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Financing Arrangements and Derivative Financial Instruments - Fair Values for Foreign Currency Contracts (Details) - USD ($) $ in Millions | 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 and Hedging Activities Disclosures |  |  |  |  |
Foreign currency derivatives, notional amount | $ 1,928 |  | $ 1,928 |  | $ 1,409
Foreign currency derivatives, net transaction gains (losses) | 43 | $ (41) | 45 | $ (45) |
Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures |  |  |  |  |
Foreign currency derivatives, notional amount | 263 |  | 263 |  | 250
Accounts receivable |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures |  |  |  |  |
Fair value - asset, not designated as hedging instruments | 26 |  | 26 |  | 3
Fair value - asset, designated as hedging instruments | 5 |  | 5 |  | 1
Other current liabilities |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures |  |  |  |  |
Fair value - liability, not designated as hedging instruments | (5) |  | (5) |  | (9)
Fair value - liability, designated as hedging instruments | (2) |  | (2) |  | (8)
Other assets |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures |  |  |  |  |
Fair value - asset, designated as hedging instruments | 2 |  | 2 |  | 0
Other long term liabilities |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures |  |  |  |  |
Fair value - liability, designated as hedging instruments | $ 0 |  | $ 0 |  | $ (2)

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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 as of the balance sheet date of all foreign currency derivative assets designated as cash flow hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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