short term investments | 40 | 37
Loan receivable, included in Prepaid expenses and other assets | 11 | 11
Market risk benefits asset | 187 | 189
Total financial assets at fair value | 12,518 | 11,734
Derivatives: |  |
Contingent consideration obligation, included in Accounts payable and accrued liabilities | 64 | 74
Market risk benefits liability | 635 | 549
Total financial liabilities at fair value | 6,016 | 5,843
NAV |  |
Assets |  |
Total financial assets at fair value | 22 | 57
Fair Value |  |
Assets |  |
Cash and cash equivalents | 4,484 | 3,479
Derivative investments and reinsurance related embedded derivative, included in other assets | 705 | 794
Investment in unconsolidated affiliates | 272 | 272
Short term investments | 1,161 | 3,050
Loan receivable, included in Prepaid expenses and other assets | 11 | 11
Market risk benefits asset | 187 | 189
Total financial assets at fair value | 57,719 | 57,195
Derivatives: |  |
Contingent consideration obligation, included in Accounts payable and accrued liabilities | 64 | 74
Market risk benefits liability | 635 | 549
Total financial liabilities at fair value | 5,939 | 5,745
Indexed annuities/indexed universal life insurance ("IUL") embedded derivatives, included in Contractholder funds | Level 1 |  |
Derivatives: |  |
Derivative liability | 0 | 0
Indexed annuities/indexed universal life insurance ("IUL") embedded derivatives, included in Contractholder funds | Level 2 |  |
Derivatives: |  |
Derivative liability | 0 | 0
Indexed annuities/indexed universal life insurance ("IUL") embedded derivatives, included in Contractholder funds | Level 3 |  |
Derivatives: |  |
Derivative liability | 5,316 | 5,220
Indexed annuities/indexed universal life insurance ("IUL") embedded derivatives, included in Contractholder funds | Fair Value |  |
Derivatives: |  |
Derivative liability | 5,316 | 5,220
Interest rate swaps | Level 1 |  |
Derivatives: |  |
Derivative liability | 0 | 0
Interest rate swaps | Level 2 |  |
Derivatives: |  |
Derivative liability | 0 | 10
Interest rate swaps | Level 3 |  |
Derivatives: |  |
Derivative liability | 1 | 0
Interest rate swaps | Fair Value |  |
Derivatives: |  |
Derivative liability | 1 | 10
Equity options | Level 1 |  |
Derivatives: |  |
Derivative liability | 1 | 1
Equity options | Level 2 |  |
Derivatives: |  |
Derivative liability | 0 | 0
Equity options | Level 3 |  |
Derivatives: |  |
Derivative liability | 0 | 0
Equity options | Fair Value |  |
Derivatives: |  |
Derivative liability | 1 | 1
Reinsurance related embedded derivatives | Level 1 |  |
Derivatives: |  |
Reinsurance related embedded derivatives, included in Funds withheld for reinsurance liabilities | 0 | 0
Reinsurance related embedded derivatives | Level 2 |  |
Derivatives: |  |
Reinsurance related embedded derivatives, included in Funds withheld for reinsurance liabilities | (78) | (109)
Reinsurance related embedded derivatives | Level 3 |  |
Derivatives: |  |
Reinsurance related embedded derivatives, included in Funds withheld for reinsurance liabilities | 0 | 0
Reinsurance related embedded derivatives | Fair Value |  |
Derivatives: |  |
Reinsurance related embedded derivatives, included in Funds withheld for reinsurance liabilities | (78) | (109)
Asset-backed securities ("ABS") |  |
Assets |  |
Fixed maturity securities available for sale | 16,268 | 15,656
Asset-backed securities ("ABS") | Level 1 |  |
Assets |  |
Fixed maturity securities available for sale | 0 | 0
Asset-backed securities ("ABS") | Level 2 |  |
Assets |  |
Fixed maturity securities available for sale | 7,420 | 7,513
Asset-backed securities ("ABS") | Level 3 |  |
Assets |  |
Fixed maturity securities available for sale | 8,848 | 8,143
Asset-backed securities ("ABS") | Fair Value |  |
Assets |  |
Fixed maturity securities available for sale | 16,268 | 15,656
Commercial mortgage-backed securities |  |
Assets |  |
Fixed maturity securities available for sale | 5,142 | 5,182
Commercial mortgage-backed securities | Level 1 |  |
Assets |  |
Fixed maturity securities available for sale | 0 | 0
Commercial mortgage-backed securities | Level 2 |  |
Assets |  |
Fixed maturity securities available for sale | 5,142 | 5,182
Commercial mortgage-backed securities | Level 3 |  |
Assets |  |
Fixed maturity securities available for sale | 0 | 0
Commercial mortgage-backed securities | Fair Value |  |
Assets |  |
Fixed maturity securities available for sale | 5,142 | 5,182
Corporates |  |
Assets |  |
Fixed maturity securities available for sale | 22,748 | 21,696
Corporates | Level 1 |  |
Assets |  |
Fixed maturity securities available for sale | 40 | 41
Corporates | Level 2 |  |
Assets |  |
Fixed maturity securities available for sale | 19,702 | 18,698
Corporates | Level 3 |  |
Assets |  |
Fixed maturity securities available for sale | 3,006 | 2,957
Corporates | Fair Value |  |
Assets |  |
Fixed maturity securities available for sale | 22,748 | 21,696
Hybrids |  |
Assets |  |
Fixed maturity securities available for sale | 512 | 581
Hybrids | Level 1 |  |
Assets |  |
Fixed maturity securities available for sale | 35 | 35
Hybrids | Level 2 |  |
Assets |  |
Fixed maturity securities available for sale | 471 | 546
Hybrids | Level 3 |  |
Assets |  |
Fixed maturity securities available for sale | 6 | 0
Hybrids | Fair Value |  |
Assets |  |
Fixed maturity securities available for sale | 512 | 581
Municipals |  |
Assets |  |
Fixed maturity securities available for sale | 1,410 | 1,386
Municipals | Level 1 |  |
Assets |  |
Fixed maturity securities available for sale | 0 | 0
Municipals | Level 2 |  |
Assets |  |
Fixed maturity securities available for sale | 1,406 | 1,386
Municipals | Level 3 |  |
Assets |  |
Fixed maturity securities available for sale | 4 | 0
Municipals | Fair Value |  |
Assets |  |
Fixed maturity securities available for sale | 1,410 | 1,386
Residential mortgage-backed securities |  |
Assets |  |
Fixed maturity securities available for sale | 2,748 | 2,796
Residential mortgage-backed securities | Level 1 |  |
Assets |  |
Fixed maturity securities available for sale | 0 | 0
Residential mortgage-backed securities | Level 2 |  |
Assets |  |
Fixed maturity securities available for sale | 2,745 | 2,793
Residential mortgage-backed securities | Level 3 |  |
Assets |  |
Fixed maturity securities available for sale | 3 | 3
Residential mortgage-backed securities | Fair Value |  |
Assets |  |
Fixed maturity securities available for sale | 2,748 | 2,796
U.S. Government |  |
Assets |  |
Fixed maturity securities available for sale | 672 | 637
U.S. Government | Level 1 |  |
Assets |  |
Fixed maturity securities available for sale | 666 | 631
U.S. Government | Level 2 |  |
Assets |  |
Fixed maturity securities available for sale | 6 | 6
U.S. Government | Level 3 |  |
Assets |  |
Fixed maturity securities available for sale | 0 | 0
U.S. Government | Fair Value |  |
Assets |  |
Fixed maturity securities available for sale | 672 | 637
Foreign Governments |  |
Assets |  |
Fixed maturity securities available for sale | 324 | 284
Foreign Governments | Level 1 |  |
Assets |  |
Fixed maturity securities available for sale | 0 | 0
Foreign Governments | Level 2 |  |
Assets |  |
Fixed maturity securities available for sale | 301 | 280
Foreign Governments | Level 3 |  |
Assets |  |
Fixed maturity securities available for sale | 23 | 4
Foreign Governments | Fair Value |  |
Assets |  |
Fixed maturity securities available for sale | 324 | 284
Preferred securities |  |
Assets |  |
Equity and preferred securities | 429 | 443
Preferred securities | Level 1 |  |
Assets |  |
Equity and preferred securities | 179 | 189
Preferred securities | Level 2 |  |
Assets |  |
Equity and preferred securities | 242 | 246
Preferred securities | Level 3 |  |
Assets |  |
Equity and preferred securities | 8 | 8
Preferred securities | Fair Value |  |
Assets |  |
Equity and preferred securities | 429 | 443
Equity securities | Level 1 |  |
Assets |  |
Equity and preferred securities | 515 | 575
Equity securities | Level 2 |  |
Assets |  |
Equity and preferred securities | 0 | 0
Equity securities | Level 3 |  |
Assets |  |
Equity and preferred securities | 10 | 10
Equity securities | NAV |  |
Assets |  |
Equity and preferred securities | 22 | 57
Equity securities | Fair Value |  |
Assets |  |
Equity and preferred securities | 547 | 642
Other long-term investments | Level 1 |  |
Assets |  |
Other long-term investments | 0 | 0
Other long-term investments | Level 2 |  |
Assets |  |
Other long-term investments | 0 | 0
Other long-term investments | Level 3 |  |
Assets |  |
Other long-term investments | 32 | 32
Other long-term investments | Fair Value |  |
Assets |  |
Other long-term investments | 32 | 32
Other assets | Level 1 |  |
Assets |  |
Other assets | 0 | 0
Other assets | Level 2 |  |
Assets |  |
Other assets | 0 | 0
Other assets | Level 3 |  |
Assets |  |
Other assets | 67 | 65
Other assets | Fair Value |  |
Assets |  |
Other assets | $ 67 | $ 65

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