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

Dec. 31, 2021

Dec. 31, 2020

Financing Receivable, Impaired [Line Items]

Nonaccrual loans with no related allowance

$ 60

$ 127

Nonaccrual loans with related allowance

204

220

Nonaccrual loans

264

347

Business loans | Commercial borrower

Financing Receivable, Impaired [Line Items]

Nonaccrual loans with no related allowance

12

63

Nonaccrual loans with related allowance

204

220

Nonaccrual loans

216

283

Business loans | Commercial borrower | Domestic loans

Financing Receivable, Impaired [Line Items]

Nonaccrual loans with no related allowance

8

57

Nonaccrual loans with related allowance

165

195

Nonaccrual loans

173

252

Business loans | Commercial borrower | Non-US

Financing Receivable, Impaired [Line Items]

Nonaccrual loans with no related allowance

0

Nonaccrual loans with related allowance

5

Nonaccrual loans

5

Retail loans

Financing Receivable, Impaired [Line Items]

Nonaccrual loans with no related allowance

48

64

Nonaccrual loans with related allowance

0

0

Nonaccrual loans

48

64

Retail loans | Home equity

Financing Receivable, Impaired [Line Items]

Nonaccrual loans

12

17

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

Financing Receivable, Impaired [Line Items]

Nonaccrual loans

6

1

Real estate construction | Commercial Real Estate business line | Business loans | Commercial borrower | Domestic loans

Financing Receivable, Impaired [Line Items]

Nonaccrual loans

^[1]

0

0

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

Financing Receivable, Impaired [Line Items]

Nonaccrual loans with no related allowance

^[2]

0

0

Nonaccrual loans with related allowance

^[2]

6

1

Nonaccrual loans

^[2]

6

1

Commercial mortgage | Business loans | Commercial borrower | Domestic loans

Financing Receivable, Impaired [Line Items]

Nonaccrual loans with no related allowance

4

6

Nonaccrual loans with related allowance

28

23

Nonaccrual loans

32

29

Commercial mortgage | Commercial Real Estate business line | Business loans | Commercial borrower | Domestic loans

Financing Receivable, Impaired [Line Items]

Nonaccrual loans with no related allowance

^[1]

0

1

Nonaccrual loans with related allowance

^[1]

1

2

Nonaccrual loans

^[1]

1

3

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

Financing Receivable, Impaired [Line Items]

Nonaccrual loans with no related allowance

^[2]

4

5

Nonaccrual loans with related allowance

^[2]

27

21

Nonaccrual loans

^[2]

31

26

Residential mortgage | Retail loans

Financing Receivable, Impaired [Line Items]

Nonaccrual loans with no related allowance

36

47

Nonaccrual loans with related allowance

0

0

Nonaccrual loans

36

47

Home equity | Retail loans | Home equity

Financing Receivable, Impaired [Line Items]

Nonaccrual loans with no related allowance

12

17

Nonaccrual loans with related allowance

0

0

Nonaccrual loans

12

17

Other consumer | Retail loans | Home equity

Financing Receivable, Impaired [Line Items]

Nonaccrual loans

$ 0

0

Business Loans | Lease financing | Commercial borrower | Domestic loans

Financing Receivable, Impaired [Line Items]

Nonaccrual loans with no related allowance

0

Nonaccrual loans with related allowance

1

Nonaccrual loans

$ 1

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

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+ References

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Amount of financing receivable on nonaccrual status with no allowance for credit loss.

+ 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 http://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

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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 http://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 http://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
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524

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