Balance Sheet Components (Effects on Net Income of Amounts Reclassified from AOCI) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Revenue	$ 18,675		$ 16,523	$ 53,660	$ 47,898
Interest and other income, net	183		133	471	635
Provision for income taxes	(912)	$ (1,089)	(933)	(3,026)	(2,820)
Net income	3,979	$ 3,515	2,739	11,425	9,461
Gains (Losses) Reclassified from AOCI to the Consolidated Statement of Income
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Net income	208		22	845	138
Gains (Losses) Reclassified from AOCI to the Consolidated Statement of Income | Unrealized gains on available-for-sale investments
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Interest and other income, net	(6)		18	79	140
Provision for income taxes	2		(3)	(6)	(18)
Net income	(4)		15	73	122
Gains (Losses) Reclassified from AOCI to the Consolidated Statement of Income | Unrealized gains on cash flow hedges
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	(75)		(4)	(299)	(10)
Net income	212		7	772	16
Foreign exchange contracts | Gains (Losses) Reclassified from AOCI to the Consolidated Statement of Income | Unrealized gains on cash flow hedges
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Revenue	286		10	1,068	24
Interest rate contracts | Gains (Losses) Reclassified from AOCI to the Consolidated Statement of Income | Unrealized gains on cash flow hedges
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Interest and other income, net	$ 1		$ 1	$ 3	$ 2