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Derivatives and Hedging Activities (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivative assets | $ 327 | $ 210
Total fair value of derivative liabilities | 402 | 218
Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset and liability netting | (122) | (80)
Total derivatives assets, net | 183 | 124
Cash collateral netting, Assets | (22) | (6)
Other Assets [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivative assets | 247 | 128
Other Assets [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total derivatives assets, net | 0 | 11
Other Assets [Member] | Foreign exchange contracts [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total derivatives assets, net | 247 | 117
Other Assets [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivative assets | 80 | 82
Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset and liability netting | (122) | (80)
Total derivative liabilities, net | 100 | 93
Cash collateral netting, Liabilities | (180) | (45)
Other Liabilities [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivative liabilities | 265 | 123
Other Liabilities [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total derivative liabilities, net | 180 | 34
Other Liabilities [Member] | Foreign exchange contracts [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total derivative liabilities, net | 85 | 89
Other Liabilities [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total fair value of derivative liabilities | $ 137 | 95
Individually Significant Counterparties [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total derivatives assets, net |  | 0
Total derivative liabilities, net |  | $ 0

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