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Debt - Note Issuances (Details) - Nov. 30, 2018
USD ($)
EUR (€)
GBP (£)
Total $6.0 billion debt issuance      
Debt Instrument [Line Items]      
Face amount $ 6,000,000,000    
Fair value of the notes 2,300,000,000    
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 6,300,000,000    
Carrying value of the notes 6,500,000,000    
Total 700 million pounds debt issuance      
Debt Instrument [Line Items]      
Face amount | £     £ 700,000,000.0
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 | €   € 750,000,000.00  
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 1,600,000,000    
Carrying value of the notes 1,700,000,000    
Total $1.0 billion debt issuance      
Debt Instrument [Line Items]      
Face amount 1,000,000,000    
Fair value of the notes 300,000,000    
Carrying value of the notes $ 200,000,000