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ALLOWANCE FOR CREDIT LOSSES, NONACCRUING LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Nonaccrual Loans and Leases by Class (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	$ 1,008	$ 1,019
90+ days past due and accruing	46	62
Nonaccrual with no related ACL	510	380
Commercial
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	382	458
90+ days past due and accruing	12	21
Nonaccrual with no related ACL	93	58
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	281	280
90+ days past due and accruing	3	20
Nonaccrual with no related ACL	56	56
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	100	176
90+ days past due and accruing	9	0
Nonaccrual with no related ACL	37	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	626	561
90+ days past due and accruing	34	41
Nonaccrual with no related ACL	417	322
Retail | Residential mortgages
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	237	167
90+ days past due and accruing	23	30
Nonaccrual with no related ACL	178	96
Retail | Home equity
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	269	276
90+ days past due and accruing	0	0
Nonaccrual with no related ACL	202	207
Retail | Automobile
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	70	72
90+ days past due and accruing	0	0
Nonaccrual with no related ACL	33	17
Retail | Education
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	22	18
90+ days past due and accruing	2	2
Nonaccrual with no related ACL	2	2
Retail | Other retail
Financing Receivable, Past Due [Line Items]
Nonaccrual loans and leases	28	28
90+ days past due and accruing	9	9
Nonaccrual with no related ACL	$ 2	$ 0

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (d)
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