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Unsecured Debt (Details) € in Millions, £ in Millions, $ in Millions | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 31, 2016 USD ($) | May 31, 2016 EUR (€) credit_facility | Apr. 30, 2016 USD ($) | Feb. 29, 2016 USD ($) | Aug. 31, 2016 USD ($) CruiseShip | Jul. 31, 2016 USD ($) | May 31, 2016 GBP (£) | May 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) | 0.20% |  |  |  | 0.20% |  |  |
Proceeds from Lines of Credit |  |  | $ 379 |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 2,300 |  |  |  | $ 2,300 |  |  |
Number of cruise ships purchased | CruiseShip |  |  |  |  | 4 |  |  |
Extinguishment of Debt, Amount | 201 |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of export credit facilities | credit_facility |  | 4 |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 2,600
Revolving Credit Facility | Euro Member Countries, Euro |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | € |  | € 500 |  |  |  |  |  |
Revolving Credit Facility | United States of America, Dollars |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 1,900
Revolving Credit Facility | United Kingdom, Pounds |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | £ |  |  |  |  |  |  | £ 169 |
Commercial Paper | Euro Member Countries, Euro |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Short-term borrowings | 246 |  |  |  | $ 246 |  |  |
Commercial Paper | United States of America, Dollars |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Short-term borrowings | 85 |  |  |  | 85 |  |  |
Euro-denominated | Bank Loans |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Short-term borrowings | $ 3 |  |  |  | $ 3 |  |  |
Publicly Traded Notes Euro-denominated Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of notes |  |  |  | $ 555 |  |  |  |
Notes, interest rate (percentage) | 1.625% |  |  |  | 1.625% |  |  |
Floating Rate Bank Loan Due July 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 110 |  |
Fixed Rate Bank Loan Due September 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | 168 |  |
Floating Rate Bank Loan Due November 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 100 |  |
Floating Rate Bank Loan Due October 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 100 |  |  |  | $ 100 |  |  |

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