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	Jun. 30, 2026	Dec. 31, 2025
Assets
Fixed maturity securities, at fair value under fair value option	$ 54,273	$ 54,561
Fixed maturity securities, at fair value under fair value option	94	0
Derivative investments	1,315	1,156
Market risk benefits asset	364	285
Total financial assets at fair value	2,512	1,933
Derivatives:
Market risk benefits liability	1,102	903
Level 1
Assets
Cash and cash equivalents	3,582	2,636
Fixed maturity securities, at fair value under fair value option	0
Derivative investments	0	0
Investments in unconsolidated affiliates	0	0
Short term investments	873	1,764
Indexed annuities/IUL ceded embedded derivatives, included in Reinsurance recoverable	0	0
Loan receivable, included in Prepaid expenses and other assets		0
Market risk benefits asset	0	0
Total financial assets at fair value	6,237	6,136
Derivatives:
Contingent consideration, included in Accounts payable and accrued liabilities	0	0
Market risk benefits liability	0	0
Total financial liabilities at fair value	0	1
Level 2
Assets
Cash and cash equivalents	0	0
Fixed maturity securities, at fair value under fair value option	94
Derivative investments	1,307	1,156
Investments in unconsolidated affiliates	0	0
Short term investments	32	82
Indexed annuities/IUL ceded embedded derivatives, included in Reinsurance recoverable	0	0
Loan receivable, included in Prepaid expenses and other assets		0
Market risk benefits asset	0	0
Total financial assets at fair value	40,980	41,896
Derivatives:
Contingent consideration, included in Accounts payable and accrued liabilities	0	0
Market risk benefits liability	0	0
Total financial liabilities at fair value		78
Total financial liabilities at fair value	11
Level 3
Assets
Cash and cash equivalents	0	0
Fixed maturity securities, at fair value under fair value option	0
Derivative investments	8	0
Investments in unconsolidated affiliates	267	270
Short term investments	76	74
Indexed annuities/IUL ceded embedded derivatives, included in Reinsurance recoverable	831	399
Loan receivable, included in Prepaid expenses and other assets		24
Market risk benefits asset	364	285
Total financial assets at fair value	16,018	14,530
Derivatives:
Contingent consideration, included in Accounts payable and accrued liabilities	62	72
Market risk benefits liability	1,102	903
Total financial liabilities at fair value	8,248	7,526
NAV
Assets
Total financial assets at fair value	48	35
Fair Value
Assets
Cash and cash equivalents	3,582	2,636
Fixed maturity securities, at fair value under fair value option	94
Derivative investments	1,315	1,156
Investments in unconsolidated affiliates	267	270
Short term investments	981	1,920
Indexed annuities/IUL ceded embedded derivatives, included in Reinsurance recoverable	831	399
Loan receivable, included in Prepaid expenses and other assets		24
Market risk benefits asset	364	285
Total financial assets at fair value	63,283	62,597
Derivatives:
Contingent consideration, included in Accounts payable and accrued liabilities	62	72
Market risk benefits liability	1,102	903
Total financial liabilities at fair value	8,259	7,605
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	7,080	6,542
Indexed annuities/IUL embedded derivatives, included in Contractholder funds \| Fair Value
Derivatives:
Derivative liability	7,080	6,542
Interest rate and foreign currency swaps, included in Accounts payable and accrued liabilities \| Level 1
Derivatives:
Derivative liability	0	0
Interest rate and foreign currency swaps, included in Accounts payable and accrued liabilities \| Level 2
Derivatives:
Derivative liability	37	3
Interest rate and foreign currency swaps, included in Accounts payable and accrued liabilities \| Level 3
Derivatives:
Derivative liability	4	9
Interest rate and foreign currency swaps, included in Accounts payable and accrued liabilities \| Fair Value
Derivatives:
Derivative liability	41	12
Equity options \| Level 1
Derivatives:
Derivative liability		1
Equity options \| Level 2
Derivatives:
Derivative liability		0
Equity options \| Level 3
Derivatives:
Derivative liability		0
Equity options \| Fair Value
Derivatives:
Derivative liability		1
Reinsurance related embedded derivatives, included in Funds withheld for reinsurance liabilities \| Level 1
Derivatives:
Derivative liability	0	0
Reinsurance related embedded derivatives, included in Funds withheld for reinsurance liabilities \| Level 2
Derivatives:
Derivative liability	(26)	75
Reinsurance related embedded derivatives, included in Funds withheld for reinsurance liabilities \| Level 3
Derivatives:
Derivative liability	0	0
Reinsurance related embedded derivatives, included in Funds withheld for reinsurance liabilities \| Fair Value
Derivatives:
Derivative liability	(26)	75
Asset-backed securities ("ABS")
Assets
Fixed maturity securities, at fair value under fair value option	17,876	18,738
Asset-backed securities ("ABS") \| Level 1
Assets
Fixed maturity securities, at fair value under fair value option	0	0
Asset-backed securities ("ABS") \| Level 2
Assets
Fixed maturity securities, at fair value under fair value option	7,381	8,644
Asset-backed securities ("ABS") \| Level 3
Assets
Fixed maturity securities, at fair value under fair value option	10,495	10,094
Asset-backed securities ("ABS") \| Fair Value
Assets
Fixed maturity securities, at fair value under fair value option	17,876	18,738
Commercial mortgage-backed securities
Assets
Fixed maturity securities, at fair value under fair value option	4,665	5,199
Commercial mortgage-backed securities \| Level 1
Assets
Fixed maturity securities, at fair value under fair value option	0	0
Commercial mortgage-backed securities \| Level 2
Assets
Fixed maturity securities, at fair value under fair value option	4,665	5,200
Commercial mortgage-backed securities \| Level 3
Assets
Fixed maturity securities, at fair value under fair value option	0	0
Commercial mortgage-backed securities \| Fair Value
Assets
Fixed maturity securities, at fair value under fair value option	4,665	5,200
Corporates
Assets
Fixed maturity securities, at fair value under fair value option	24,850	24,447
Corporates \| Level 1
Assets
Fixed maturity securities, at fair value under fair value option	39	40
Corporates \| Level 2
Assets
Fixed maturity securities, at fair value under fair value option	21,064	21,263
Corporates \| Level 3
Assets
Fixed maturity securities, at fair value under fair value option	3,747	3,145
Corporates \| Fair Value
Assets
Fixed maturity securities, at fair value under fair value option	24,850	24,448
Hybrids
Assets
Fixed maturity securities, at fair value under fair value option	597	609
Hybrids \| Level 1
Assets
Fixed maturity securities, at fair value under fair value option	34	36
Hybrids \| Level 2
Assets
Fixed maturity securities, at fair value under fair value option	549	558
Hybrids \| Level 3
Assets
Fixed maturity securities, at fair value under fair value option	14	15
Hybrids \| Fair Value
Assets
Fixed maturity securities, at fair value under fair value option	597	609
Municipals
Assets
Fixed maturity securities, at fair value under fair value option	1,363	1,393
Municipals \| Level 1
Assets
Fixed maturity securities, at fair value under fair value option	0	0
Municipals \| Level 2
Assets
Fixed maturity securities, at fair value under fair value option	1,360	1,390
Municipals \| Level 3
Assets
Fixed maturity securities, at fair value under fair value option	3	3
Municipals \| Fair Value
Assets
Fixed maturity securities, at fair value under fair value option	1,363	1,393
Residential mortgage-backed securities
Assets
Fixed maturity securities, at fair value under fair value option	3,748	2,851
Residential mortgage-backed securities \| Level 1
Assets
Fixed maturity securities, at fair value under fair value option	0	0
Residential mortgage-backed securities \| Level 2
Assets
Fixed maturity securities, at fair value under fair value option	3,748	2,848
Residential mortgage-backed securities \| Level 3
Assets
Fixed maturity securities, at fair value under fair value option	0	3
Residential mortgage-backed securities \| Fair Value
Assets
Fixed maturity securities, at fair value under fair value option	3,748	2,851
U.S. Government
Assets
Fixed maturity securities, at fair value under fair value option	766	956
U.S. Government \| Level 1
Assets
Fixed maturity securities, at fair value under fair value option	751	938
U.S. Government \| Level 2
Assets
Fixed maturity securities, at fair value under fair value option	15	15
U.S. Government \| Level 3
Assets
Fixed maturity securities, at fair value under fair value option	0	0
U.S. Government \| Fair Value
Assets
Fixed maturity securities, at fair value under fair value option	766	953
Foreign Governments
Assets
Fixed maturity securities, at fair value under fair value option	408	368
Foreign Governments \| Level 1
Assets
Fixed maturity securities, at fair value under fair value option	105	107
Foreign Governments \| Level 2
Assets
Fixed maturity securities, at fair value under fair value option	280	238
Foreign Governments \| Level 3
Assets
Fixed maturity securities, at fair value under fair value option	23	23
Foreign Governments \| Fair Value
Assets
Fixed maturity securities, at fair value under fair value option	408	368
Preferred equity securities
Assets
Preferred and common equity securities	391	436
Preferred equity securities \| Level 1
Assets
Preferred and common equity securities	169	174
Preferred equity securities \| Level 2
Assets
Preferred and common equity securities	221	254
Preferred equity securities \| Level 3
Assets
Preferred and common equity securities	1	8
Preferred equity securities \| Fair Value
Assets
Preferred and common equity securities	391	436
Common equity securities \| Level 1
Assets
Preferred and common equity securities	684	441
Common equity securities \| Level 2
Assets
Preferred and common equity securities	0	0
Common equity securities \| Level 3
Assets
Preferred and common equity securities	13	17
Common equity securities \| NAV
Assets
Preferred and common equity securities	48	35
Common equity securities \| Fair Value
Assets
Preferred and common equity securities	745	493
Other long-term investments \| Level 1
Assets
Other long-term investments/Mortgage servicing rights ("MSRs")	0	0
Other long-term investments \| Level 2
Assets
Other long-term investments/Mortgage servicing rights ("MSRs")	264	248
Other long-term investments \| Level 3
Assets
Other long-term investments/Mortgage servicing rights ("MSRs")	0	41
Other long-term investments \| Fair Value
Assets
Other long-term investments/Mortgage servicing rights ("MSRs")	264	289
Mortgage servicing rights ("MSRs") \| Level 1
Assets
Other long-term investments/Mortgage servicing rights ("MSRs")	0	0
Mortgage servicing rights ("MSRs") \| Level 2
Assets
Other long-term investments/Mortgage servicing rights ("MSRs")	0	0
Mortgage servicing rights ("MSRs") \| Level 3
Assets
Other long-term investments/Mortgage servicing rights ("MSRs")	176	129
Mortgage servicing rights ("MSRs") \| Fair Value
Assets
Other long-term investments/Mortgage servicing rights ("MSRs")	176	129
Equity securities
Assets
Preferred and common equity securities	$ 745	$ 493

Financial Liabilities, Net Fair Value Disclosure

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Fair value portion of asset recognized for present right to economic benefit.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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