Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Assets:
Policy loans	$ 1,541,480	$ 1,472,677
Short-term investments	517,386
Cash and cash equivalents	3,325,698	2,139,792
Accrued investment income	466,394	333,838
Receivables from parent and affiliates	678,028	332,583
Liabilities:
Cash collateral for loaned securities	121,372	218,310
Reinsurance Payable And Funds Withheld Payable	8,611,141	2,738,979	[1],[2]
Fair Value
Assets:
Commercial mortgage and other loans	7,534,909	5,918,386
Policy loans	1,541,480	1,472,677
Short-term investments	21,101	66,500
Cash and cash equivalents	474,415	495,667
Accrued investment income	466,394	333,838
Reinsurance recoverables and deposit receivables	2,355,489	1,512,138
Receivables from parent and affiliates	157,566	184,599
Other assets	203,493	80,646
Total assets	12,754,847	10,064,451
Liabilities:
Policyholders’ account balances - investment contracts	10,811,361	6,352,532
Cash collateral for loaned securities	121,372	218,310
Reinsurance Payable And Funds Withheld Payable	2,602,140	1,517,131
Short-term debt to affiliates		176,110
Payables to parent and affiliates	38,571	16,573
Other liabilities	880,884	637,153
Total liabilities	14,454,328	8,917,809
Carrying Amount
Assets:
Commercial mortgage and other loans	7,759,323	6,122,721
Policy loans	1,541,480	1,472,677
Short-term investments	21,101	66,500
Cash and cash equivalents	474,415	495,667
Accrued investment income	466,394	333,838
Reinsurance recoverables and deposit receivables	2,357,292	1,513,520
Receivables from parent and affiliates	157,566	184,599
Other assets	203,493	80,646
Total assets	12,981,064	10,270,168
Liabilities:
Policyholders’ account balances - investment contracts	10,826,931	6,368,061
Cash collateral for loaned securities	121,372	218,310
Reinsurance Payable And Funds Withheld Payable	2,602,140	1,517,131
Short-term debt to affiliates		180,411
Payables to parent and affiliates	38,571	16,573
Other liabilities	880,884	637,153
Total liabilities	14,469,898	8,937,639
Level 1 | Fair Value
Assets:
Commercial mortgage and other loans	0	0
Policy loans	0	0
Short-term investments	21,101	66,500
Cash and cash equivalents	474,415	470,668
Accrued investment income	0	0
Reinsurance recoverables and deposit receivables	0	0
Receivables from parent and affiliates	0	0
Other assets	0	0
Total assets	495,516	537,168
Liabilities:
Policyholders’ account balances - investment contracts	0	0
Cash collateral for loaned securities	0	0
Reinsurance Payable And Funds Withheld Payable	0	0
Short-term debt to affiliates		0
Payables to parent and affiliates	0	0
Other liabilities	0	0
Total liabilities	0	0
Level 2 | Fair Value
Assets:
Commercial mortgage and other loans	0	0
Policy loans	0	0
Short-term investments	0	0
Cash and cash equivalents	0	24,999
Accrued investment income	466,394	333,838
Reinsurance recoverables and deposit receivables	0	0
Receivables from parent and affiliates	157,566	184,599
Other assets	203,493	80,646
Total assets	827,453	624,082
Liabilities:
Policyholders’ account balances - investment contracts	815,520	955,647
Cash collateral for loaned securities	121,372	218,310
Reinsurance Payable And Funds Withheld Payable	2,602,140	1,517,131
Short-term debt to affiliates		176,110
Payables to parent and affiliates	38,571	16,573
Other liabilities	849,278	604,730
Total liabilities	4,426,881	3,488,501
Level 3 | Fair Value
Assets:
Commercial mortgage and other loans	7,534,909	5,918,386
Policy loans	1,541,480	1,472,677
Short-term investments	0	0
Cash and cash equivalents	0	0
Accrued investment income	0	0
Reinsurance recoverables and deposit receivables	2,355,489	1,512,138
Receivables from parent and affiliates	0	0
Other assets	0	0
Total assets	11,431,878	8,903,201
Liabilities:
Policyholders’ account balances - investment contracts	9,995,841	5,396,885
Cash collateral for loaned securities	0	0
Reinsurance Payable And Funds Withheld Payable	0	0
Short-term debt to affiliates		0
Payables to parent and affiliates	0	0
Other liabilities	31,606	32,423
Total liabilities	$ 10,027,447	$ 5,429,308

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

[2] Prior period amounts have been reclassified to conform to current period presentation.