INVESTMENT SECURITIES - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest, current	$ 496		$ 466
Accrued interest, current, statement of financial position	All other current assets (Note 10)		All other current assets (Note 10)
Debt securities in unrealized loss position, total	$ 20,413		$ 18,730
Debt securities in unrealized loss position, 12 months or more	16,711		17,146
Gross unrealized losses, 12 months or more	(2,584)		(2,370)
Gross unrealized losses	(2,661)		(2,406)
Investments without readily determinable fair value	1,092		1,012
Fair value adjustments, including impairment	23	$ 9
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	6,991		6,841
CMBS
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross unrealized losses	(149)
Asset-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross unrealized losses	(68)
Insurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments without readily determinable fair value	$ 1,019		$ 939
GE HealthCare
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, investment interest (in shares)	30.5
Equity securities, ownership percentage	6.70%

Equity Securities, FV-NI, Ownership Percentage

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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, after allowance for credit loss, of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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Indicates line item in statement of financial position that includes accrued interest, after allowance for credit loss, on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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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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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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