Fair Value of Assets and Liabilities (Quantitative Info for Level 3 Inputs) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Corporate securities	$ 575,874	$ 824,270
Market risk benefits assets	2,550,164	2,367,243	$ 2,340,000
Other assets	2,596,292	2,078,938
Receivables from parent and affiliates	416,539	332,583
Market risk benefit liabilities	4,370,960	5,144,401	$ 5,090,000
Fair Value, Measurements, Recurring
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Market risk benefits assets	2,550,164	2,367,243
Other assets	363,440	224,019
Receivables from parent and affiliates	330,814	147,984
Market risk benefit liabilities	4,370,960	5,144,401
Policyholders’ account balances	10,083,258	7,689,929
Level 3
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Funds held under reinsurance agreements	$ 10,000,000
Level 3 \| Minimum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Policyholder Age	50 years
Level 3 \| Minimum \| Market risk benefit liabilities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Mortality rate	0.00%
Level 3 \| Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Policyholder Age	90 years
Level 3 \| Fair Value, Measurements, Recurring
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Market risk benefits assets	$ 2,550,164	2,367,243
Other assets	363,440	224,019
Receivables from parent and affiliates	181,319	0
Market risk benefit liabilities	4,370,960	5,144,401
Policyholders’ account balances	$ 10,083,258	$ 7,689,929
Level 3 \| Internal \| Minimum \| Discounted cash flow \| Market risk benefit liabilities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Lapse rate	1.00%	1.00%
Spread over SOFR	0.35%	0.41%
Utilization rate	37.00%	38.00%
Withdrawal rate (greater than maximum range)	78.00%	81.00%
Mortality rate	0.00%	0.00%
Equity volatility curve	15.00%	15.00%
Level 3 \| Internal \| Minimum \| Discounted cash flow \| Policyholders' account balances
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Lapse rate	0.00%	1.00%
Spread over SOFR	0.35%	0.41%
Mortality rate	0.00%	0.00%
Option budget	(1.00%)	(1.00%)
Level 3 \| Internal \| Minimum \| Discounted cash flow \| Corporate securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Discount rate	7.42%	6.98%
Level 3 \| Internal \| Minimum \| Discounted cash flow \| Commercial mortgage-backed securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liquidity premium	1.00%	0.60%
Level 3 \| Internal \| Minimum \| Discounted cash flow \| Market risk benefit assets
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Lapse rate	1.00%	1.00%
Spread over SOFR	0.35%	0.41%
Utilization rate	37.00%	38.00%
Withdrawal rate (greater than maximum range)	78.00%	81.00%
Mortality rate	0.00%	0.00%
Equity volatility curve	15.00%	15.00%
Level 3 \| Internal \| Minimum \| Discounted cash flow \| Other assets
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Lapse rate	0.00%	1.00%
Spread over SOFR	0.35%	0.41%
Mortality rate	0.00%	0.00%
Option budget	(1.00%)	(1.00%)
Level 3 \| Internal \| Minimum \| Liquidation \| Corporate securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liquidation value		63.62%
Level 3 \| Internal \| Maximum \| Discounted cash flow \| Market risk benefit liabilities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Lapse rate	20.00%	20.00%
Spread over SOFR	1.92%	1.91%
Utilization rate	94.00%	95.00%
Withdrawal rate (greater than maximum range)	100.00%	100.00%
Mortality rate	16.00%	15.00%
Equity volatility curve	25.00%	25.00%
Level 3 \| Internal \| Maximum \| Discounted cash flow \| Policyholders' account balances
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Lapse rate	80.00%	80.00%
Spread over SOFR	1.90%	1.85%
Mortality rate	23.00%	23.00%
Option budget	7.00%	7.00%
Level 3 \| Internal \| Maximum \| Discounted cash flow \| Corporate securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Discount rate	20.00%	20.00%
Level 3 \| Internal \| Maximum \| Discounted cash flow \| Commercial mortgage-backed securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liquidity premium	1.00%	0.75%
Level 3 \| Internal \| Maximum \| Discounted cash flow \| Market risk benefit assets
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Lapse rate	20.00%	20.00%
Spread over SOFR	1.92%	1.91%
Utilization rate	94.00%	95.00%
Withdrawal rate (greater than maximum range)	100.00%	100.00%
Mortality rate	16.00%	15.00%
Equity volatility curve	25.00%	25.00%
Level 3 \| Internal \| Maximum \| Discounted cash flow \| Other assets
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Lapse rate	80.00%	80.00%
Spread over SOFR	1.90%	1.85%
Mortality rate	23.00%	23.00%
Option budget	7.00%	7.00%
Level 3 \| Internal \| Maximum \| Liquidation \| Corporate securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liquidation value		63.62%
Level 3 \| Internal \| Weighted Average \| Discounted cash flow \| Corporate securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Discount rate	11.75%	9.73%
Level 3 \| Internal \| Weighted Average \| Discounted cash flow \| Commercial mortgage-backed securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liquidity premium	1.00%	0.71%
Level 3 \| Internal \| Weighted Average \| Liquidation \| Corporate securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liquidation value		63.62%
Level 3 \| Internal \| Fair Value, Measurements, Recurring \| Market risk benefit liabilities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Market risk benefit liabilities	$ 4,370,960	$ 5,144,401
Level 3 \| Internal \| Fair Value, Measurements, Recurring \| Policyholders' account balances
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Policyholders’ account balances	10,083,258	7,689,929
Level 3 \| Internal \| Fair Value, Measurements, Recurring \| Corporate securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Corporate securities	889,304	81,635
Level 3 \| Internal \| Fair Value, Measurements, Recurring \| Commercial mortgage-backed securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Commercial mortgage-backed securities	76,371	78,115
Level 3 \| Internal \| Fair Value, Measurements, Recurring \| Market risk benefit assets
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Market risk benefits assets	2,550,164	2,367,243
Level 3 \| Internal \| Fair Value, Measurements, Recurring \| Other assets
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other assets	363,440	$ 224,019
Level 3 \| Internal \| Fair Value, Measurements, Recurring \| Receivable from parent and affiliates
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Receivables from parent and affiliates	$ 181,319

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Liquidation value of asset or liability used as an input to a fair value calculation.

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Actuarially determined assumption around client mortality rates used as in input in calculating fair value of future policy benefits (primarily embedded derivatives associated with living benefit features on annuity contracts.

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Fair Value Inputs, Policyholder Age

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Actuarially determined assumption around utilization rates used as in input in calculating fair value of future policy benefits (primarily embedded derivatives associated with living benefit features on annuity contracts.

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Actuarially determined assumption around withdrawal rates used as in input in calculating fair value of future policy benefits (primarily embedded derivatives associated with living benefit features on annuity contracts.

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Quantitative Info Commercial Mortgage Backed Securities.

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Amount of the reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder.

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Amount of asset position for contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk.

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