Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	$ 1,173	$ 1,238
Aggregate unpaid principal balance of assets for which fair value option was elected	1,382	1,469
Fair value option aggregate difference assets	(209)	(231)
Other assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	113	85
Aggregate unpaid principal balance of assets for which fair value option was elected	104	69
Fair value option aggregate difference assets	9	16
Other borrowed funds
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of liabilities for which fair value option was elected	29	39
Aggregate unpaid principal balance, other borrowed funds	30	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	505	507
Aggregate unpaid principal balance of assets for which fair value option was elected	518	520
Fair value option aggregate difference assets	(13)	(13)
Accruing loans 90 days or more past due \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	118	146
Aggregate unpaid principal balance of assets for which fair value option was elected	129	156
Fair value option aggregate difference assets	(11)	(10)
Nonaccrual loans \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	550	585
Aggregate unpaid principal balance of assets for which fair value option was elected	735	793
Fair value option aggregate difference assets	(185)	(208)
Residential mortgage loans held for sale \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	658	474
Aggregate unpaid principal balance of assets for which fair value option was elected	654	478
Fair value option aggregate difference assets	4	(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	623	432
Aggregate unpaid principal balance of assets for which fair value option was elected	613	429
Fair value option aggregate difference assets	10	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	6	6
Aggregate unpaid principal balance of assets for which fair value option was elected	6	6
Residential mortgage loans held for sale \| Nonaccrual loans \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	29	36
Aggregate unpaid principal balance of assets for which fair value option was elected	35	43
Fair value option aggregate difference assets	(6)	(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	77	238
Aggregate unpaid principal balance of assets for which fair value option was elected	77	228
Fair value option aggregate difference assets		$ 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.

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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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