Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023		Dec. 31, 2022
Unrealized gains (losses) for assets/liabilities still held:
Market risk benefit assets	$ 2,637,363	$ 2,367,243
Market risk benefit liabilities	4,281,244	5,156,858	[1]
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	28,709	28,593
Purchases	273	2,531
Sales	(6,120)	0
Issuances	0	0
Settlements	(6,332)	0
Other	6,120	(1,487)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	20,515	28,709		$ 28,593
Total gains (losses) (realized/unrealized):
Included in earnings	(2,135)	(928)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(230)	(928)
Equity securities | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0		0
Equity securities | Other income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	(2,135)	(928)		(3,310)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(230)	(928)		(3,872)
Equity securities | Interest credited to policyholders' account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0		0
Equity securities | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0		0
Equity securities | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Other invested assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	1	0
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Other	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	143	1		0
Total gains (losses) (realized/unrealized):
Included in earnings	142	1
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	142	1
Other invested assets | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	142	1
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	142	1
Other invested assets | Other income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Other invested assets | Interest credited to policyholders' account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Other invested assets | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Other invested assets | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Short-term investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	1,759	16,945
Purchases	117,046	4,922
Sales	(13,113)	0
Issuances	0	0
Settlements	(1,488)	(21,322)
Other	(203)	(1,359)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	105,540	1,759		16,945
Total gains (losses) (realized/unrealized):
Included in earnings	1,539	2,573
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	321	0
Short-term investments | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	1,142	1,857		77
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(64)	0		0
Short-term investments | Other income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0		0
Short-term investments | Interest credited to policyholders' account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0		0
Short-term investments | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	385	(73)		73
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	385	0		73
Short-term investments | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	12	789		(36)
Cash equivalents
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	0
Purchases	744
Sales	0
Issuances	0
Settlements	(65)
Other	(605)
Transfers into Level 3	0
Transfers out of Level 3	0
Fair Value, end of period	33	0
Total gains (losses) (realized/unrealized):
Included in earnings	(41)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(41)
Cash equivalents | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	(41)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(41)
Cash equivalents | Other income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0
Cash equivalents | Interest credited to policyholders' account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0
Cash equivalents | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0
Cash equivalents | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0
Reinsurance recoverables and deposit receivables
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	192,642	115,886
Purchases	333,291	183,716
Sales	0	0
Issuances	0	0
Settlements	0	0
Other	93,231	(2,364)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	645,193	192,642		115,886
Total gains (losses) (realized/unrealized):
Included in earnings	26,029	(104,596)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(122,807)	(119,067)
Reinsurance recoverables and deposit receivables | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	26,029	(104,596)		111,382
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(122,807)	(119,067)		115,303
Reinsurance recoverables and deposit receivables | Other income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0		0
Reinsurance recoverables and deposit receivables | Interest credited to policyholders' account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0		0
Reinsurance recoverables and deposit receivables | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0		0
Reinsurance recoverables and deposit receivables | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Separate account assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	5,985	4,645
Purchases	5,823	2,216
Sales	(2,050)	(1,124)
Issuances	0	0
Settlements	(126)	(160)
Other	0	0
Transfers into Level 3	458	0
Transfers out of Level 3	0	0
Fair Value, end of period	10,547	5,985		4,645
Total gains (losses) (realized/unrealized):
Included in earnings	457	408
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	457	406
Separate account assets | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0		0
Separate account assets | Other income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0		0
Separate account assets | Interest credited to policyholders' account balances
Total gains (losses) (realized/unrealized):
Included in earnings	457	408		(70)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	457	406		(70)
Separate account assets | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0		0
Separate account assets | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Receivables from parent and affiliates
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	0
Purchases	418,916
Sales	(51,199)
Issuances	0
Settlements	0
Other	0
Transfers into Level 3	0
Transfers out of Level 3	(16,417)
Fair Value, end of period	351,390	0
Total gains (losses) (realized/unrealized):
Included in earnings	90
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	90
Receivables from parent and affiliates | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0
Receivables from parent and affiliates | Other income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0
Receivables from parent and affiliates | Interest credited to policyholders' account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0
Receivables from parent and affiliates | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	90
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	90
Receivables from parent and affiliates | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0
Policyholders' account balances
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	(7,697,627)	(3,502,096)
Purchases	0	0
Sales	0	0
Issuances	(2,286,786)	(1,653,026)
Settlements	0	0
Other	46,929	106,631
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	(12,624,585)	(7,697,627)		(3,502,096)
Total gains (losses) (realized/unrealized):
Included in earnings	(2,687,101)	(2,649,136)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	1,254,144	(368,507)
Policyholders' account balances | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	(2,687,101)	(2,649,136)		(409,912)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	1,254,144	(368,507)		(289,548)
Policyholders' account balances | Other income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0		0
Policyholders' account balances | Interest credited to policyholders' account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0		0
Policyholders' account balances | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0		0
Policyholders' account balances | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Other liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	0
Purchases	0
Sales	0
Issuances	0
Settlements	0
Other	0
Transfers into Level 3	0
Transfers out of Level 3	0
Fair Value, end of period	(31)	0
Total gains (losses) (realized/unrealized):
Included in earnings	(31)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(31)
Other liabilities | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	(31)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(31)
Other liabilities | Other income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0
Other liabilities | Interest credited to policyholders' account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0
Other liabilities | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0
Other liabilities | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	0
Available-for-sale | Fixed maturities | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	(54,924)	(2,081)		(16,829)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(40,765)	(2,904)		(14,416)
Available-for-sale | Fixed maturities | Other income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0		0
Available-for-sale | Fixed maturities | Interest credited to policyholders' account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0		0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0		0
Available-for-sale | Fixed maturities | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	(19,313)	(2,808)		(56,470)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(23,684)	(2,420)		(59,239)
Available-for-sale | Fixed maturities | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	(841)	490		(242)
Available-for-sale | Fixed maturities | Foreign government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	682	724
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Other	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, end of period	648	682		724
Total gains (losses) (realized/unrealized):
Included in earnings	(34)	(42)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(44)	(53)
Available-for-sale | Fixed maturities | Corporate securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	1,014,343	507,496
Purchases	1,172,201	567,936
Sales	(702,073)	(39,722)
Issuances	0	0
Settlements	(183,577)	(130,688)
Other	(64,672)	3,129
Transfers into Level 3	33,043	117,671
Transfers out of Level 3	0	(11,564)
Fair Value, end of period	1,199,607	1,014,343		507,496
Total gains (losses) (realized/unrealized):
Included in earnings	(69,658)	85
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(61,011)	(973)
Available-for-sale | Fixed maturities | Structured securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	177,237	104,724
Purchases	771,208	241,159
Sales	(40,508)	(37)
Issuances	0	0
Settlements	(96,067)	(2,147)
Other	65,480	(2,222)
Transfers into Level 3	34,578	4,537
Transfers out of Level 3	(206,650)	(164,335)
Fair Value, end of period	699,892	177,237		104,724
Total gains (losses) (realized/unrealized):
Included in earnings	(5,386)	(4,442)
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(3,394)	(4,298)
Trading | Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	34,048	0
Purchases	261,968	36,284
Sales	(52)	0
Issuances	0	0
Settlements	(2,261)	0
Other	0	2,931
Transfers into Level 3	18,842	0
Transfers out of Level 3	(236,606)	(6,250)
Fair Value, end of period	66,285	34,048		$ 0
Total gains (losses) (realized/unrealized):
Included in earnings	(9,654)	1,083
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(9,705)	1,225
Trading | Fixed maturities | Realized investment gains (losses), net
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Trading | Fixed maturities | Other income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	(9,661)	1,080
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	(9,705)	1,225
Trading | Fixed maturities | Interest credited to policyholders' account balances
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Trading | Fixed maturities | Included in other comprehensive income (loss)
Total gains (losses) (realized/unrealized):
Included in earnings	0	0
Unrealized gains (losses) for assets/liabilities still held:
Included in earnings	0	0
Trading | Fixed maturities | Net investment income
Total gains (losses) (realized/unrealized):
Included in earnings	$ 7	$ 3

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