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Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Unrealized gains (losses) for assets/liabilities still held:      
Market risk benefits assets $ 2,536,843 $ 1,427,000 $ 2,367,243
Market risk benefit liabilities 4,388,317 5,622,000 $ 5,144,401
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 0  
Sales 0 0  
Issuances 0 0  
Settlements 0 0  
Other 0 15,411  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 28,650 43,174  
Total gains (losses) (realized/unrealized):      
Included in earnings (332) (830)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (332) (830)  
Equity securities | 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  
Equity securities | Other income (loss)      
Total gains (losses) (realized/unrealized):      
Included in earnings (332) (830)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (332) (830)  
Equity securities | 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  
Equity securities | 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  
Equity securities | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0  
Other invested assets      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 1    
Purchases (1)    
Sales 0    
Issuances 0    
Settlements 0    
Other 0    
Transfers into Level 3 0    
Transfers out of Level 3 0    
Fair Value, end of period 1    
Total gains (losses) (realized/unrealized):      
Included in earnings 1    
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 1    
Other invested assets | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 1    
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 1    
Other invested assets | 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 invested assets | 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    
Other invested assets | 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 invested assets | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 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 2,002 1,542  
Sales 0 0  
Issuances 0 0  
Settlements (94) (5,927)  
Other 0 0  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 3,351 14,416  
Total gains (losses) (realized/unrealized):      
Included in earnings (316) 1,856  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (316) 51  
Short-term investments | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings (316) 1,434  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (316) 0  
Short-term investments | 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  
Short-term investments | 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  
Short-term investments | Included in other comprehensive income (loss)      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 51  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 51  
Short-term investments | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 371  
Other assets      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 224,019 141,041  
Purchases 55,706 34,620  
Sales 0 0  
Issuances 0 0  
Settlements (13,194) (1,537)  
Other 0 0  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 303,538 155,763  
Total gains (losses) (realized/unrealized):      
Included in earnings 37,007 (18,361)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 23,814 (16,824)  
Other assets | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 37,007 (18,361)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 23,814 (16,824)  
Other 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 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 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 assets | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0  
Receivables from parents and affiliates      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 0    
Purchases 121,378    
Sales 0    
Issuances 0    
Settlements 0    
Other 0    
Transfers into Level 3 0    
Transfers out of Level 3 0    
Fair Value, end of period 121,378    
Total gains (losses) (realized/unrealized):      
Included in earnings 0    
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0    
Reinsurance Recoverables      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 69,745 0  
Purchases 34,302 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 98,083 1,357  
Total gains (losses) (realized/unrealized):      
Included in earnings (5,964) 1,357  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (35,533) 1,357  
Reinsurance Recoverables | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings (5,964) 1,357  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (35,533) 1,357  
Reinsurance Recoverables | 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  
Reinsurance Recoverables | 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  
Reinsurance Recoverables | 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  
Reinsurance Recoverables | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 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 2,633 0  
Sales (1,256) (180)  
Issuances 0 0  
Settlements (125) (10)  
Other 0 0  
Transfers into Level 3 458 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 7,894 4,553  
Total gains (losses) (realized/unrealized):      
Included in earnings 199 98  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 200 96  
Separate account assets | 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  
Separate account 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  
Separate account assets | Interest credited to policyholders’ account balances      
Total gains (losses) (realized/unrealized):      
Included in earnings 199 98  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 200 96  
Separate account 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  
Separate account assets | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0  
Policyholders' account balances      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period (7,689,929) (3,502,096)  
Purchases 0 0  
Sales 0 0  
Issuances (636,215) (398,623)  
Settlements 0 0  
Other 813 1,595  
Transfers Into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period (9,742,269) (4,129,043)  
Total gains (losses) (realized/unrealized):      
Included in earnings (1,416,938) (229,919)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (140,662) (417,482)  
Policyholders' account balances | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings (1,416,938) (229,919)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (140,662) (417,482)  
Policyholders' account balances | 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  
Policyholders' account balances | 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  
Policyholders' account balances | 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  
Policyholders' account balances | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 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 (207)    
Total gains (losses) (realized/unrealized):      
Included in earnings (207)    
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (207)    
Other liabilities | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings (207)    
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (207)    
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    
Unrealized gains (losses) for assets/liabilities still held:      
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 (1,696) 325  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 626 (901)  
Available-for-sale | Fixed maturities | 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  
Available-for-sale | 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  
Available-for-sale | Fixed maturities | Included in other comprehensive income (loss)      
Total gains (losses) (realized/unrealized):      
Included in earnings (9,842) 964  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (10,521) 1,916  
Available-for-sale | Fixed maturities | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 598 389  
Available-for-sale | Fixed maturities | Foreign government bonds      
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 671 714  
Total gains (losses) (realized/unrealized):      
Included in earnings (11) (10)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (13) (12)  
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 125,041 94,096  
Sales (65,052) (19,598)  
Issuances 0 0  
Settlements (53,892) (51,424)  
Other 0 0  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 1,009,650 535,893  
Total gains (losses) (realized/unrealized):      
Included in earnings (10,790) 5,323  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (9,602) 4,640  
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 484,340 146,016  
Sales 0 (27)  
Issuances 0 0  
Settlements (1,895) (613)  
Other 0 0  
Transfers into Level 3 34,578 2,240  
Transfers out of Level 3 0 (19,836)  
Fair Value, end of period 694,121 228,869  
Total gains (losses) (realized/unrealized):      
Included in earnings (139) (3,635)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (280) (3,613)  
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 113,343 6,250  
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 146,543 6,250  
Total gains (losses) (realized/unrealized):      
Included in earnings (848) 0  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (848) 0  
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 (848) 0  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (848) 0  
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 $ 0 $ 0