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Derivatives and Hedging Activities (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
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Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives assets | $ 1,143 | $ 544
Total fair value of derivatives liabilties | 389 | 201
Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Cash collateral netting | (361) | (155)
Derivative asset and liability netting | (169) | (107)
Total derivative assets, net | 613 | 282
Other Assets [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives assets | 668 | 427
Other Assets [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives assets | 452 | 236
Other Assets [Member] | Foreign exchange contracts [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives assets | 216 | 191
Other Assets [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives assets | 475 | 117
Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Cash collateral netting | 0 | 0
Derivative asset and liability netting | (169) | (107)
Total derivative liabilities, net | 220 | 94
Other Liabilities [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives liabilties | 141 | 66
Other Liabilities [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives liabilties | 248 | 135
Other Liabilities [Member] | Fair Value Hedging [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives liabilties | 0 | 9
Other Liabilities [Member] | Net Investment Hedging [Member] | Foreign exchange contracts [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivatives liabilties | 141 | 57
Risk Exposure Low [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total derivative assets, net | 574 | 282
Total derivative liabilities, net |  | 0
Individually Significant Counterparties [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total derivative assets, net | 0 | 0
Total derivative liabilities, net | $ 0 | $ 0

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