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Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy Measurements of Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Financial assets
Equity securities:	$ 1,522		$ 1,404
Short-term investments	3,674		2,397
Derivative assets	1,900		227
Other assets – market risk benefit assets	758		34
Separate account assets	1,302		1,189
Financial liabilities
Market risk benefits	3,725		34
Other liabilities – derivative liabilities	38		0
Separate account liabilities	1,302	$ 1,266	1,189	$ 1,090	$ 1,145	$ 1,045
Separate accounts not subject to fair value hierarchy	22		26
Total Fair Value
Financial assets
Available-for-sale fixed maturity securities:	45,683		12,877
Equity securities:	1,522		1,404
Real estate at fair value	1,282		0
Real estate partnerships at fair value	1,014		0
Investment funds	115		0
Short-term investments	3,675		2,397
Derivative assets	1,886		227
Collaterals received on derivatives (excluding excess collateral)	(1,825)		(226)
Separately managed accounts	98		105
Other	556		0
Cash and cash equivalents	13,873		3,192
Other assets – market risk benefit assets	758		34
Separate account assets	1,280		1,163
Total financial assets	69,917		21,173
Financial liabilities
Policyholders’ account balances – embedded derivative	1,771		873
Market risk benefits	3,725		34
Funds withheld for reinsurance liabilities – embedded derivatives	278		0
Other liabilities – derivative liabilities	26		0
Separate account liabilities	1,280		1,163
Total financial liabilities	7,080		2,070
Total Fair Value | U.S. treasury and government
Financial assets
Available-for-sale fixed maturity securities:	78		62
Total Fair Value | U.S. states and political subdivisions
Financial assets
Available-for-sale fixed maturity securities:	3,383		578
Total Fair Value | Foreign governments
Financial assets
Available-for-sale fixed maturity securities:	429		9
Total Fair Value | Corporate debt securities
Financial assets
Available-for-sale fixed maturity securities:	31,473		10,784
Total Fair Value | Residential mortgage-backed securities
Financial assets
Available-for-sale fixed maturity securities:	1,120		127
Total Fair Value | Commercial mortgage-backed securities
Financial assets
Available-for-sale fixed maturity securities:	2,792		0
Total Fair Value | Collateralized debt securities
Financial assets
Available-for-sale fixed maturity securities:	6,408		1,317
Total Fair Value | Common stock
Financial assets
Equity securities:	1,246		1,307
Total Fair Value | Preferred stock
Financial assets
Equity securities:	272		97
Total Fair Value | Private equity and other
Financial assets
Equity securities:	4		0
Level 1
Financial assets
Available-for-sale fixed maturity securities:	77		62
Equity securities:	580		336
Real estate at fair value	0		0
Real estate partnerships at fair value	0		0
Investment funds	0		0
Short-term investments	2,306		1,100
Derivative assets	0		0
Collaterals received on derivatives (excluding excess collateral)	(1,825)		0
Separately managed accounts	0		0
Other	0		0
Cash and cash equivalents	13,873		3,192
Other assets – market risk benefit assets	0		0
Separate account assets	201		406
Total financial assets	15,212		5,096
Financial liabilities
Policyholders’ account balances – embedded derivative	0		0
Market risk benefits	0		0
Funds withheld for reinsurance liabilities – embedded derivatives	0		0
Other liabilities – derivative liabilities	0		0
Separate account liabilities	201		406
Total financial liabilities	201		406
Level 1 | U.S. treasury and government
Financial assets
Available-for-sale fixed maturity securities:	77		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		0
Level 1 | Collateralized debt securities
Financial assets
Available-for-sale fixed maturity securities:	0		0
Level 1 | Common stock
Financial assets
Equity securities:	554		314
Level 1 | Preferred stock
Financial assets
Equity securities:	26		22
Level 1 | Private equity and other
Financial assets
Equity securities:	0		0
Level 2
Financial assets
Available-for-sale fixed maturity securities:	39,265		9,700
Equity securities:	176		0
Real estate at fair value	0		0
Real estate partnerships at fair value	0		0
Investment funds	0		0
Short-term investments	566		0
Derivative assets	1,621		0
Collaterals received on derivatives (excluding excess collateral)	0		0
Separately managed accounts	0		0
Other	0		0
Cash and cash equivalents	0		0
Other assets – market risk benefit assets	0		0
Separate account assets	1,079		757
Total financial assets	42,707		10,457
Financial liabilities
Policyholders’ account balances – embedded derivative	0		0
Market risk benefits	0		0
Funds withheld for reinsurance liabilities – embedded derivatives	0		0
Other liabilities – derivative liabilities	26		0
Separate account liabilities	1,079		757
Total financial liabilities	1,105		757
Level 2 | U.S. treasury and government
Financial assets
Available-for-sale fixed maturity securities:	1		0
Level 2 | U.S. states and political subdivisions
Financial assets
Available-for-sale fixed maturity securities:	3,323		578
Level 2 | Foreign governments
Financial assets
Available-for-sale fixed maturity securities:	429		9
Level 2 | Corporate debt securities
Financial assets
Available-for-sale fixed maturity securities:	28,292		8,570
Level 2 | Residential mortgage-backed securities
Financial assets
Available-for-sale fixed maturity securities:	1,096		127
Level 2 | Commercial mortgage-backed securities
Financial assets
Available-for-sale fixed maturity securities:	2,773		0
Level 2 | Collateralized debt securities
Financial assets
Available-for-sale fixed maturity securities:	3,351		416
Level 2 | Common stock
Financial assets
Equity securities:	2		0
Level 2 | Preferred stock
Financial assets
Equity securities:	174		0
Level 2 | Private equity and other
Financial assets
Equity securities:	0		0
Level 3
Financial assets
Available-for-sale fixed maturity securities:	6,341		3,115
Equity securities:	766		1,068
Real estate at fair value	1,282		0
Real estate partnerships at fair value	1,014		0
Investment funds	115		0
Short-term investments	803		1,297
Derivative assets	265		227
Collaterals received on derivatives (excluding excess collateral)	0		(226)
Separately managed accounts	98		105
Other	556		0
Cash and cash equivalents	0		0
Other assets – market risk benefit assets	758		34
Separate account assets	0		0
Total financial assets	11,998		5,620
Financial liabilities
Policyholders’ account balances – embedded derivative	1,771		873
Market risk benefits	3,725		34
Funds withheld for reinsurance liabilities – embedded derivatives	278		0
Other liabilities – derivative liabilities	0		0
Separate account liabilities	0		0
Total financial liabilities	5,774		907
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:	60		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:	3,181		2,214
Level 3 | Residential mortgage-backed securities
Financial assets
Available-for-sale fixed maturity securities:	24		0
Level 3 | Commercial mortgage-backed securities
Financial assets
Available-for-sale fixed maturity securities:	19		0
Level 3 | Collateralized debt securities
Financial assets
Available-for-sale fixed maturity securities:	3,057		901
Level 3 | Common stock
Financial assets
Equity securities:	690		993
Level 3 | Preferred stock
Financial assets
Equity securities:	72		75
Level 3 | Private equity and other
Financial assets
Equity securities:	4		$ 0
Fair Value Measured at Net Asset Value Per Share
Financial assets
Investment funds	$ 397

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