|
Reserves For Losses (Details 3) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Card Member Loans And Related Reserves Evaluated Separately And Collectively For Impairment [Abstract] | ||
| Card Member loans evaluated individually for impairment | $ 305 | $ 286 |
| Reserves on Card Member loans evaluated individually for impairment | 65 | 67 |
| Card Member loans evaluated collectively for impairment | 66,530 | 70,099 |
| Reserves on Card Member loans evaluated collectively for impairment | $ 1,065 | $ 1,134 |