Loans and ACL - Narrative (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)
Financing Receivable
Unfunded lending commitments related to the modified obligations	$ 419	$ 419
Loan Restructuring, Trial Modifications, Amount	88
Commercial:
Financing Receivable
Allowance for Loan and Lease Losses, Period Increase (Decrease)	212	368
Consumer:
Financing Receivable
Allowance for Loan and Lease Losses, Period Increase (Decrease)	(95)	(144)
Consumer: \| Student
Financing Receivable
Loans Transferred to the Third Party Purchaser	4,700	$ 4,700
Charge-offs related to the sale	$ 98

Loans Transferred to the Third Party Purchaser

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- Definition

Amount of reduction of allowance reserve for credit loss arising from sale of loan and lease portfolios.

+ References

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-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

Amount of increase (decrease) of allowance reserve for credit loss.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of financing receivable modified on trial basis.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-33

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- Definition

Amount of commitment to lend additional funds to debtor experiencing financial difficulty for which creditor has modified terms of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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