Financial Instruments (Free-standing derivatives) (Details) - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
|
| Free standing derivatives | ||
| Gain (loss) on derivatives | $ (603) | |
| Free Standing Derivatives [Member] | ||
| Free standing derivatives | ||
| Gain (loss) on derivatives | $ (2,585) | |
| Interest Rate Contract | ||
| Free standing derivatives | ||
| Gain (loss) on derivatives | (101) | |
| Interest Rate Contract | Free Standing Derivatives [Member] | ||
| Free standing derivatives | ||
| Gain (loss) on derivatives | (53) | |
| Foreign Exchange Contract | ||
| Free standing derivatives | ||
| Gain (loss) on derivatives | (2,486) | |
| Foreign Exchange Contract | Free Standing Derivatives [Member] | ||
| Free standing derivatives | ||
| Gain (loss) on derivatives | (553) | |
| Other Contract [Member] | ||
| Free standing derivatives | ||
| Gain (loss) on derivatives | $ 2 | $ 3 |