Fair Value (Fair Value Option - Fair Value and Principal Balances (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Loans Held For Sale \| Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	$ 628	$ 474
Aggregate Unpaid Principal Balance - Assets	635	478
Difference - Assets	(7)	(4)
Loans Held For Sale \| Accruing loans less than 90 days past due \| Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	588	432
Aggregate Unpaid Principal Balance - Assets	588	429
Difference - Assets		3
Loans Held For Sale \| Accruing loans less than 90 days past due \| Commercial Mortgage
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	203	238
Aggregate Unpaid Principal Balance - Assets	200	228
Difference - Assets	3	10
Loans Held For Sale \| Accruing loans 90 days or more past due \| Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	11	6
Aggregate Unpaid Principal Balance - Assets	11	6
Difference - Assets
Loans Held For Sale \| Nonaccrual loans \| Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	29	36
Aggregate Unpaid Principal Balance - Assets	36	43
Difference - Assets	(7)	(7)
Loans \| Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	1,156	1,238
Aggregate Unpaid Principal Balance - Assets	1,360	1,469
Difference - Assets	(204)	(231)
Loans \| Accruing loans less than 90 days past due \| Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	494	507
Aggregate Unpaid Principal Balance - Assets	505	520
Difference - Assets	(11)	(13)
Loans \| Accruing loans 90 days or more past due \| Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	126	146
Aggregate Unpaid Principal Balance - Assets	137	156
Difference - Assets	(11)	(10)
Loans \| Nonaccrual loans \| Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	536	585
Aggregate Unpaid Principal Balance - Assets	718	793
Difference - Assets	(182)	(208)
Other assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	133	85
Aggregate Unpaid Principal Balance - Assets	142	69
Difference - Assets	(9)	16
Other borrowed funds
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Liabilities	34	39
Aggregate Unpaid Principal Balance - Liabilities	35	40
Difference - Liabilities	(1)	(1)
Other Liabilities With Contractual Unpaid Principal Balance
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Liabilities	28
Aggregate Unpaid Principal Balance - Liabilities	32
Difference - Liabilities	(4)
Other Liabilities Without Contractual Unpaid Principal Balance
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Liabilities	106	124
Aggregate Unpaid Principal Balance - Liabilities
Difference - Liabilities	$ 106	$ 124

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.

+ Details

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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.

+ Details

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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.

+ 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

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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