Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of Revenue	$ (1,351)	$ (1,152)
Sales and marketing	(805)	(697)
Product development	(480)	(434)
General and administrative	(465)	(408)
Interest and other, net	(5)	9
Provision for income taxes	3,199	132
Net income (loss)	(2,326)	677
Accumulated Other Comprehensive Income (Loss) Tax Provision (Benefit)	(277)	(282)	(316)	(225)
Accumulated other comprehensive income	1,084	724	1,156	856
Other comprehensive income before reclassifications, tax	39	(57)
Other comprehensive income before reclassifications	(86)	(135)
Amounts reclassified from accumulated other comprehensive income, tax	0	0
Amounts reclassified from other comprehensive income	(14)	(3)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	39	(57)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(72)	(132)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	(14)	(3)
Unrealized Gains (Losses) on Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), before Tax	(91)	31	(106)	(55)
Other comprehensive income, before reclassifications, before tax	(6)	82
Amounts reclassified from accumulated other comprehensive income, before tax	(21)	(4)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	15	86
Unrealized Gains (Losses) on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue by reportable segment	(17)	0
Cost of Revenue	(1)	0
Sales and marketing	0	(1)
Product development	(2)	(2)
General and administrative	(1)	(1)
Income (loss) before taxes	(21)	(4)
Provision for income taxes	0	0
Net income (loss)	(21)	(4)
Unrealized Gains on Investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), before Tax	824	827	921	687
Other comprehensive income, before reclassifications, before tax	(90)	141
Amounts reclassified from accumulated other comprehensive income, before tax	7	1
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(97)	140
Unrealized Gains on Investments | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) before taxes	7	1
Interest and other, net	7	1
Provision for income taxes	0	0
Net income (loss)	7	1
Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), before Tax	628	148	657	449
Other comprehensive income, before reclassifications, before tax	(29)	(301)
Amounts reclassified from accumulated other comprehensive income, before tax	0	0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	$ (29)	$ (301)