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Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy Measurements of Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financial assets
Equity securities, at fair value	$ 1,142	$ 1,404
Short-term investments, at estimated fair value	4,177	2,397
Derivative assets	1,346	227
Other assets - market risk benefits	856	34
Separate account assets	1,343	1,189
Financial liabilities
Market risk benefits	3,655	34
Separate account liabilities	1,343	1,189	$ 1,045
Separate account, asset (liability), not subject to fair value	31	26
Total Fair Value
Financial assets
Available-for-sale fixed maturity securities	47,292	12,877
Equity securities, at fair value	1,142	1,404
Real estate at fair value	1,283
Real estate partnerships	932
Investments funds	124
Short-term investments, at estimated fair value	4,177	2,397
Derivative assets	1,341	227
Collaterals received on derivatives (excluding excess collateral)	(1,298)	(226)
Separately managed accounts	71	105
Other	315
Cash and cash equivalents	11,330	3,192
Other assets - market risk benefits	857	34
Separate account assets	1,312	1,163
Total financial assets	68,878	21,173
Financial liabilities
Policyholders’ account balances – embedded derivative	1,123	872
Market risk benefits	3,655	34
Funds withheld for reinsurance liabilities	37
Separate account liabilities	1,312	1,163
Total financial liabilities	6,127	2,069
Total Fair Value | U.S. treasury and government
Financial assets
Available-for-sale fixed maturity securities	86	62
Total Fair Value | U.S. states and political subdivisions
Financial assets
Available-for-sale fixed maturity securities	3,207	578
Total Fair Value | Foreign governments
Financial assets
Available-for-sale fixed maturity securities	1,541	9
Total Fair Value | Corporate debt securities
Financial assets
Available-for-sale fixed maturity securities	32,848	10,784
Total Fair Value | Residential mortgage-backed securities
Financial assets
Available-for-sale fixed maturity securities	1,106	127
Total Fair Value | Commercial mortgage-backed securities
Financial assets
Available-for-sale fixed maturity securities	2,796
Total Fair Value | Collateralized debt securities
Financial assets
Available-for-sale fixed maturity securities	5,708	1,317
Total Fair Value | Common stock
Financial assets
Equity securities, at fair value	747	1,307
Total Fair Value | Preferred Stock
Financial assets
Equity securities, at fair value	391	97
Total Fair Value | Private equity and other
Financial assets
Equity securities, at fair value	4
Level 1
Financial assets
Available-for-sale fixed maturity securities	76	62
Equity securities, at fair value	628	336
Real estate at fair value	0
Real estate partnerships	0
Investments funds	0
Short-term investments, at estimated fair value	3,003	1,100
Derivative assets	0	0
Collaterals received on derivatives (excluding excess collateral)	(1,298)	0
Separately managed accounts	0	0
Other	0
Cash and cash equivalents	11,330	3,192
Other assets - market risk benefits	0	0
Separate account assets	258	406
Total financial assets	13,997	5,096
Financial liabilities
Policyholders’ account balances – embedded derivative	0	0
Market risk benefits	0	0
Funds withheld for reinsurance liabilities	0
Separate account liabilities	258	406
Total financial liabilities	258	406
Level 1 | U.S. treasury and government
Financial assets
Available-for-sale fixed maturity securities	76	62
Level 1 | U.S. states and political subdivisions
Financial assets
Available-for-sale fixed maturity securities	0	0
Level 1 | Foreign governments
Financial assets
Available-for-sale fixed maturity securities	0	0
Level 1 | Corporate debt securities
Financial assets
Available-for-sale fixed maturity securities	0	0
Level 1 | Residential mortgage-backed securities
Financial assets
Available-for-sale fixed maturity securities	0	0
Level 1 | Commercial mortgage-backed securities
Financial assets
Available-for-sale fixed maturity securities	0
Level 1 | Collateralized debt securities
Financial assets
Available-for-sale fixed maturity securities	0	0
Level 1 | Common stock
Financial assets
Equity securities, at fair value	606	314
Level 1 | Preferred Stock
Financial assets
Equity securities, at fair value	22	22
Level 1 | Private equity and other
Financial assets
Equity securities, at fair value	0
Level 2
Financial assets
Available-for-sale fixed maturity securities	41,779	9,700
Equity securities, at fair value	37	0
Real estate at fair value	0
Real estate partnerships	0
Investments funds	0
Short-term investments, at estimated fair value	821	0
Derivative assets	1,118	0
Collaterals received on derivatives (excluding excess collateral)	0	0
Separately managed accounts	0	0
Other	11
Cash and cash equivalents	0	0
Other assets - market risk benefits	0	0
Separate account assets	1,054	757
Total financial assets	44,820	10,457
Financial liabilities
Policyholders’ account balances – embedded derivative	0	0
Market risk benefits	0	0
Funds withheld for reinsurance liabilities	0
Separate account liabilities	1,054	757
Total financial liabilities	1,054	757
Level 2 | U.S. treasury and government
Financial assets
Available-for-sale fixed maturity securities	10	0
Level 2 | U.S. states and political subdivisions
Financial assets
Available-for-sale fixed maturity securities	3,151	578
Level 2 | Foreign governments
Financial assets
Available-for-sale fixed maturity securities	1,541	9
Level 2 | Corporate debt securities
Financial assets
Available-for-sale fixed maturity securities	30,192	8,570
Level 2 | Residential mortgage-backed securities
Financial assets
Available-for-sale fixed maturity securities	1,087	127
Level 2 | Commercial mortgage-backed securities
Financial assets
Available-for-sale fixed maturity securities	2,721
Level 2 | Collateralized debt securities
Financial assets
Available-for-sale fixed maturity securities	3,077	416
Level 2 | Common stock
Financial assets
Equity securities, at fair value	25	0
Level 2 | Preferred Stock
Financial assets
Equity securities, at fair value	12	0
Level 2 | Private equity and other
Financial assets
Equity securities, at fair value	0
Level 3
Financial assets
Available-for-sale fixed maturity securities	5,437	3,115
Equity securities, at fair value	477	1,068
Real estate at fair value	1,283
Real estate partnerships	932
Investments funds	124
Short-term investments, at estimated fair value	353	1,297
Derivative assets	223	227
Collaterals received on derivatives (excluding excess collateral)	0	(226)
Separately managed accounts	71	105
Other	304
Cash and cash equivalents	0	0
Other assets - market risk benefits	857	34
Separate account assets	0	0
Total financial assets	10,061	5,620
Financial liabilities
Policyholders’ account balances – embedded derivative	1,123	872
Market risk benefits	3,655	34
Funds withheld for reinsurance liabilities	37
Separate account liabilities	0	0
Total financial liabilities	4,815	906
Level 3 | U.S. treasury and government
Financial assets
Available-for-sale fixed maturity securities	0	0
Level 3 | U.S. states and political subdivisions
Financial assets
Available-for-sale fixed maturity securities	56	0
Level 3 | Foreign governments
Financial assets
Available-for-sale fixed maturity securities	0	0
Level 3 | Corporate debt securities
Financial assets
Available-for-sale fixed maturity securities	2,656	2,214
Level 3 | Residential mortgage-backed securities
Financial assets
Available-for-sale fixed maturity securities	19	0
Level 3 | Commercial mortgage-backed securities
Financial assets
Available-for-sale fixed maturity securities	75
Level 3 | Collateralized debt securities
Financial assets
Available-for-sale fixed maturity securities	2,631	901
Level 3 | Common stock
Financial assets
Equity securities, at fair value	116	993
Level 3 | Preferred Stock
Financial assets
Equity securities, at fair value	357	75
Level 3 | Private equity and other
Financial assets
Equity securities, at fair value	4
Fair Value Measured at Net Asset Value Per Share
Financial assets
Investments funds	$ 353	$ 1,600

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