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Objectives And Strategies For Using Derivatives (Narratives) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Gain (loss) on undesignated foreign exchange hedging instruments | $ (40,000,000) | $ 19,000,000 | $ (37,000,000) | $ 16,000,000 |
Foreign currency exchange contracts | Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Aggregate notional values of outstanding derivatives | 2,300,000,000 |  | 2,300,000,000 |  |
Net Investment Hedging |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Aggregate notional values of outstanding derivatives | 808,000,000 |  | $ 808,000,000 |  |
Fair Value Hedging |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Fair value hedge ineffectiveness assertion |  |  | Fair value hedges resulted in no significant ineffectiveness in the six months ended June 30, 2018 and 2017 |  |
Gain (loss) recognized in earnings as a result of hedge not qualifying as a fair value hedge |  |  | $ 0 | $ 0 |
Fair Value Hedging | Interest Rate Contract |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Aggregate notional values of outstanding derivatives | 300,000,000 |  | $ 300,000,000 |  |
Cash Flow Hedging |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Cash flow hedge ineffectiveness assertion |  |  | Cash flow hedges resulted in no significant ineffectiveness for the six months ended June 30, 2018 and 2017 |  |
Maximum Maturity Date |  |  | Jun. 30, 2020 |  |
Cash Flow Hedging | Interest Rate Contract |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Aggregate notional values of outstanding derivatives | 100,000,000 |  | $ 100,000,000 |  |
Cash Flow Hedging | Foreign currency exchange contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Aggregate notional values of outstanding derivatives | 699,000,000 |  | 699,000,000 |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |  |
Derivative Asset | 39,000,000 |  | 39,000,000 |  | $ 27,000,000
Derivative Liability | $ 63,000,000 |  | $ 63,000,000 |  | $ 51,000,000

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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