INVESTMENT SECURITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest	$ 432
Allowance for credit losses on investment securities	24
Investment fair value	5,245		$ 10,025
Net unrealized gains (losses) recorded to earnings	(5,772)
Gross unrealized gains	4,792		5,736
Gross unrealized losses	(716)		(31)
Proceeds from investment securities sales and early redemptions by issuers	1,250	$ 1,421
Debt and equity securities, realized gain	46	44
Debt and equity securities, realized losses	(17)	$ (39)
Gross unrealized losses, less than 12 months	(685)		(11)
Gross unrealized losses, 12 months or more	(31)		(20)
Estimated fair value, less than 12 months	6,253		724
Estimated fair value, 12 months or more	173		274
Equity securities without readily determinable fair values	429		517
Fair value adjustments, including impairment	(93)
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments with a fair value	5,046		5,210
Baker Hughes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment fair value	4,083
Net unrealized gains (losses) recorded to earnings	(5,710)
GE Capital
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains (losses) recorded to earnings	(85)
CMBS
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross unrealized losses	(114)
U.S. corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross unrealized gains	3,795		4,636
Gross unrealized losses	(493)		$ (11)
Energy \| U.S. corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unrealized loss position	(313)
Consumer \| U.S. corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unrealized loss position	$ (57)

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