INVESTMENTS - Transitional Real Estate Loans by Key Credit Quality Indicators (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Loan-to-Value Ratio:
Total	$ 10,559	$ 11,224
Transitional real estate loans
Loan-to-Value Ratio:
2025	0
2024	0
2023	91
2022	1,734
2021	1,727
Prior	765
Total	4,317	$ 4,902
Current-period gross writeoffs:
2025	0
2024	0
2023	0
2022	5
2021	0
Prior	24
Total	29
Transitional real estate loans | Loan to Value Ratio, 0.00% to 59.99%
Loan-to-Value Ratio:
2025	0
2024	0
2023	0
2022	371
2021	391
Prior	10
Total	772
Transitional real estate loans | Loan to Value Ratio, 60.00% to 69.99%
Loan-to-Value Ratio:
2025	0
2024	0
2023	77
2022	400
2021	418
Prior	402
Total	1,297
Transitional real estate loans | Loan to Value Ratio, 70.00% to 79.99%
Loan-to-Value Ratio:
2025	0
2024	0
2023	14
2022	776
2021	621
Prior	43
Total	1,454
Transitional real estate loans | Loan-to-Value Ratio, 80.00% or greater
Loan-to-Value Ratio:
2025	0
2024	0
2023	0
2022	187
2021	297
Prior	310
Total	$ 794