Reinsurance (Balance Sheet Reinsurance Results) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Oct. 01, 2024	Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Effects of Reinsurance [Line Items]
Reinsurance recoverables and deposit receivables	$ 48,247,817		$ 40,256,800
Policy loans	(1,541,480)		(1,472,677)
Deferred policy acquisition costs	7,807,060		7,144,736	[1]	$ 6,956,197	$ 7,029,308
Deferred sales inducements	(322,351)		(351,424)
Total market risk benefit assets	2,637,363		2,367,243
Other assets	1,850,800		440,276	[2]
Future policy benefits	25,113,767		23,205,205		20,829,033
Total market risk benefit liabilities	4,281,244		5,156,858	[1]
Reinsurance Payable And Funds Withheld Payable	8,611,141		2,738,979	[1],[2]
Other Liabilities	4,199,803		2,424,179	[2]
Deferred reinsurance loss	1,530,394		255,115		$ 292,893	$ 333,003
Wilton Re
Effects of Reinsurance [Line Items]
Reinsurance recoverables and deposit receivables		$ 7,478,000
Deferred reinsurance loss		$ 979,000
Impacts of Reinsurance
Effects of Reinsurance [Line Items]
Reinsurance recoverables and deposit receivables	48,247,817		40,256,800
Policy loans	(1,143,726)		(1,082,584)
Deferred policy acquisition costs	(3,319,067)		(3,189,110)
Deferred sales inducements	(32,573)		(35,313)
Total market risk benefit assets	1,145,580		1,165,378
Other assets	1,538,231		258,748
Policyholders’ account balances	5,567,661		5,977,108
Future policy benefits	7,443,997		7,026,209
Total market risk benefit liabilities	302,310		251,318
Reinsurance Payable And Funds Withheld Payable	8,611,141		2,738,979
Other Liabilities	3,282,713		1,651,733
Unaffiliated activity
Effects of Reinsurance [Line Items]
Total market risk benefit assets	804,015		745,662
Other assets	1,118,974		176,436
Policyholders’ account balances	1,665,998		1,830,579
Future policy benefits	160		453
Total market risk benefit liabilities	151,432		133,374
Reinsurance Payable And Funds Withheld Payable	3,360,901		1,620,504
Other Liabilities	257,929		287,551
Unaffiliated activity
Effects of Reinsurance [Line Items]
Policy loans	(48,644)		0
Deferred policy acquisition costs	(637,555)		$ 71,315
Unaffiliated activity | Wilton Re
Effects of Reinsurance [Line Items]
Deferred policy acquisition costs	699,000
Deferred reinsurance loss	$ 979,000

[1] Amounts reflect revision to prior period Financial Statements. See Note 17 for additional information.

[2] Prior period amounts have been reclassified to conform to current period presentation.