INVESTMENTS - Middle Market Loans by Key Credit Quality Indicators (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total Financing Receivable	$ 13,641	$ 11,960
Middle market loans
Financing Receivable, Credit Quality Indicator [Line Items]
2022	571
2021	1,325
2020	829
2019	815
2018	426
Prior	322
Revolving Loans	824
Total Financing Receivable	5,112
Middle market loans | BBB Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2022	30
2021	153
2020	85
2019	37
2018	19
Prior	0
Revolving Loans	114
Total Financing Receivable	438
Middle market loans | BB Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2022	258
2021	456
2020	327
2019	210
2018	80
Prior	46
Revolving Loans	309
Total Financing Receivable	1,686
Middle market loans | B Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2022	283
2021	716
2020	396
2019	497
2018	243
Prior	220
Revolving Loans	350
Total Financing Receivable	2,705
Middle market loans | CCC Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0
2021	0
2020	21
2019	71
2018	70
Prior	56
Revolving Loans	50
Total Financing Receivable	268
Middle market loans | CC Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0
2021	0
2020	0
2019	0
2018	14
Prior	0
Revolving Loans	1
Total Financing Receivable	15
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