Loans and ACL - Nonperforming Loans (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Nonperforming [Line Items]
Recorded Investment Without an ALLL	$ 80	$ 204
Recorded Investment With an ALLL	1,112	984
Commercial: \| Commercial and industrial
Financing Receivable, Nonperforming [Line Items]
Recorded Investment Without an ALLL	68	120
Recorded Investment With an ALLL	326	278
Commercial: \| CRE
Financing Receivable, Nonperforming [Line Items]
Recorded Investment Without an ALLL	11	75
Recorded Investment With an ALLL	106	7
Commercial: \| Commercial construction
Financing Receivable, Nonperforming [Line Items]
Recorded Investment Without an ALLL	0	0
Recorded Investment With an ALLL	1	0
Consumer: \| Residential mortgage
Financing Receivable, Nonperforming [Line Items]
Recorded Investment Without an ALLL	0	4
Recorded Investment With an ALLL	233	236
Consumer: \| Home equity
Financing Receivable, Nonperforming [Line Items]
Recorded Investment Without an ALLL	1	2
Recorded Investment With an ALLL	131	171
Consumer: \| Indirect auto
Financing Receivable, Nonperforming [Line Items]
Recorded Investment Without an ALLL	0	3
Recorded Investment With an ALLL	270	286
Consumer: \| Other consumer
Financing Receivable, Nonperforming [Line Items]
Recorded Investment Without an ALLL	0	0
Recorded Investment With an ALLL	$ 45	$ 6

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- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-14A

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- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

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