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Debt - Notes Issued Under Indentures Narrative (Details)
€ in Thousands, £ in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Aug. 21, 2020
USD ($)
Aug. 21, 2020
CAD ($)
Aug. 21, 2020
EUR (€)
Aug. 18, 2020
USD ($)
Jul. 02, 2020
USD ($)
Jun. 29, 2020
USD ($)
Jun. 22, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
GBP (£)
Debt Instrument [Line Items]                          
Debt (inclusive of discount)                   $ 8,797,424,000 $ 8,751,544,000    
Repurchase price in the event of change of control, percentage of principal plus accrued and unpaid interest                   101.00%     101.00%
Net proceeds from sales of senior notes                   $ 3,465,000,000 987,500,000 $ 0  
Loss on early extinguishment of debt                   $ 68,300,000 0 $ 0  
Senior Notes                          
Debt Instrument [Line Items]                          
Redemption price, percentage             100.00%     100.00%      
Net proceeds from sales of senior notes             $ 2,376,000,000            
Loss on early extinguishment of debt               $ 35,950,000 $ 17,040,000        
Senior Notes | GBP Notes                          
Debt Instrument [Line Items]                          
Debt (inclusive of discount) | £                         £ 400,000
Senior Notes | 47/8% Notes due 2027                          
Debt Instrument [Line Items]                          
Debt (inclusive of discount)                   $ 1,000,000,000      
Senior Notes | 51/4% Notes due 2028                          
Debt Instrument [Line Items]                          
Debt (inclusive of discount)                   825,000,000      
Principal Amount             1,300,000,000            
Senior Notes | 5% Notes                          
Debt Instrument [Line Items]                          
Debt (inclusive of discount)                   $ 500,000,000      
Principal Amount             500,000,000            
Stated interest rate (as a percent)                   5.00%     5.00%
Senior Notes | 47/8% Notes due 2029                          
Debt Instrument [Line Items]                          
Debt (inclusive of discount)                   $ 1,000,000,000      
Senior Notes | 51/4% Notes due 2030                          
Debt Instrument [Line Items]                          
Debt (inclusive of discount)                   1,300,000,000      
Senior Notes | 41/2% Notes                          
Debt Instrument [Line Items]                          
Debt (inclusive of discount)                   1,100,000,000      
Redemption price, percentage       100.00%                  
Principal Amount       $ 1,100,000,000                  
Net proceeds from sales of senior notes       $ 1,089,000,000                  
Senior Notes | 55/8% Notes                          
Debt Instrument [Line Items]                          
Debt (inclusive of discount)                   600,000,000      
Principal Amount             $ 600,000,000            
Senior Notes | Senior Notes 4.375 Percent due 2021                          
Debt Instrument [Line Items]                          
Debt (inclusive of discount)                   $ 0 500,000,000    
Redemption price, percentage           100.00%              
Stated interest rate (as a percent)                   4.375%     4.375%
Aggregate principal amount outstanding           $ 500,000,000              
Senior Notes | Senior Notes 6 Percent Due 2023                          
Debt Instrument [Line Items]                          
Debt (inclusive of discount)                   $ 0 600,000,000    
Redemption price, percentage           102.00%              
Stated interest rate (as a percent)           6.00%     6.00% 6.00%     6.00%
Aggregate principal amount outstanding           $ 600,000,000              
Senior Notes | Senior Subordinated Notes 5.75 Percent due 2024                          
Debt Instrument [Line Items]                          
Debt (inclusive of discount)                   $ 0 1,000,000,000    
Redemption price, percentage         100.958%                
Stated interest rate (as a percent)                   5.75%     5.75%
Aggregate principal amount outstanding         $ 1,000,000                
Loss on early extinguishment of debt               $ 15,310,000          
Senior Notes | Senior CAD Notes                          
Debt Instrument [Line Items]                          
Redemption price, percentage 104.031% 104.031% 104.031%                    
Aggregate principal amount outstanding   $ 250,000                      
Senior Notes | CAD 5.375 Percent Senior Notes due 2023                          
Debt Instrument [Line Items]                          
Debt (inclusive of discount)                   $ 0 $ 192,058,000    
Redemption price, percentage 106.628% 106.628% 106.628%                    
Stated interest rate (as a percent)                   5.375%     5.375%
Aggregate principal amount outstanding $ 250,000,000                        
Senior Notes | Senior Euro Notes                          
Debt Instrument [Line Items]                          
Redemption price, percentage 101.50% 101.50% 101.50%                    
Aggregate principal amount outstanding | €     € 300,000