Derivative Instruments - Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) (Details) - Foreign Exchange Contract - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Impact of Designated Derivative Instruments on Accumulated Other Comprehensive Income
Foreign exchange contracts designated as cash flow hedges, beginning balance	$ (111)	$ 131
Amount of gains (losses) recognized in other comprehensive income	183	(200)
Less: Amount of gains (losses) reclassified from accumulated other comprehensive income to net revenue	(66)	46
Foreign exchange contracts designated as cash flow hedges, ending balance	$ 138	$ (115)

Impact Of Designated Derivative Instruments On Accumulated Other Comprehensive Income [Roll Forward]

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- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section 45
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- Definition

Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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