Information about Segments and Geographic Areas (Operating Income (Loss) by Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Segment operating income (loss)	$ 6,608	$ 7,633
Operating Segments | Google
Segment Reporting Information [Line Items]
Segment operating income (loss)	9,325	8,368
Operating Segments | Other Bets
Segment Reporting Information [Line Items]
Segment operating income (loss)	(868)	(571)
Reconciling items
Segment Reporting Information [Line Items]
Segment operating income (loss)	$ (1,849)	$ (164)