INVESTMENTS - Transitional Real Estate Loans by Key Credit Quality Indicators (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total Financing Receivable	$ 13,223	$ 11,960
Transitional real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1,547
2021	2,436
2020	299
2019	1,204
2018	723
Prior	51
Total Financing Receivable	6,260
Transitional real estate loans \| Loan to Value Ratio, 0.00% to 59.99%
Financing Receivable, Credit Quality Indicator [Line Items]
2022	452
2021	630
2020	36
2019	268
2018	86
Prior	0
Total Financing Receivable	1,472
Transitional real estate loans \| Loan to Value Ratio, 60.00% to 69.99%
Financing Receivable, Credit Quality Indicator [Line Items]
2022	423
2021	732
2020	138
2019	524
2018	430
Prior	50
Total Financing Receivable	2,297
Transitional real estate loans \| Loan to Value Ratio, 70.00% to 79.99%
Financing Receivable, Credit Quality Indicator [Line Items]
2022	672
2021	936
2020	125
2019	412
2018	207
Prior	1
Total Financing Receivable	2,353
Transitional real estate loans \| Loan-to-Value Ratio, 80.00% or greater
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0
2021	138
2020	0
2019	0
2018	0
Prior	0
Total Financing Receivable	$ 138

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