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Debt - Note Issuances (Details)
May 31, 2020
USD ($)
May 31, 2020
GBP (£)
May 31, 2020
EUR (€)
Apr. 15, 2020
USD ($)
Total $1.5 billion debt issuance        
Debt Instrument [Line Items]        
Face amount $ 1,500,000,000     $ 1,500,000,000
Fair value of the notes 1,500,000,000      
Carrying value of the notes 1,500,000,000      
Total $6.0 billion debt issuance        
Debt Instrument [Line Items]        
Face amount 6,000,000,000      
Fair value of the notes 2,600,000,000      
Carrying value of the notes 2,500,000,000      
Total $8.0 billion debt issuance        
Debt Instrument [Line Items]        
Face amount 8,000,000,000      
Fair value of the notes 5,600,000,000      
Carrying value of the notes 5,200,000,000      
Total 700 million pounds debt issuance        
Debt Instrument [Line Items]        
Face amount | £   £ 700,000,000    
Fair value of the notes 900,000,000      
Carrying value of the notes 900,000,000      
Total 750 million euros debt issuance        
Debt Instrument [Line Items]        
Face amount | €     € 750,000,000  
Fair value of the notes 900,000,000      
Carrying value of the notes 800,000,000      
Total $4.0 billion debt issuance        
Debt Instrument [Line Items]        
Face amount 4,000,000,000      
Fair value of the notes 1,800,000,000      
Carrying value of the notes $ 1,700,000,000