|
Significant Credit Concentrations (Details) (USD $)
In Billions, unless otherwise specified |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| Maximum Credit Exposure by Category | ||
| On-balance sheet | $ 147 | $ 141 |
| Individuals [Member] | ||
| Maximum Credit Exposure by Category | ||
| On-balance sheet | 101 | 98 |
| Unused lines-of-credit | 278 | 265 |
| Financial Institutions [Member] | ||
| Maximum Credit Exposure by Category | ||
| On-balance sheet | 25 | 22 |
| United States Government And Agencies [Member] | ||
| Maximum Credit Exposure by Category | ||
| On-balance sheet | 4 | 4 |
| Other Concentration [Member] | ||
| Maximum Credit Exposure by Category | ||
| On-balance sheet | $ 17 | $ 17 |