INVESTMENTS - DERIVATIVES GROSS COLLATERAL AMOUNTS LIABILITIES (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Offsetting Liabilities [Line Items]
Fair Value of Assets	$ 1,900	$ 1,887
Collateral (Received)/Held
Expense in securities sold under agreement to repurchase	6,228	14,228
Initial Margin
Collateral (Received)/Held
Expense in securities sold under agreement to repurchase	9	5
Securities sold under agreement to repurchase
Offsetting Liabilities [Line Items]
Fair Value of Assets	1,891	1,882
Collateral (Received)/Held
Financial Instruments	(1,891)	(1,988)
Cash	0	(21)
Net Amounts	$ 0	(127)
Securities sold under agreement to repurchase \| Other financial liabilities
Offsetting Liabilities [Line Items]
Fair Value of Assets		2,663
Collateral (Received)/Held
Financial Instruments		0
Cash		0
Net Amounts		2,663
Securities sold under agreement to repurchase \| Other liabilities
Offsetting Liabilities [Line Items]
Fair Value of Assets		2,663
Collateral (Received)/Held
Financial Instruments		0
Cash		0
Net Amounts		$ 2,663

Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Amount, after effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price offset against a right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Amount of right to receive securities collateral under master netting arrangements that have not been offset against securities sold under agreement to repurchase.

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