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Financial Instruments - Summary of Debt Summarized by Interest Rates and Currencies (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]        
Short- term $ 179 $ 62    
Long- term 9,160 9,303    
Total 9,339 9,365 $ 9,311 $ 9,873
Floating interest rate [member]        
Disclosure of detailed information about financial instruments [line items]        
Short- term 172 59    
Long- term 2,538 2,997    
Total $ 2,710 $ 3,056    
Short-term 3.10% 4.30%    
Long-term 4.00% 4.10%    
Fixed interest rate [member]        
Disclosure of detailed information about financial instruments [line items]        
Short- term $ 7 $ 3    
Long- term 6,622 6,306    
Total $ 6,629 $ 6,309    
Short-term 4.70% 5.20%    
Long-term 5.60% 5.50%    
US Dollar [member]        
Disclosure of detailed information about financial instruments [line items]        
Short- term $ 6 $ 25    
Long- term 6,089 6,144    
Total $ 6,095 $ 6,169    
Effective rate 5.80% 5.20%    
Euro [member]        
Disclosure of detailed information about financial instruments [line items]        
Short- term $ 73 $ 3    
Long- term 2,078 2,438    
Total $ 2,151 $ 2,441    
Effective rate 2.70% 3.10%    
Pounds [member]        
Disclosure of detailed information about financial instruments [line items]        
Short- term $ 55 $ 23    
Long- term 329 433    
Total $ 384 $ 456    
Effective rate 2.50% 3.20%    
Philippine pesos [member]        
Disclosure of detailed information about financial instruments [line items]        
Short- term $ 3 $ 3    
Long- term 220 221    
Total $ 223 $ 224    
Effective rate 4.10% 5.20%    
Mexican pesos [member]        
Disclosure of detailed information about financial instruments [line items]        
Long- term $ 334      
Total $ 334      
Effective rate 6.80%      
Other Currencies [Member]        
Disclosure of detailed information about financial instruments [line items]        
Short- term $ 42 $ 8    
Long- term 110 67    
Total $ 152 $ 75    
Effective rate 4.90% 5.60%