INSURANCE LIABILITIES - Separate Account Investments, Hedging Programs and Variable and Interest-Sensitive Live Insurance Policies (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
GMDB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	$ 91,323		$ 91,323		$ 94,489
GMIB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	56,341		56,341		59,348
Direct Liabilities For Guarantees
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Opening Balance	948	$ 845	898	$ 813
Paid guarantee benefits	(6)	(7)	(32)	(16)
Other changes in reserves	60	54	136	95
Closing Balance	1,002	$ 892	1,002	$ 892
Adjustment to Assets held-for-sale			22
Equity | GMDB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	41,259		41,259		42,489
Equity | GMIB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	16,739		16,739		17,941
Fixed income | GMDB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	5,371		5,371		5,263
Fixed income | GMIB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	2,679		2,679		2,699
Balanced | GMDB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	43,684		43,684		45,872
Balanced | GMIB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	36,656		36,656		38,445
Other | GMDB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	1,009		1,009		865
Other | GMIB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	$ 267		$ 267		$ 263