Supplemental Financial Statement Information (Schedule of Other Income (Expense), Net) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Balance Sheet Components Disclosure [Abstract]
Interest income	$ 522	$ 399
Interest expense	(35)	(30)
Foreign currency exchange losses, net	74	(24)
Gain (loss) on debt securities, net	(2)	(39)
Gain on equity securities, net	1,083	3,031
Performance fees	(117)	(632)
Loss and impairment from equity method investments, net	(40)	(7)
Other	53	212
Other income (expense), net	1,538	2,910
Interest costs capitalized	$ 31	$ 16