INVESTMENTS - Commercial Mortgage Loans by Key Credit Quality Indicator (Details) - Commercial mortgage loans $ in Millions	Dec. 31, 2021 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 340
2020	47
2019	608
2018	167
2017	68
Prior	674
Total Financing Receivable	$ 1,904
Weighted average debt-service coverage ratio	2.45
2021
Financing Receivable, Credit Quality Indicator [Line Items]
Weighted average debt-service coverage ratio	2.83
2020
Financing Receivable, Credit Quality Indicator [Line Items]
Weighted average debt-service coverage ratio	1.93
2019
Financing Receivable, Credit Quality Indicator [Line Items]
Weighted average debt-service coverage ratio	2.46
2018
Financing Receivable, Credit Quality Indicator [Line Items]
Weighted average debt-service coverage ratio	2.29
2017
Financing Receivable, Credit Quality Indicator [Line Items]
Weighted average debt-service coverage ratio	2.75
Prior
Financing Receivable, Credit Quality Indicator [Line Items]
Weighted average debt-service coverage ratio	2.30
Loan to Value Ratio, Zero to Fifty-nine Point Nine-nine Percent
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 306
2020	47
2019	522
2018	167
2017	68
Prior	535
Total Financing Receivable	$ 1,645
Weighted average debt-service coverage ratio	2.53
Loan to Value Ratio, Sixty to Sixty-nine Point Nine-nine Percent
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 34
2020	0
2019	86
2018	0
2017	0
Prior	114
Total Financing Receivable	$ 234
Weighted average debt-service coverage ratio	1.92
Loan to Value Ratio, Seventy to Seventy-nine Point Nine-nine Percent
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 0
2020	0
2019	0
2018	0
2017	0
Prior	25
Total Financing Receivable	$ 25
Weighted average debt-service coverage ratio	1.65
Loan to Value Ratio Eighty Percent and Above
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 0
2020	0
2019	0
2018	0
2017	0
Prior	0
Total Financing Receivable	$ 0
Weighted average debt-service coverage ratio	0.00