Goodwill and Intangible Assets By Reportable Segment (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Goodwill
Goodwill, beginning balance	$ 9,267us-gaap_Goodwill	$ 8,537us-gaap_Goodwill
Goodwill Acquired	30us-gaap_GoodwillAcquiredDuringPeriod	714us-gaap_GoodwillAcquiredDuringPeriod
Adjustments/Allocations	(203)	16
Goodwill, ending balance	9,094us-gaap_Goodwill	9,267us-gaap_Goodwill
Marketplaces [Member]
Goodwill
Goodwill, beginning balance	4,861	4,732
Goodwill Acquired	30	112
Adjustments/Allocations	(213)	17
Goodwill, ending balance	4,678	4,861
Payments [Member]
Goodwill
Goodwill, beginning balance	3,120	2,519
Goodwill Acquired	0	602
Adjustments/Allocations	10	(1)
Goodwill, ending balance	3,130	3,120
Enterprise [Member]
Goodwill
Goodwill, beginning balance	1,286	1,286
Goodwill Acquired	0	0
Adjustments/Allocations	0	0
Goodwill, ending balance	$ 1,286	$ 1,286

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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