Annual report pursuant to Section 13 and 15(d)

Short-term Borrowings - Narrative (Detail)

v3.6.0.2
Short-term Borrowings - Narrative (Detail)
12 Months Ended
Dec. 31, 2016
USD ($)
extension
Jun. 30, 2016
USD ($)
Jan. 02, 2016
USD ($)
Apr. 30, 2015
USD ($)
Short-term Debt [Line Items]        
Number of credit facility extensions | extension 2      
Extension period 1 year      
Restricted covenants 60.00%      
Commercial Paper        
Short-term Debt [Line Items]        
Credit facility amount outstanding $ 0   $ 423,000,000  
Global Credit Facility        
Short-term Debt [Line Items]        
Credit facility fee 7.00%      
Credit facility amount available for borrowing $ 2,230,000,000      
Global Credit Facility | Letter of Credit        
Short-term Debt [Line Items]        
Letter of credit sublimit   $ 50,000,000    
Global Credit Facility | LIBOR        
Short-term Debt [Line Items]        
Debt instrument basis spread on variable rate 80.50%      
International Lending Agreements        
Short-term Debt [Line Items]        
Debt capacity $ 120,100,000      
Credit facility amount outstanding $ 26,000,000   $ 26,600,000  
Weighted average interest rate of international bank borrowings 7.20%   6.00%  
Senior Unsecured | Global Credit Facility | Revolving Credit Facility        
Short-term Debt [Line Items]        
Debt capacity       $ 1,750,000,000
Senior Unsecured | Global Credit Facility | Letter of Credit        
Short-term Debt [Line Items]        
Debt capacity $ 16,100,000      
Senior Unsecured | Global Credit Facility | Commercial Paper        
Short-term Debt [Line Items]        
Debt capacity   $ 2,250,000,000.00