|
Investment Securities (Details Textuals) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Dec. 31, 2012
|
|
| Investment Securities (Details) [Abstract] | |||||
| Other-than-temporary impairments recognized during the period | $ 0 | $ 0 | |||
| Gain on sale of securities | 37 | 35 | 102 | 85 | |
| Losses on sale of securities | $ 0 | $ 0 | $ 0 | $ 1 | |