Net Income Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator
Adjustment Payment to Class C capital stockholders	$ 0	$ (522)	$ 0
Allocation of undistributed earnings - continuing operations	19,478	16,348	13,620
Allocation of undistributed earnings - discontinued operations	0	0	516
Net income available to all stockholders	19,478	15,826	14,136
Numerator
Adjustment Payment to Class C capital stockholders	0	(522)	0
Allocation of undistributed earnings - continuing operations	19,478	16,348	13,620
Allocation of undistributed earnings - discontinued operations	0	0	516
Class A Common Stock
Numerator
Adjustment Payment to Class C capital stockholders		0
Allocation of undistributed earnings - continuing operations	$ 8,332	6,695	5,700
Allocation of undistributed earnings - discontinued operations			216
Net income available to all stockholders		$ 6,695	$ 5,916
Denominator
Number of shares used in basic computation (in shares)	294,217	289,640	282,877
Continuing operations (in USD per share)			$ 20.15
Discontinued operations (in USD per share)			0.76
Net income per share - basic (in USD per share)	$ 28.32	$ 23.11	$ 20.91
Numerator
Adjustment Payment to Class C capital stockholders		$ 0
Allocation of undistributed earnings - continuing operations	$ 8,332	6,695	$ 5,700
Effect of dilutive securities in equity method investments and subsidiaries	(9)
Allocation of undistributed earnings - continuing operations	8,323
Allocation of undistributed earnings - discontinued operations			$ 216
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares	1,382	1,196
Reallocation of undistributed earnings	(94)	(39)
Allocation of undistributed earnings	$ 9,611	$ 7,852
Denominator
Number of shares used in basic computation (in shares)	294,217	289,640	282,877
Weighted-average effect of dilutive securities
Conversion of Class B to Class A common shares outstanding (in shares)	48,859	51,745	54,928
Restricted stock units and other contingently issuable shares (in shares)	2,055	2,395	4,572
Number of shares used in per share computation (in shares)	345,131	343,780	342,377
Continuing operations (in USD per share)			$ 19.82
Discontinued operations (in USD per share)			0.75
Net income per share - diluted (in USD per share)	$ 27.85	$ 22.84	$ 20.57
Class A Common Stock \| Continuing operations
Numerator
Allocation of undistributed earnings - continuing operations			$ 5,700
Numerator
Allocation of undistributed earnings - continuing operations			5,700
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares			1,107
Reallocation of undistributed earnings			(20)
Allocation of undistributed earnings			6,787
Class A Common Stock \| Discontinued operations
Numerator
Allocation of undistributed earnings - discontinued operations			216
Numerator
Allocation of undistributed earnings - discontinued operations			216
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares			42
Reallocation of undistributed earnings			(1)
Allocation of undistributed earnings			257
Class B Common Stock
Numerator
Adjustment Payment to Class C capital stockholders		$ 0
Allocation of undistributed earnings - continuing operations	$ 1,384	1,196	1,107
Allocation of undistributed earnings - discontinued operations			42
Net income available to all stockholders		$ 1,196	$ 1,149
Denominator
Number of shares used in basic computation (in shares)	48,859	51,745	54,928
Continuing operations (in USD per share)			$ 20.15
Discontinued operations (in USD per share)			0.76
Net income per share - basic (in USD per share)	$ 28.32	$ 23.11	$ 20.91
Numerator
Adjustment Payment to Class C capital stockholders		$ 0
Allocation of undistributed earnings - continuing operations	$ 1,384	1,196	$ 1,107
Effect of dilutive securities in equity method investments and subsidiaries	(2)
Allocation of undistributed earnings - continuing operations	1,382
Allocation of undistributed earnings - discontinued operations			$ 42
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares	0	0
Reallocation of undistributed earnings	(21)	(14)
Allocation of undistributed earnings	$ 1,361	$ 1,182
Denominator
Number of shares used in basic computation (in shares)	48,859	51,745	54,928
Weighted-average effect of dilutive securities
Conversion of Class B to Class A common shares outstanding (in shares)	0	0	0
Restricted stock units and other contingently issuable shares (in shares)	0	0	0
Number of shares used in per share computation (in shares)	48,859	51,745	54,928
Continuing operations (in USD per share)			$ 19.82
Discontinued operations (in USD per share)			0.75
Net income per share - diluted (in USD per share)	$ 27.85	$ 22.84	$ 20.57
Class B Common Stock \| Continuing operations
Numerator
Allocation of undistributed earnings - continuing operations			$ 1,107
Numerator
Allocation of undistributed earnings - continuing operations			1,107
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares			0
Reallocation of undistributed earnings			(18)
Allocation of undistributed earnings			1,089
Class B Common Stock \| Discontinued operations
Numerator
Allocation of undistributed earnings - discontinued operations			42
Numerator
Allocation of undistributed earnings - discontinued operations			42
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares			0
Reallocation of undistributed earnings			(1)
Allocation of undistributed earnings			41
Class C Capital Stock
Numerator
Adjustment Payment to Class C capital stockholders		$ 522
Allocation of undistributed earnings - continuing operations	$ 9,762	7,935	6,813
Allocation of undistributed earnings - discontinued operations			258
Net income available to all stockholders		$ 8,457	$ 7,071
Denominator
Number of shares used in basic computation (in shares)	344,702	343,241	338,130
Continuing operations (in USD per share)	$ 28.32	$ 24.63	$ 20.15
Discontinued operations (in USD per share)	0.00	0.00	0.76
Net income per share - basic (in USD per share)	$ 28.32	$ 24.63	$ 20.91
Numerator
Adjustment Payment to Class C capital stockholders		$ 522
Allocation of undistributed earnings - continuing operations	$ 9,762	7,935	$ 6,813
Effect of dilutive securities in equity method investments and subsidiaries	(10)
Allocation of undistributed earnings - continuing operations	9,752
Allocation of undistributed earnings - discontinued operations			$ 258
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares	0	0
Reallocation of undistributed earnings	94	39
Allocation of undistributed earnings	$ 9,846	$ 7,974
Denominator
Number of shares used in basic computation (in shares)	344,702	343,241	338,130
Weighted-average effect of dilutive securities
Conversion of Class B to Class A common shares outstanding (in shares)	0	0	0
Restricted stock units and other contingently issuable shares (in shares)	8,873	5,909	6,563
Number of shares used in per share computation (in shares)	353,575	349,150	344,693
Continuing operations (in USD per share)	$ 27.85	$ 24.34	$ 19.82
Discontinued operations (in USD per share)	0.00	0.00	0.75
Net income per share - diluted (in USD per share)	$ 27.85	$ 24.34	$ 20.57
Class C Capital Stock \| Continuing operations
Numerator
Allocation of undistributed earnings - continuing operations			$ 6,813
Numerator
Allocation of undistributed earnings - continuing operations			6,813
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares			0
Reallocation of undistributed earnings			20
Allocation of undistributed earnings			6,833
Class C Capital Stock \| Discontinued operations
Numerator
Allocation of undistributed earnings - discontinued operations			258
Numerator
Allocation of undistributed earnings - discontinued operations			258
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares			0
Reallocation of undistributed earnings			1
Allocation of undistributed earnings			$ 259

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