Condensed Consolidated Statement of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement [Abstract]
Net revenues	$ 3,748	$ 3,277
Cost of net revenues	1,152	983
Gross profit	2,596	2,294
Operating expenses:
Sales and marketing	697	677
Product development	434	374
General and administrative	408	372
Provision for transaction and loan losses	175	134
Amortization of acquired intangible assets	82	84
Total operating expenses	1,796	1,641
Income from operations	800	653
Interest and other, net	9	31
Income before income taxes	809	684
Provision for income taxes	(132)	(114)
Net income	$ 677	$ 570
Net income per share:
Basic	$ 0.52	$ 0.44
Diluted	$ 0.51	$ 0.44
Weighted average shares:
Basic	1,295	1,288
Diluted	1,319	1,308