INVESTMENTS - Transitional Real Estate Loans by Key Credit Quality Indicators (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 13,133	$ 13,688
Transitional real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
2023	157
2022	2,390
2021	2,397
2020	273
2019	938
Prior	395
Total	6,550
Transitional real estate loans \| Loan to Value Ratio, 0.00% to 59.99%
Financing Receivable, Credit Quality Indicator [Line Items]
2023	114
2022	805
2021	554
2020	36
2019	124
Prior	10
Total	1,643
Transitional real estate loans \| Loan to Value Ratio, 60.00% to 69.99%
Financing Receivable, Credit Quality Indicator [Line Items]
2023	43
2022	561
2021	673
2020	52
2019	469
Prior	125
Total	1,923
Transitional real estate loans \| Loan to Value Ratio, 70.00% to 79.99%
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	809
2021	956
2020	139
2019	249
Prior	65
Total	2,218
Transitional real estate loans \| Loan-to-Value Ratio, 80.00% or greater
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	215
2021	214
2020	46
2019	96
Prior	195
Total	$ 766

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