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Debt (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
May 01, 2019
Apr. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Long-Term Debt          
Short-term debt amount outstanding     $ 1,200,000,000.0    
Commercial Paper          
Long-Term Debt          
Borrowings outstanding       $ 1,100,000,000 $ 777,000,000
Weighted average interest rate       3.04% 3.19%
Long term debt, term       34 days 23 days
$1.4 billion Unsecured Revolving Credit Facility | Revolving Credit Facility          
Long-Term Debt          
Long-term debt       $ 1,400,000,000.0  
Facility fee       0.125%  
Subsequent Event | Loans Payable          
Long-Term Debt          
Loss on debt extinguishment $ 6,500,000        
Subsequent Event | $1.4 billion Unsecured Revolving Credit Facility | Revolving Credit Facility          
Long-Term Debt          
Long-term debt   $ 1,700,000,000.0      
Subsequent Event | Term Loan | Loans Payable          
Long-Term Debt          
Long term debt, term   3 years      
Long-term debt   $ 1,000,000,000.0      
Subsequent Event | Silversea Cruises          
Long-Term Debt          
Long-term debt   $ 700,000,000      
Subsequent Event | Novation Agreement | Unsecured Debt          
Long-Term Debt          
Long term debt, term   12 years      
Unsecured debt   $ 908,000,000      
Interest rate   3.45%      
LIBOR | $1.4 billion Unsecured Revolving Credit Facility | Revolving Credit Facility          
Long-Term Debt          
Debt instrument, basis spread on variable rate       1.00%  
LIBOR | Subsequent Event | Term Loan | Loans Payable          
Long-Term Debt          
Debt instrument, basis spread on variable rate   1.075%      
Euler Hermes | Subsequent Event | Novation Agreement | Unsecured Debt          
Long-Term Debt          
Percentage guaranteed by export credit agency   95.00%