Equity (Net Unrealized Investment Gains (Losses) in AOCI on AFS Fixed Maturity Securities with OTTI, Allowance for Credit Losses and All Other Investments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023		Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	[1]	$ (30,961)
Ending balance		(601,877)	$ (30,961)	[1]
Accumulated Other Comprehensive Income (Loss) Related to Net Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(927,778)	(1,474,475)		$ 306,331
Ending balance		(1,192,702)	(927,778)		(1,474,475)
Net Unrealized Investment Gains (losses) | Accumulated Net Unrealized Investment Gains (Losses) Pre-Tax with Allowance
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		1,987	4,371		3,685
Net unrealized investment gains (losses) on investments arising during period		(773)	(4,482)		(149)
Reclassification adjustment for (gains) losses included in net income		(175)	(265)		831
Reclassification due to allowance for credit losses recorded during the period		(146)	2,363		4
Impact of net unrealized investment (gains) losses		0	0		0
Ending balance		893	1,987		4,371
Net Unrealized Investment Gains (losses) | Accumulated Net Unrealized Investment Gains (Losses) Pre Tax All Other
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(1,404,180)	(2,161,026)		581,718
Net unrealized investment gains (losses) on investments arising during period		(525,222)	744,727		(2,737,481)
Reclassification adjustment for (gains) losses included in net income		82,078	14,482		(5,259)
Reclassification due to allowance for credit losses recorded during the period		146	(2,363)		(4)
Impact of net unrealized investment (gains) losses		0	0		0
Ending balance		(1,847,178)	(1,404,180)		(2,161,026)
Net Unrealized Investment Gains (losses) | Deferred Policy Acquisition Costs and Other Costs
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(801,351)	(1,198,422)		835,430
Net unrealized investment gains (losses) on investments arising during period		0	0		0
Reclassification adjustment for (gains) losses included in net income		0	0		0
Reclassification due to allowance for credit losses recorded during the period		0	0		0
Impact of net unrealized investment (gains) losses		217,642	397,071		(2,033,852)
Ending balance		(583,709)	(801,351)		(1,198,422)
Net Unrealized Investment Gains (losses) | Future Policy Benefits and Policyholders' Account Balances and Other Liabilities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		1,029,098	1,488,679		(1,033,194)
Net unrealized investment gains (losses) on investments arising during period		0	0		0
Reclassification adjustment for (gains) losses included in net income		0	0		0
Reclassification due to allowance for credit losses recorded during the period		0	0		0
Impact of net unrealized investment (gains) losses		(108,643)	(459,581)		2,521,873
Ending balance		920,455	1,029,098		1,488,679
Net Unrealized Investment Gains (losses) | Income Tax Benefit (Expense)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		246,668	391,923		(81,308)
Net unrealized investment gains (losses) on investments arising during period		110,227	(155,393)		574,760
Reclassification adjustment for (gains) losses included in net income		(17,164)	(2,984)		930
Reclassification due to allowance for credit losses recorded during the period		0	0		0
Impact of net unrealized investment (gains) losses		(22,894)	13,122		(102,459)
Ending balance		316,837	246,668		391,923
Net Unrealized Investment Gains (losses) | Accumulated Other Comprehensive Income (Loss) Related to Net Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(927,778)	(1,474,475)		306,331
Net unrealized investment gains (losses) on investments arising during period		(415,768)	584,852		(2,162,870)
Reclassification adjustment for (gains) losses included in net income		64,739	11,233		(3,498)
Reclassification due to allowance for credit losses recorded during the period		0	0		0
Impact of net unrealized investment (gains) losses		86,105	(49,388)		385,562
Ending balance		$ (1,192,702)	$ (927,778)		$ (1,474,475)

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