INVESTMENT SECURITIES - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest	$ 438
Debt securities in unrealized loss position, total	3,732		$ 1,765
Debt securities in unrealized loss position, 12 months or more	644		165
Gross unrealized losses, 12 months or more	(56)		(20)
Gross unrealized losses	(168)
Net unrealized gains (losses) recorded to earnings	238	$ (5,772)
Proceeds from investment securities sales and early redemptions by issuers	1,333	1,250
Debt and equity securities, realized gain	30	46
Debt and equity securities, realized losses and impairments	(60)	(17)
Equity securities without readily determinable fair values	$ 291		274
Fair value adjustments, including impairment		(93)
Baker Hughes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Remaining interest (in shares)	311.4
Ownership percentage	30.00%
Net unrealized gains (losses) recorded to earnings	$ 296	$ (5,710)
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments with a fair value	5,641		5,866
U.S. corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross unrealized losses	(79)		$ (26)
CMBS
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross unrealized losses	$ (57)

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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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