Business and Basis of Presentation (Summary Of Adoption Of New Guidance On Unaudited Interim Consolidated Statement of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended							9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022		Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
REVENUES
Premiums	$ 85,140			$ 61,716	[1]			$ 251,761	$ 185,545	[1]
Policy charges and fee income	346,481			369,946	[1]			1,096,508	857,881	[1]
Other income (loss)	(63,555)			(161,407)	[1]			286,750	(795,129)	[1]
Realized Investment gains (losses), net	(468,256)			97,271	[1]			(581,241)	810,771	[2]
Change in value of market risk benefits, net of related hedging gain (loss)	(247,471)			(80,078)	[1]			(266,156)	(1,235,415)	[2]
TOTAL REVENUES	169,957			566,764				2,168,755	625,419
BENEFITS AND EXPENSES
Policyholders' benefits	145,409			87,685	[1]			397,552	367,543	[1]
Interest credited to policyholders’ account balances	163,074			97,649	[1]			467,112	318,586	[1]
Amortization of deferred policy acquisition costs	132,242			128,420	[1]			398,884	384,384	[1]
General, administrative and other expenses	271,473			243,205	[1]			858,809	795,922	[1]
TOTAL BENEFITS AND EXPENSES	718,763			554,024				2,123,387	1,909,300
INCOME (LOSS) FROM OPERATIONS BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF OPERATING JOINT VENTURE	548,806			(12,740)				(45,368)	1,283,881
Income tax expense (benefit)	(104,883)			(7,660)	[1]			(8,318)	(350,214)	[1]
INCOME (LOSS) FROM OPERATIONS BEFORE EQUITY IN EARNINGS OF OPERATING JOINT VENTURE	(443,923)			20,400				53,686	(933,667)
NET INCOME (LOSS)	(444,327)	$ 217,598	$ 279,679	20,147		$ (547,018)	$ (482,207)	52,950	(1,009,078)	[2]
Other comprehensive income (loss), before tax:
Net unrealized investment gains (losses)	(618,892)			(790,108)	[1]			(500,018)	(2,608,049)	[1]
Interest rate remeasurement of future policy benefits	90,909			97,171	[1]			73,321	346,865	[1]
Gain (loss) from changes in non-performance risk on market risk benefits	(429,966)			(3,233)	[1]			(497,289)	1,786,353	[1]
Total	(960,784)			(699,819)				(923,555)	(486,350)
Less: Income tax expense (benefit) related to other comprehensive income (loss)	(201,437)			(146,711)	[1]			(194,021)	(100,893)	[1]
Other Comprehensive Income (Loss), Net of Tax	(759,347)	$ (386,891)	$ 416,704	(553,108)		$ 101,092	$ 66,559	(729,534)	(385,457)
Comprehensive income (loss)	$ (1,203,674)			(532,961)				$ (676,584)	(1,394,535)
As Previously Reported
REVENUES
Premiums				63,354					195,020
Policy charges and fee income				438,781					1,256,155
Other income (loss)				(163,701)					(803,321)
Realized Investment gains (losses), net				23,958					1,522,774
Change in value of market risk benefits, net of related hedging gain (loss)				0					0
TOTAL REVENUES				641,708					2,972,394
BENEFITS AND EXPENSES
Policyholders' benefits				122,139					500,009
Change in estimates of liability of future policy benefits				0					0
Interest credited to policyholders’ account balances				105,170					391,640
Amortization of deferred policy acquisition costs				96,048					731,768
General, administrative and other expenses				241,370					795,514
TOTAL BENEFITS AND EXPENSES				564,727					2,418,931
INCOME (LOSS) FROM OPERATIONS BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF OPERATING JOINT VENTURE				(76,981)					(553,463)
Income tax expense (benefit)				(1,983)					69,090
INCOME (LOSS) FROM OPERATIONS BEFORE EQUITY IN EARNINGS OF OPERATING JOINT VENTURE				78,964					484,373
NET INCOME (LOSS)				78,711					408,962
Other comprehensive income (loss), before tax:
Net unrealized investment gains (losses)				(862,220)					(2,775,879)
Interest rate remeasurement of future policy benefits				0					0
Gain (loss) from changes in non-performance risk on market risk benefits				0					0
Total				(865,869)					(2,787,398)
Less: Income tax expense (benefit) related to other comprehensive income (loss)				(181,602)					(584,114)
Other Comprehensive Income (Loss), Net of Tax				(684,267)					(2,203,284)
Comprehensive income (loss)				(605,556)					(1,794,322)
Change of Effect
REVENUES
Premiums				(1,638)					(9,475)
Policy charges and fee income				(68,835)					(398,274)
Other income (loss)				2,294					8,192
Realized Investment gains (losses), net				73,313					(712,003)
Change in value of market risk benefits, net of related hedging gain (loss)				(80,078)					(1,235,415)
TOTAL REVENUES				(74,944)					(2,346,975)
BENEFITS AND EXPENSES
Policyholders' benefits				(34,454)					(132,466)
Change in estimates of liability of future policy benefits				(2,935)					42,865
Interest credited to policyholders’ account balances				(7,521)					(73,054)
Amortization of deferred policy acquisition costs				32,372					(347,384)
General, administrative and other expenses				1,835					408
TOTAL BENEFITS AND EXPENSES				(10,703)					(509,631)
INCOME (LOSS) FROM OPERATIONS BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF OPERATING JOINT VENTURE				64,241					1,837,344
Income tax expense (benefit)				(5,677)					(419,304)
INCOME (LOSS) FROM OPERATIONS BEFORE EQUITY IN EARNINGS OF OPERATING JOINT VENTURE				(58,564)					(1,418,040)
NET INCOME (LOSS)				(58,564)					(1,418,040)
Other comprehensive income (loss), before tax:
Net unrealized investment gains (losses)				72,112					167,830
Interest rate remeasurement of future policy benefits				97,171					346,865
Gain (loss) from changes in non-performance risk on market risk benefits				(3,233)					1,786,353
Total				166,050					2,301,048
Less: Income tax expense (benefit) related to other comprehensive income (loss)				34,891					483,221
Other Comprehensive Income (Loss), Net of Tax				131,159					1,817,827
Comprehensive income (loss)				72,595					399,787
Out of period adjustment
BENEFITS AND EXPENSES
INCOME (LOSS) FROM OPERATIONS BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF OPERATING JOINT VENTURE				$ 73,000					$ 72,000

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

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