Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended
	May 31, 2012 Unsecured Euro Denominated Export Credit Facility	May 31, 2012 Unsecured Export Credit Facility	Jun. 30, 2012 Unsecured Fixed Rate Sterling-Denominated Publicly-Traded Notes	May 31, 2012 EURIBOR Unsecured Euro Denominated Export Credit Facility	May 31, 2012 LIBOR Unsecured Export Credit Facility
Short-term Debt [Line Items]
Unsecured long-term debt	$ 383	$ 560
Interest rate at facility	EURIBOR plus a margin of 20 basis points ("bps") and is due in semi-annual installments through May 2024.	LIBOR plus a margin of 160 bps and is due in semi-annual installments through May 2024.
Debt instrument interest rate				0.20%	1.60%
Debt instrument maturity period	2024-05	2024-05
Repayment of unsecured fixed rate sterling-denominated publicly traded notes			$ 312