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Debt - Summary of Debt (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Feb. 29, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Total debt $ 16,283,622,000   $ 11,241,483,000
Less: unamortized debt issuance costs (254,750,000)   (206,607,000)
Total debt, net of unamortized debt issuance costs 16,028,872,000   11,034,876,000
Less—current portion including commercial paper (3,755,550,000)   (2,620,766,000)
Long-term portion $ 12,273,322,000   $ 8,414,110,000
Debt, Weighted Average Interest Rate 3.98%   3.99%
Commercial paper      
Debt Instrument [Line Items]      
Current interest rate 1.93%    
Long-term debt, gross $ 343,557,000   $ 1,434,180,000
Total fixed rate debt      
Debt Instrument [Line Items]      
Long-term debt, gross 5,905,851,000   5,215,452,000
Unsecured senior notes      
Debt Instrument [Line Items]      
Long-term debt, gross $ 1,767,059,000   1,746,280,000
Unsecured senior notes | Minimum      
Debt Instrument [Line Items]      
Interest rate 2.65%    
Unsecured senior notes | Maximum      
Debt Instrument [Line Items]      
Interest rate 7.50%    
Secured senior notes      
Debt Instrument [Line Items]      
Interest rate 7.25%    
Long-term debt, gross $ 658,645,000   662,398,000
Unsecured term loans      
Debt Instrument [Line Items]      
Long-term debt, gross $ 3,480,147,000   2,806,774,000
Unsecured term loans | Minimum      
Debt Instrument [Line Items]      
Interest rate 2.53%    
Unsecured term loans | Maximum      
Debt Instrument [Line Items]      
Interest rate 5.41%    
Total variable rate debt      
Debt Instrument [Line Items]      
Long-term debt, gross $ 10,151,300,000   5,795,773,000
Unsecured revolving credit facilities      
Debt Instrument [Line Items]      
Current interest rate 2.79%    
Long-term debt, gross $ 3,475,000,000   165,000,000
Maximum borrowing capacity $ 3,500,000,000    
Facility fee 0.15%    
Unsecured revolving credit facilities | Unsecured Revolving Credit Facility Due 2024      
Debt Instrument [Line Items]      
Current interest rate 2.55%    
Maximum borrowing capacity $ 1,900,000,000 $ 1,700,000,000  
Unsecured revolving credit facilities | Unsecured Revolving Credit Facility Due 2024 | LIBOR      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate 1.10%    
Unsecured revolving credit facilities | Unsecured Revolving Credit Facility Due 2022      
Debt Instrument [Line Items]      
Current interest rate 2.55%    
Maximum borrowing capacity $ 1,600,000,000 $ 1,200,000,000  
Unsecured revolving credit facilities | Unsecured Revolving Credit Facility Due 2022 | LIBOR      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate 1.10%    
USD secured term loan      
Debt Instrument [Line Items]      
Long-term debt, gross $ 2,200,000,000   0
USD secured term loan | Minimum      
Debt Instrument [Line Items]      
Current interest rate 2.25%    
USD secured term loan | Maximum      
Debt Instrument [Line Items]      
Current interest rate 2.75%    
USD unsecured term loan      
Debt Instrument [Line Items]      
Long-term debt, gross $ 3,471,256,000   3,519,853,000
USD unsecured term loan | Minimum      
Debt Instrument [Line Items]      
Current interest rate 1.55%    
USD unsecured term loan | Maximum      
Debt Instrument [Line Items]      
Current interest rate 5.64%    
Euro unsecured term loan      
Debt Instrument [Line Items]      
Long-term debt, gross $ 661,487,000   676,740,000
Euro unsecured term loan | Minimum      
Debt Instrument [Line Items]      
Current interest rate 1.15%    
Euro unsecured term loan | Maximum      
Debt Instrument [Line Items]      
Current interest rate 1.58%    
Finance lease liabilities      
Debt Instrument [Line Items]      
Long-term debt, gross $ 226,471,000   $ 230,258,000