INVESTMENT SECURITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest	$ 442		$ 442
Equity securities	5,318		5,318		$ 10,025
Gross unrealized losses, less than 12 months	(169)		(169)		(11)
Gross unrealized losses, 12 months or more	(33)		(33)		(20)
Estimated fair value, less than 12 months	2,413		2,413		724
Estimated fair value, 12 months or more	153		153		274
Gross unrealized losses	(202)		(202)		(31)
Net unrealized gains (losses) recorded to earnings	(776)	$ (89)	(4,619)	$ (131)
Proceeds from investment securities sales and early redemptions by issuers	833	2,318	3,538	6,652
Debt and equity securities, realized gain	17	10	145	86
Debt and equity securities, realized losses	(10)	(75)	(95)	(181)
Equity securities without readily determinable fair values	258		258		517
Fair value adjustments, including impairment			(163)	25
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments with a fair value	5,548		5,548		5,210
Baker Hughes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	5,102		5,102
Net unrealized gains (losses) recorded to earnings	(748)	$ (125)	(4,613)	$ (125)
CMBS
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross unrealized losses	(87)		(87)
U.S. corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross unrealized losses	$ (83)		$ (83)		$ (11)

Debt And Equity Securities, Realized Gain

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Proceeds From Sale Of Debt Securities, Available For Sale And Equity Securities, FV-NI

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) 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 debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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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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