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Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Unrealized gains (losses) for assets/liabilities still held:      
Market risk benefits assets $ 2,367,243 $ 1,393,237 [1]  
Market risk benefit liabilities 5,144,401 5,521,601 [1]  
Equity securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 28,593 12,472  
Purchases 2,531 10,000  
Sales 0 (230)  
Issuances 0 0  
Settlements 0 0  
Other (1,487) 9,661  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 28,709 28,593 $ 12,472
Total gains (losses) (realized/unrealized):      
Included in earnings (928) (3,310)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (928) (3,872)  
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 (928) (3,310) 709
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (928) (3,872) 709
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 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 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 1 0  
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 16,945 0  
Purchases 4,922 18,046  
Sales 0 0  
Issuances 0 0  
Settlements (21,322) (8,560)  
Other (1,359) 7,290  
Transfers into Level 3 0 55  
Transfers out of Level 3 0 0  
Fair Value, end of period 1,759 16,945 0
Total gains (losses) (realized/unrealized):      
Included in earnings 2,573 114  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 73  
Short-term investments | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 1,857 77 181
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 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  
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 (73) 73 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 73 0
Short-term investments | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 789 (36) 0
Cash equivalents | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings     147
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings     0
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 | 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
Other assets      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 141,041 72,937  
Purchases 145,922 49,677  
Sales 0 0  
Issuances 0 0  
Settlements (22,882) (3,855)  
Other 0 (21,814)  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 224,019 141,041 72,937
Total gains (losses) (realized/unrealized):      
Included in earnings (40,062) 44,096  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (62,944) 47,951  
Other assets | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings (40,062) 44,096 1,258
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (62,944) 47,951 359
Other 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
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 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Other assets | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Reinsurance recoverables      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 0    
Purchases 75,143    
Sales 0    
Issuances 0    
Settlements 0    
Other (2,364)    
Transfers into Level 3 0    
Transfers out of Level 3 0    
Fair Value, end of period 69,745 0  
Total gains (losses) (realized/unrealized):      
Included in earnings (3,034)    
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (3,034)    
Reinsurance recoverables | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings (3,034)    
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (3,034)    
Reinsurance recoverables | Other income (loss)      
Total gains (losses) (realized/unrealized):      
Included in earnings 0    
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0    
Reinsurance recoverables | 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    
Reinsurance recoverables | 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    
Reinsurance recoverables | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0    
Separate account assets      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 4,645 0  
Purchases 2,216 7,715  
Sales (1,124) (3,000)  
Issuances 0 0  
Settlements (160) 0  
Other 0 0  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 5,985 4,645 0
Total gains (losses) (realized/unrealized):      
Included in earnings 408 (70)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 406 (70)  
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 408 (70)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 406 (70)  
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 (3,502,096) (3,245,773)  
Purchases 0 0  
Sales 0 0  
Issuances (1,653,028) (1,094,824)  
Settlements 0 0  
Other 106,631 1,248,413  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period (7,689,929) (3,502,096) (3,245,773)
Total gains (losses) (realized/unrealized):      
Included in earnings (2,641,436) (409,912)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (360,807) (289,548)  
Policyholders' account balances | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings (2,641,436) (409,912) (78,321)
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (360,807) (289,548) 5,476
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  
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 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
Available-for-sale | Fixed maturities | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings (2,081) (16,829) (832)
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (2,904) (14,416) (1,778)
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  
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 (2,808) (56,470) (6,318)
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (2,420) (59,239) (5,346)
Available-for-sale | Fixed maturities | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 490 (242) 388
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 724 150  
Purchases 0 501  
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 682 724 150
Total gains (losses) (realized/unrealized):      
Included in earnings (42) 73  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (53) 69  
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 507,496 385,634  
Purchases 567,936 323,603  
Sales (39,722) (62,827)  
Issuances 0 0  
Settlements (130,688) (102,377)  
Other 3,129 106,408  
Transfers into Level 3 117,671 10,475  
Transfers out of Level 3 (11,564) (106,124)  
Fair Value, end of period 1,014,343 507,496 385,634
Total gains (losses) (realized/unrealized):      
Included in earnings 85 (47,296)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (973) (45,235)  
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 104,724 173,944  
Purchases 241,159 81,576  
Sales (37) 0  
Issuances 0 0  
Settlements (2,147) (1,993)  
Other (2,222) 0  
Transfers into Level 3 4,537 0  
Transfers out of Level 3 (164,335) (122,485)  
Fair Value, end of period 177,237 104,724 173,944
Total gains (losses) (realized/unrealized):      
Included in earnings (4,442) (26,318)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (4,298) (28,489)  
Trading | Fixed maturities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 0    
Purchases 36,284    
Sales 0    
Issuances 0    
Settlements 0    
Other 2,931    
Transfers into Level 3 0    
Transfers out of Level 3 (6,250)    
Fair Value, end of period 34,048 $ 0  
Total gains (losses) (realized/unrealized):      
Included in earnings 1,083    
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 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 1,080   46
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 1,225   46
Trading | Fixed maturities | 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    
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 $ 3   $ 0
[1] Prior period amounts reflect the implementation of Accounting Standard Update ("ASU") 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.