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Derivatives and Hedging Activities (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives assets | $ 922 | $ 991
Total fair value of derivatives liabilties | 218 | 164
Other Assets [Member] |  |
Derivative [Line Items] |  |
Total derivative assets, net | 485 | 711
Derivatives, Fair Value [Line Items] |  |
Cash collateral netting | (307) | (158)
Derivative asset and liability netting | (130) | (122)
Total derivative assets, net | 485 | 711
Other Assets [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives assets | 776 | 806
Other Assets [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives assets | 146 | 185
Other Liabilities [Member] |  |
Derivative [Line Items] |  |
Total derivative liabilities, net | 88 | 38
Derivatives, Fair Value [Line Items] |  |
Cash collateral netting | 0 | (4)
Derivative asset and liability netting | (130) | (122)
Total derivative liabilities, net | 88 | 38
Other Liabilities [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives liabilties | 102 | 50
Other Liabilities [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives liabilties | 116 | 114
Fair Value Hedging [Member] | Other Assets [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives assets | 391 | 314
Fair Value Hedging [Member] | Other Liabilities [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives liabilties | 0 | 4
Net Investment Hedging [Member] | Other Assets [Member] | Foreign exchange contracts [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives assets | 385 | 492
Net Investment Hedging [Member] | Other Liabilities [Member] | Foreign exchange contracts [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives liabilties | 102 | 46
Risk Exposure Low [Member] |  |
Derivative [Line Items] |  |
Total derivative assets, net | 0 |
Total derivative liabilities, net | 0 | 0
Derivatives, Fair Value [Line Items] |  |
Total derivative assets, net | 0 |
Total derivative liabilities, net | 0 | 0
Individually Significant Counterparties [Member] |  |
Derivative [Line Items] |  |
Total derivative assets, net | 0 | 0
Total derivative liabilities, net | 0 | 0
Derivatives, Fair Value [Line Items] |  |
Total derivative assets, net | 0 | 0
Total derivative liabilities, net | $ 0 | $ 0

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