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Debt - Additional Information (Detail) - USD ($)
12 Months Ended
Nov. 29, 2017
Jun. 27, 2017
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Interest rate under multi currency facility     LIBOR, NIBOR or CDOR plus 1.125%  
Capitalization ratio, Maximum     60.00%  
Capitalization ratio, Actual     16.30%  
Funds available under revolving credit facility     $ 3,000,000,000  
Outstanding letters of credit under various bilateral letter of credit facilities     480,000,000  
Carrying value of Unsecured Senior Notes     2,482,000,000 $ 2,480,000,000
Fair Value, Inputs, Level 2 [Member] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Fair value of Unsecured Senior Notes     $ 2,211,000,000 $ 2,346,000,000
Senior Notes, Interest at 1.35% Payable Semiannually, Principal Due on December 1, 2017 [Member]        
Debt Instrument [Line Items]        
Repayment of debt $ 500,000,000      
Senior notes interest rate 1.35%      
Canadian Dollar Offered Rate (CDOR) [Member]        
Debt Instrument [Line Items]        
Variable rate   1.125%    
Five Year Unsecured Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Credit facility, borrowing capacity   $ 3,000,000,000    
Credit facility, maturity date     Jun. 27, 2022  
Credit facility, extendable borrowing capacity   4,000,000,000    
Variable rate basis     LIBOR, NIBOR or CDOR plus  
Previous Five Year Credit Facility [Member]        
Debt Instrument [Line Items]        
Credit facility, borrowing capacity   $ 4,500,000,000    
Unsecured Credit Facility [Member]        
Debt Instrument [Line Items]        
Credit facility, Period     5 years  
Five Year Credit Facility [Member]        
Debt Instrument [Line Items]        
Credit facility, borrowing capacity     $ 3,000,000,000  
Credit facility, Period     5 years  
Borrowings under commercial paper     $ 0  
Outstanding letters of credit issued     $ 0