Business and Basis of Presentation (Summary of Adoption of New Guidance on Consolidated Statement of Financial Position) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs	$ 7,097,511	$ 6,930,425	[1]	$ 7,029,308	$ 2,493,082	$ 2,493,082
Reinsurance recoverables	38,709,651	37,096,562
Deferred sales inducements	351,424	381,504	[1]
Income tax assets	1,737,651	1,694,751	[1]
Market risk benefits assets	2,367,243	1,393,237	[1]
Other assets	2,078,938	1,331,427	[1]
TOTAL ASSETS	213,309,041	193,473,118
Policyholders’ account balances	53,012,800	41,912,536	[1]	35,730,680
Future policy benefits	23,205,205	20,829,033	[1]	$ 21,510,749
Market risk benefit liabilities	5,144,401	5,521,601	[1]
Other liabilities	5,170,308	3,597,373	[1]
Total liabilities	208,787,616	188,436,923
Retained Earnings (accumulated deficit)	(532,951)	(994,154)	[1]
Accumulated other comprehensive income (loss)	(30,920)	(10,065)	[1]
Equity, Attributable to Parent	4,491,231	5,036,195
TOTAL LIABILITIES AND EQUITY	$ 213,309,041	193,473,118
As Originally Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs		6,616,097				$ 2,433,936
Reinsurance recoverables		34,561,825
Deferred sales inducements		275,574
Income tax assets		1,873,740
Market risk benefits assets		0
Other assets		1,327,393
TOTAL ASSETS		189,299,841
Policyholders’ account balances		41,748,241
Future policy benefits		23,204,533
Market risk benefit liabilities		0
Other liabilities		3,407,156
Total liabilities		184,936,310
Retained Earnings (accumulated deficit)		(95,583)
Accumulated other comprehensive income (loss)		(1,581,300)
Equity, Attributable to Parent		4,363,531
TOTAL LIABILITIES AND EQUITY		189,299,841
Effect of Change
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs		314,328			$ 74,702
Reinsurance recoverables		2,534,737
Deferred sales inducements		105,930
Income tax assets		(178,989)
Market risk benefits assets		1,393,237
Other assets		4,034
TOTAL ASSETS		4,173,277
Policyholders’ account balances		164,295
Future policy benefits		(2,375,500)
Market risk benefit liabilities		5,521,601
Other liabilities		190,217
Total liabilities		3,500,613
Retained Earnings (accumulated deficit)		(898,571)
Accumulated other comprehensive income (loss)		1,571,235
Equity, Attributable to Parent		672,664
TOTAL LIABILITIES AND EQUITY		$ 4,173,277

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