Stockholders Equity - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	9 Months Ended		1 Months Ended
Sep. 30, 2013	Dec. 31, 2012	Jan. 31, 2010 Share Repurchase Program, 2010
Stockholders Equity Note [Line Items]
Repurchase program authorized by Board of Directors			$ 2,000,000,000
Repurchase program authorized, remaining common stock			763,000,000
Common shares outstanding plus shares underlying outstanding stock awards, including all stock-based awards outstanding, including estimated forfeiture	475	470
Net unrecognized compensation cost related to unvested stock-based compensation arrangements	$ 1,700,000,000
Net unrecognized compensation cost related to unvested stock-based compensation arrangements, weighted average recognition period (in years)	1 year 2 months 24 days

Common Stock, Shares, Outstanding Including Stock Awards

No definition available.

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- Details

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount of a stock repurchase plan authorized by an entity's Board of Directors.

+ References

No definition available.

+ Details

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- Definition

Amount remaining of a stock repurchase plan authorized by an entity's Board of Directors.

+ References

No definition available.

+ Details

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