INSURANCE LIABILITIES - Separate Account Investments, Hedging Programs and Variable and Interest-Sensitive Live Insurance Policies (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
GMDB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	$ 88,055		$ 88,055		$ 94,488
GMIB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	54,792		54,792		59,348
Direct Liabilities For Guarantees
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Opening Balance	925	$ 825	897	$ 812
Paid guarantee benefits	(13)	(3)	(26)	(10)
Other changes in reserves	35	21	76	41
Closing Balance	947	$ 843	947	$ 843
Adjustment to Assets held-for-sale			22
Equity | GMDB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	39,126		39,126		42,489
Equity | GMIB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	16,011		16,011		17,941
Fixed income | GMDB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	5,297		5,297		5,263
Fixed income | GMIB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	2,682		2,682		2,699
Balanced | GMDB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	42,696		42,696		45,871
Balanced | GMIB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	35,835		35,835		38,445
Other | GMDB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	936		936		865
Other | GMIB
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Separate Accounts	$ 264		$ 264		$ 263