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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments not Recorded at Fair Value (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Financial assets:
Securities held to maturity, carrying value	[1]	$ 3,235	$ 3,202
Securities held-to-maturity, fair value		3,357	3,242
Other loans held for sale, carrying value		439	1,384
Other loans held for sale, fair value		439	1,384
Loans and leases		123,090	119,088
Loans and leases, fair value		123,678	119,792
Other investment securities, at cost, carrying value		604	807
Other investment securities, at cost, estimated fair value		604	807
Financial liabilities:
Deposits, carrying value		147,164	125,313
Deposits, fair value		147,223	125,340
Short-term borrowed funds		243	274
Short-term borrowed funds, fair value		243	274
Long-term borrowed funds, carrying value		8,346	14,047
Long-term borrowed funds, fair value		8,850	14,228
Level 1
Financial assets:
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
Other investment securities, at cost, carrying value		0	0
Other investment securities, at cost, estimated fair value		0	0
Financial liabilities:
Deposits, carrying value		0	0
Deposits, fair value		0	0
Short-term borrowed funds		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
Financial assets:
Securities held to maturity, carrying value		2,342	3,202
Securities held-to-maturity, fair value		2,464	3,242
Other loans held for sale, carrying value		0	0
Other loans held for sale, fair value		0	0
Loans and leases		758	312
Loans and leases, fair value		758	312
Other investment securities, at cost, carrying value		596	807
Other investment securities, at cost, estimated fair value		596	807
Financial liabilities:
Deposits, carrying value		147,164	125,313
Deposits, fair value		147,223	125,340
Short-term borrowed funds		243	274
Short-term borrowed funds, fair value		243	274
Long-term borrowed funds, carrying value		8,346	14,047
Long-term borrowed funds, fair value		8,850	14,228
Level 3
Financial assets:
Securities held to maturity, carrying value		893	0
Securities held-to-maturity, fair value		893	0
Other loans held for sale, carrying value		439	1,384
Other loans held for sale, fair value		439	1,384
Loans and leases		122,332	118,776
Loans and leases, fair value		122,920	119,480
Other investment securities, at cost, carrying value		8	0
Other investment securities, at cost, estimated fair value		8	0
Financial liabilities:
Deposits, carrying value		0	0
Deposits, fair value		0	0
Short-term borrowed funds		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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