Deferred Policy Acquisition Costs (Balance of and Changes in DAC) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	$ 6,830,972	$ 2,433,936	$ 1,855,698
Capitalization of commissions, sales and issue expenses	962,579	1,057,030	758,469
Amortization-Impact of assumption and experience unlocking and true-ups	(289,619)	40,482	(27,844)
Amortization-All other	(567,766)	(382,600)	(112,718)
Change due to unrealized investment gains and losses	251,513	(81,031)	(39,861)
Other	(571,582)	3,763,155	192
Balance, end of year	$ 6,616,097	$ 6,830,972	$ 2,433,936