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Objectives and Strategies for Using Derivatives (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended | 36 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
Net Investment Hedging |  |  |  |
Aggregate notional value | $ 870 |  |  | $ 870
Fair Value Hedging |  |  |  |
Fair value hedge ineffectiveness is immaterial assertion |  |  |  | Fair value hedges resulted in no significant ineffectiveness in each of the three years ended December 31, 2017
Gains or losses from hedged firm commitment not qualifying as fair value hedge |  |  |  | $ 0
Cash Flow Hedging |  |  |  |
Cash flow hedge ineffectiveness is immaterial assertion |  |  |  | Cash flow hedges resulted in no significant ineffectiveness in each of the three years ended December 31, 2017
Gains or losses reclassified into earnings resulting from discontinuance of cash flow hedges |  |  |  | $ 0
Maximum maturity of cash flow hedges | Jan. 31, 2020 |  |  |
Foreign Exchange Contract | Cash Flow Hedging |  |  |  |
Aggregate notional value | $ 795 |  |  | 795
Foreign Exchange Contract | Not Designated as Hedging Instrument |  |  |  |
Aggregate notional value | 2,400 |  |  | 2,400
Gains (Losses) on undesignated foreign exchange hedging instruments | 37 | $ (30) | $ (188) |
Interest Rate Contract | Fair Value Hedging |  |  |  |
Aggregate notional value | 300 |  |  | 300
Interest Rate Contract | Cash Flow Hedging |  |  |  |
Aggregate notional value | 200 |  |  | 200
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |  |  |
Derivative Asset | 27 | 43 |  | 27
Derivative Liability | $ 51 | $ 46 |  | $ 51

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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=73719730&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=73719730&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=51825145&loc=SL20226008-175313 + Details
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