INVESTMENTS (DERIVATIVES GROSS COLLATERAL AMOUNTS ASSETS) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Offsetting Assets [Line Items]
Repurchase agreements, net amount presented on the Balance Sheet	$ 1,837	$ 1,996
Net amounts presented in the balance sheets		(35)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	14,080
Securities sold under agreement to repurchase
Offsetting Assets [Line Items]
Repurchase agreements, net amount presented on the Balance Sheet		1,992
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities		(1,986)
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash		(2)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	(64)	4
Reverse repurchase agreements [Abstract]
Securities purchased under agreements to resell, net amount presented in the Balance Sheet,		0
Reverse repurchase agreements, collateral securities received		0
Reverse repurchase agreements, collateral cash received		0
Reverse repurchase agreements, net amounts		0
Other
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	3,896	2,121
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(1,381)	71
Derivative Asset, Fair Value, Amount Offset Against Collateral	2,515	2,192
Derivative
Offsetting Assets [Line Items]
Derivative Asset, Fair Value, Amount Offset Against Collateral	42	125
Other Financial Instruments
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	2,473	2,067
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	2,473	$ 2,067
Securities purchased under agreement to resell
Reverse repurchase agreements [Abstract]
Securities purchased under agreements to resell, net amount presented in the Balance Sheet,	0
Reverse repurchase agreements, collateral securities received	0
Reverse repurchase agreements, collateral cash received	0
Reverse repurchase agreements, net amounts	$ 0