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Financing (Outstanding Financing Facilities) (Details) - USD ($)
$ in Thousands
Oct. 14, 2020
Sep. 30, 2020
Sep. 09, 2020
Mar. 25, 2020
Dec. 31, 2019
Financing          
Senior notes, principal amount   $ 4,650,000     $ 3,911,000
Less: Unamortized discount and debt issuance costs   27,793     20,473
Total debt   4,622,207     3,890,527
Less: Current portion of long-term debt   499,783     0 [1]
Total long-term debt   4,122,424     3,890,527 [1]
4.875% Senior Notes due 2021 [Member]          
Financing          
Senior notes, principal amount   $ 500,000     $ 500,000
Interest rate of senior notes 4.875% 4.875%     4.875%
Senior notes, effective interest rate   4.946%      
4.625% Senior Notes due 2021 [Member]          
Financing          
Senior notes, principal amount   $ 300,000     $ 300,000
Interest rate of senior notes   4.625%     4.625%
Senior notes, effective interest rate   4.643%      
3.800% Senior Notes due 2022 [Member]          
Financing          
Senior notes, principal amount   $ 300,000     $ 300,000
Interest rate of senior notes   3.80%     3.80%
Senior notes, effective interest rate   3.845%      
3.850% Senior Notes due 2023 [Member]          
Financing          
Senior notes, principal amount   $ 300,000     $ 300,000
Interest rate of senior notes   3.85%     3.85%
Senior notes, effective interest rate   3.851%      
3.550% Senior Notes due 2026 [Member]          
Financing          
Senior notes, principal amount   $ 500,000     $ 500,000
Interest rate of senior notes   3.55%     3.55%
Senior notes, effective interest rate   3.57%      
3.600% Senior Notes due 2027 [Member]          
Financing          
Senior notes, principal amount   $ 750,000     $ 750,000
Interest rate of senior notes   3.60%     3.60%
Senior notes, effective interest rate   3.619%      
4.350% Senior Notes due 2028 [Member]          
Financing          
Senior notes, principal amount   $ 500,000     $ 500,000
Interest rate of senior notes   4.35%     4.35%
Senior notes, effective interest rate   4.383%      
3.900% Senior Notes due 2029 [Member]          
Financing          
Senior notes, principal amount   $ 500,000     $ 500,000
Interest rate of senior notes   3.90%     3.90%
Senior notes, effective interest rate   3.901%      
4.200% Senior Notes due 2030 [Member]          
Financing          
Senior notes, principal amount   $ 500,000   $ 500,000  
Interest rate of senior notes   4.20%   4.20%  
Senior notes, effective interest rate   4.205%      
1.750% Senior Notes due 2031 [Member]          
Financing          
Senior notes, principal amount   $ 500,000 $ 500,000    
Interest rate of senior notes   1.75% 1.75%    
Senior notes, effective interest rate   1.798%      
Revolving Credit Facility [Member]          
Financing          
Unsecured revolving credit facility   $ 0     $ 261,000
Senior notes [Member]          
Financing          
Senior notes, principal amount   $ 4,700,000      
[1] The balance sheet at December 31, 2019, has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by United States generally accepted accounting principles for complete financial statements.