Condensed Consolidated Statement of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Net revenues	$ 3,877	$ 3,398	$ 7,625	$ 6,675
Cost of net revenues	1,211	987	2,363	1,970
Gross profit	2,666	2,411	5,262	4,705
Operating expenses:
Sales and marketing	771	717	1,468	1,394
Product development	451	394	885	768
General and administrative	419	390	827	762
Provision for transaction and loan losses	193	131	368	265
Amortization of acquired intangible assets	82	84	164	168
Total operating expenses	1,916	1,716	3,712	3,357
Income from operations	750	695	1,550	1,348
Interest and other, net	6	38	15	69
Gain on divested business	0	118	0	118
Income before income taxes	756	851	1,565	1,535
Provision for income taxes	(116)	(159)	(248)	(273)
Net income	$ 640	$ 692	$ 1,317	$ 1,262
Net income per share:
Basic	$ 0.49	$ 0.54	$ 1.02	$ 0.98
Diluted	$ 0.49	$ 0.53	$ 1.00	$ 0.96
Weighted average shares:
Basic	1,297	1,291	1,296	1,290
Diluted	1,313	1,309	1,316	1,309