Equity (Net Unrealized Investment Gains (Losses) on AFS Fixed Maturity Securities on which an allowance for credit losses has been recognized and All Other Investments) (Details) $ in Thousands	3 Months Ended
Mar. 31, 2021 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,533,059
Ending balance	120,164
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	2
Net investment gains (losses) on investments arising during the period	8
Reclassification adjustment for (gains) losses included in net income	0
Reclassification due to allowance for credit losses recorded during the period	35
Impact of net unrealized investment (gains) losses on DAC and other costs	0
Impact of net unrealized investment (gains) losses on future policy benefits and other liabilities	0
Ending balance	45
Net Unrealized Investment Gains (Losses) on All Other Investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	2,369,107
Net investment gains (losses) on investments arising during the period	(963,933)
Reclassification adjustment for (gains) losses included in net income	(1,093,820)
Reclassification due to allowance for credit losses recorded during the period	(35)
Impact of net unrealized investment (gains) losses on DAC and other costs	0
Impact of net unrealized investment (gains) losses on future policy benefits and other liabilities	0
Ending balance	311,319
Deferred Policy Acquisition Costs and Other Costs
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(363,429)
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 on DAC and other costs	233,899
Impact of net unrealized investment (gains) losses on future policy benefits and other liabilities	0
Ending balance	(129,530)
Future Policy Benefits and Other Liabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(63,159)
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 on DAC and other costs	0
Impact of net unrealized investment (gains) losses on future policy benefits and other liabilities	35,322
Ending balance	(27,837)
Deferred Income Tax (Liability) Benefit
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(408,754)
Net investment gains (losses) on investments arising during the period	202,424
Reclassification adjustment for (gains) losses included in net income	229,702
Reclassification due to allowance for credit losses recorded during the period	0
Impact of net unrealized investment (gains) losses on DAC and other costs	(49,119)
Impact of net unrealized investment (gains) losses on future policy benefits and other liabilities	(7,417)
Ending balance	(33,164)
Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1,533,767
Net investment gains (losses) on investments arising during the period	(761,501)
Reclassification adjustment for (gains) losses included in net income	(864,118)
Reclassification due to allowance for credit losses recorded during the period	0
Impact of net unrealized investment (gains) losses on DAC and other costs	184,780
Impact of net unrealized investment (gains) losses on future policy benefits and other liabilities	27,905
Ending balance	$ 120,833

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- Definition

Other Comprehensive Income for Unrealized Investment Gain Loss related to Policyholder's account balance Arising during the Period Net of Tax

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Other Comprehensive Income for Unrealized Investment (Gain) Loss related to deferred policy acquisition costs, deferred sales inducements and valuation of business acquired Arising during the Period Net of Tax

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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