Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator
Net income	$ 2,627	$ 2,283	$ 1,738	$ 10,217	$ 3,688	$ 2,940
Less: Net income attributable to participating securities				29	19	15
Net income attributable to Class A and Class B common stockholders				$ 10,188	$ 3,669	$ 2,925
Denominator
Number of shares used for basic EPS computation (in shares)				2,863	2,803	2,614
Basic EPS (in dollars per share)	$ 0.91	$ 0.80	$ 0.61	$ 3.56	$ 1.31	$ 1.12
Numerator
Net income attributable to Class A and Class B common stockholders				$ 10,188	$ 3,669	$ 2,925
Denominator
Number of shares used for basic EPS computation (in shares)				2,863	2,803	2,614
Number of shares used for diluted EPS computation (in shares)	2,931	2,921	2,905	2,925	2,853	2,664
Diluted EPS (in dollars per share)	$ 0.90	$ 0.78	$ 0.60	$ 3.49	$ 1.29	$ 1.10
Class A Common Stock
Numerator
Net income				$ 8,270	$ 2,959	$ 2,308
Less: Net income attributable to participating securities				24	15	12
Net income attributable to Class A and Class B common stockholders				$ 8,246	$ 2,944	$ 2,296
Denominator
Weighted average shares outstanding (in shares)				2,323	2,259	2,059
Less: Shares subject to repurchase (in shares)				6	10	6
Number of shares used for basic EPS computation (in shares)				2,317	2,249	2,053
Basic EPS (in dollars per share)				$ 3.56	$ 1.31	$ 1.12
Numerator
Net income attributable to Class A and Class B common stockholders				$ 8,246	$ 2,944	$ 2,296
Reallocation of net income attributable to participating securities				29	19	15
Reallocation of net income as a result of conversion of Class B to Class A common stock				1,942	725	629
Reallocation of net income to Class B common stock				0	0	0
Net income attributable to common stockholders for diluted EPS				$ 10,217	$ 3,688	$ 2,940
Denominator
Number of shares used for basic EPS computation (in shares)				2,317	2,249	2,053
Conversion of Class B to Class A common stock (in shares)				546	554	561
Shares subject to repurchase (in shares)				5	5	7
Earn-out shares (in shares)				2	0	0
Number of shares used for diluted EPS computation (in shares)				2,925	2,853	2,664
Diluted EPS (in dollars per share)				$ 3.49	$ 1.29	$ 1.10
Class A Common Stock | Employee Stock Option
Denominator
Share based payment arrangements (in shares)				6	8	13
Class A Common Stock | Restricted Stock Units (RSUs)
Denominator
Share based payment arrangements (in shares)				49	37	30
Class B Common Stock
Numerator
Net income				$ 1,947	$ 729	$ 632
Less: Net income attributable to participating securities				5	4	3
Net income attributable to Class A and Class B common stockholders				$ 1,942	$ 725	$ 629
Denominator
Weighted average shares outstanding (in shares)				548	559	568
Less: Shares subject to repurchase (in shares)				2	5	7
Number of shares used for basic EPS computation (in shares)				546	554	561
Basic EPS (in dollars per share)				$ 3.56	$ 1.31	$ 1.12
Numerator
Net income attributable to Class A and Class B common stockholders				$ 1,942	$ 725	$ 629
Reallocation of net income attributable to participating securities				0	0	0
Reallocation of net income as a result of conversion of Class B to Class A common stock				0	0	0
Reallocation of net income to Class B common stock				14	15	23
Net income attributable to common stockholders for diluted EPS				$ 1,956	$ 740	$ 652
Denominator
Number of shares used for basic EPS computation (in shares)				546	554	561
Conversion of Class B to Class A common stock (in shares)				0	0	0
Shares subject to repurchase (in shares)				1	2	4
Earn-out shares (in shares)				2	0	0
Number of shares used for diluted EPS computation (in shares)				560	573	591
Diluted EPS (in dollars per share)				$ 3.49	$ 1.29	$ 1.10
Class B Common Stock | Employee Stock Option
Denominator
Share based payment arrangements (in shares)				6	8	13
Class B Common Stock | Restricted Stock Units (RSUs)
Denominator
Share based payment arrangements (in shares)				5	9	13