Earnings per Share - Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Denominator
Number of shares used for basic EPS computation (in shares)	2,850	2,854	2,850	2,855
Basic EPS (in dollars per share)	$ 2.75	$ 2.13	$ 6.29	$ 3.90
Denominator
Number of shares used for diluted EPS computation (in shares)	2,891	2,874	2,883	2,875
Diluted EPS (in dollars per share)	$ 2.71	$ 2.12	$ 6.22	$ 3.87
Class A Common Stock
Numerator
Net income	$ 6,623	$ 5,138	$ 15,133	$ 9,372
Denominator
Number of shares used for basic EPS computation (in shares)	2,406	2,407	2,406	2,403
Basic EPS (in dollars per share)	$ 2.75	$ 2.13	$ 6.29	$ 3.90
Numerator
Net income	$ 6,623	$ 5,138	$ 15,133	$ 9,372
Reallocation of net income as a result of conversion of Class B to Class A common stock	1,223	953	2,794	1,764
Reallocation of net income to Class B common stock	0	0	0	0
Net income for diluted EPS	$ 7,846	$ 6,091	$ 17,927	$ 11,136
Denominator
Conversion of Class B to Class A common stock (in shares)	444	447	444	452
Weighted average effect of dilutive RSUs and employee stock options (in shares)	41	20	33	20
Number of shares used for diluted EPS computation (in shares)	2,891	2,874	2,883	2,875
Diluted EPS (in dollars per share)	$ 2.71	$ 2.12	$ 6.22	$ 3.87
Class B Common Stock
Numerator
Net income	$ 1,223	$ 953	$ 2,794	$ 1,764
Denominator
Number of shares used for basic EPS computation (in shares)	444	447	444	452
Basic EPS (in dollars per share)	$ 2.75	$ 2.13	$ 6.29	$ 3.90
Numerator
Net income	$ 1,223	$ 953	$ 2,794	$ 1,764
Reallocation of net income as a result of conversion of Class B to Class A common stock	0	0	0	0
Reallocation of net income to Class B common stock	(18)	(6)	(32)	(9)
Net income for diluted EPS	$ 1,205	$ 947	$ 2,762	$ 1,755
Denominator
Conversion of Class B to Class A common stock (in shares)	0	0	0	0
Weighted average effect of dilutive RSUs and employee stock options (in shares)	0	0	0	1
Number of shares used for diluted EPS computation (in shares)	444	447	444	453
Diluted EPS (in dollars per share)	$ 2.71	$ 2.12	$ 6.22	$ 3.87