Balance Sheet Components (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 27	$ 125
Other comprehensive income (loss) before reclassifications			(774)	(69)
Amounts reclassified from AOCI			(845)	(138)
Other comprehensive income (loss)	$ (663)	$ (584)	(1,619)	(207)
Ending balance	(1,592)	(82)	(1,592)	(82)
Foreign Currency Translation Adjustments
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(980)	16
Other comprehensive income (loss) before reclassifications			(850)	(623)
Amounts reclassified from AOCI			0	0
Other comprehensive income (loss)			(850)	(623)
Ending balance	(1,830)	(607)	(1,830)	(607)
Unrealized Gains (Losses) on Available-for-Sale Investments
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			421	50
Other comprehensive income (loss) before reclassifications			(504)	250
Amounts reclassified from AOCI			(73)	(122)
Other comprehensive income (loss)			(577)	128
Ending balance	(156)	178	(156)	178
Unrealized Gains on Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			586	59
Other comprehensive income (loss) before reclassifications			580	304
Amounts reclassified from AOCI			(772)	(16)
Other comprehensive income (loss)			(192)	288
Ending balance	$ 394	$ 347	$ 394	$ 347