Derivatives and Hedging Activities (Details 1) - Fair Value Hedging [Member] - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Other Expense [Member] | Interest Rate Contracts [Member] | |||
| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Derivative contract | $ (83) | $ (143) | $ (370) |
| Hedged item | 93 | 148 | 351 |
| Net hedge ineffectiveness | 10 | 5 | (19) |
| Other Revenues [Member] | Total Return Swap [Member] | |||
| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Derivative contract | 0 | 11 | 15 |
| Hedged item | 0 | (11) | (15) |
| Net hedge ineffectiveness | $ 0 | $ 0 | $ 0 |