Revenues (Revenue by Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 41,159	$ 36,339
Hedging gains (losses)	49	137
Google
Segment Reporting Information [Line Items]
Revenue	40,975	36,032
Google | Google Search & other
Segment Reporting Information [Line Items]
Revenue	24,502	22,547
Google | YouTube ads
Segment Reporting Information [Line Items]
Revenue	4,038	3,025
Google | Google properties
Segment Reporting Information [Line Items]
Revenue	28,540	25,572
Google | Google Network Members' properties
Segment Reporting Information [Line Items]
Revenue	5,223	5,015
Google | Google advertising
Segment Reporting Information [Line Items]
Revenue	33,763	30,587
Google | Google Cloud
Segment Reporting Information [Line Items]
Revenue	2,777	1,825
Google | Google other
Segment Reporting Information [Line Items]
Revenue	4,435	3,620
Other Bets
Segment Reporting Information [Line Items]
Revenue	$ 135	$ 170