INSURANCE LIABILITIES - Variable Annuity Contracts with GMDB and GMIB Features and Buybacks (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
GMDB
Net Amount at Risk by Product and Guarantee [Line Items]
Separate Accounts	$ 88,055	$ 94,488
GMDB | Direct Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	15,225
Separate Accounts	88,055
Total Account Values	103,280
Net Amount at Risk, gross	22,762
Net Amount at Risk, net of amounts reinsured	$ 22,180
Average attained age of contractholders (in years)	55 years 1 month 6 days
Percentage of policyholders over age 70	19.80%
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	$ 6,902
Net Amount at Risk, gross	$ 472
Average attained age of contractholders (in years)	73 years
Percentage of policyholders over age 70	65.00%
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	$ 54,792	$ 59,348
GMIB | Direct Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	241
Separate Accounts	54,792
Total Account Values	55,033
Net Amount at Risk, gross	16,573
Net Amount at Risk, net of amounts reinsured	$ 14,248
Average attained age of contractholders (in years)	67 years 7 months 6 days
Weighted average years remaining until annuitization (in years)	2 years 7 months 6 days
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	$ 2,135
Net Amount at Risk, gross	$ 369
Average attained age of contractholders (in years)	71 years
Percentage of policyholders over age 70	59.00%
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	$ 14,904
Separate Accounts	46,313
Total Account Values	61,217
Net Amount at Risk, gross	167
Net Amount at Risk, net of amounts reinsured	$ 167
Average attained age of contractholders (in years)	51 years 2 months 12 days
Percentage of policyholders over age 70	10.90%
Return of Premium | GMDB | Deferred Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 856
Net Amount at Risk, gross	$ 6
Average attained age of contractholders (in years)	68 years
Percentage of policyholders over age 70	46.00%
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	830
Net Amount at Risk, gross	$ 1
Average attained age of contractholders (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	$ 90
Separate Accounts	8,576
Total Account Values	8,666
Net Amount at Risk, gross	207
Net Amount at Risk, net of amounts reinsured	$ 201
Average attained age of contractholders (in years)	68 years
Percentage of policyholders over age 70	47.10%
Ratchet | GMDB | Deferred Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 4,761
Net Amount at Risk, gross	$ 281
Average attained age of contractholders (in years)	73 years
Percentage of policyholders over age 70	65.00%
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	40
Net Amount at Risk, gross	$ 0
Average attained age of contractholders (in years)	74 years
Percentage of policyholders over age 70	62.00%
Roll-Up | GMDB | Direct Variable Annuity
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 57
Separate Accounts	2,914
Total Account Values	2,971
Net Amount at Risk, gross	1,990
Net Amount at Risk, net of amounts reinsured	$ 1,414
Average attained age of contractholders (in years)	74 years 7 months 6 days
Percentage of policyholders over age 70	69.30%
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	$ 244
Net Amount at Risk, gross	$ 16
Average attained age of contractholders (in years)	78 years
Percentage of policyholders over age 70	80.00%
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	$ 18
Separate Accounts	22,463
Total Account Values	22,481
Net Amount at Risk, gross	1,189
Net Amount at Risk, net of amounts reinsured	$ 376
Average attained age of contractholders (in years)	63 years 9 months 18 days
Weighted average years remaining until annuitization (in years)	1 year 7 months 6 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	$ 211
Net Amount at Risk, gross	$ 32
Average attained age of contractholders (in years)	72 years
Percentage of policyholders over age 70	63.00%
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	$ 174
Separate Accounts	30,252
Total Account Values	30,426
Net Amount at Risk, gross	20,398
Net Amount at Risk, net of amounts reinsured	$ 20,398
Average attained age of contractholders (in years)	69 years 9 months 18 days
Percentage of policyholders over age 70	52.40%
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	$ 1,041
Net Amount at Risk, gross	$ 169
Average attained age of contractholders (in years)	76 years
Percentage of policyholders over age 70	76.00%
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	$ 223
Separate Accounts	32,329
Total Account Values	32,552
Net Amount at Risk, gross	15,384
Net Amount at Risk, net of amounts reinsured	$ 13,872
Average attained age of contractholders (in years)	69 years 9 months 18 days
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	$ 1,054
Net Amount at Risk, gross	$ 336
Average attained age of contractholders (in years)	70 years
Percentage of policyholders over age 70	54.00%
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%