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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended	1 Months Ended
	Dec. 31, 2013	Aug. 01, 2007 2007 Program Maximum	Jul. 25, 2012 2012 Program Maximum	Sep. 06, 2013 2013 Program Maximum	Feb. 28, 2014 Dividend Declared Subsequent Event
Stockholders Equity Note [Line Items]
Dividend declaration date					Feb. 05, 2014
Dividend per share, declared					$ 0.10
Dividend payment date					Mar. 27, 2014
Dividend record date					Mar. 12, 2014
Amount approved for repurchases under stock buyback program		$ 250	$ 150	$ 200
Remaining Amount approved for repurchases under stock buyback program	$ 187

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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- Definition

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

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

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