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ALLOWANCE FOR CREDIT LOSSES, NONACCRUAL LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Nonaccrual Loans and Leases by Class (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	$ 747	$ 1,019
90+ days past due and accruing	312	62
Nonaccrual with no related ACL	425	380
Commercial
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	269	458
90+ days past due and accruing	4	21
Nonaccrual with no related ACL	62	58
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	170	280
90+ days past due and accruing	4	20
Nonaccrual with no related ACL	61	56
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	98	176
90+ days past due and accruing	0	0
Nonaccrual with no related ACL	1	2
Commercial | Leases
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	1	2
90+ days past due and accruing	0	1
Nonaccrual with no related ACL	0	0
Retail
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	478	561
90+ days past due and accruing	308	41
Nonaccrual with no related ACL	363	322
Retail | Residential mortgage
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	164	167
90+ days past due and accruing	293	30
Nonaccrual with no related ACL	142	96
Retail | Home equity
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	216	276
90+ days past due and accruing	0	0
Nonaccrual with no related ACL	188	207
Retail | Automobile
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	55	72
90+ days past due and accruing	0	0
Nonaccrual with no related ACL	29	17
Retail | Education
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	23	18
90+ days past due and accruing	1	2
Nonaccrual with no related ACL	2	2
Retail | Other retail
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	20	28
90+ days past due and accruing	14	9
Nonaccrual with no related ACL	2	0
Retail | FHA, VA And USDA Loans
Financing Receivable, Past Due [Line Items]
90+ days past due and accruing	$ 289	$ 21

X

- Definition

Amount of financing receivable on nonaccrual status with no allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (d)
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+ References

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