Credit Quality And Allowance For Credit Losses (Individually Evaluated Impaired Loans) (Details) - USD ($)
$ in Millions |
Mar. 31, 2018 |
Dec. 31, 2017 |
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Recorded investment in impaired loans with no related allowance |
|
$ 227
|
$ 173
|
| Recorded investment in impaired loans with related allowance |
|
188
|
304
|
| Recorded investment total impaired loans |
|
415
|
477
|
| Unpaid principal balance |
|
525
|
593
|
| Related allowance for loan losses |
|
42
|
67
|
| Business loans | Commercial borrower |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Recorded investment in impaired loans with no related allowance |
|
204
|
147
|
| Recorded investment in impaired loans with related allowance |
|
180
|
296
|
| Recorded investment total impaired loans |
|
384
|
443
|
| Unpaid principal balance |
|
490
|
555
|
| Related allowance for loan losses |
|
42
|
67
|
| Business loans | Commercial borrower | Domestic loans |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Recorded investment in impaired loans with no related allowance |
|
159
|
105
|
| Recorded investment in impaired loans with related allowance |
|
156
|
267
|
| Recorded investment total impaired loans |
|
315
|
372
|
| Unpaid principal balance |
|
403
|
460
|
| Related allowance for loan losses |
|
39
|
63
|
| Business loans | Commercial borrower | International loans |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Recorded investment in impaired loans with no related allowance |
|
3
|
0
|
| Recorded investment in impaired loans with related allowance |
|
1
|
6
|
| Recorded investment total impaired loans |
|
4
|
6
|
| Unpaid principal balance |
|
9
|
17
|
| Related allowance for loan losses |
|
0
|
1
|
| Business loans | Real estate mortgage | Commercial borrower | Domestic loans |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Recorded investment in impaired loans with no related allowance |
|
42
|
42
|
| Recorded investment in impaired loans with related allowance |
|
23
|
23
|
| Recorded investment total impaired loans |
|
65
|
65
|
| Unpaid principal balance |
|
78
|
78
|
| Related allowance for loan losses |
|
3
|
3
|
| Business loans | Real estate mortgage | Commercial borrower | Domestic loans | Commercial Real Estate business line |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Recorded investment in impaired loans with no related allowance |
[1] |
39
|
39
|
| Recorded investment in impaired loans with related allowance |
[1] |
1
|
1
|
| Recorded investment total impaired loans |
[1] |
40
|
40
|
| Unpaid principal balance |
[1] |
49
|
49
|
| Related allowance for loan losses |
[1] |
0
|
0
|
| Business loans | Real estate mortgage | Commercial borrower | Domestic loans | Other business lines |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Recorded investment in impaired loans with no related allowance |
[2] |
3
|
3
|
| Recorded investment in impaired loans with related allowance |
[2] |
22
|
22
|
| Recorded investment total impaired loans |
[2] |
25
|
25
|
| Unpaid principal balance |
[2] |
29
|
29
|
| Related allowance for loan losses |
[2] |
3
|
3
|
| Retail loans |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Recorded investment in impaired loans with no related allowance |
[3] |
23
|
26
|
| Recorded investment in impaired loans with related allowance |
[3] |
8
|
8
|
| Recorded investment total impaired loans |
[3] |
31
|
34
|
| Unpaid principal balance |
[3] |
35
|
38
|
| Related allowance for loan losses |
[3] |
0
|
0
|
| Retail loans | Consumer borrower |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Recorded investment in impaired loans with no related allowance |
|
12
|
12
|
| Recorded investment in impaired loans with related allowance |
|
0
|
0
|
| Recorded investment total impaired loans |
|
12
|
12
|
| Unpaid principal balance |
|
15
|
16
|
| Related allowance for loan losses |
|
0
|
0
|
| Retail loans | Real estate mortgage |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Recorded investment in impaired loans with no related allowance |
|
11
|
14
|
| Recorded investment in impaired loans with related allowance |
|
8
|
8
|
| Recorded investment total impaired loans |
|
19
|
22
|
| Unpaid principal balance |
|
20
|
22
|
| Related allowance for loan losses |
|
0
|
0
|
| Retail loans | Home equity | Consumer borrower |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Recorded investment in impaired loans with no related allowance |
|
11
|
11
|
| Recorded investment in impaired loans with related allowance |
|
0
|
0
|
| Recorded investment total impaired loans |
|
11
|
11
|
| Unpaid principal balance |
|
13
|
14
|
| Related allowance for loan losses |
|
0
|
0
|
| Retail loans | Other consumer | Consumer borrower |
|
|
|
| Financing Receivable, Impaired [Line Items] |
|
|
|
| Recorded investment in impaired loans with no related allowance |
|
1
|
1
|
| Recorded investment in impaired loans with related allowance |
|
0
|
0
|
| Recorded investment total impaired loans |
|
1
|
1
|
| Unpaid principal balance |
|
2
|
2
|
| Related allowance for loan losses |
|
$ 0
|
$ 0
|
|
|