INVESTMENTS - DERIVATIVES OFFSETTING FINANCIAL LIABILITIES (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Securities sold under agreement to repurchase
Net Amounts Presented in the Balance Sheets	$ 1,900	$ 1,887
Expense in securities sold under agreement to repurchase	6,228	14,228
Equity contracts
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	1,810	1,555
Gross Amounts Offset in the Balance Sheets	1,810	1,555
Net Amounts Presented in the Balance Sheets	0	0
Interest rate contracts
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	653	191
Gross Amounts Offset in the Balance Sheets	653	191
Net Amounts Presented in the Balance Sheets	0	0
Credit contracts
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	3	3
Gross Amounts Offset in the Balance Sheets	3	3
Net Amounts Presented in the Balance Sheets	0	0
Currency
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	9	10
Gross Amounts Offset in the Balance Sheets	9	10
Net Amounts Presented in the Balance Sheets	0	0
Margin
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	0	0
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts Presented in the Balance Sheets	0	0
Securities sold under agreement to repurchase
Expense in securities sold under agreement to repurchase	27	24
Collateral
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	2,135	1,855
Gross Amounts Offset in the Balance Sheets	2,135	1,855
Net Amounts Presented in the Balance Sheets	0	0
Securities sold under agreement to repurchase
Expense in securities sold under agreement to repurchase	65	4
Total Derivatives, subject to an ISDA Master Agreement
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	4,610	3,614
Gross Amounts Offset in the Balance Sheets	4,610	3,614
Net Amounts Presented in the Balance Sheets	0	0
Other financial liabilities
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	2,205	2,663
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts Presented in the Balance Sheets	2,205	2,663
Other liabilities
Offsetting Liabilities [Line Items]
Gross Amounts Recognized	6,815	6,277
Gross Amounts Offset in the Balance Sheets	4,610	3,614
Net Amounts Presented in the Balance Sheets	2,205	2,663
Securities sold under agreement to repurchase
Securities sold under agreement to repurchase
Gross Amounts Recognized	1,891	1,882
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts Presented in the Balance Sheets	$ 1,891	$ 1,882

The gross amount of liabilities offset to determine the net amounts presented in the statement of financial position.

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Presents the net of gross amounts of recognized liabilities and the gross amount offset in the Statement of Financial Position.

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Fair value of liability associated with 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.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after the 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. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Amount of asset associated with 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.

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