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Financial Instruments - Schedule of Consolidated Long-Term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings $ 9,160 $ 9,303
Bank loans [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings 2,649  
Notes payable [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings 6,511  
Later Than One Year and Not Later Than Two Years [Member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings 186  
Later Than One Year and Not Later Than Two Years [Member] | Bank loans [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings 180  
Later Than One Year and Not Later Than Two Years [Member] | Notes payable [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings 6  
Later Than Two Years and Not Later Than Three Years [Member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings 772  
Later Than Two Years and Not Later Than Three Years [Member] | Bank loans [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings 766  
Later Than Two Years and Not Later Than Three Years [Member] | Notes payable [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings 6  
Later Than Three Years and Not Later Than Four Years [Member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings 1,399  
Later Than Three Years and Not Later Than Four Years [Member] | Bank loans [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings 603  
Later Than Three Years and Not Later Than Four Years [Member] | Notes payable [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings 796  
Later Than Four Years and Not Later Than Five Years [Member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings 2,326  
Later Than Four Years and Not Later Than Five Years [Member] | Bank loans [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings 1,100  
Later Than Four Years and Not Later Than Five Years [Member] | Notes payable [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings 1,226  
More than 5 Years [Member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings 4,477  
More than 5 Years [Member] | Notes payable [member]    
Disclosure of detailed information about financial instruments [line items]    
Long term borrowings $ 4,477