Business and Basis of Presentation (Summary of Adoption of New Guidance on Consolidated Statement of Operations) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
REVENUES
Premiums		$ 328,897	$ 265,208	[1]	$ 184,458	[1]
Policy charges and fee income		1,536,606	1,230,601	[1]	1,300,095	[1]
Other Income (loss)		744,628	(651,469)	[1]	262,420	[1]
Realized investment gains (losses), net		(1,083,660)	336,382	[2]	(386,894)	[1]
Change in value of market risk benefits, net of related hedging gain (losses)		(94,368)	(700,581)	[1]	(4,222,530)	[2]
TOTAL REVENUES		3,340,575	1,648,324		(2,110,039)
BENEFITS AND EXPENSES
Policyholders’ benefits		503,789	458,373	[1]	82,710	[1]
Change in estimates of liability for future policy benefits		3,952	55,099		27,008
Interest credited to policyholders’ account balances		655,445	445,215	[1]
Interest credited to policyholders’ account balances	[1]				(151,389)
Amortization of deferred policy acquisition costs		534,435	520,276	[1]	325,595	[1]
General, administrative and other expenses		1,151,452	1,156,464	[1]
General, administrative and other expenses	[1]				(523,774)
TOTAL BENEFITS AND EXPENSES					(239,850)
TOTAL BENEFITS AND EXPENSES		2,849,073	2,635,427
INCOME (LOSS) FROM OPERATIONS BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF SUBSIDIARIES AND OPERATING JOINT VENTURE		491,502	(987,103)		(1,870,189)
Income tax expense (benefit)		29,378	(295,535)	[1]	(474,786)	[1]
INCOME (LOSS) FROM OPERATIONS BEFORE EQUITY IN EARNINGS OF OPERATING JOINT VENTURE		462,124	(691,568)		(1,395,403)
NET INCOME (LOSS)		461,691	(766,705)	[2]	(1,394,701)	[2]
Other comprehensive income (loss), before tax:
Net unrealized investment gains (losses)			(2,254,037)		(210,486)
Interest rate remeasurement of future policy benefits			310,353		37,274
Gain (loss) from changes in non-performance risk on market risk benefits			1,440,305		(435,232)
Total		(26,482)	(512,716)		(612,335)
Less: Income tax expense (benefit) related to other comprehensive income (loss)		(5,627)	(106,197)		(128,241)
Other comprehensive income (loss), net of taxes		(20,855)	(406,519)		(484,094)
Total Comprehensive Income (Loss)		$ 440,348	(1,173,224)		(1,878,795)
As Originally Reported
REVENUES
Premiums			274,783		203,676
Policy charges and fee income			1,731,957		1,529,757
Other Income (loss)			(661,860)		267,208
Realized investment gains (losses), net			1,041,435		(5,295,406)
Change in value of market risk benefits, net of related hedging gain (losses)			0		0
TOTAL REVENUES			3,554,498		(2,542,353)
BENEFITS AND EXPENSES
Policyholders’ benefits			609,392		655,910
Change in estimates of liability for future policy benefits			0		0
Interest credited to policyholders’ account balances			517,488
Interest credited to policyholders’ account balances					(114,585)
Amortization of deferred policy acquisition costs			857,385		342,118
General, administrative and other expenses			1,154,229
General, administrative and other expenses					(523,925)
TOTAL BENEFITS AND EXPENSES			3,138,494		359,518
INCOME (LOSS) FROM OPERATIONS BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF SUBSIDIARIES AND OPERATING JOINT VENTURE			416,004		(2,901,871)
Income tax expense (benefit)			(882)		(691,439)
INCOME (LOSS) FROM OPERATIONS BEFORE EQUITY IN EARNINGS OF OPERATING JOINT VENTURE			416,886		(2,210,432)
NET INCOME (LOSS)			341,749		(2,209,730)
Other comprehensive income (loss), before tax:
Net unrealized investment gains (losses)			(2,430,238)		(247,176)
Interest rate remeasurement of future policy benefits			0		0
Gain (loss) from changes in non-performance risk on market risk benefits			0		0
Total			(2,439,575)		(251,067)
Less: Income tax expense (benefit) related to other comprehensive income (loss)			(510,840)		(52,374)
Other comprehensive income (loss), net of taxes			(1,928,735)		(198,693)
Total Comprehensive Income (Loss)			(1,586,986)		(2,408,423)
Effect of Change
REVENUES
Premiums			(9,575)		(19,218)
Policy charges and fee income			(501,356)		(229,662)
Other Income (loss)			10,391		(4,788)
Realized investment gains (losses), net			(705,053)		4,908,512
Change in value of market risk benefits, net of related hedging gain (losses)			(700,581)		(4,222,530)
TOTAL REVENUES			(1,906,174)		432,314
BENEFITS AND EXPENSES
Policyholders’ benefits			(151,019)		(573,200)
Change in estimates of liability for future policy benefits			55,099		27,008
Interest credited to policyholders’ account balances			(72,273)
Interest credited to policyholders’ account balances					(36,804)
Amortization of deferred policy acquisition costs			(337,109)		(16,523)
General, administrative and other expenses			2,235
General, administrative and other expenses					151
TOTAL BENEFITS AND EXPENSES			(503,067)		(599,368)
INCOME (LOSS) FROM OPERATIONS BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF SUBSIDIARIES AND OPERATING JOINT VENTURE			(1,403,107)		1,031,682
Income tax expense (benefit)			(294,653)		216,653
INCOME (LOSS) FROM OPERATIONS BEFORE EQUITY IN EARNINGS OF OPERATING JOINT VENTURE			(1,108,454)		815,029
NET INCOME (LOSS)			(1,108,454)		815,029
Other comprehensive income (loss), before tax:
Net unrealized investment gains (losses)			176,201		36,690
Interest rate remeasurement of future policy benefits			310,353		37,274
Gain (loss) from changes in non-performance risk on market risk benefits			1,440,305		(435,232)
Total			1,926,859		(361,268)
Less: Income tax expense (benefit) related to other comprehensive income (loss)			404,643		(75,867)
Other comprehensive income (loss), net of taxes			1,522,216		(285,401)
Total Comprehensive Income (Loss)			$ 413,762		$ 529,628

[1] Prior period amounts reflect the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.

[2] Prior period amounts reflect the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.