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Credit Quality And Allowance For Credit Losses (Nonaccrual Loans) (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2024

Sep. 30, 2023

Sep. 30, 2024

Sep. 30, 2023

Dec. 31, 2023

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

$ 91

$ 91

$ 109

Nonaccrual Loans with Related Allowance

159

159

69

Total Nonaccrual Loans

250

250

178

Interest income

2

$ 2

8

$ 8

Business loans: | Commercial

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

30

30

69

Nonaccrual Loans with Related Allowance

159

159

69

Total Nonaccrual Loans

189

189

138

Business loans: | Commercial | Domestic

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

22

22

47

Nonaccrual Loans with Related Allowance

75

75

28

Total Nonaccrual Loans

97

97

75

Business loans: | Commercial | International

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

0

0

3

Nonaccrual Loans with Related Allowance

3

3

17

Total Nonaccrual Loans

3

3

20

Retail loans:

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

61

61

40

Nonaccrual Loans with Related Allowance

0

0

0

Total Nonaccrual Loans

61

61

40

Retail loans: | Consumer

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

21

Nonaccrual Loans with Related Allowance

0

Total Nonaccrual Loans

25

25

21

Real estate construction | Business loans: | Commercial | Domestic

Financing Receivable, Nonaccrual [Line Items]

Total Nonaccrual Loans

0

0

2

Real estate construction | Commercial | Business loans: | Commercial | Domestic

Financing Receivable, Nonaccrual [Line Items]

Total Nonaccrual Loans

^[1]

0

0

0

Real estate construction | Other business lines | Business loans: | Commercial | Domestic

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

^[2]

2

Nonaccrual Loans with Related Allowance

^[2]

0

Total Nonaccrual Loans

^[2]

0

0

2

Commercial mortgage: | Business loans: | Commercial | Domestic

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

8

8

17

Nonaccrual Loans with Related Allowance

80

80

24

Total Nonaccrual Loans

88

88

41

Commercial mortgage: | Commercial | Business loans: | Commercial | Domestic

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

^[1]

0

0

0

Nonaccrual Loans with Related Allowance

^[1]

18

18

18

Total Nonaccrual Loans

^[1]

18

18

18

Commercial mortgage: | Other business lines | Business loans: | Commercial | Domestic

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

^[2]

8

8

17

Nonaccrual Loans with Related Allowance

^[2]

62

62

6

Total Nonaccrual Loans

^[2]

70

70

23

Residential mortgage | Retail loans:

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

36

36

19

Nonaccrual Loans with Related Allowance

0

0

0

Total Nonaccrual Loans

36

36

19

Home equity | Retail loans: | Consumer

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

25

25

21

Nonaccrual Loans with Related Allowance

0

0

0

Total Nonaccrual Loans

25

25

21

Other consumer | Retail loans: | Consumer

Financing Receivable, Nonaccrual [Line Items]

Total Nonaccrual Loans

0

0

0

Lease financing | Business loans: | Commercial | Domestic

Financing Receivable, Nonaccrual [Line Items]

Total Nonaccrual Loans

1

1

$ 0

Lease financing | Lease financing | Business loans: | Commercial | Domestic

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

0

0

Nonaccrual Loans with Related Allowance

1

1

Total Nonaccrual Loans

$ 1

$ 1

[1]	Primarily loans to real estate developers.
[2]	Primarily loans secured by owner-occupied real estate.

X

- Definition

Amount of interest income on financing receivable on nonaccrual status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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-Section 50
-Paragraph 7
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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