INSURANCE LIABILITIES - Variable Annuity Contracts with GMDB and GMIB Features (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
GMDB
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 15,225
Separate Accounts	88,055	$ 94,488
Net Amount At Risk By Product And Guarantee, Account Value	103,280
Net Amount at Risk, gross	22,762
Net Amount at Risk, net of amounts reinsured	$ 22,180
Percentage of policyholders over age 70	19.80%
GMDB | Return of Premium
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 14,904
Separate Accounts	46,313
Net Amount At Risk By Product And Guarantee, Account Value	61,217
Net Amount at Risk, gross	167
Net Amount at Risk, net of amounts reinsured	$ 167
Percentage of policyholders over age 70	10.90%
GMDB | Ratchet
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 90
Separate Accounts	8,576
Net Amount At Risk By Product And Guarantee, Account Value	8,666
Net Amount at Risk, gross	207
Net Amount at Risk, net of amounts reinsured	$ 201
Percentage of policyholders over age 70	47.10%
GMDB | Roll-Up
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 57
Separate Accounts	2,914
Net Amount At Risk By Product And Guarantee, Account Value	2,971
Net Amount at Risk, gross	1,990
Net Amount at Risk, net of amounts reinsured	$ 1,414
Percentage of policyholders over age 70	69.30%
GMDB | Combo
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 174
Separate Accounts	30,252
Net Amount At Risk By Product And Guarantee, Account Value	30,426
Net Amount at Risk, gross	20,398
Net Amount at Risk, net of amounts reinsured	$ 20,398
Percentage of policyholders over age 70	52.40%
GMIB
Net Amount at Risk by Product and Guarantee [Line Items]
Separate Accounts	$ 54,792	$ 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 1 month 6 days
Immediate Variable Annuity | GMDB | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates	3.00%
Immediate Variable Annuity | GMDB | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates	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 2 months 12 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
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 7 months 6 days
Immediate Variable Annuity | GMDB | Roll-Up | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates	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	6.00%
Immediate Variable Annuity | GMDB | Combo
Net Amount at Risk by Product and Guarantee [Line Items]
Average attained age of policyholders (in years)	69 years 9 months 18 days
Immediate Variable Annuity | GMDB | Combo | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates	3.00%
Immediate Variable Annuity | GMDB | Combo | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates	6.50%
Immediate Variable Annuity | GMIB
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 241
Separate Accounts	54,792
Net Amount At Risk By Product And Guarantee, Account Value	55,033
Net Amount at Risk, gross	16,573
Net Amount at Risk, net of amounts reinsured	$ 14,248
Average attained age of policyholders (in years)	69 years 7 months 6 days
Weighted average years remaining until annuitization (in years)	2 years 7 months 6 days
Immediate Variable Annuity | GMIB | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates	3.00%
Immediate Variable Annuity | GMIB | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates	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
Net Amount at Risk, gross	0
Net Amount at Risk, 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
Net Amount at Risk, gross	0
Net Amount at Risk, net of amounts reinsured	0
Immediate Variable Annuity | GMIB | Roll-Up
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	18
Separate Accounts	22,463
Net Amount At Risk By Product And Guarantee, Account Value	22,481
Net Amount at Risk, gross	1,189
Net Amount at Risk, net of amounts reinsured	$ 376
Average attained age of policyholders (in years)	63 years 9 months 18 days
Weighted average years remaining until annuitization (in years)	5 years 10 months 24 days
Immediate Variable Annuity | GMIB | Roll-Up | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates	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	6.00%
Immediate Variable Annuity | GMIB | Combo
Net Amount at Risk by Product and Guarantee [Line Items]
General Account	$ 223
Separate Accounts	32,329
Net Amount At Risk By Product And Guarantee, Account Value	32,552
Net Amount at Risk, gross	15,384
Net Amount at Risk, net of amounts reinsured	$ 13,872
Average attained age of policyholders (in years)	69 years 9 months 18 days
Weighted average years remaining until annuitization (in years)	8 months 12 days
Immediate Variable Annuity | GMIB | Combo | Minimum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates	3.00%
Immediate Variable Annuity | GMIB | Combo | Maximum
Net Amount at Risk by Product and Guarantee [Line Items]
Range of contractually specified interest rates	6.50%