Stockholders' Equity - Additional Information (Detail) (USD $)								5 Months Ended	12 Months Ended
Jun. 30, 2014	Nov. 30, 2013	Feb. 28, 2013	Aug. 31, 2011	Mar. 31, 2011	Aug. 31, 2010	May 31, 2010	Nov. 30, 2013 Fifth Share Repurchase Program	Jun. 30, 2014 Sixth Share Repurchase Program	Nov. 30, 2013 Sixth Share Repurchase Program
Stockholders Equity Note [Line Items]
Share repurchase program, authorized amount	$ 1,000,000,000	$ 300,000,000	$ 200,000,000	$ 200,000,000	$ 100,000,000	$ 100,000,000	$ 100,000,000	$ 200,000,000		$ 300,000,000
Shares repurchased								$ 153,000,000	$ 134,000,000

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5

Name:	us-gaap_StockRepurchasedDuringPeriodValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration