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Debt Obligations - Schedule of Senior Notes and Loans (Parenthetical) (Detail)
€ in Millions, SFr in Millions, $ in Millions, ¥ in Billions
Sep. 30, 2018
USD ($)
Sep. 30, 2018
EUR (€)
Sep. 30, 2018
JPY (¥)
Sep. 30, 2018
CHF (SFr)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
EUR (€)
'Senior notes EUR 1,750 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 1,000 million [Member]            
Debt Instrument [Line Items]            
Debt instrument face amount | €   1,000       € 1,000
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 2,000 million [Member]            
Debt Instrument [Line Items]            
Debt instrument face amount 1,700          
Senior notes USD 2,000 million [Member]            
Debt Instrument [Line Items]            
Debt instrument face amount 2,000          
Senior notes USD 1,500 million [Member]            
Debt Instrument [Line Items]            
Debt instrument face amount 1,500       $ 1,500  
Senior notes USD 1250 million [Member]            
Debt Instrument [Line Items]            
Debt instrument face amount 1,250          
Senior notes USD 1250 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 450 million [Member]            
Debt Instrument [Line Items]            
Debt instrument face amount | SFr       SFr 450    
Senior notes CHF 350 million [Member]            
Debt Instrument [Line Items]            
Debt instrument face amount | SFr       350    
Senior notes CHF 350 million [Member]            
Debt Instrument [Line Items]            
Debt instrument face amount | SFr       350    
Senior notes CHF 300 million [Member]            
Debt Instrument [Line Items]            
Debt instrument face amount | SFr       SFr 300    
Term loan USD 2.5 billion [Member]            
Debt Instrument [Line Items]            
Debt instrument face amount 2,500          
Term loan USD 2.5 billion [Member]            
Debt Instrument [Line Items]            
Debt instrument face amount 2,500          
Term loan JPY 58.5 billion [Member]            
Debt Instrument [Line Items]            
Debt instrument face amount | ¥     ¥ 58.5      
Term loan JPY 35 billion [Member]            
Debt Instrument [Line Items]            
Debt instrument face amount | ¥     35.0      
Term loan JPY 35 billion [Member]            
Debt Instrument [Line Items]            
Debt instrument face amount | ¥     ¥ 35.0      
Debentures USD 15 million [Member]            
Debt Instrument [Line Items]            
Debt instrument face amount $ 15