INVESTMENT SECURITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities without readily determinable fair values	$ 594		$ 594
Upward adjustment	35		43
Impairment loss	10		15
Gross realized gains on debt securities	9	$ 14	22	$ 109
Gross realized losses	(3)	(2)	(3)	(3)
Proceeds from investment securities sales and early redemptions by issuers	385	$ 701	706	$ 1,774
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	$ 4,268		$ 4,268		$ 4,413

Equity Securities Without Readily Determinable Fair Value, Downward Price Adjustment

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Equity Securities Without Readily Determinable Fair Value, Upward Price Adjustment

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in equity security without readily determinable fair value.

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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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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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