Fair Value of Assets and Liabilities (Quantitative Info for Level 3 Inputs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Corporate securities	$ 2,650,542	$ 824,270
Market risk benefit assets	2,637,363	2,367,243
Receivables from parent and affiliates	678,028	332,583
Market risk benefit liabilities	4,281,244	5,156,858	[1]
Fair Value, Measurements, Recurring
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Market risk benefit assets	2,637,363	2,367,243
Reinsurance recoverables and deposit receivables	645,193	192,642
Receivables from parent and affiliates	520,462	147,984
Market risk benefit liabilities	4,281,244	5,156,858
Policyholders’ account balances	12,624,585	7,697,627
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 benefit assets	$ 2,637,363	2,367,243
Reinsurance recoverables and deposit receivables	645,193	192,642
Receivables from parent and affiliates	351,390	0
Market risk benefit liabilities	4,281,244	5,156,858
Policyholders’ account balances	$ 12,624,585	$ 7,697,627
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	0.29%	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	16.00%	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	0.29%	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	2.15%	6.98%
Level 3 | Internal | Minimum   | Discounted cash flow | Asset-backed securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Discount rate	2.30%
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	0.29%	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	16.00%	15.00%
Level 3 | Internal | Minimum   | Discounted cash flow | Reinsurance recoverables and deposit receivables
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Lapse rate	0.00%	1.00%
Spread over SOFR	0.29%	0.41%
Option budget	(1.00%)	(1.00%)
Level 3 | Internal | Minimum   | Market comparables | Corporate securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
EBITDA multiples	5.0
Level 3 | Internal | Minimum   | Liquidation | Corporate securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liquidation value	75.00%	63.62%
Level 3 | Internal | Minimum   | Liquidation | Receivables from parent and affiliates
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liquidation value	100.00%
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	1.79%	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	1.73%	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 | Asset-backed securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Discount rate	10.70%
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	1.79%	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 | Reinsurance recoverables and deposit receivables
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Lapse rate	80.00%	80.00%
Spread over SOFR	1.71%	1.82%
Option budget	7.00%	7.00%
Level 3 | Internal | Maximum | Market comparables | Corporate securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
EBITDA multiples	5.0
Level 3 | Internal | Maximum | Liquidation | Corporate securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liquidation value	75.00%	63.62%
Level 3 | Internal | Maximum | Liquidation | Receivables from parent and affiliates
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liquidation value	100.00%
Level 3 | Internal | Weighted Average | Discounted cash flow | Corporate securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Discount rate	11.15%	9.73%
Level 3 | Internal | Weighted Average | Discounted cash flow | Asset-backed securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Discount rate	6.18%
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 | Market comparables | Corporate securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
EBITDA multiples	5.0
Level 3 | Internal | Weighted Average | Liquidation | Corporate securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liquidation value	75.00%	63.62%
Level 3 | Internal | Weighted Average | Liquidation | Receivables from parent and affiliates
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liquidation value	100.00%
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	$ 4,281,244	$ 5,156,858
Level 3 | Internal | Fair Value, Measurements, Recurring | Policyholders' account balances
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Policyholders’ account balances	12,624,585	7,697,627
Level 3 | Internal | Fair Value, Measurements, Recurring | Corporate securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Corporate securities	1,130,627	81,635
Level 3 | Internal | Fair Value, Measurements, Recurring | Asset-backed securities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Asset backed securities	90,370
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	75,318	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 benefit assets	2,637,363	2,367,243
Level 3 | Internal | Fair Value, Measurements, Recurring | Reinsurance recoverables and deposit receivables
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Reinsurance recoverables and deposit receivables	645,193	$ 192,642
Level 3 | Internal | Fair Value, Measurements, Recurring | Receivables from parent and affiliates
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Receivables from parent and affiliates	$ 328,001

[1] Amounts reflect revision to prior period Financial Statements. See Note 17 for additional information.