Significant Credit Concentrations (Details 1) - USD ($) $ in Billions |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Card Member loans and receivables exposure | ||
| On-balance sheet | $ 113 | $ 118 |
| Individuals [Member] | ||
| Card Member loans and receivables exposure | ||
| Unused lines-of-credit | 242 | 297 |
| U.S. [Member] | ||
| Card Member loans and receivables exposure | ||
| On-balance sheet | 93 | 99 |
| U.S. [Member] | Individuals [Member] | ||
| Card Member loans and receivables exposure | ||
| Unused lines-of-credit | 203 | 259 |
| Non-U.S. [Member] | ||
| Card Member loans and receivables exposure | ||
| On-balance sheet | 20 | 19 |
| Non-U.S. [Member] | Individuals [Member] | ||
| Card Member loans and receivables exposure | ||
| Unused lines-of-credit | $ 39 | $ 38 |