INSURANCE LIABILITIES - Variable Annuity Contracts with GMDB and GMIB Features (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
GMDB
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 15,743
Separate Accounts	100,520	$ 94,488
Net Amount At Risk By Product And Guarantee, Account Value	116,263
NAR, gross	18,781
NAR, net of amounts reinsured	$ 18,300
Percentage of policyholders over age 70	20.20%
GMDB | Return of Premium
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 15,434
Separate Accounts	53,877
Net Amount At Risk By Product And Guarantee, Account Value	69,311
NAR, gross	97
NAR, net of amounts reinsured	$ 97
Percentage of policyholders over age 70	11.20%
GMDB | Ratchet
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 88
Separate Accounts	9,550
Net Amount At Risk By Product And Guarantee, Account Value	9,638
NAR, gross	33
NAR, net of amounts reinsured	$ 31
Percentage of policyholders over age 70	48.40%
GMDB | Roll-Up
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 54
Separate Accounts	3,299
Net Amount At Risk By Product And Guarantee, Account Value	3,353
NAR, gross	1,604
NAR, net of amounts reinsured	$ 1,125
Percentage of policyholders over age 70	70.30%
GMDB | Combo
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 167
Separate Accounts	33,794
Net Amount At Risk By Product And Guarantee, Account Value	33,961
NAR, gross	17,047
NAR, net of amounts reinsured	$ 17,047
Percentage of policyholders over age 70	54.20%
GMIB
Net Amount at Risk by Product and Guarantee [Line Items]
Separate Accounts	$ 61,186	$ 59,348
Immediate Variable Annuity | GMDB
Net Amount at Risk by Product and Guarantee [Line Items]
Average attained age of policyholders (in years)	55 years 3 months 18 days
Immediate Variable Annuity | GMDB | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	3.00%
Immediate Variable Annuity | GMDB | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	6.50%
Immediate Variable Annuity | GMDB | Return of Premium
Net Amount at Risk by Product and Guarantee [Line Items]
Average attained age of policyholders (in years)	51 years 3 months 18 days
Immediate Variable Annuity | GMDB | Ratchet
Net Amount at Risk by Product and Guarantee [Line Items]
Average attained age of policyholders (in years)	68 years 3 months 18 days
Immediate Variable Annuity | GMDB | Roll-Up
Net Amount at Risk by Product and Guarantee [Line Items]
Average attained age of policyholders (in years)	74 years 10 months 24 days
Immediate Variable Annuity | GMDB | Roll-Up | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	3.00%
Immediate Variable Annuity | GMDB | Roll-Up | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	6.00%
Immediate Variable Annuity | GMDB | Combo
Net Amount at Risk by Product and Guarantee [Line Items]
Average attained age of policyholders (in years)	70 years 2 months 12 days
Immediate Variable Annuity | GMDB | Combo | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	3.00%
Immediate Variable Annuity | GMDB | Combo | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	6.50%
Immediate Variable Annuity | GMIB
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 233
Separate Accounts	61,186
Net Amount At Risk By Product And Guarantee, Account Value	61,419
NAR, gross	12,096
NAR, net of amounts reinsured	$ 10,470
Average attained age of policyholders (in years)	68 years
Weighted average years remaining until annuitization (in years)	2 years 6 months
Immediate Variable Annuity | GMIB | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	3.00%
Immediate Variable Annuity | GMIB | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	6.50%
Immediate Variable Annuity | GMIB | Return of Premium
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 0
Separate Accounts	0
Net Amount At Risk By Product And Guarantee, Account Value	0
NAR, gross	0
NAR, net of amounts reinsured	0
Immediate Variable Annuity | GMIB | Ratchet
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	0
Separate Accounts	0
Net Amount At Risk By Product And Guarantee, Account Value	0
NAR, gross	0
NAR, net of amounts reinsured	0
Immediate Variable Annuity | GMIB | Roll-Up
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	16
Separate Accounts	24,956
Net Amount At Risk By Product And Guarantee, Account Value	24,972
NAR, gross	877
NAR, net of amounts reinsured	$ 281
Average attained age of policyholders (in years)	64 years 2 months 12 days
Weighted average years remaining until annuitization (in years)	5 years 7 months 6 days
Immediate Variable Annuity | GMIB | Roll-Up | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	3.00%
Immediate Variable Annuity | GMIB | Roll-Up | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	6.00%
Immediate Variable Annuity | GMIB | Combo
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 217
Separate Accounts	36,230
Net Amount At Risk By Product And Guarantee, Account Value	36,447
NAR, gross	11,219
NAR, net of amounts reinsured	$ 10,189
Average attained age of policyholders (in years)	70 years 2 months 12 days
Weighted average years remaining until annuitization (in years)	5 years 7 months 6 days
Immediate Variable Annuity | GMIB | Combo | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	3.00%
Immediate Variable Annuity | GMIB | Combo | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	6.50%