INVESTMENTS - Middle Market Loans by Key Credit Quality Indicators (Details) - Middle market loans $ in Millions	Dec. 31, 2021 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 1,210
2020	903
2019	909
2018	499
2017	326
Prior	182
Revolving Loans	668
Total Financing Receivable	4,697
BBB Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2021	136
2020	67
2019	43
2018	24
2017	0
Prior	0
Revolving Loans	72
Total Financing Receivable	342
BB Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2021	353
2020	332
2019	234
2018	134
2017	42
Prior	24
Revolving Loans	275
Total Financing Receivable	1,394
B Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2021	721
2020	482
2019	568
2018	267
2017	179
Prior	111
Revolving Loans	246
Total Financing Receivable	2,574
CCC Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	22
2019	64
2018	60
2017	79
Prior	47
Revolving Loans	74
Total Financing Receivable	346
CC Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	14
2017	26
Prior	0
Revolving Loans	1
Total Financing Receivable	41
C and Lower Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Revolving Loans	0
Total Financing Receivable	$ 0