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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments not Recorded at Fair Value (Details) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities held to maturity, carrying value	[1]	$ 2,492	$ 3,235
Debt Securities held-to-maturity, Fair Value		2,567	3,357
Other loans held for sale, carrying value		93	439
Other loans held for sale, fair value		93	439
Loans and leases		123,318	123,090
Loans and leases, fair value		123,318	123,678
Other assets, carrying value		616	604
Other assets, fair value		616	604
Deposits, carrying value		152,221	147,164
Deposits, fair value		152,237	147,223
Short-term borrowed funds, carrying value		8	243
Short-term borrowed funds, fair value		8	243
Long-term borrowed funds, carrying value		6,947	8,346
Long-term borrowed funds, fair value		7,260	8,850
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities held to maturity, carrying value		0	0
Debt 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
Other assets, carrying value		0	0
Other assets, 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]
Debt securities held to maturity, carrying value		1,705	2,342
Debt Securities held-to-maturity, Fair Value		1,778	2,464
Other loans held for sale, carrying value		0	0
Other loans held for sale, fair value		0	0
Loans and leases		585	758
Loans and leases, fair value		585	758
Other assets, carrying value		593	596
Other assets, fair value		593	596
Deposits, carrying value		152,221	147,164
Deposits, fair value		152,237	147,223
Short-term borrowed funds, carrying value		8	243
Short-term borrowed funds, fair value		8	243
Long-term borrowed funds, carrying value		6,947	8,346
Long-term borrowed funds, fair value		7,260	8,850
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities held to maturity, carrying value		787	893
Debt Securities held-to-maturity, Fair Value		789	893
Other loans held for sale, carrying value		93	439
Other loans held for sale, fair value		93	439
Loans and leases		122,733	122,332
Loans and leases, fair value		122,733	122,920
Other assets, carrying value		23	8
Other assets, fair value		23	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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Total Other Investment Securities At Cost, Amortized Cost Basis

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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