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Derivatives and Hedging Activities (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Derivatives, Fair Value [Line Items] |  |
Total fair value of derivative assets | $ 255 | $ 514
Total fair value of derivative liabilities | 362 | 214
Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset and liability netting | (105) | (90)
Total derivatives assets, net | 104 | 396
Cash collateral netting, Assets | (46) | (28)
Other Assets [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivative assets | 108 | 256
Other Assets [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total derivatives assets, net | 66 | 34
Other Assets [Member] | Foreign exchange contracts [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total derivatives assets, net | 42 | 222
Other Assets [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivative assets | 147 | 258
Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset and liability netting | (105) | (90)
Total derivative liabilities, net | 222 | 46
Cash collateral netting, Liabilities | (35) | (78)
Other Liabilities [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivative liabilities | 177 | 135
Other Liabilities [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total derivative liabilities, net | 39 | 74
Other Liabilities [Member] | Foreign exchange contracts [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total derivative liabilities, net | 138 | 61
Other Liabilities [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivative liabilities | $ 185 | $ 79

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