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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments not Recorded at Fair Value (Details) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity, carrying value	[1]	$ 2,995	$ 3,235
Securities held-to-maturity, fair value		3,077	3,357
Other loans held for sale, carrying value		75	439
Other loans held for sale, fair value		75	439
Loans and leases		122,195	123,090
Loans and leases, fair value		122,365	123,678
Equity securities, at cost, carrying value		603	604
Equity securities, at cost, fair value		603	604
Deposits, carrying value		151,349	147,164
Deposits, fair value		151,384	147,223
Short-term borrowed funds, carrying value		70	243
Short-term borrowed funds, fair value		70	243
Long-term borrowed funds, carrying value		8,316	8,346
Long-term borrowed funds, fair value		8,618	8,850
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity, carrying value		0	0
Securities held-to-maturity, fair value		0	0
Other loans held for sale, carrying value		0	0
Other loans held for sale, fair value		0	0
Loans and leases		0	0
Loans and leases, fair value		0	0
Equity securities, at cost, carrying value		0	0
Equity securities, at cost, fair value		0	0
Deposits, carrying value		0	0
Deposits, fair value		0	0
Short-term borrowed funds, carrying value		0	0
Short-term borrowed funds, fair value		0	0
Long-term borrowed funds, carrying value		0	0
Long-term borrowed funds, fair value		0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity, carrying value		2,139	2,342
Securities held-to-maturity, fair value		2,223	2,464
Other loans held for sale, carrying value		0	0
Other loans held for sale, fair value		0	0
Loans and leases		724	758
Loans and leases, fair value		724	758
Equity securities, at cost, carrying value		595	596
Equity securities, at cost, fair value		595	596
Deposits, carrying value		151,349	147,164
Deposits, fair value		151,384	147,223
Short-term borrowed funds, carrying value		70	243
Short-term borrowed funds, fair value		70	243
Long-term borrowed funds, carrying value		8,316	8,346
Long-term borrowed funds, fair value		8,618	8,850
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity, carrying value		856	893
Securities held-to-maturity, fair value		854	893
Other loans held for sale, carrying value		75	439
Other loans held for sale, fair value		75	439
Loans and leases		121,471	122,332
Loans and leases, fair value		121,641	122,920
Equity securities, at cost, carrying value		8	8
Equity securities, at cost, fair value		8	8
Deposits, carrying value		0	0
Deposits, fair value		0	0
Short-term borrowed funds, carrying value		0	0
Short-term borrowed funds, fair value		0	0
Long-term borrowed funds, carrying value		0	0
Long-term borrowed funds, fair value		$ 0	$ 0
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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The amount of other loans receivable that will be sold to other entities.

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Fair value portion of other loans receivable held-for-sale.

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Total Other Investment Securities At Cost, Amortized Cost Basis

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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