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Objectives and Strategies for Using Derivatives (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Foreign Exchange Contract | Not Designated as Hedging Instrument |  |  |
Aggregate notional value | $ 1,900 |  |
Gains (Losses) on undesignated foreign exchange hedging instruments | (17) | $ 52 | $ (37)
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |  |
Derivative Assets | 34 | 30 |
Derivative Liability | 44 | $ 18 |
Net Investment Hedging | Foreign Exchange Contract |  |  |
Aggregate notional value | 1,500 |  |
Fair Value Hedging | Interest Rate Contract |  |  |
Aggregate notional value | 300 |  |
Long-term Debt, Fair Value | 308 |  |
Cash Flow Hedging | Foreign Exchange Contract |  |  |
Aggregate notional value | $ 652 |  |

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