Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	$ 1,217	$ 1,238
Aggregate unpaid principal balance of assets for which fair value option was elected	1,441	1,469
Fair value option aggregate difference assets	(224)	(231)
Other assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	101	85
Aggregate unpaid principal balance of assets for which fair value option was elected	95	69
Fair value option aggregate difference assets	6	16
Other borrowed funds
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of liabilities for which fair value option was elected	38	39
Aggregate unpaid principal balance, other borrowed funds	39	40
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	98	124
Difference, Other borrowed funds	98	124
Accruing loans less than 90 days past due \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	515	507
Aggregate unpaid principal balance of assets for which fair value option was elected	527	520
Fair value option aggregate difference assets	(12)	(13)
Accruing loans 90 days or more past due \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	130	146
Aggregate unpaid principal balance of assets for which fair value option was elected	141	156
Fair value option aggregate difference assets	(11)	(10)
Nonaccrual loans \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	572	585
Aggregate unpaid principal balance of assets for which fair value option was elected	773	793
Fair value option aggregate difference assets	(201)	(208)
Residential mortgage loans held for sale \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	520	474
Aggregate unpaid principal balance of assets for which fair value option was elected	528	478
Fair value option aggregate difference assets	(8)	(4)
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	480	432
Aggregate unpaid principal balance of assets for which fair value option was elected	481	429
Fair value option aggregate difference assets	(1)	3
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	5	6
Aggregate unpaid principal balance of assets for which fair value option was elected	5	6
Residential mortgage loans held for sale \| Nonaccrual loans \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	35	36
Aggregate unpaid principal balance of assets for which fair value option was elected	42	43
Fair value option aggregate difference assets	(7)	(7)
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	201	238
Aggregate unpaid principal balance of assets for which fair value option was elected	200	228
Fair value option aggregate difference assets	$ 1	$ 10

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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- Definition

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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