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Derivative Instruments (Forward Currency Exchange Contracts) (Details) - Foreign Exchange Contract - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |
Notional Amount | $ 5,439 | $ 5,871
Maximum term in days | 586 days | 548 days
Derivative, Fair Value, Net | $ 22 | $ (21)
Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 38 | 15
Other noncurrent assets |  |
Derivative [Line Items] |  |
Derivative assets | 2 | 1
Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | (18) | (36)
Other noncurrent liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities |  | (1)
Designated |  |
Derivative [Line Items] |  |
Notional Amount | 828 | 1,104
Derivative, Fair Value, Net | 14 | 4
Designated | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 16 | 11
Designated | Other noncurrent assets |  |
Derivative [Line Items] |  |
Derivative assets | 1 | 1
Designated | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | (3) | (7)
Designated | Other noncurrent liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities |  | (1)
Non-Designated |  |
Derivative [Line Items] |  |
Notional Amount | 4,611 | 4,767
Derivative, Fair Value, Net | 8 | (25)
Non-Designated | Other current assets |  |
Derivative [Line Items] |  |
Derivative assets | 22 | 4
Non-Designated | Other noncurrent assets |  |
Derivative [Line Items] |  |
Derivative assets | 1 | 0
Non-Designated | Other current liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities | $ (15) | (29)
Non-Designated | Other noncurrent liabilities |  |
Derivative [Line Items] |  |
Derivative liabilities |  | $ 0

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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, before 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 elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109247956&loc=SL51823488-111719 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition Maximum amount of time remaining before foreign currency exchange rate derivatives mature or expire, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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