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	Sep. 30, 2026	Dec. 31, 2025
Assets
Fixed maturity securities, available-for-sale:	$ 50,712	$ 52,700
Fixed maturity securities, at fair value under fair value option	78	0
Derivative investments	1,126	1,148
Investments in unconsolidated affiliates	256	270
Loan receivable, included in Prepaid expenses and other assets	0	24
Market risk benefits asset	343	285
Total financial assets at fair value	2,270	1,771
Derivatives:
Contingent consideration, included in Accounts payable and accrued liabilities	63	72
Market risk benefits liability	906	903
Fair Value
Assets
Cash and cash equivalents	1,560	1,486
Derivative investments	1,126	1,148
Investments in unconsolidated affiliates	4,894	4,608
Short term investments	724	1,043
Indexed annuities/IUL ceded embedded derivatives, included in Reinsurance recoverable	947	399
Loan receivable, included in Prepaid expenses and other assets		24
Market risk benefits asset	343	285
Total financial assets at fair value	56,313	57,985
Derivatives:
Contingent consideration, included in Accounts payable and accrued liabilities	63	72
Market risk benefits liability	906	903
Total financial liabilities at fair value	7,178	7,604
Level 1
Assets
Cash and cash equivalents	1,560	1,486
Derivative investments	0	0
Investments in unconsolidated affiliates	0	0
Short term investments	591	887
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	2,741	3,119
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	0
Level 2
Assets
Cash and cash equivalents	0	0
Derivative investments	1,117	1,148
Investments in unconsolidated affiliates	0	0
Short term investments	4	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	36,955	40,464
Derivatives:
Contingent consideration, included in Accounts payable and accrued liabilities	63	0
Market risk benefits liability	0	0
Total financial liabilities at fair value	(203)
Total financial liabilities at fair value		78
Level 3
Assets
Cash and cash equivalents	0	0
Derivative investments	9	0
Investments in unconsolidated affiliates	0	0
Short term investments	129	74
Indexed annuities/IUL ceded embedded derivatives, included in Reinsurance recoverable	947	399
Loan receivable, included in Prepaid expenses and other assets		24
Market risk benefits asset	343	285
Total financial assets at fair value	16,570	14,367
Derivatives:
Contingent consideration, included in Accounts payable and accrued liabilities	0	72
Market risk benefits liability	906	903
Total financial liabilities at fair value	7,381	7,526
NAV
Assets
Investments in unconsolidated affiliates	4,894	4,608
Total financial assets at fair value	47	35
Indexed annuities/IUL embedded derivatives, included in Contractholder funds \| Fair Value
Derivatives:
Derivative liabilities	6,456	6,542
Indexed annuities/IUL embedded derivatives, included in Contractholder funds \| Level 1
Derivatives:
Derivative liabilities	0	0
Indexed annuities/IUL embedded derivatives, included in Contractholder funds \| Level 2
Derivatives:
Derivative liabilities	0	0
Indexed annuities/IUL embedded derivatives, included in Contractholder funds \| Level 3
Derivatives:
Derivative liabilities	6,456	6,542
Interest rate and foreign currency swaps, included in Accounts payable and accrued liabilities \| Fair Value
Derivatives:
Derivative liabilities	298	12
Interest rate and foreign currency swaps, included in Accounts payable and accrued liabilities \| Level 1
Derivatives:
Derivative liabilities	0	0
Interest rate and foreign currency swaps, included in Accounts payable and accrued liabilities \| Level 2
Derivatives:
Derivative liabilities	279	3
Interest rate and foreign currency swaps, included in Accounts payable and accrued liabilities \| Level 3
Derivatives:
Derivative liabilities	19	9
Reinsurance related embedded derivatives, included in Funds withheld for reinsurance liabilities \| Fair Value
Derivatives:
Reinsurance related embedded derivatives, included in Funds withheld for reinsurance liabilities	(545)	75
Reinsurance related embedded derivatives, included in Funds withheld for reinsurance liabilities \| Level 1
Derivatives:
Reinsurance related embedded derivatives, included in Funds withheld for reinsurance liabilities	0	0
Reinsurance related embedded derivatives, included in Funds withheld for reinsurance liabilities \| Level 2
Derivatives:
Reinsurance related embedded derivatives, included in Funds withheld for reinsurance liabilities	(545)	75
Reinsurance related embedded derivatives, included in Funds withheld for reinsurance liabilities \| Level 3
Derivatives:
Reinsurance related embedded derivatives, included in Funds withheld for reinsurance liabilities	0	0
Asset-backed securities
Assets
Fixed maturity securities, available-for-sale:	17,849	18,732
Asset-backed securities \| Fair Value
Assets
Fixed maturity securities, available-for-sale:	17,849	18,732
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:	6,642	8,638
Asset-backed securities \| Level 3
Assets
Fixed maturity securities, available-for-sale:	11,207	10,094
Commercial mortgage-backed securities
Assets
Fixed maturity securities, available-for-sale:	4,106	5,155
Commercial mortgage-backed securities \| Fair Value
Assets
Fixed maturity securities, available-for-sale:	4,106	5,155
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:	4,102	5,155
Commercial mortgage-backed securities \| Level 3
Assets
Fixed maturity securities, available-for-sale:	4	0
Corporates
Assets
Fixed maturity securities, available-for-sale:	22,947	23,250
Corporates \| Fair Value
Assets
Fixed maturity securities, available-for-sale:	22,947	23,250
Corporates \| Level 1
Assets
Fixed maturity securities, available-for-sale:	37	40
Corporates \| Level 2
Assets
Fixed maturity securities, available-for-sale:	19,275	20,086
Corporates \| Level 3
Assets
Fixed maturity securities, available-for-sale:	3,635	3,124
Hybrids
Assets
Fixed maturity securities, available-for-sale:	599	609
Hybrids \| Fair Value
Assets
Fixed maturity securities, available-for-sale:	599	609
Hybrids \| Level 1
Assets
Fixed maturity securities, available-for-sale:	30	36
Hybrids \| Level 2
Assets
Fixed maturity securities, available-for-sale:	555	558
Hybrids \| Level 3
Assets
Fixed maturity securities, available-for-sale:	14	15
Municipals \| Fair Value
Assets
Fixed maturity securities, available-for-sale:	1,224	1,355
Municipals \| Level 1
Assets
Fixed maturity securities, available-for-sale:	0	0
Municipals \| Level 2
Assets
Fixed maturity securities, available-for-sale:	1,221	1,352
Municipals \| Level 3
Assets
Fixed maturity securities, available-for-sale:	3	3
Residential mortgage-backed securities
Assets
Fixed maturity securities, available-for-sale:	3,360	2,845
Residential mortgage-backed securities \| Fair Value
Assets
Fixed maturity securities, available-for-sale:	3,360	2,845
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:	3,360	2,842
Residential mortgage-backed securities \| Level 3
Assets
Fixed maturity securities, available-for-sale:	0	3
U.S. Government
Assets
Fixed maturity securities, available-for-sale:	381	493
U.S. Government \| Fair Value
Assets
Fixed maturity securities, available-for-sale:	381	493
U.S. Government \| Level 1
Assets
Fixed maturity securities, available-for-sale:	381	493
U.S. Government \| Level 2
Assets
Fixed maturity securities, available-for-sale:	0	0
U.S. Government \| Level 3
Assets
Fixed maturity securities, available-for-sale:	0	0
Foreign Governments
Assets
Fixed maturity securities, available-for-sale:	246	261
Foreign Governments \| Fair Value
Assets
Fixed maturity securities, available-for-sale:	246	261
Fixed maturity securities, at fair value under fair value option	78
Foreign Governments \| Level 1
Assets
Fixed maturity securities, available-for-sale:	0	0
Fixed maturity securities, at fair value under fair value option	0
Foreign Governments \| Level 2
Assets
Fixed maturity securities, available-for-sale:	223	238
Fixed maturity securities, at fair value under fair value option	78
Foreign Governments \| Level 3
Assets
Fixed maturity securities, available-for-sale:	23	23
Fixed maturity securities, at fair value under fair value option	0
Preferred equity securities
Assets
Preferred and common equity securities	271	341
Preferred equity securities \| Fair Value
Assets
Preferred and common equity securities	188	239
Preferred equity securities \| Level 1
Assets
Preferred and common equity securities	106	115
Preferred equity securities \| Level 2
Assets
Preferred and common equity securities	82	117
Preferred equity securities \| Level 3
Assets
Preferred and common equity securities	0	7
Common equity securities \| Fair Value
Assets
Preferred and common equity securities	83	102
Common equity securities \| Level 1
Assets
Preferred and common equity securities	36	62
Common equity securities \| Level 2
Assets
Preferred and common equity securities	0	0
Common equity securities \| Level 3
Assets
Preferred and common equity securities	0	5
Common equity securities \| NAV
Assets
Preferred and common equity securities	47	35
Investments in unconsolidated affiliates \| Fair Value
Assets
Investments in unconsolidated affiliates	256	270
Investments in unconsolidated affiliates \| Level 1
Assets
Investments in unconsolidated affiliates	0	0
Investments in unconsolidated affiliates \| Level 2
Assets
Investments in unconsolidated affiliates	0	0
Investments in unconsolidated affiliates \| Level 3
Assets
Investments in unconsolidated affiliates	256	270
Other long-term investments \| Fair Value
Assets
Other long-term investments	296	289
Other long-term investments \| Level 1
Assets
Other long-term investments	0	0
Other long-term investments \| Level 2
Assets
Other long-term investments	296	248
Other long-term investments \| Level 3
Assets
Other long-term investments	$ 0	$ 41

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