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Unsecured Debt - Additional Information (Detail) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2015 | Feb. 28, 2015 USD ($) | Sep. 30, 2015 USD ($) | Aug. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |
Weighted average interest rate |  |  |  | 1.30%
Export Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  | $ 505 |  |
Euro-denominated Export Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from credit facility |  | $ 472 |  |
Bank Loans | Euro-denominated |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term borrowings |  |  |  | $ 35
Main Credit Facility | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Expiration Period | 5 years |  |  |
Subsequent Event | Export Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  |  | $ 2,800 |
Line of Credit Facility, Number |  |  | 5 |
Line of Credit Facility, Number of Cruise Ships |  |  | 5 |

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- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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