INSURANCE LIABILITIES - Variable Annuity Contracts with GMDB and GMIB Features and Buybacks (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
GMDB
Net Amount at Risk by Product and Guarantee [Line Items]
Separate Accounts	$ 91,323	$ 94,489
GMDB | Direct Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	15,472
Separate Accounts	91,323
Total Account Values	106,795
Net Amount at Risk, gross	21,644
Net Amount at Risk, net of amounts reinsured	$ 21,096
Average attained age of contract holders (in years)	55 years 3 months 18 days
Percentage of policyholders over age 70	20.00%
GMDB | Direct Variable Annuity | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	3.00%
GMDB | Direct Variable Annuity | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	6.50%
GMDB | Deferred Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 7,129
Net Amount at Risk, gross	$ 402
Average attained age of contract holders (in years)	73 years
Percentage of policyholders over age 70	65.20%
GMDB | Deferred Variable Annuity | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	3.00%
GMDB | Deferred Variable Annuity | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	10.00%
GMIB
Net Amount at Risk by Product and Guarantee [Line Items]
Separate Accounts	$ 56,341	$ 59,348
GMIB | Direct Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	237
Separate Accounts	56,341
Total Account Values	56,578
Net Amount at Risk, gross	15,561
Net Amount at Risk, net of amounts reinsured	$ 13,415
Average attained age of contract holders (in years)	67 years 9 months 18 days
Weighted average years remaining until annuitization (in years)	2 years 6 months
GMIB | Direct Variable Annuity | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	3.00%
GMIB | Direct Variable Annuity | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	6.50%
GMIB | Deferred Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 2,227
Net Amount at Risk, gross	$ 324
Average attained age of contract holders (in years)	71 years
Percentage of policyholders over age 70	59.50%
GMIB | Deferred Variable Annuity | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	3.30%
GMIB | Deferred Variable Annuity | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	6.50%
Return of Premium | GMDB | Direct Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 15,155
Separate Accounts	48,407
Total Account Values	63,562
Net Amount at Risk, gross	125
Net Amount at Risk, net of amounts reinsured	$ 125
Average attained age of contract holders (in years)	51 years 3 months 18 days
Percentage of policyholders over age 70	11.00%
Return of Premium | GMDB | Deferred Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 888
Net Amount at Risk, gross	$ 5
Average attained age of contract holders (in years)	68 years
Percentage of policyholders over age 70	45.90%
Return of Premium | GMIB | Direct Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 0
Separate Accounts	0
Total Account Values	0
Net Amount at Risk, gross	0
Net Amount at Risk, net of amounts reinsured	0
Return of Premium | GMIB | Deferred Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	878
Net Amount at Risk, gross	$ 1
Average attained age of contract holders (in years)	72 years
Percentage of policyholders over age 70	65.00%
Ratchet | GMDB | Direct Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 89
Separate Accounts	8,812
Total Account Values	8,901
Net Amount at Risk, gross	94
Net Amount at Risk, net of amounts reinsured	$ 91
Average attained age of contract holders (in years)	68 years 1 month 6 days
Percentage of policyholders over age 70	47.70%
Ratchet | GMDB | Deferred Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 4,915
Net Amount at Risk, gross	$ 241
Average attained age of contract holders (in years)	73 years
Percentage of policyholders over age 70	65.60%
Ratchet | GMIB | Direct Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 0
Separate Accounts	0
Total Account Values	0
Net Amount at Risk, gross	0
Net Amount at Risk, net of amounts reinsured	0
Ratchet | GMIB | Deferred Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	42
Net Amount at Risk, gross	$ 0
Average attained age of contract holders (in years)	74 years
Percentage of policyholders over age 70	62.20%
Roll-Up | GMDB | Direct Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 57
Separate Accounts	3,021
Total Account Values	3,078
Net Amount at Risk, gross	1,864
Net Amount at Risk, net of amounts reinsured	$ 1,319
Average attained age of contract holders (in years)	74 years 8 months 12 days
Percentage of policyholders over age 70	69.80%
Roll-Up | GMDB | Direct Variable Annuity | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	3.00%
Roll-Up | GMDB | Direct Variable Annuity | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	6.00%
Roll-Up | GMDB | Deferred Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 247
Net Amount at Risk, gross	$ 14
Average attained age of contract holders (in years)	78 years
Percentage of policyholders over age 70	79.90%
Roll-Up | GMDB | Deferred Variable Annuity | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	3.00%
Roll-Up | GMDB | Deferred Variable Annuity | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	10.00%
Roll-Up | GMIB | Direct Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 17
Separate Accounts	23,124
Total Account Values	23,141
Net Amount at Risk, gross	1,100
Net Amount at Risk, net of amounts reinsured	$ 349
Average attained age of contract holders (in years)	64 years
Weighted average years remaining until annuitization (in years)	5 years 8 months 12 days
Roll-Up | GMIB | Direct Variable Annuity | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	3.00%
Roll-Up | GMIB | Direct Variable Annuity | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	6.00%
Roll-Up | GMIB | Deferred Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 217
Net Amount at Risk, gross	$ 27
Average attained age of contract holders (in years)	72 years
Percentage of policyholders over age 70	61.90%
Roll-Up | GMIB | Deferred Variable Annuity | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	3.30%
Roll-Up | GMIB | Deferred Variable Annuity | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	6.50%
Combo | GMDB | Direct Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 171
Separate Accounts	31,083
Total Account Values	31,254
Net Amount at Risk, gross	19,561
Net Amount at Risk, net of amounts reinsured	$ 19,561
Average attained age of contract holders (in years)	70 years
Percentage of policyholders over age 70	53.30%
Combo | GMDB | Direct Variable Annuity | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	3.00%
Combo | GMDB | Direct Variable Annuity | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	6.50%
Combo | GMDB | Deferred Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 1,079
Net Amount at Risk, gross	$ 142
Average attained age of contract holders (in years)	76 years
Percentage of policyholders over age 70	76.10%
Combo | GMDB | Deferred Variable Annuity | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	5.00%
Combo | GMDB | Deferred Variable Annuity | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	10.00%
Combo | GMIB | Direct Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 220
Separate Accounts	33,217
Total Account Values	33,437
Net Amount at Risk, gross	14,461
Net Amount at Risk, net of amounts reinsured	$ 13,066
Average attained age of contract holders (in years)	70 years
Weighted average years remaining until annuitization (in years)	8 months 12 days
Combo | GMIB | Direct Variable Annuity | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	3.00%
Combo | GMIB | Direct Variable Annuity | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	6.50%
Combo | GMIB | Deferred Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 1,090
Net Amount at Risk, gross	$ 296
Average attained age of contract holders (in years)	70 years
Percentage of policyholders over age 70	54.50%
Combo | GMIB | Deferred Variable Annuity | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	6.00%
Combo | GMIB | Deferred Variable Annuity | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates (as a percent)	6.00%