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

3 Months Ended

Mar. 31, 2023

Mar. 31, 2022

Dec. 31, 2022

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

$ 138

$ 140

Nonaccrual Loans with Related Allowance

83

100

Total Nonaccrual Loans

221

240

Interest income

4

$ 2

Business loans: | Commercial

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

84

71

Nonaccrual Loans with Related Allowance

80

100

Total Nonaccrual Loans

164

171

Business loans: | Commercial | Domestic

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

79

64

Nonaccrual Loans with Related Allowance

55

78

Total Nonaccrual Loans

134

142

Business loans: | Commercial | International

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

3

3

Nonaccrual Loans with Related Allowance

0

0

Total Nonaccrual Loans

3

3

Business loans: | Commercial | International

Financing Receivable, Nonaccrual [Line Items]

Total Nonaccrual Loans

3

3

Retail loans:

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

54

69

Nonaccrual Loans with Related Allowance

3

0

Total Nonaccrual Loans

57

69

Retail loans: | Consumer

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

16

Nonaccrual Loans with Related Allowance

0

Total Nonaccrual Loans

18

16

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

Financing Receivable, Nonaccrual [Line Items]

Total Nonaccrual Loans

3

3

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

Financing Receivable, Nonaccrual [Line Items]

Total Nonaccrual Loans

^[1]

0

0

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

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

^[2]

0

0

Nonaccrual Loans with Related Allowance

^[2]

3

3

Total Nonaccrual Loans

^[2]

3

3

Commercial mortgage: | Business loans: | Commercial | Domestic

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

2

4

Nonaccrual Loans with Related Allowance

22

19

Total Nonaccrual Loans

24

23

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

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

^[1]

0

0

Nonaccrual Loans with Related Allowance

^[1]

1

1

Total Nonaccrual Loans

^[1]

1

1

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

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

^[2]

2

4

Nonaccrual Loans with Related Allowance

^[2]

21

18

Total Nonaccrual Loans

^[2]

23

22

Residential mortgage | Retail loans:

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

36

53

Nonaccrual Loans with Related Allowance

3

0

Total Nonaccrual Loans

39

53

Home equity | Retail loans: | Consumer

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

18

15

Nonaccrual Loans with Related Allowance

0

0

Total Nonaccrual Loans

18

15

Other consumer | Retail loans: | Consumer

Financing Receivable, Nonaccrual [Line Items]

Nonaccrual Loans with No Related Allowance

1

Nonaccrual Loans with Related Allowance

0

Total Nonaccrual Loans

0

1

Lease financing | Business loans: | Commercial | Domestic

Financing Receivable, Nonaccrual [Line Items]

Total Nonaccrual Loans

$ 0

$ 0

[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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

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+ References

No definition available.

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (3)

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (2)

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524

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