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Derivative Financial Instruments - Derivative Instruments and their Balance Sheet Classifications (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 33	$ 62
Derivative Liabilities	11	77
Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	21	30
Derivative Liabilities	5	48
Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	12	32
Derivative Liabilities	6	29
Foreign Exchange Contracts [Member] | Prepaid and Other Current Assets [Member] | Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	13	24
Foreign Exchange Contracts [Member] | Prepaid and Other Current Assets [Member] | Designated as Hedging Instruments [Member] | Accrued liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	3	37
Foreign Exchange Contracts [Member] | Prepaid and Other Current Assets [Member] | Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	10	32
Foreign Exchange Contracts [Member] | Prepaid and Other Current Assets [Member] | Not Designated as Hedging Instruments [Member] | Accrued liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	5	29
Foreign Exchange Contracts [Member] | Other Liabilities [Member] | Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	2	11
Foreign Exchange Contracts [Member] | Other Liabilities [Member] | Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1
Foreign Exchange Contracts [Member] | Other Assets [Member] | Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	8	$ 6
Foreign Exchange Contracts [Member] | Other Assets [Member] | Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 2

X

- 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://www.xbrl.org/2003/role/presentationRef
-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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719

+ Details

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X

- Definition

Fair value, before effects of master netting arrangements, of a financial liability or 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 liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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