Investments (Realized Investment Gains Losses, Net) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Gain (Loss) on Investments [Line Items]
Realized investment gains (losses), net	$ 1,041,435	$ (5,295,406)	$ (62,976)
Fixed maturities
Schedule of Gain (Loss) on Investments [Line Items]
Realized investment gains (losses), net	(74,005)	(3,514)	(7,236)
Commercial mortgage and other loans
Schedule of Gain (Loss) on Investments [Line Items]
Realized investment gains (losses), net	(18,201)	1,535	(226)
Other invested assets
Schedule of Gain (Loss) on Investments [Line Items]
Realized investment gains (losses), net	(78,671)	(2,737)	(287)
Derivatives
Schedule of Gain (Loss) on Investments [Line Items]
Realized investment gains (losses), net	1,212,366	(5,291,043)	(55,003)
Short-term investments and cash equivalents
Schedule of Gain (Loss) on Investments [Line Items]
Realized investment gains (losses), net	$ (54)	$ 353	$ (224)