v2.4.0.8

Fair Value Measurements - Schedule of Fair Value and Carrying Value of Our 2016 Notes, 2019 Notes and Term Loans (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial instrument, face amount	$ 800
$400 million 2016 notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial instrument, face amount	400	400
$800 million 2019 notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial instrument, face amount	800	800
$1,775 million Term Loan B [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial instrument, face amount	1,775	1,775
$350 million Incremental Term Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial instrument, face amount	350	350
$425 million Term Loan C [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial instrument, face amount	$ 425	$ 425

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration