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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