Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions |
3 Months Ended |
|
Mar. 31, 2018 |
Mar. 31, 2017 |
Dec. 31, 2017 |
| Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
|
|
|
| Investment securities, Balance at beginning of period, net of tax |
$ (101)
|
$ (33)
|
|
| Cumulative effect of change in accounting principle |
1
|
0
|
|
| Investment securities, Net unrealized holding losses arising during the period |
(142)
|
(2)
|
|
| Investment securities, Less: Benefit for income taxes |
(33)
|
(1)
|
|
| Investment securities, Net unrealized holding losses arising during the period, net of tax |
(109)
|
(1)
|
|
| Investment securities, Reclassification adjustment for net losses realized as a yield adjustment included in net income, net of tax |
0
|
(1)
|
|
| Investment securities, Change in net unrealized losses on investment securities, net of tax |
(109)
|
0
|
|
| Investment securities, Balance at end of period, net of tax |
(209)
|
(33)
|
|
| Benefit plans, Balance at beginning of period, net of tax |
(350)
|
(350)
|
|
| Benefit plans, Amortization of actuarial net loss |
15
|
13
|
|
| Benefit plans, Amortization of prior service credit |
(7)
|
(7)
|
|
| Benefit plans, Amounts recognized in other noninterest expense |
8
|
6
|
|
| Benefit plans, Less: Provision for income taxes |
2
|
2
|
|
| Benefit plans, Change in defined benefit pension and other postretirement plans adjustment, net of tax |
6
|
4
|
|
| Benefit plans, Balance at end of period, net of tax |
(344)
|
(346)
|
|
| Total accumulated other comprehensive loss at end of period, net of tax |
$ (553)
|
$ (379)
|
$ (451)
|