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Derivative Instruments (Forward Currency Exchange Contracts) (Details) - Foreign Exchange Contract - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Notional Amount	$ 5,186	$ 5,871
Maximum Term (Days)	547 days	548 days
Derivative, Fair Value, Net	$ (65)	$ (21)
Other current assets
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	14	15
Other noncurrent assets
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	1	1
Other current liabilities
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	(79)	(36)
Other noncurrent liabilities
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	(1)	(1)
Designated
Derivative [Line Items]
Notional Amount	833	1,104
Derivative, Fair Value, Net	1	4
Designated | Other current assets
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	9	11
Designated | Other noncurrent assets
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	1	1
Designated | Other current liabilities
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	(8)	(7)
Designated | Other noncurrent liabilities
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	(1)	(1)
Non-Designated
Derivative [Line Items]
Notional Amount	4,353	4,767
Derivative, Fair Value, Net	(66)	(25)
Non-Designated | Other current assets
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	5	4
Non-Designated | Other noncurrent assets
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Non-Designated | Other current liabilities
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	(71)	(29)
Non-Designated | Other noncurrent liabilities
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 0	$ 0

X

- 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

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 3
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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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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.

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