Computation of Basic and Diluted Net Income Per Share (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Numerator
Allocation of undistributed earnings	$ 2,890	$ 1,798
Denominator
Basic net income per share	$ 8.88	$ 5.59
Numerator
Allocation of undistributed earnings for basic computation	2,890	1,798
Add:
Diluted net income per share	$ 8.75	$ 5.51
Class A Common Stock
Numerator
Allocation of undistributed earnings	2,296	1,406
Denominator
Weighted-average common shares outstanding	258,426	251,355
Number of shares used in per share computation	258,426	251,355
Basic net income per share	$ 8.88	$ 5.59
Numerator
Allocation of undistributed earnings for basic computation	2,296	1,406
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares	594	392
Reallocation of undistributed earnings to Class B shares	0	0
Allocation of undistributed earnings	2,890	1,798
Denominator
Number of shares used in basic computation	258,426	251,355
Add:
Conversion of Class B to Class A common shares outstanding	66,873	70,172
Employee stock options, including warrants issued under Transferable Stock Option program	2,957	3,327
Restricted stock units	1,880	1,529
Number of shares used in per share computation	330,136	326,383
Diluted net income per share	$ 8.75	$ 5.51
Class B Common Stock
Numerator
Allocation of undistributed earnings	594	392
Denominator
Weighted-average common shares outstanding	66,873	70,172
Number of shares used in per share computation	66,873	70,172
Basic net income per share	$ 8.88	$ 5.59
Numerator
Allocation of undistributed earnings for basic computation	594	392
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares	0	0
Reallocation of undistributed earnings to Class B shares	(9)	(5)
Allocation of undistributed earnings	$ 585	$ 387
Denominator
Number of shares used in basic computation	66,873	70,172
Add:
Conversion of Class B to Class A common shares outstanding	0	0
Employee stock options, including warrants issued under Transferable Stock Option program	43	55
Restricted stock units	0	0
Number of shares used in per share computation	66,916	70,227
Diluted net income per share	$ 8.75	$ 5.51

Dilutive impact on our earnings per share for the period as a result of conversion of Class B to Class A common stock.

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The dilutive effect of unvested restricted stock units using the treasury stock method.

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Reallocation of undistributed earnings to Class B shares.

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Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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