Credit Quality And Allowance For Credit Losses (Average Individually Evaluated Impaired Loans And Related Interest Recognized) (Details) - USD ($)
$ in Millions |
3 Months Ended |
Mar. 31, 2018 |
Mar. 31, 2017 |
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Individually Evaluated Impaired Loans Average Balance for the Period |
|
$ 446
|
$ 595
|
| Individually Evaluated Impaired Loans Interest Income Recognized for the Period |
|
2
|
2
|
| Business loans | Commercial borrower |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Individually Evaluated Impaired Loans Average Balance for the Period |
|
414
|
550
|
| Individually Evaluated Impaired Loans Interest Income Recognized for the Period |
|
2
|
2
|
| Business loans | Commercial borrower | Domestic loans |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Individually Evaluated Impaired Loans Average Balance for the Period |
|
344
|
498
|
| Individually Evaluated Impaired Loans Interest Income Recognized for the Period |
|
1
|
2
|
| Business loans | Commercial borrower | International loans |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Individually Evaluated Impaired Loans Average Balance for the Period |
|
5
|
11
|
| Individually Evaluated Impaired Loans Interest Income Recognized for the Period |
|
0
|
0
|
| Business loans | Real estate mortgage | Commercial borrower | Domestic loans |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Individually Evaluated Impaired Loans Average Balance for the Period |
|
65
|
41
|
| Individually Evaluated Impaired Loans Interest Income Recognized for the Period |
|
1
|
0
|
| Business loans | Real estate mortgage | Commercial borrower | Domestic loans | Commercial Real Estate business line |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Individually Evaluated Impaired Loans Average Balance for the Period |
[1] |
40
|
7
|
| Individually Evaluated Impaired Loans Interest Income Recognized for the Period |
[1] |
1
|
0
|
| Business loans | Real estate mortgage | Commercial borrower | Domestic loans | Other business lines |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Individually Evaluated Impaired Loans Average Balance for the Period |
[2] |
25
|
34
|
| Individually Evaluated Impaired Loans Interest Income Recognized for the Period |
[2] |
0
|
0
|
| Retail loans |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Individually Evaluated Impaired Loans Average Balance for the Period |
|
32
|
45
|
| Individually Evaluated Impaired Loans Interest Income Recognized for the Period |
|
0
|
0
|
| Retail loans | Consumer borrower |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Individually Evaluated Impaired Loans Average Balance for the Period |
|
12
|
18
|
| Individually Evaluated Impaired Loans Interest Income Recognized for the Period |
|
0
|
0
|
| Retail loans | Real estate mortgage |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Individually Evaluated Impaired Loans Average Balance for the Period |
|
20
|
27
|
| Individually Evaluated Impaired Loans Interest Income Recognized for the Period |
|
0
|
0
|
| Retail loans | Home equity | Consumer borrower |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Individually Evaluated Impaired Loans Average Balance for the Period |
|
11
|
14
|
| Individually Evaluated Impaired Loans Interest Income Recognized for the Period |
|
0
|
0
|
| Retail loans | Other consumer | Consumer borrower |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Individually Evaluated Impaired Loans Average Balance for the Period |
|
1
|
4
|
| Individually Evaluated Impaired Loans Interest Income Recognized for the Period |
|
$ 0
|
$ 0
|
|
|