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Financing (Senior Notes) (Narrative) (Details)
$ in Thousands
9 Months Ended
Oct. 14, 2020
USD ($)
Sep. 09, 2020
USD ($)
D
Mar. 25, 2020
USD ($)
D
Sep. 30, 2020
USD ($)
D
Dec. 31, 2019
USD ($)
Financing          
Face amount of senior notes       $ 4,650,000 $ 3,911,000
Senior notes [Member]          
Financing          
Face amount of senior notes       $ 4,700,000  
Number of days in annual interest calculation period | D       360  
Minimum [Member] | Senior notes [Member]          
Financing          
Interest rate of senior notes       1.75%  
Maximum [Member] | Senior notes [Member]          
Financing          
Interest rate of senior notes       4.875%  
4.200% Senior Notes due 2030 [Member]          
Financing          
Face amount of senior notes     $ 500,000 $ 500,000  
Interest rate of senior notes     4.20% 4.20%  
Percentage of face value of debt instrument     99.959%    
Number of days in annual interest calculation period | D     360    
1.750% Senior Notes due 2031 [Member]          
Financing          
Face amount of senior notes   $ 500,000   $ 500,000  
Interest rate of senior notes   1.75%   1.75%  
Percentage of face value of debt instrument   99.544%      
Number of days in annual interest calculation period | D   360      
4.875% Senior Notes due 2021 [Member]          
Financing          
Face amount of senior notes       $ 500,000 $ 500,000
Interest rate of senior notes 4.875%     4.875% 4.875%
Principal amount of debt redeemed $ 500,000        
Debt redemption price 500,000        
Loss on debt extinguishment $ 200