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Debt - Additional Information (Detail)
€ in Millions, SFr in Millions, $ in Millions, ¥ in Billions
1 Months Ended 3 Months Ended
Oct. 31, 2018
CHF (SFr)
Jul. 31, 2018
CHF (SFr)
Nov. 30, 2015
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
JPY (¥)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
EUR (€)
Mar. 31, 2018
EUR (€)
Feb. 28, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]                        
Senior notes           $ 28,483         $ 28,367  
Long term debt currency portion USD           63.00%            
Long term debt currency portion EUR           34.00%            
Long term debt currency portion CHF           3.00%            
Netherlands II B.V. [Member]                        
Debt Instrument [Line Items]                        
Senior notes | €                 € 1,600      
Netherlands III B.V. [Member]                        
Debt Instrument [Line Items]                        
Senior notes       $ 2,500                
Senior notes CHF 450 million [Member]                        
Debt Instrument [Line Items]                        
Senior notes                     461  
Weighted average interest rate 1.50%         1.50%            
Repayments of debt | SFr SFr 450                      
Senior notes CHF 300 million [Member]                        
Debt Instrument [Line Items]                        
Senior notes                     308  
Weighted average interest rate   0.13%       0.13%            
Repayments of debt | SFr   SFr 300                    
Senior notes USD 1,500 million [Member]                        
Debt Instrument [Line Items]                        
Senior notes                     1,500  
Debt instrument redeemed amount       $ 1,500                
Weighted average interest rate       1.40%   1.40%     1.40%      
Senior notes EUR 1,000 million [Member]                        
Debt Instrument [Line Items]                        
Senior notes                     1,199  
Debt instrument redeemed amount | €                 € 1,000      
Weighted average interest rate       2.88%   2.88%     2.88%      
Term loan USD 2.5 billion [Member]                        
Debt Instrument [Line Items]                        
Repayments of debt       $ 2,300                
Term loan JPY 58.5 billion [Member]                        
Debt Instrument [Line Items]                        
Repayments of debt | ¥         ¥ 86.8              
Term loan JPY 28.3 billion [Member]                        
Debt Instrument [Line Items]                        
Repayments of short-term debt | ¥         28.3              
Term loan JPY 35 billion due 2018 and 2019 [Member]                        
Debt Instrument [Line Items]                        
Repayments of debt | ¥         ¥ 70.0              
Debentures USD 15 million [Member]                        
Debt Instrument [Line Items]                        
Weighted average interest rate           7.20%            
Senior notes       $ 15                
'Senior notes USD 1,700 million [Member]                        
Debt Instrument [Line Items]                        
Senior notes           $ 1,700         2,000  
Debt instrument redeemed amount             $ 300          
Weighted average interest rate           1.70% 1.70% 1.70%        
Senior notes EUR 1,660 million [Member]                        
Debt Instrument [Line Items]                        
Senior notes           $ 1,897         2,095  
Debt instrument redeemed amount | €               € 90        
Weighted average interest rate           0.38% 0.38% 0.38%        
Convertible Debt [Member]                        
Debt Instrument [Line Items]                        
Weighted average interest rate           0.25%            
Principal amount currently outstanding on the debt instruments           $ 514         $ 514  
Revolving Credit Facility [Member]                        
Debt Instrument [Line Items]                        
Revolving credit facility     $ 3,000     $ 3,000       $ 3,000   $ 4,500
Debt instrument term     5 years