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Objectives And Strategies For Using Derivatives (Narratives) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (loss) on undesignated foreign exchange hedging instruments | $ 3,000,000 | $ (3,000,000) |
Foreign currency exchange contracts | Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Aggregate notional values of outstanding derivatives | 2,300,000,000 |  |
Net Investment Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Aggregate notional values of outstanding derivatives | $ 1,000,000,000 |  |
Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Cash flow hedge ineffectiveness assertion | Cash flow hedges resulted in no significant ineffectiveness for the three months ended March 31, 2018 and 2017 |  |
Derivative, Maturity Date | Mar. 31, 2020 |  |
Cash Flow Hedging | Foreign currency exchange contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Aggregate notional values of outstanding derivatives | $ 764,000,000 |  |
Fair Value Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Fair value hedge ineffectiveness assertion | Fair value hedges resulted in no significant ineffectiveness in the three months ended March 31, 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 [Member] |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Aggregate notional values of outstanding derivatives | 300,000,000 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Derivative Asset | 30,000,000 |  | $ 27,000,000
Derivative Liability | $ 69,000,000 |  | $ 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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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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