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Debt Obligations - Schedule of Senior Notes and Loans (Parenthetical) (Detail) - Mar. 31, 2019
€ in Millions, SFr in Millions, $ in Millions
USD ($)
EUR (€)
CHF (SFr)
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 1,700 million [Member]      
Debt Instrument [Line Items]      
Debt instrument face amount 1,574    
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