Equity (Net Unrealized Investment Gains (Losses) in AOCI on AFS Fixed Maturity Securities with Allowance for Credit Losses and All Other Investments) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2025 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Begining Balance	$ 4,701,980
Ending Balance	5,681,715
Net Unrealized Investment Gains (Losses) on Available-for-Sale Fixed Maturity Securities on which an allowance for credit losses has been recognized
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Begining Balance	893
Net investment gains (losses) on investments arising during the period	2,882
Reclassification adjustment for (gains) losses included in net income	(3,237)
Reclassification due to allowance for credit losses recorded during the period	363
Impact of net unrealized investment (gains) losses	0
Ending Balance	901
Net Unrealized Investment Gains (Losses) on All Other Investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Begining Balance	(1,847,178)
Net investment gains (losses) on investments arising during the period	640,422
Reclassification adjustment for (gains) losses included in net income	70,083
Reclassification due to allowance for credit losses recorded during the period	(363)
Impact of net unrealized investment (gains) losses	0
Ending Balance	(1,137,036)
Other Costs
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Begining Balance	(583,709)
Net investment gains (losses) on investments arising during the period	0
Reclassification adjustment for (gains) losses included in net income	0
Reclassification due to allowance for credit losses recorded during the period	0
Impact of net unrealized investment (gains) losses	198,327
Ending Balance	(385,382)
Future Policy Benefits and Policyholders’ Account Balances and other liabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Begining Balance	920,455
Net investment gains (losses) on investments arising during the period	0
Reclassification adjustment for (gains) losses included in net income	0
Reclassification due to allowance for credit losses recorded during the period	0
Impact of net unrealized investment (gains) losses	(305,249)
Ending Balance	615,206
Income Tax Benefit (Expense)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Begining Balance	316,837
Net investment gains (losses) on investments arising during the period	(134,951)
Reclassification adjustment for (gains) losses included in net income	(14,023)
Reclassification due to allowance for credit losses recorded during the period	0
Impact of net unrealized investment (gains) losses	22,460
Ending Balance	190,323
Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Begining Balance	(1,192,702)
Net investment gains (losses) on investments arising during the period	508,353
Reclassification adjustment for (gains) losses included in net income	52,823
Reclassification due to allowance for credit losses recorded during the period	0
Impact of net unrealized investment (gains) losses	(84,462)
Ending Balance	$ (715,988)