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Debt Obligations - Schedule of Senior Notes and Loans (Parenthetical) (Detail) - Sep. 30, 2019
€ in Millions, SFr in Millions, $ in Millions
EUR (€)
CHF (SFr)
USD ($)
Senior notes EUR 1,660 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount | € € 1,660    
Senior notes EUR 1,500 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount | € 1,500    
Senior notes EUR 1,300 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount | € 1,300    
Senior notes EUR 900 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount | € 900    
Senior notes EUR 750 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount | € 750    
Senior notes EUR 700 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount | € 700    
Senior notes EUR 700 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount | € € 700    
Senior notes USD 3,500 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount     $ 3,500
Senior notes USD 3,000 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount     3,000
Senior notes USD 3,000 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount     3,000
Senior notes USD 1,556 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount     1,556
Senior notes USD 2,000 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount     2,000
Senior notes USD 1,250 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount     1,250
Senior notes USD 1,250 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount     1,250
Senior notes USD 844 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount     844
Senior notes USD 789 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount     789
Senior notes USD 700 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount     700
Senior notes USD 613 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount     613
Senior notes USD 588 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount     $ 588
Senior notes CHF 350 Million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount | SFr   SFr 350  
Senior notes CHF 350 Million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount | SFr   SFr 350