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Financial Instruments - Summary of Debt Summarized by Interest Rates and Currencies (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]        
Short- term $ 73 $ 179    
Long- term 7,306 9,160    
Total 7,379 9,339 $ 9,365 $ 9,311
Floating interest rate [member]        
Disclosure of detailed information about financial instruments [line items]        
Short- term 27 172    
Long- term 896 2,538    
Total $ 923 $ 2,710    
Short-term 2.70% 3.10%    
Long-term 2.60% 4.00%    
Fixed interest rate [member]        
Disclosure of detailed information about financial instruments [line items]        
Short- term $ 46 $ 7    
Long- term 6,410 6,622    
Total $ 6,456 $ 6,629    
Short-term 5.20% 4.70%    
Long-term 4.80% 5.60%    
US Dollar [member]        
Disclosure of detailed information about financial instruments [line items]        
Short- term $ 6 $ 6    
Long- term 6,375 6,089    
Total $ 6,381 $ 6,095    
Effective rate 4.40% 5.80%    
Euro [member]        
Disclosure of detailed information about financial instruments [line items]        
Short- term $ 1 $ 73    
Long- term 453 2,078    
Total $ 454 $ 2,151    
Effective rate 3.10% 2.70%    
British Pound Sterling [member]        
Disclosure of detailed information about financial instruments [line items]        
Short- term   $ 55    
Long- term   329    
Total   $ 384    
Effective rate   2.50%    
Philippine pesos [member]        
Disclosure of detailed information about financial instruments [line items]        
Short- term $ 66 $ 3    
Long- term 109 220    
Total $ 175 $ 223    
Effective rate 4.40% 4.10%    
Mexican pesos [member]        
Disclosure of detailed information about financial instruments [line items]        
Long- term $ 254 $ 334    
Total $ 254 $ 334    
Effective rate 7.20% 6.80%    
Other Currencies [Member]        
Disclosure of detailed information about financial instruments [line items]        
Short- term   $ 42    
Long- term $ 115 110    
Total $ 115 $ 152    
Effective rate 4.10% 4.90%