The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2611-110228

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 27, 28, 29, 30

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

Costa Concordia and Costa Allegra - Additional Information (Detail) In Millions, unless otherwise specified	9 Months Ended	3 Months Ended	1 Months Ended		3 Months Ended		9 Months Ended
	Aug. 31, 2012 USD ($)	Feb. 29, 2012 Costa Allegra USD ($)	May 31, 2012 Costa Concordia USD ($)	May 31, 2012 Costa Concordia EUR (€)	Feb. 29, 2012 Costa Concordia USD ($)	Feb. 29, 2012 Costa Concordia EUR (€)	Aug. 31, 2012 Costa Concordia USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups [Line Items]
Asset impairment charge		$ 34			$ 515	€ 381
Insurance proceeds from the loss of Costa Concordia	508		508	395
Insurance proceeds in excess of net carrying from the loss of Costa Concordia			17	14
Other charges recognized							30
Insurance deductible for third party personal injury liability							$ 10