Net Investment Gains (Losses) (Change in Unrealized Gains (Losses) of Available For Sales Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	$ (430,784)	$ 28,804	$ (970,232)	$ (84,931)
Income tax benefit (expense)	93,776	(5,532)	209,679	18,073
Noncontrolling interests	0	(1)	(1)	(1)
Total change in unrealized gains	(337,008)	23,271	(760,554)	(66,859)
Debt securities
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	(409,647)	28,511	(949,910)	(94,058)
Fixed maturity securities with allowance for expected credit losses
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	(16,878)	(69)	(16,585)	10,286
Investment funds
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	(3,302)	762	(2,833)	(257)
Other
Realized and Unrealized Investment Gains Losses [Line Items]
Total change in unrealized investment (losses) gains	$ (957)	$ (400)	$ (904)	$ (902)