INVESTMENTS - Middle Market 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
Middle market loans
Financing Receivable, Credit Quality Indicator [Line Items]
2022	354
2021	1,343
2020	888
2019	885
2018	448
Prior	393
Revolving Loans	776
Total Financing Receivable	5,087
Middle market loans | BBB Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2022	38
2021	184
2020	67
2019	37
2018	19
Prior	0
Revolving Loans	104
Total Financing Receivable	449
Middle market loans | BB Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2022	120
2021	437
2020	333
2019	240
2018	86
Prior	69
Revolving Loans	325
Total Financing Receivable	1,610
Middle market loans | B Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2022	196
2021	722
2020	467
2019	525
2018	259
Prior	225
Revolving Loans	291
Total Financing Receivable	2,685
Middle market loans | CCC Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0
2021	0
2020	21
2019	83
2018	70
Prior	91
Revolving Loans	55
Total Financing Receivable	320
Middle market loans | CC Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0
2021	0
2020	0
2019	0
2018	14
Prior	8
Revolving Loans	1
Total Financing Receivable	23
Middle market loans | C and Lower Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0
2021	0
2020	0
2019	0
2018	0
Prior	0
Revolving Loans	0
Total Financing Receivable	$ 0