Revenues (Revenue by Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 61,880	$ 38,297	$ 117,194	$ 79,456
Hedging gains (losses)	(7)	151	(116)	200
Revenues	61,880	38,297	117,194	79,456
Google Services
Segment Reporting Information [Line Items]
Revenue	57,067	34,991	108,245	73,189
Google Services | Google Search & other
Segment Reporting Information [Line Items]
Revenue	35,845	21,319	67,724	45,821
Google Services | YouTube ads
Segment Reporting Information [Line Items]
Revenue	7,002	3,812	13,007	7,850
Google Services | Google Network
Segment Reporting Information [Line Items]
Revenue	7,597	4,736	14,397	9,959
Google Services | Google advertising
Segment Reporting Information [Line Items]
Revenue	50,444	29,867	95,128	63,630
Google Services | Google other
Segment Reporting Information [Line Items]
Revenue	6,623	5,124	13,117	9,559
Google Cloud
Segment Reporting Information [Line Items]
Revenue	4,628	3,007	8,675	5,784
Other Bets
Segment Reporting Information [Line Items]
Revenue	$ 192	$ 148	$ 390	$ 283