INVESTMENTS - Transitional Real Estate Loans by Key Credit Quality Indicators (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 11,828	$ 12,801
Transitional real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0
2023	129
2022	2,047
2021	2,108
2020	216
Prior	900
Total	5,400	$ 6,114
2024	0
2023	0
2022	0
2021	5
2020	0
Prior	49
Total	54
Transitional real estate loans | Loan to Value Ratio, 0.00% to 59.99%
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0
2023	0
2022	617
2021	587
2020	36
Prior	19
Total	1,259
Transitional real estate loans | Loan to Value Ratio, 60.00% to 69.99%
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0
2023	115
2022	396
2021	573
2020	18
Prior	559
Total	1,661
Transitional real estate loans | Loan to Value Ratio, 70.00% to 79.99%
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0
2023	14
2022	814
2021	712
2020	82
Prior	55
Total	1,677
Transitional real estate loans | Loan-to-Value Ratio, 80.00% or greater
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0
2023	0
2022	220
2021	236
2020	80
Prior	267
Total	$ 803