Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Loans Held For Sale \| Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	$ 474	$ 654
Aggregate Unpaid Principal Balance - Assets	478	687
Difference - Assets	(4)	(33)
Loans Held For Sale \| Commercial Mortgage
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	238	276
Aggregate Unpaid Principal Balance - Assets	228	300
Difference - Assets	10	(24)
Loans Held For Sale \| Accruing loans less than 90 days past due \| Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	432	609
Aggregate Unpaid Principal Balance - Assets	429	633
Difference - Assets	3	(24)
Loans Held For Sale \| Accruing loans less than 90 days past due \| Commercial Mortgage
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	238	261
Aggregate Unpaid Principal Balance - Assets	228	256
Difference - Assets	10	5
Loans Held For Sale \| Accruing loans 90 days or more past due \| Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	6	5
Aggregate Unpaid Principal Balance - Assets	6	5
Difference - Assets
Loans Held For Sale \| Nonaccrual loans \| Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	36	40
Aggregate Unpaid Principal Balance - Assets	43	49
Difference - Assets	(7)	(9)
Loans Held For Sale \| Nonaccrual loans \| Commercial Mortgage
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets		15
Aggregate Unpaid Principal Balance - Assets		44
Difference - Assets		(29)
Loans \| Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	1,238	1,310
Aggregate Unpaid Principal Balance - Assets	1,469	1,568
Difference - Assets	(231)	(258)
Loans \| Accruing loans less than 90 days past due \| Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	507	509
Aggregate Unpaid Principal Balance - Assets	520	521
Difference - Assets	(13)	(12)
Loans \| Accruing loans 90 days or more past due \| Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	146	155
Aggregate Unpaid Principal Balance - Assets	156	167
Difference - Assets	(10)	(12)
Loans \| Nonaccrual loans \| Residential Mortgages
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	585	646
Aggregate Unpaid Principal Balance - Assets	793	880
Difference - Assets	(208)	(234)
Other assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Assets	85	80
Aggregate Unpaid Principal Balance - Assets	69	80
Difference - Assets	16
Other borrowed funds
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Liabilities	39	31
Aggregate Unpaid Principal Balance - Liabilities	40	32
Difference - Liabilities	(1)	(1)
Other liabilities
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value - Liabilities	124	196
Aggregate Unpaid Principal Balance - Liabilities
Difference - Liabilities	$ 124	$ 196

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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