INSURANCE LIABILITIES - Separate Account Investments, Hedging Programs and Variable and Interest-Sensitive Live Insurance Policies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
GMDB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	$ 78,940		$ 94,488
GMIB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	50,200		59,348
Direct Liabilities For Guarantees
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Opening Balance	897	$ 812
Paid guarantee benefits	(13)	(7)
Other changes in reserves	41	20
Closing Balance	925	$ 825
Adjustment to Assets held-for-sale	22
Equity | GMDB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	32,913		42,489
Equity | GMIB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	13,765		17,941
Fixed income | GMDB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	5,151		5,263
Fixed income | GMIB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	2,680		2,699
Balanced | GMDB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	39,965		45,871
Balanced | GMIB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	33,483		38,445
Other | GMDB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	911		865
Other | GMIB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	$ 272		$ 263