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Debt - Summary of Debt (Details) - USD ($)
6 Months Ended
Jun. 30, 2020
Feb. 29, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Total debt [1] $ 19,143,091,000   $ 11,241,483,000
Less: unamortized debt issuance costs (314,432,000)   (206,607,000)
Total debt, net of unamortized debt issuance costs 18,828,659,000   11,034,876,000
Less—current portion including commercial paper (1,075,235,000)   (2,620,766,000)
Long-term portion $ 17,753,424,000   $ 8,414,110,000
Weighted average interest rate 5.68%   3.99%
UK Commercial paper      
Debt Instrument [Line Items]      
Long-term debt, gross $ 368,952,000   $ 0
USD Commercial paper      
Debt Instrument [Line Items]      
Long-term debt, gross 0   1,434,180,000
Total fixed rate debt      
Debt Instrument [Line Items]      
Long-term debt, gross 10,980,489,000   5,215,452,000
Unsecured senior notes      
Debt Instrument [Line Items]      
Long-term debt, gross $ 2,768,980,000   1,746,280,000
Unsecured senior notes | Minimum      
Debt Instrument [Line Items]      
Interest rate [2] 2.65%    
Unsecured senior notes | Maximum      
Debt Instrument [Line Items]      
Interest rate [2] 9.13%    
Secured senior notes      
Debt Instrument [Line Items]      
Long-term debt, gross $ 3,887,409,000   662,398,000
Secured senior notes | Minimum      
Debt Instrument [Line Items]      
Interest rate 7.25%    
Secured senior notes | Maximum      
Debt Instrument [Line Items]      
Interest rate 11.50%    
Unsecured term loans      
Debt Instrument [Line Items]      
Long-term debt, gross $ 3,385,090,000   2,806,774,000
Unsecured term loans | Minimum      
Debt Instrument [Line Items]      
Interest rate [2] 2.53%    
Unsecured term loans | Maximum      
Debt Instrument [Line Items]      
Interest rate [2] 5.41%    
Convertible notes      
Debt Instrument [Line Items]      
Interest rate 4.25%    
Long-term debt, gross $ 939,010,000   0
Total variable rate debt      
Debt Instrument [Line Items]      
Long-term debt, gross $ 7,944,300,000   5,795,773,000
Unsecured revolving credit facilities      
Debt Instrument [Line Items]      
Current interest rate [2],[3] 1.48%    
Long-term debt, gross [3] $ 3,385,000,000   165,000,000
Maximum borrowing capacity $ 3,500,000,000    
Unsecured revolving credit facilities | Unsecured Revolving Credit Facility Due 2024      
Debt Instrument [Line Items]      
Current interest rate 1.60%    
Maximum borrowing capacity $ 1,900,000,000 $ 1,700,000,000  
Facility fee 0.20%    
Unsecured revolving credit facilities | Unsecured Revolving Credit Facility Due 2024 | LIBOR      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate 1.30%    
Unsecured revolving credit facilities | Unsecured Revolving Credit Facility Due 2022      
Debt Instrument [Line Items]      
Current interest rate 1.60%    
Maximum borrowing capacity $ 1,500,000,000 $ 1,200,000,000  
Facility fee 0.20%    
Unsecured revolving credit facilities | Unsecured Revolving Credit Facility Due 2022 | LIBOR      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate 1.30%    
USD unsecured term loan      
Debt Instrument [Line Items]      
Long-term debt, gross $ 3,546,179,000   3,519,853,000
USD unsecured term loan | Minimum      
Debt Instrument [Line Items]      
Interest rate 1.55%    
USD unsecured term loan | Maximum      
Debt Instrument [Line Items]      
Interest rate 4.05%    
Euro unsecured term loan      
Debt Instrument [Line Items]      
Long-term debt, gross $ 644,169,000   676,740,000
Euro unsecured term loan | Minimum      
Debt Instrument [Line Items]      
Interest rate 1.15%    
Euro unsecured term loan | Maximum      
Debt Instrument [Line Items]      
Interest rate 1.58%    
Finance lease liabilities      
Debt Instrument [Line Items]      
Long-term debt, gross $ 218,302,000   $ 230,258,000
[1] At June 30, 2020 and December 31, 2019, the weighted average interest rate for total debt was 5.68% and 3.99%, respectively.
[2] Interest rates based on outstanding loan balance as of June 30, 2020 and, for variable rate debt, include either LIBOR or EURIBOR plus the applicable margin.
[3] Includes $1.9 billion facility due in 2024 and $1.5 billion facility due in 2022, each of which accrue interest at LIBOR plus 1.30%, which interest rate was 1.60% as of June 30, 2020 and each is subject to a facility fee of 0.20%.