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Fair Value of Financial Instruments - Carrying Amounts of Assets and Liabilities at Estimated Fair Value Measured on a Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Fixed maturity securities available for sale | $ 44,566 | $ 42,373
Derivative asset | 1,024 | 797
Market risk benefits asset | 95 | 88
Total financial assets at fair value | 1,338 | 1,312
Derivatives: |  |
Market risk benefits liability | 425 | 403
Level 1 |  |
Assets |  |
Cash and cash equivalents | 3,517 | 2,767
Short term investments | 637 | 2,111
Derivative asset | 0 | 0
Investment in unconsolidated affiliates | 0 | 0
Market risk benefits asset | 0 | 0
Total financial assets at fair value | 5,872 | 6,566
Derivatives: |  |
Contingent consideration obligation | 0 |
Market risk benefits liability | 0 | 0
Total financial liabilities at fair value | 3 | 1
Level 2 |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Short term investments | 0 | 8
Derivative asset | 1,015 | 740
Investment in unconsolidated affiliates | 0 | 0
Market risk benefits asset | 0 | 0
Total financial assets at fair value | 35,292 | 33,703
Derivatives: |  |
Contingent consideration obligation | 0 |
Market risk benefits liability | 0 | 0
Total financial liabilities at fair value | 0 | 0
Level 3 |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Short term investments | 9 | 0
Derivative asset | 9 | 57
Investment in unconsolidated affiliates | 343 | 285
Market risk benefits asset | 95 | 88
Total financial assets at fair value | 10,476 | 9,677
Derivatives: |  |
Contingent consideration obligation | 57 |
Market risk benefits liability | 425 | 403
Total financial liabilities at fair value | 5,180 | 4,661
NAV |  |
Assets |  |
Total financial assets at fair value | 59 | 59
Fair Value |  |
Assets |  |
Cash and cash equivalents | 3,517 | 2,767
Short term investments | 646 | 2,119
Derivative asset | 1,024 | 797
Investment in unconsolidated affiliates | 343 | 285
Market risk benefits asset | 95 | 88
Total financial assets at fair value | 51,699 | 50,005
Derivatives: |  |
Contingent consideration obligation | 57 |
Market risk benefits liability | 425 | 403
Total financial liabilities at fair value | 5,183 | 4,662
Reinsurance related embedded derivative, included in other assets | Level 1 |  |
Assets |  |
Derivative asset | 0 | 0
Reinsurance related embedded derivative, included in other assets | Level 2 |  |
Assets |  |
Derivative asset | 134 | 152
Reinsurance related embedded derivative, included in other assets | Level 3 |  |
Assets |  |
Derivative asset | 0 | 0
Reinsurance related embedded derivative, included in other assets | Fair Value |  |
Assets |  |
Derivative asset | 134 | 152
Indexed annuities/IUL embedded derivatives, included in contractholder funds | Level 1 |  |
Derivatives: |  |
Derivative liability | 0 | 0
Indexed annuities/IUL embedded derivatives, included in contractholder funds | Level 2 |  |
Derivatives: |  |
Derivative liability | 0 | 0
Indexed annuities/IUL embedded derivatives, included in contractholder funds | Level 3 |  |
Derivatives: |  |
Derivative liability | 4,679 | 4,258
Indexed annuities/IUL embedded derivatives, included in contractholder funds | Fair Value |  |
Derivatives: |  |
Derivative liability | 4,679 | 4,258
Interest Rate Swaps | Level 1 |  |
Derivatives: |  |
Derivative liability | 0 |
Interest Rate Swaps | Level 2 |  |
Derivatives: |  |
Derivative liability | 0 |
Interest Rate Swaps | Level 3 |  |
Derivatives: |  |
Derivative liability | 19 |
Interest Rate Swaps | Fair Value |  |
Derivatives: |  |
Derivative liability | 19 |
Call options | Level 1 |  |
Derivatives: |  |
Derivative liability | 3 |
Call options | Level 2 |  |
Derivatives: |  |
Derivative liability | 0 |
Call options | Level 3 |  |
Derivatives: |  |
Derivative liability | 0 |
Call options | Fair Value |  |
Derivatives: |  |
Derivative liability | 3 |
Futures contracts | Level 1 |  |
Derivatives: |  |
Derivative liability |  | 1
Futures contracts | Level 2 |  |
Derivatives: |  |
Derivative liability |  | 0
Futures contracts | Level 3 |  |
Derivatives: |  |
Derivative liability |  | 0
Futures contracts | Fair Value |  |
Derivatives: |  |
Derivative liability |  | 1
Asset-backed securities |  |
Assets |  |
Fixed maturity securities available for sale | 15,115 | 14,342
Asset-backed securities | Level 1 |  |
Assets |  |
Fixed maturity securities available for sale | 0 | 0
Asset-backed securities | Level 2 |  |
Assets |  |
Fixed maturity securities available for sale | 7,379 | 7,220
Asset-backed securities | Level 3 |  |
Assets |  |
Fixed maturity securities available for sale | 7,736 | 7,122
Asset-backed securities | Fair Value |  |
Assets |  |
Fixed maturity securities available for sale | 15,115 | 14,342
Commercial mortgage-backed securities |  |
Assets |  |
Fixed maturity securities available for sale | 4,818 | 4,475
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 | 4,806 | 4,457
Commercial mortgage-backed securities | Level 3 |  |
Assets |  |
Fixed maturity securities available for sale | 12 | 18
Commercial mortgage-backed securities | Fair Value |  |
Assets |  |
Fixed maturity securities available for sale | 4,818 | 4,475
Corporates |  |
Assets |  |
Fixed maturity securities available for sale | 18,971 | 17,896
Corporates | Level 1 |  |
Assets |  |
Fixed maturity securities available for sale | 25 | 25
Corporates | Level 2 |  |
Assets |  |
Fixed maturity securities available for sale | 16,762 | 15,892
Corporates | Level 3 |  |
Assets |  |
Fixed maturity securities available for sale | 2,184 | 1,979
Corporates | Fair Value |  |
Assets |  |
Fixed maturity securities available for sale | 18,971 | 17,896
Hybrids |  |
Assets |  |
Fixed maturity securities available for sale | 633 | 618
Hybrids | Level 1 |  |
Assets |  |
Fixed maturity securities available for sale | 99 | 95
Hybrids | Level 2 |  |
Assets |  |
Fixed maturity securities available for sale | 534 | 523
Hybrids | Level 3 |  |
Assets |  |
Fixed maturity securities available for sale | 0 | 0
Hybrids | Fair Value |  |
Assets |  |
Fixed maturity securities available for sale | 633 | 618
Municipals | Level 1 |  |
Assets |  |
Fixed maturity securities available for sale | 0 | 0
Municipals | Level 2 |  |
Assets |  |
Fixed maturity securities available for sale | 1,529 | 1,562
Municipals | Level 3 |  |
Assets |  |
Fixed maturity securities available for sale | 18 | 49
Municipals | Fair Value |  |
Assets |  |
Fixed maturity securities available for sale | 1,547 | 1,611
Residential mortgage-backed securities |  |
Assets |  |
Fixed maturity securities available for sale | 2,464 | 2,429
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 | 2,460 | 2,426
Residential mortgage-backed securities | Level 3 |  |
Assets |  |
Fixed maturity securities available for sale | 4 | 3
Residential mortgage-backed securities | Fair Value |  |
Assets |  |
Fixed maturity securities available for sale | 2,464 | 2,429
U.S. Government |  |
Assets |  |
Fixed maturity securities available for sale | 698 | 678
U.S. Government | Level 1 |  |
Assets |  |
Fixed maturity securities available for sale | 682 | 662
U.S. Government | Level 2 |  |
Assets |  |
Fixed maturity securities available for sale | 16 | 16
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 | 698 | 678
Foreign Governments |  |
Assets |  |
Fixed maturity securities available for sale | 320 | 324
Foreign Governments | Level 1 |  |
Assets |  |
Fixed maturity securities available for sale | 0 | 0
Foreign Governments | Level 2 |  |
Assets |  |
Fixed maturity securities available for sale | 315 | 308
Foreign Governments | Level 3 |  |
Assets |  |
Fixed maturity securities available for sale | 5 | 16
Foreign Governments | Fair Value |  |
Assets |  |
Fixed maturity securities available for sale | 320 | 324
Preferred securities |  |
Assets |  |
Equity and preferred securities | 542 | 621
Preferred securities | Level 1 |  |
Assets |  |
Equity and preferred securities | 192 | 214
Preferred securities | Level 2 |  |
Assets |  |
Equity and preferred securities | 342 | 399
Preferred securities | Level 3 |  |
Assets |  |
Equity and preferred securities | 8 | 8
Preferred securities | Fair Value |  |
Assets |  |
Equity and preferred securities | 542 | 621
Equity securities | Level 1 |  |
Assets |  |
Equity and preferred securities | 720 | 692
Equity securities | Level 2 |  |
Assets |  |
Equity and preferred securities | 0 | 0
Equity securities | Level 3 |  |
Assets |  |
Equity and preferred securities | 14 | 15
Equity securities | NAV |  |
Assets |  |
Equity and preferred securities | 59 | 59
Equity securities | Fair Value |  |
Assets |  |
Equity and preferred securities | 793 | 766
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 | 39 | 37
Other long-term investments | Fair Value |  |
Assets |  |
Other long-term investments | $ 39 | $ 37

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