Segments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014 segments		Sep. 30, 2013
Financial performance of operating segments
Number of reportable segments					3
Total consolidated net revenue	$ 4,353		$ 3,892		$ 12,981		$ 11,517
Operating income (loss)	781		799		2,453		2,349
Marketplaces
Financial performance of operating segments
Net transaction revenues	1,707		1,609		5,156		4,741
Marketing services and other revenues	449		418		1,329		1,244
Revenue by reportable segment	2,156		2,027		6,485		5,985
Operating income (loss)	775		789		2,419		2,406
Payments
Financial performance of operating segments
Net transaction revenues	1,783		1,493		5,224		4,403
Marketing services and other revenues	167		127		517		389
Revenue by reportable segment	1,950		1,620		5,741		4,792
Operating income (loss)	407		368		1,360		1,116
Enterprise
Financial performance of operating segments
Net transaction revenues	199		185		614		565
Marketing services and other revenues	60		67		181		195
Revenue by reportable segment	259		252		795		760
Operating income (loss)	0		8		16		9
Corporate and other
Financial performance of operating segments
Operating income (loss)	(401)		(366)		(1,342)		(1,182)
Intersegment Eliminations
Financial performance of operating segments
Revenue by reportable segment	$ 12	[1]	$ 7	[1]	$ 40	[1]	$ 20	[1]

[1] Represents revenue generated between our reportable segments.