Investments (Credit Losses Recognized In Earnings on Fixed Maturity Securities Held by the Company) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 16,969	$ 3,348	$ 40,414	$ 2,008
Additions to allowance for credit losses not previously recorded(1)	22,606	22,903	28,118	23,304
Reductions for securities sold during the period	(26)	0	(104)	(42)
Additions (reductions) on securities with previous allowance	589	(799)	3,400	(297)
Assets transferred (to) from parent and affiliates				479
Write-downs charged against the allowance	(1,394)		(33,084)
Balance, end of period	38,744	25,452	38,744	25,452
U.S. Treasury securities and obligations of U.S. government authorities and agencies
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	0	0	0	0
Additions to allowance for credit losses not previously recorded(1)	0	0	0	0
Reductions for securities sold during the period	0	0	0	0
Additions (reductions) on securities with previous allowance	0	0	0	0
Assets transferred (to) from parent and affiliates				0
Write-downs charged against the allowance	0		0
Balance, end of period	0	0	0	0
Foreign Government Securities
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	0	0	0	0
Additions to allowance for credit losses not previously recorded(1)	0	0	0	0
Reductions for securities sold during the period	0	0	0	0
Additions (reductions) on securities with previous allowance	0	0	0	0
Assets transferred (to) from parent and affiliates				0
Write-downs charged against the allowance	0		0
Balance, end of period	0	0	0	0
U.S. and Foreign Corporate Securities
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	16,969	3,343	40,414	2,000
Additions to allowance for credit losses not previously recorded(1)	19,106	22,903	24,618	23,299
Reductions for securities sold during the period	(26)	0	(104)	(42)
Additions (reductions) on securities with previous allowance	589	(794)	3,400	(284)
Assets transferred (to) from parent and affiliates				479
Write-downs charged against the allowance	(1,394)		(33,084)
Balance, end of period	35,244	25,452	35,244	25,452
Asset-backed securities
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	0	0	0	1
Additions to allowance for credit losses not previously recorded(1)	3,500	0	3,500	0
Reductions for securities sold during the period	0	0	0	0
Additions (reductions) on securities with previous allowance	0	0	0	(1)
Assets transferred (to) from parent and affiliates				0
Write-downs charged against the allowance	0		0
Balance, end of period	3,500	0	3,500	0
Commercial mortgage-backed securities
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	0	0	0	0
Additions to allowance for credit losses not previously recorded(1)	0	0	0	0
Reductions for securities sold during the period	0	0	0	0
Additions (reductions) on securities with previous allowance	0	0	0	0
Assets transferred (to) from parent and affiliates				0
Write-downs charged against the allowance	0		0
Balance, end of period	0	0	0	0
Residential Mortgage-Backed Securities
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	0	5	0	7
Additions to allowance for credit losses not previously recorded(1)	0	0	0	5
Reductions for securities sold during the period	0	0	0	0
Additions (reductions) on securities with previous allowance	0	(5)	0	(12)
Assets transferred (to) from parent and affiliates				0
Write-downs charged against the allowance	0		0
Balance, end of period	$ 0	$ 0	$ 0	$ 0