Fair Value of Financial Instruments - Carrying Amounts of Assets and Liabilities at Estimated Fair Value Measured on a Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Assets
Fixed maturity securities available for sale	$ 45,746	$ 42,373
Derivative asset and reinsurance related embedded derivative, included in other assets	1,032	797
Market risk benefits asset	103	88
Total financial assets at fair value	1,386	1,312
Derivatives:
Market risk benefits liability	459	403
Level 1
Assets
Cash and cash equivalents	4,890	2,767
Short term investments	812	2,111
Derivative asset and reinsurance related embedded derivative, included in other assets	0	0
Investment in unconsolidated affiliates	0	0
Market risk benefits asset	0	0
Other assets	0
Total financial assets at fair value	7,296	6,566
Derivatives:
Contingent consideration obligation	0
Market risk benefits liability	0	0
Total financial liabilities at fair value	4	1
Level 2
Assets
Cash and cash equivalents	0	0
Short term investments	4	8
Derivative asset and reinsurance related embedded derivative, included in other assets	1,024	740
Investment in unconsolidated affiliates	0	0
Market risk benefits asset	0	0
Other assets	0
Total financial assets at fair value	36,048	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	71	0
Derivative asset and reinsurance related embedded derivative, included in other assets	8	57
Investment in unconsolidated affiliates	358	285
Market risk benefits asset	103	88
Other assets	50
Total financial assets at fair value	11,068	9,677
Derivatives:
Contingent consideration obligation	63
Market risk benefits liability	459	403
Total financial liabilities at fair value	5,398	4,661
NAV
Assets
Total financial assets at fair value	61	59
Fair Value
Assets
Cash and cash equivalents	4,890	2,767
Short term investments	887	2,119
Derivative asset and reinsurance related embedded derivative, included in other assets	1,032	797
Investment in unconsolidated affiliates	358	285
Market risk benefits asset	103	88
Other assets	50
Total financial assets at fair value	54,473	50,005
Derivatives:
Contingent consideration obligation	63
Market risk benefits liability	459	403
Total financial liabilities at fair value	5,402	4,662
Reinsurance related embedded derivative, included in other assets \| Level 1
Assets
Derivative asset and reinsurance related embedded derivative, included in other assets	0	0
Reinsurance related embedded derivative, included in other assets \| Level 2
Assets
Derivative asset and reinsurance related embedded derivative, included in other assets	144	152
Reinsurance related embedded derivative, included in other assets \| Level 3
Assets
Derivative asset and reinsurance related embedded derivative, included in other assets	0	0
Reinsurance related embedded derivative, included in other assets \| Fair Value
Assets
Derivative asset and reinsurance related embedded derivative, included in other assets	144	152
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	4,848	4,258
Indexed annuities/indexed universal life insurance ("IUL") embedded derivatives, included in contractholder funds \| Fair Value
Derivatives:
Derivative liability	4,848	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	28
Interest rate swaps \| Fair Value
Derivatives:
Derivative liability	28
Equity options \| Level 1
Derivatives:
Derivative liability	4	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	4	1
Asset-backed securities ("ABS")
Assets
Fixed maturity securities available for sale	15,559	14,342
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	7,517	7,220
Asset-backed securities ("ABS") \| Level 3
Assets
Fixed maturity securities available for sale	8,042	7,122
Asset-backed securities ("ABS") \| Fair Value
Assets
Fixed maturity securities available for sale	15,559	14,342
Commercial mortgage-backed securities
Assets
Fixed maturity securities available for sale	4,989	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	4,974	4,457
Commercial mortgage-backed securities \| Level 3
Assets
Fixed maturity securities available for sale	15	18
Commercial mortgage-backed securities \| Fair Value
Assets
Fixed maturity securities available for sale	4,989	4,475
Corporates
Assets
Fixed maturity securities available for sale	19,684	17,896
Corporates \| Level 1
Assets
Fixed maturity securities available for sale	33	25
Corporates \| Level 2
Assets
Fixed maturity securities available for sale	17,296	15,892
Corporates \| Level 3
Assets
Fixed maturity securities available for sale	2,355	1,979
Corporates \| Fair Value
Assets
Fixed maturity securities available for sale	19,684	17,896
Hybrids
Assets
Fixed maturity securities available for sale	639	618
Hybrids \| Level 1
Assets
Fixed maturity securities available for sale	96	95
Hybrids \| Level 2
Assets
Fixed maturity securities available for sale	543	523
Hybrids \| Level 3
Assets
Fixed maturity securities available for sale	0	0
Hybrids \| Fair Value
Assets
Fixed maturity securities available for sale	639	618
Municipals \| Level 1
Assets
Fixed maturity securities available for sale	0	0
Municipals \| Level 2
Assets
Fixed maturity securities available for sale	1,464	1,562
Municipals \| Level 3
Assets
Fixed maturity securities available for sale	0	49
Municipals \| Fair Value
Assets
Fixed maturity securities available for sale	1,464	1,611
Residential mortgage-backed securities
Assets
Fixed maturity securities available for sale	2,454	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	2,451	2,426
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	2,454	2,429
U.S. Government
Assets
Fixed maturity securities available for sale	635	678
U.S. Government \| Level 1
Assets
Fixed maturity securities available for sale	629	662
U.S. Government \| Level 2
Assets
Fixed maturity securities available for sale	6	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	635	678
Foreign Governments
Assets
Fixed maturity securities available for sale	322	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	317	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	322	324
Preferred securities
Assets
Equity and preferred securities	505	621
Preferred securities \| Level 1
Assets
Equity and preferred securities	189	214
Preferred securities \| Level 2
Assets
Equity and preferred securities	308	399
Preferred securities \| Level 3
Assets
Equity and preferred securities	8	8
Preferred securities \| Fair Value
Assets
Equity and preferred securities	505	621
Equity securities \| Level 1
Assets
Equity and preferred securities	647	692
Equity securities \| Level 2
Assets
Equity and preferred securities	0	0
Equity securities \| Level 3
Assets
Equity and preferred securities	13	15
Equity securities \| NAV
Assets
Equity and preferred securities	61	59
Equity securities \| Fair Value
Assets
Equity and preferred securities	721	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	37	37
Other long-term investments \| Fair Value
Assets
Other long-term investments	$ 37	$ 37

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