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Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
[1]
Unrealized gains (losses) for assets/liabilities still held:          
Market risk benefits assets $ 2,519,234 $ 1,306,000 $ 2,519,234 $ 1,306,000 $ 1,393,237
Market risk benefit liabilities 4,371,178 5,945,000 4,371,178 5,945,000 $ 5,521,601
Equity securities          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 43,374 29,783 28,593 12,472  
Purchases 2,531 0 2,531 10,000  
Sales 0 0 0 (230)  
Issuances 0 0 0 0  
Settlements 0 0 0 0  
Other 0 0 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 44,686 28,672 44,686 28,672  
Total gains (losses) (realized/unrealized):          
Included in earnings (1,219) (1,111) (2,030) (3,231)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (1,219) (1,110) (2,030) (3,249)  
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 (1,219) (1,111) (2,030) (3,231)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (1,219) (1,110) (2,030) (3,249)  
Equity securities | Interest credited to policyholders’ account balances          
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 | 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 1,209 2,772 16,945 0  
Purchases 802 0 3,490 2,766  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements (1,427) (5,876) (21,065) (5,930)  
Other 0 7,290 (1,359) 7,290  
Transfers into Level 3 0 0 0 55  
Transfers out of Level 3 0 0 0 0  
Fair Value, end of period 584 4,188 584 4,188  
Total gains (losses) (realized/unrealized):          
Included in earnings 0 2 2,573 7  
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   0 1,857 0  
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 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   0 (73) 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings   0 51 0  
Short-term investments | Net investment income          
Total gains (losses) (realized/unrealized):          
Included in earnings   2 789 7  
Other assets          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 217,613 75,858 141,041 72,937  
Purchases 33,850 (24,914) 107,453 (23,673)  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements (6,512) (104) (11,563) (2,761)  
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 270,490 107,435 270,490 107,435  
Total gains (losses) (realized/unrealized):          
Included in earnings 25,539 56,595 33,559 60,932  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 19,028 56,700 21,997 63,692  
Other assets | Realized investment gains (losses), net          
Total gains (losses) (realized/unrealized):          
Included in earnings 25,539 56,595 33,559 60,932  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 19,028 56,700 21,997 63,692  
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 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 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 1,465   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 15,544   15,544    
Total gains (losses) (realized/unrealized):          
Included in earnings 14,079   15,544    
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 14,079   15,544    
Reinsurance Recoverables | Realized investment gains (losses), net          
Total gains (losses) (realized/unrealized):          
Included in earnings 14,079   15,544    
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 14,079   15,544    
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 4,982 0 4,645 0  
Purchases 1,049 7,000 1,889 7,000  
Sales (524) (3,000) (1,124) (3,000)  
Issuances 0 0 0 0  
Settlements 0 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 5,500 3,954 5,500 3,954  
Total gains (losses) (realized/unrealized):          
Included in earnings (7) (46) 250 (46)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (6) (46) 249 (46)  
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 (7) (46) 250 (46)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (6) (46) 249 (46)  
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 (5,513,449) (3,427,667) (3,502,096) (3,245,773)  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances (413,219) 0 (1,251,457) 0  
Settlements 0 (433,009) 0 (824,375)  
Other 28,467 0 102,835 239,022  
Transfers Into Level 3 0 0 0 0  
Transfers out of Level 3 0 0 0 0  
Fair Value, end of period (6,005,729) (3,642,839) (6,005,729) (3,642,839)  
Total gains (losses) (realized/unrealized):          
Included in earnings (107,528) 217,837 (1,355,011) 188,287  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (273,135) 843,341 (508,105) 1,272,540  
Policyholders' account balances | Realized investment gains (losses), net          
Total gains (losses) (realized/unrealized):          
Included in earnings (107,528) 217,837 (1,355,011) 188,287  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (273,135) 843,341 (508,105) 1,272,540  
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 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 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 (1,048) 307 (1,861) (16,505)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (674) 491 (2,693) (13,988)  
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 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Available-for-sale | Fixed maturities | Included in other comprehensive income (loss)          
Total gains (losses) (realized/unrealized):          
Included in earnings (31,183) (9,226) (26,743) (64,307)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (31,435) (9,811) (26,160) (64,768)  
Available-for-sale | Fixed maturities | Net investment income          
Total gains (losses) (realized/unrealized):          
Included in earnings 507 (1,272) 857 (942)  
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 701 135 724 150  
Purchases 0 501 0 501  
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 686 724 686 724  
Total gains (losses) (realized/unrealized):          
Included in earnings (15) 88 (38) 73  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (17) 86 (46) 71  
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 721,247 317,878 507,496 385,634  
Purchases 182,465 66,826 493,339 200,137  
Sales (10,882) (11,975) (39,721) (24,363)  
Issuances 0 0 0 0  
Settlements (27,762) (54,455) (104,604) (87,790)  
Other (708) 106,408 651 106,408  
Transfers into Level 3 117,152 6,259 117,152 6,259  
Transfers out of Level 3 (9,088) 0 (9,088) (106,124)  
Fair Value, end of period 944,586 423,565 944,586 423,565  
Total gains (losses) (realized/unrealized):          
Included in earnings (27,838) (7,376) (20,639) (56,596)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (28,256) (6,546) (21,842) (53,687)  
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 146,339 123,288 104,724 173,944  
Purchases 53,352 28,250 200,659 61,740  
Sales 0 0 (27) 0  
Issuances 0 0 0 0  
Settlements (339) (403) (1,677) (1,476)  
Other 0 0 0 0  
Transfers into Level 3 2,297 0 4,537 0  
Transfers out of Level 3 (7,600) (33,490) (110,968) (94,235)  
Fair Value, end of period 190,178 114,742 190,178 114,742  
Total gains (losses) (realized/unrealized):          
Included in earnings (3,871) (2,903) (7,070) (25,231)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (3,836) $ (2,860) (6,965) $ (25,140)  
Trading | Fixed maturities          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 0   0    
Purchases 0   6,250    
Sales 0   0    
Issuances 0   0    
Settlements 0   0    
Other 707   707    
Transfers into Level 3 0   0    
Transfers out of Level 3 0   (6,250)    
Fair Value, end of period 725   725    
Total gains (losses) (realized/unrealized):          
Included in earnings 18   18    
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 18   18    
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 18   18    
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 18   18    
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    
[1] Prior period amounts adjusted for the implementation of Accounting Standard Update ("ASU") 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.