INVESTMENTS - Middle Market Loans by Key Credit Quality Indicators (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 13,571	$ 13,688
Middle market loans
Financing Receivable, Credit Quality Indicator [Line Items]
2023	60
2022	634
2021	1,250
2020	787
2019	763
Prior	669
Revolving Loans	877
Total	5,040
Middle market loans | BBB Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2023	7
2022	58
2021	147
2020	68
2019	37
Prior	27
Revolving Loans	145
Total	489
Middle market loans | BB Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2023	31
2022	340
2021	458
2020	299
2019	170
Prior	126
Revolving Loans	392
Total	1,816
Middle market loans | B Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2023	22
2022	236
2021	624
2020	381
2019	445
Prior	344
Revolving Loans	287
Total	2,339
Middle market loans | CCC Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	21
2020	39
2019	104
Prior	156
Revolving Loans	50
Total	370
Middle market loans | CC Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	7
Prior	10
Revolving Loans	0
Total	17
Middle market loans | C and Lower Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	6
Revolving Loans	3
Total	$ 9