Information about Segments and Geographic Areas (Stock-based Compensation and Depreciation, Amortization and Impairment by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Stock-based compensation expense	$ 10,794	$ 9,353	$ 7,679
Depreciation, amortization and impairment	11,781	9,035	6,915
Operating Segments | Google
Segment Reporting Information [Line Items]
Stock-based compensation expense	10,185	8,755	7,168
Depreciation, amortization and impairment	11,158	8,708	6,608
Operating Segments | Other Bets
Segment Reporting Information [Line Items]
Stock-based compensation expense	474	489	363
Depreciation, amortization and impairment	566	327	307
Reconciling items
Segment Reporting Information [Line Items]
Stock-based compensation expense	135	109	148
Depreciation, amortization and impairment	$ 57	$ 0	$ 0