INVESTMENTS - Middle Market Loans by Key Credit Quality Indicators (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 12,033	$ 12,801
Middle market loans
Financing Receivable, Credit Quality Indicator [Line Items]
2024	206
2023	101
2022	697
2021	1,165
2020	713
Prior	1,450
Revolving Loans	157
Total	4,489	$ 4,677
2024	0
2023	0
2022	0
2021	27
2020	0
Prior	23
Revolving Loans	0
Total	50
Middle market loans | BBB Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2024	10
2023	15
2022	62
2021	103
2020	94
Prior	93
Revolving Loans	16
Total	393
Middle market loans | BB Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2024	85
2023	41
2022	367
2021	415
2020	280
Prior	499
Revolving Loans	81
Total	1,768
Middle market loans | B Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2024	111
2023	45
2022	246
2021	563
2020	249
Prior	620
Revolving Loans	42
Total	1,876
Middle market loans | CCC Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0
2023	0
2022	22
2021	78
2020	90
Prior	140
Revolving Loans	16
Total	346
Middle market loans | CC Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	8
Revolving Loans	0
Total	8
Middle market loans | C and Lower Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0
2023	0
2022	0
2021	6
2020	0
Prior	90
Revolving Loans	2
Total	$ 98