Information about Segments and Geographic Areas (Revenue by Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenue	$ 46,173	$ 40,499	$ 125,629	$ 115,782
Hedging gains (losses)	(22)	119	178	364
Google
Segment Reporting Information [Line Items]
Revenue	46,017	40,225	124,990	114,931
Other Bets
Segment Reporting Information [Line Items]
Revenue	$ 178	$ 155	$ 461	$ 487