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Debt - Additional Information (Detail)
€ in Millions, SFr in Millions, $ in Millions, ¥ in Billions
1 Months Ended 3 Months Ended
Jul. 31, 2018
CHF (SFr)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
JPY (¥)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
EUR (€)
Sep. 30, 2018
JPY (¥)
Sep. 30, 2018
CHF (SFr)
Mar. 31, 2018
EUR (€)
Mar. 31, 2018
JPY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
JPY (¥)
Debt Instrument [Line Items]                      
Senior notes       $ 29,054           $ 28,367  
Short-term debt       $ 2,158           2,880  
Long term debt currency portion USD       63.00% 63.00% 63.00% 63.00%        
Long term debt currency portion EUR       34.00% 34.00% 34.00% 34.00%        
Long term debt currency portion CHF       3.00% 3.00% 3.00% 3.00%        
Netherlands II B.V. [Member]                      
Debt Instrument [Line Items]                      
Senior notes   $ 2,500           € 1,600      
Senior notes USD 1,500 million [Member]                      
Debt Instrument [Line Items]                      
Senior notes                   1,500  
Debt instrument face amount   1,500   $ 1,500              
Senior notes EUR 1,000 million [Member]                      
Debt Instrument [Line Items]                      
Senior notes                   1,199  
Debt instrument face amount | €         € 1,000     € 1,000      
Term Loan Facility [Member]                      
Debt Instrument [Line Items]                      
Repayment of debt   2,300                  
Term loan JPY 58.5 billion [Member]                      
Debt Instrument [Line Items]                      
Debt instrument face amount | ¥           ¥ 58.5          
Loan payment prepaid | ¥                 ¥ 86.8    
Short-term debt | ¥                     ¥ 28.3
Term loan JPY 35 billion due 2018 and 2019 [Member]                      
Debt Instrument [Line Items]                      
Repayment of debt | ¥     ¥ 70.0                
Debentures USD 15 million [Member]                      
Debt Instrument [Line Items]                      
Debt instrument face amount       15              
Loan payment prepaid   $ 15                  
Senior notes CHF 300 million [Member]                      
Debt Instrument [Line Items]                      
Senior notes                   308  
Debt instrument face amount | SFr             SFr 300        
Repayment of debt | SFr SFr 300                    
'Senior notes USD 2,000 million [Member]                      
Debt Instrument [Line Items]                      
Senior notes       1,700           2,000  
Debt instrument face amount       1,700              
Debt instrument redeemed amount       300              
'Senior notes EUR 1,750 million [Member]                      
Debt Instrument [Line Items]                      
Senior notes       1,924           $ 2,095  
Debt instrument face amount | €         1,660            
Debt instrument redeemed amount | €         € 90            
Revolving Credit Facility [Member]                      
Debt Instrument [Line Items]                      
Revolving credit facility       $ 3,000