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Debt - Debt (Parenthetical) (Detail)	Dec. 31, 2013
Senior Notes, interest at 6.125% payable semiannually, principal due on August 15, 2015 [Member]
Debt Instrument [Line Items]
Senior notes interest rate	6.125%
Senior Notes, interest at 1.35% payable semiannually, principal due on December 1, 2017 [Member]
Debt Instrument [Line Items]
Senior notes interest rate	1.35%
Senior Notes, interest at 2.6% payable semiannually, principal due on December 1, 2022 [Member]
Debt Instrument [Line Items]
Senior notes interest rate	2.60%
Senior Notes, interest at 3.95% payable semiannually, principal due on December 1, 2042 [Member]
Debt Instrument [Line Items]
Senior notes interest rate	3.95%

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	na
Period Type:	instant

X

- Details

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