Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	$ 1,259	$ 1,310
Aggregate unpaid principal balance of assets for which fair value option was elected	1,507	1,568
Fair value option aggregate difference assets	(248)	(258)
Other assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	64	80
Aggregate unpaid principal balance of assets for which fair value option was elected	65	80
Fair value option aggregate difference assets	(1)
Other borrowed funds
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of liabilities for which fair value option was elected	32	31
Aggregate unpaid principal balance, other borrowed funds	33	32
Difference, Other borrowed funds	(1)	(1)
Other liabilities
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of liabilities for which fair value option was elected	127	196
Difference, Other borrowed funds	127	196
Accruing loans less than 90 days past due \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	510	509
Aggregate unpaid principal balance of assets for which fair value option was elected	523	521
Fair value option aggregate difference assets	(13)	(12)
Accruing loans 90 days or more past due \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	132	155
Aggregate unpaid principal balance of assets for which fair value option was elected	143	167
Fair value option aggregate difference assets	(11)	(12)
Nonaccrual loans \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	617	646
Aggregate unpaid principal balance of assets for which fair value option was elected	841	880
Fair value option aggregate difference assets	(224)	(234)
Residential mortgage loans held for sale \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	686	654
Aggregate unpaid principal balance of assets for which fair value option was elected	713	687
Fair value option aggregate difference assets	(27)	(33)
Residential mortgage loans held for sale \| Accruing loans less than 90 days past due \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	651	609
Aggregate unpaid principal balance of assets for which fair value option was elected	671	633
Fair value option aggregate difference assets	(20)	(24)
Residential mortgage loans held for sale \| Accruing loans 90 days or more past due \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	2	5
Aggregate unpaid principal balance of assets for which fair value option was elected	2	5
Residential mortgage loans held for sale \| Nonaccrual loans \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	33	40
Aggregate unpaid principal balance of assets for which fair value option was elected	40	49
Fair value option aggregate difference assets	(7)	(9)
Commercial mortgage loans held for sale \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	64	276
Aggregate unpaid principal balance of assets for which fair value option was elected	95	300
Fair value option aggregate difference assets	(31)	(24)
Commercial mortgage loans held for sale \| Accruing loans less than 90 days past due \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	49	261
Aggregate unpaid principal balance of assets for which fair value option was elected	51	256
Fair value option aggregate difference assets	(2)	5
Commercial mortgage loans held for sale \| Nonaccrual loans \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	15	15
Aggregate unpaid principal balance of assets for which fair value option was elected	44	44
Fair value option aggregate difference assets	$ (29)	$ (29)

Represents the aggregate unpaid principal balance of assets for which the fair value option was elected.

No definition available.

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- Definition

Represents the aggregate unpaid principal balance of liabilities for which the fair value option was elected.

+ References

No definition available.

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- Definition

Represents the fair value of assets for which the fair value option was elected.

+ References

No definition available.

+ Details

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- Definition

Represents the fair value of liabilities for which the fair value option was elected.

+ References

No definition available.

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- Definition

For assets for which the fair value option has been elected, this item represents the difference between the fair value and the aggregate unpaid principal balance for those assets.

+ References

No definition available.

+ Details

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For liabilities for which the fair value option has been elected, this item represents the difference between the fair value and the aggregate unpaid principal balance for those assets.

+ References

No definition available.

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-30

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-31

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-32

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