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Debt - Note Issuances (Details) - Nov. 30, 2019
GBP (£)
EUR (€)
USD ($)
Total $6.0 billion debt issuance      
Debt Instrument [Line Items]      
Face amount     $ 6,000,000,000
Fair value of the notes     2,500,000,000
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     5,400,000,000
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     1,700,000,000
Carrying value of the notes     $ 1,700,000,000