Information about Segments and Geographic Areas (Operating Income/Loss by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Segment operating income / (loss)	$ 34,231	$ 27,524	$ 26,178
Operating Segments | Google
Segment Reporting Information [Line Items]
Segment operating income / (loss)	41,673	36,655	32,456
Operating Segments | Other Bets
Segment Reporting Information [Line Items]
Segment operating income / (loss)	(4,824)	(3,358)	(2,734)
Reconciling items
Segment Reporting Information [Line Items]
Segment operating income / (loss)	$ (2,618)	$ (5,773)	$ (3,544)