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	9 Months Ended
	Sep. 30, 2022 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 347,435
Ending Balance	(1,855,849)
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]
Beginning Balance	3,685
Net investment gains (losses) on investments arising during the period	4
Reclassification adjustment for (gains) losses included in net income	684
Reclassification due to allowance for credit losses recorded during the period	4
Impact of net unrealized investment (gains) losses	0
Ending Balance	4,377
Net Unrealized Investment Gains (Losses) on All Other Investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	582,704
Net investment gains (losses) on investments arising during the period	(3,098,309)
Reclassification adjustment for (gains) losses included in net income	(56,570)
Reclassification due to allowance for credit losses recorded during the period	(4)
Impact of net unrealized investment (gains) losses	0
Ending Balance	(2,572,179)
Deferred Policy Acquisition Costs and Other Costs
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	983,085
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	(2,499,252)
Ending Balance	(1,516,167)
Future Policy Benefits and Policyholders’ Account Balances and other liabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(1,115,484)
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	2,877,564
Ending Balance	1,762,080
Income Tax Benefit (Expense)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(95,281)
Net investment gains (losses) on investments arising during the period	650,446
Reclassification adjustment for (gains) losses included in net income	11,732
Reclassification due to allowance for credit losses recorded during the period	0
Impact of net unrealized investment (gains) losses	(79,421)
Ending Balance	487,476
Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	358,709
Net investment gains (losses) on investments arising during the period	(2,447,859)
Reclassification adjustment for (gains) losses included in net income	(44,154)
Reclassification due to allowance for credit losses recorded during the period	0
Impact of net unrealized investment (gains) losses	298,891
Ending Balance	$ (1,834,413)