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Derivative Financial Instruments (Effect of Deriative Instruments on Income Statement and Statement of Comprehensive Income) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Derivative Financial Instruments
Amount of gain (loss) recognized in OCI		$ 0	$ (2)
Amount of gain reclassified from OCI into revenue		(1,217)
Reclassification out of Accumulated Other Comprehensive Income | Foreign Exchange Contract
Derivative Financial Instruments
Amount of gain reclassified from OCI into revenue	[1]	(1)	0
Amount of (gain) loss reclassified from OCI into cost of revenue	[1]	0	1
Cash Flow Hedging [Member] | Foreign Exchange Contract
Derivative Financial Instruments
Amount of gain (loss) recognized in OCI	[1]	0	2
Cash Flow Hedging [Member] | Cross Currency Swaps
Derivative Financial Instruments
Amount of gain (loss) recognized in OCI	[1]	(23)	(8)
Cash Flow Hedging [Member] | Foreign Currency Denominated Debt
Derivative Financial Instruments
Amount of gain (loss) recognized in OCI	[1]	$ (23)	$ (14)
[1] Effective portion

X

- Definition

Total costs related to goods produced and sold during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

Amount of net unrealized gain (loss) related to the change in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments. Recorded in accumulated other comprehensive income to the extent that the cash flow hedge is determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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- Definition

Derivative instruments gains losses in statement of financial performance.

+ References

No definition available.

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