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Debt - Narrative (Details)
£ in Millions, € in Billions
3 Months Ended 6 Months Ended
Feb. 28, 2021
USD ($)
May 31, 2021
USD ($)
Feb. 28, 2021
EUR (€)
Feb. 28, 2021
GBP (£)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]          
Debt instrument, convertible, conversion ratio   3.0      
Debt instrument, convertible, equity component minimum threshold $ 5,000,000,000.0 $ 5,000,000,000.0      
Debt instrument, convertible, maximum threshold debt to capital (percent)   65.00%      
Debt instrument, convertible, liquidity component minimum threshold $ 1,000,000,000.0        
February 28, 2023 and May 31, 2023 testing dates          
Debt Instrument [Line Items]          
Debt instrument, debt covenant, required interest coverage covenant, ratio 2.0        
August 31, 2023 and November 30, 2023 testing dates          
Debt Instrument [Line Items]          
Debt instrument, debt covenant, required interest coverage covenant, ratio 2.5        
February 28, 2024 testing date onwards          
Debt Instrument [Line Items]          
Debt instrument, debt covenant, required interest coverage covenant, ratio 3.0        
Before November 30, 2021 testing date          
Debt Instrument [Line Items]          
Debt instrument, debt covenant, required debt to capital covenant (percent) 65.00%        
November 30, 2021 until May 31, 2023 test date          
Debt Instrument [Line Items]          
Debt instrument, debt covenant, required debt to capital covenant (percent) 75.00%        
May 31, 2024 testing date onwards          
Debt Instrument [Line Items]          
Debt instrument, debt covenant, required debt to capital covenant (percent) 65.00%        
Export credit facility | Export Credit Facility due 2032          
Debt Instrument [Line Items]          
Debt instrument, face amount         $ 1,500,000,000
Unsecured Debt | Senior Unsecured Term Loan Facility due 2027          
Debt Instrument [Line Items]          
Debt instrument, face amount $ 3,500,000,000        
Debt instrument, interest rate (percent) 5.80%   5.80% 5.80%  
Unsecured Debt | Revolver Facility Expires August 2024          
Debt Instrument [Line Items]          
Line of credit $ 3,100,000,000 $ 3,100,000,000      
Unsecured Debt | Revolving Credit Facility, Multi-currency, U.S. Dollar-denominated          
Debt Instrument [Line Items]          
Line of credit $ 1,700,000,000        
Unsecured Debt | Revolving Credit Facility, Multi-currency, Euro-denominated          
Debt Instrument [Line Items]          
Line of credit | €     € 1.0    
Unsecured Debt | Revolving Credit Facility, Multi-currency, Sterling-denominated          
Debt Instrument [Line Items]          
Line of credit | £       £ 150