REVENUES FROM EXTERNAL CUSTOMERS - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total Revenues	$ 7,791	$ 5,174	$ 6,918
Individual Variable Annuity Products
Disaggregation of Revenue [Line Items]
Total Revenues	2,728	2,810	2,821
Individual Variable Annuity Products | Premiums
Disaggregation of Revenue [Line Items]
Total Revenues	165	179	171
Individual Variable Annuity Products | Fees
Disaggregation of Revenue [Line Items]
Total Revenues	2,555	2,615	2,631
Amortization/capitalization of unearned revenue liability	(14)	(35)	(19)
Individual Variable Annuity Products | Others
Disaggregation of Revenue [Line Items]
Total Revenues	8	16	19
Employer- Sponsored
Disaggregation of Revenue [Line Items]
Total Revenues	504	481	464
Employer- Sponsored | Premiums
Disaggregation of Revenue [Line Items]
Total Revenues	0	0	0
Employer- Sponsored | Fees
Disaggregation of Revenue [Line Items]
Total Revenues	500	477	459
Employer- Sponsored | Others
Disaggregation of Revenue [Line Items]
Total Revenues	4	4	5
Life Insurance Products
Disaggregation of Revenue [Line Items]
Total Revenues	2,031	2,163	2,147
Life Insurance Products | Premiums
Disaggregation of Revenue [Line Items]
Total Revenues	587	702	657
Life Insurance Products | Fees
Disaggregation of Revenue [Line Items]
Total Revenues	1,421	1,440	1,458
Life Insurance Products | Others
Disaggregation of Revenue [Line Items]
Total Revenues	23	21	32
Employee Benefit Products
Disaggregation of Revenue [Line Items]
Total Revenues	51	48	18
Employee Benefit Products | Premiums
Disaggregation of Revenue [Line Items]
Total Revenues	36	35	12
Employee Benefit Products | Fees
Disaggregation of Revenue [Line Items]
Total Revenues	0	0	0
Employee Benefit Products | Others
Disaggregation of Revenue [Line Items]
Total Revenues	15	13	6
Other
Disaggregation of Revenue [Line Items]
Total Revenues	38	34	39
Other | Premiums
Disaggregation of Revenue [Line Items]
Total Revenues	18	20	22
Other | Fees
Disaggregation of Revenue [Line Items]
Total Revenues	13	12	15
Other | Others
Disaggregation of Revenue [Line Items]
Total Revenues	$ 7	$ 2	$ 2