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Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
[1]
Unrealized gains (losses) for assets/liabilities still held:          
Market risk benefits assets $ 2,340,230 $ 1,423,000 $ 2,340,230 $ 1,423,000 $ 1,393,237
Market risk benefit liabilities 5,089,766 6,686,000 5,089,766 6,686,000 $ 5,521,601
Equity securities          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 43,174 11,463 28,593 12,472  
Purchases 0 10,000 0 10,000  
Sales 0 (230) 0 (230)  
Issuances 0 0 0 0  
Settlements 0 0 0 0  
Other 181 9,661 15,592 9,661  
Transfers into Level 3 0 0 0 0  
Transfers out of Level 3 0 0 0 0  
Fair Value, end of period 43,374 29,783 43,374 29,783  
Total gains (losses) (realized/unrealized):          
Included in earnings 19 (1,111) (811) (2,120)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 19 (1,129) (811) (2,138)  
Equity securities | Realized investment gains (losses), net          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Equity securities | Other income (loss)          
Total gains (losses) (realized/unrealized):          
Included in earnings 19 (1,111) (811) (2,120)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 19 (1,129) (811) (2,138)  
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 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Equity securities | Net investment income          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Short-term investments          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 14,416 0 16,945 0  
Purchases 1,146 2,766 2,688 2,766  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements (13,711) (54) (19,638) (54)  
Other (1,359) 0 (1,359) 0  
Transfers into Level 3 0 55 0 55  
Transfers out of Level 3 0 0 0 0  
Fair Value, end of period 1,209 2,772 1,209 2,772  
Total gains (losses) (realized/unrealized):          
Included in earnings 717 5 2,573 5  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 51 0  
Short-term investments | Realized investment gains (losses), net          
Total gains (losses) (realized/unrealized):          
Included in earnings 423 0 1,857 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Short-term investments | Other income (loss)          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 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 (124) 0 (73) 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 51 0  
Short-term investments | Net investment income          
Total gains (losses) (realized/unrealized):          
Included in earnings 418 5 789 5  
Other assets          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 155,763 75,201 141,041 72,937  
Purchases 38,983 (6,574) 73,603 1,241  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements (3,514) (819) (5,051) (2,657)  
Other 0 0 0 0  
Transfers into Level 3 0 0 0 0  
Transfers out of Level 3 0 0 0 0  
Fair Value, end of period 217,613 75,858 217,613 75,858  
Total gains (losses) (realized/unrealized):          
Included in earnings 26,381 8,050 8,020 4,337  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 19,779 7,231 2,969 1,679  
Other assets | Realized investment gains (losses), net          
Total gains (losses) (realized/unrealized):          
Included in earnings 26,381 8,050 8,020 4,337  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 19,779 7,231 2,969 1,679  
Other assets | Other income (loss)          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 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 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Other assets | Net investment income          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Reinsurance Recoverables          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 1,357 0 0 0  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements 0 0 0 0  
Other 0 0 0 0  
Transfers into Level 3 0 0 0 0  
Transfers out of Level 3 0 0 0 0  
Fair Value, end of period 1,465 0 1,465 0  
Total gains (losses) (realized/unrealized):          
Included in earnings 108 0 1,465 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 108 0 1,465 0  
Reinsurance Recoverables | Realized investment gains (losses), net          
Total gains (losses) (realized/unrealized):          
Included in earnings 108 0 1,465 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 108 0 1,465 0  
Reinsurance Recoverables | Other income (loss)          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 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 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Reinsurance Recoverables | Net investment income          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Separate account assets          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 4,553 0 4,645 0  
Purchases 840 0 840 0  
Sales (420) 0 (600) 0  
Issuances 0 0 0 0  
Settlements (150) 0 (160) 0  
Other 0 0 0 0  
Transfers into Level 3 0 0 0 0  
Transfers out of Level 3 0 0 0 0  
Fair Value, end of period 4,982 0 4,982 0  
Total gains (losses) (realized/unrealized):          
Included in earnings 159 0 257 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 159 0 255 0  
Separate account assets | Realized investment gains (losses), net          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Separate account assets | Other income (loss)          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Separate account assets | Interest credited to policyholders’ account balances          
Total gains (losses) (realized/unrealized):          
Included in earnings 159   257    
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 159   255    
Separate account assets | Included in other comprehensive income (loss)          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Separate account assets | Net investment income          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Policyholders' account balances          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period (4,129,043) (3,260,195) (3,502,096) (3,245,773)  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances (439,615) 0 (838,238) 0  
Settlements 0 (238,575) 0 (391,366)  
Other 72,773 0 74,368 239,022  
Transfers Into Level 3 0 0 0 0  
Transfers out of Level 3 0 0 0 0  
Fair Value, end of period (5,513,449) (3,427,667) (5,513,449) (3,427,667)  
Total gains (losses) (realized/unrealized):          
Included in earnings (1,017,564) 71,103 (1,247,483) (29,550)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (150,676) (341,035) (234,970) (492,251)  
Policyholders' account balances | Realized investment gains (losses), net          
Total gains (losses) (realized/unrealized):          
Included in earnings (1,017,564) 71,103 (1,247,483) (29,550)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (150,676) (341,035) (234,970) (492,251)  
Policyholders' account balances | Other income (loss)          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 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 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Policyholders' account balances | Net investment income          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Available-for-sale | Fixed maturities | Realized investment gains (losses), net          
Total gains (losses) (realized/unrealized):          
Included in earnings (1,138) (1,909) (813) (16,812)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (1,118) 631 (2,019) (14,380)  
Available-for-sale | Fixed maturities | Other income (loss)          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 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 3,476 (21,240) 4,440 (55,081)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 3,359 (21,518) 5,275 (54,957)  
Available-for-sale | Fixed maturities | Net investment income          
Total gains (losses) (realized/unrealized):          
Included in earnings (39) (53) 350 330  
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 714 140 724 150  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements 0 0 0 0  
Other 0 0 0 0  
Transfers into Level 3 0 0 0 0  
Transfers out of Level 3 0 0 0 0  
Fair Value, end of period 701 135 701 135  
Total gains (losses) (realized/unrealized):          
Included in earnings (13) (5) (23) (15)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (16) (5) (28) (15)  
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 535,893 385,358 507,496 385,634  
Purchases 216,778 83,901 310,874 133,311  
Sales (9,241) (11,217) (28,839) (12,388)  
Issuances 0 0 0 0  
Settlements (25,418) (21,195) (76,842) (33,335)  
Other 1,359 0 1,359 0  
Transfers into Level 3 0 0 0 0  
Transfers out of Level 3 0 (106,124) 0 (106,124)  
Fair Value, end of period 721,247 317,878 721,247 317,878  
Total gains (losses) (realized/unrealized):          
Included in earnings 1,876 (12,845) 7,199 (49,220)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 1,773 (10,577) 6,413 (47,042)  
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 228,869 112,116 104,724 173,944  
Purchases 1,291 33,490 147,307 33,490  
Sales 0 0 (27) 0  
Issuances 0 0 0 0  
Settlements (725) (571) (1,338) (1,073)  
Other 0 0 0 0  
Transfers into Level 3 0 0 2,240 0  
Transfers out of Level 3 (83,532) (11,395) (103,368) (60,745)  
Fair Value, end of period 146,339 123,288 146,339 123,288  
Total gains (losses) (realized/unrealized):          
Included in earnings 436 (10,352) (3,199) (22,328)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 484 (10,305) (3,129) (22,280)  
Trading | Fixed maturities          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 6,250 0 0 0  
Purchases 0 0 6,250 0  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements 0 0 0 0  
Other 0 0 0 0  
Transfers into Level 3 0 0 0 0  
Transfers out of Level 3 (6,250) 0 (6,250) 0  
Fair Value, end of period 0 0 0 0  
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Trading | Fixed maturities | Realized investment gains (losses), net          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Trading | Fixed maturities | Other income (loss)          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 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 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Trading | Fixed maturities | Net investment income          
Total gains (losses) (realized/unrealized):          
Included in earnings $ 0 $ 0 $ 0 $ 0  
[1] Prior period amounts adjusted for the implementation of Accounting Standard Update ("ASU") 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.