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Asset Quality - Schedule of Modifications for Borrowers Experiencing Financial Difficulty (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 295
Percentage of Amortized Cost Basis	0.26%
Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 2
Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	186
Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	53
Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	54
Total commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 269
Percentage of Amortized Cost Basis	0.35%
Total commercial loans | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0
Total commercial loans | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	184
Total commercial loans | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	51
Total commercial loans | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	34
Total commercial loans | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 263
Percentage of Amortized Cost Basis	0.47%
Total commercial loans | Commercial and Industrial | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0
Total commercial loans | Commercial and Industrial | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	180
Total commercial loans | Commercial and Industrial | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	49
Total commercial loans | Commercial and Industrial | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	34
Total commercial loans | Commercial mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 6
Percentage of Amortized Cost Basis	0.04%
Total commercial loans | Commercial mortgage | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0
Total commercial loans | Commercial mortgage | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	4
Total commercial loans | Commercial mortgage | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	2
Total commercial loans | Commercial mortgage | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0
Total commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0
Percentage of Amortized Cost Basis	0.00%
Total commercial loans | Construction | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0
Total commercial loans | Construction | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0
Total commercial loans | Construction | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0
Total commercial loans | Construction | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0
Total commercial loans | Total commercial real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 6
Percentage of Amortized Cost Basis	0.03%
Total commercial loans | Total commercial real estate loans | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0
Total commercial loans | Total commercial real estate loans | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	4
Total commercial loans | Total commercial real estate loans | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	2
Total commercial loans | Total commercial real estate loans | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0
Total commercial loans | Commercial lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0
Percentage of Amortized Cost Basis	0.00%
Total commercial loans | Commercial lease financing | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0
Total commercial loans | Commercial lease financing | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0
Total commercial loans | Commercial lease financing | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0
Total commercial loans | Commercial lease financing | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0
Total consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 26
Percentage of Amortized Cost Basis	0.07%
Total consumer loans | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 2
Total consumer loans | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	2
Total consumer loans | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	2
Total consumer loans | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	20
Total consumer loans | Real estate — residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 10
Percentage of Amortized Cost Basis	0.05%
Total consumer loans | Real estate — residential mortgage | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0
Total consumer loans | Real estate — residential mortgage | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0
Total consumer loans | Real estate — residential mortgage | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	1
Total consumer loans | Real estate — residential mortgage | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	9
Total consumer loans | Home equity loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 9
Percentage of Amortized Cost Basis	0.13%
Total consumer loans | Home equity loans | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 2
Total consumer loans | Home equity loans | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	1
Total consumer loans | Home equity loans | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	1
Total consumer loans | Home equity loans | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	5
Total consumer loans | Consumer direct loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 3
Percentage of Amortized Cost Basis	0.05%
Total consumer loans | Consumer direct loans | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0
Total consumer loans | Consumer direct loans | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	1
Total consumer loans | Consumer direct loans | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0
Total consumer loans | Consumer direct loans | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	2
Total consumer loans | Commercial credit card
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 4
Percentage of Amortized Cost Basis	0.40%
Total consumer loans | Commercial credit card | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0
Total consumer loans | Commercial credit card | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0
Total consumer loans | Commercial credit card | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0
Total consumer loans | Commercial credit card | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	4
Total consumer loans | Consumer indirect loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0
Percentage of Amortized Cost Basis	0.00%
Total consumer loans | Consumer indirect loans | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0
Total consumer loans | Consumer indirect loans | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0
Total consumer loans | Consumer indirect loans | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0
Total consumer loans | Consumer indirect loans | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0

X

- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

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X

- Definition

Percentage, excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479294/326-20-55-79

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