Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	$ 1,149	$ 1,156
Aggregate unpaid principal balance of assets for which fair value option was elected	1,346	1,360
Fair value option aggregate difference assets	(197)	(204)
Other assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	131	133
Aggregate unpaid principal balance of assets for which fair value option was elected	130	142
Fair value option aggregate difference assets	1	(9)
Other borrowed funds
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of liabilities for which fair value option was elected	33	34
Aggregate unpaid principal balance, other borrowed funds	35	35
Difference, Other borrowed funds	(2)	(1)
Fair Value Of Liabilities For Which Fair Value Option Was Elected	33	34
Other Liabilities With Contractual Unpaid Principal Balance
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of liabilities for which fair value option was elected	28	28
Aggregate unpaid principal balance, other borrowed funds	31	32
Difference, Other borrowed funds	(3)	(4)
Fair Value Of Liabilities For Which Fair Value Option Was Elected	28	28
Other Liabilities Without Contractual Unpaid Principal Balance
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of liabilities for which fair value option was elected	86	106
Aggregate unpaid principal balance, other borrowed funds	0	0
Difference, Other borrowed funds	86	106
Fair Value Of Liabilities For Which Fair Value Option Was Elected	86	106
Interest-bearing deposits
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of liabilities for which fair value option was elected	1,160	0
Aggregate unpaid principal balance, other borrowed funds	1,160	0
Difference, Other borrowed funds	0	0
Fair Value Of Liabilities For Which Fair Value Option Was Elected	1,160	0
Accruing loans less than 90 days past due \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	746	494
Aggregate unpaid principal balance of assets for which fair value option was elected	827	505
Fair value option aggregate difference assets	(81)	(11)
Accruing loans 90 days or more past due \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	126	126
Aggregate unpaid principal balance of assets for which fair value option was elected	138	137
Fair value option aggregate difference assets	(12)	(11)
Nonaccrual loans \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	277	536
Aggregate unpaid principal balance of assets for which fair value option was elected	381	718
Fair value option aggregate difference assets	(104)	(182)
Residential mortgage loans held for sale \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	542	628
Aggregate unpaid principal balance of assets for which fair value option was elected	542	635
Fair value option aggregate difference assets	0	(7)
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	520	588
Aggregate unpaid principal balance of assets for which fair value option was elected	518	588
Fair value option aggregate difference assets	2	0
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	13	11
Aggregate unpaid principal balance of assets for which fair value option was elected	13	11
Fair value option aggregate difference assets	0	0
Residential mortgage loans held for sale \| Nonaccrual loans \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	9	29
Aggregate unpaid principal balance of assets for which fair value option was elected	11	36
Fair value option aggregate difference assets	(2)	(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	465	203
Aggregate unpaid principal balance of assets for which fair value option was elected	460	200
Fair value option aggregate difference assets	$ 5	$ 3

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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