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Financial Instruments - Summary of Consolidated Debt by Type of Instrument (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Current maturities $ (105) $ (55)
Short- term 105 55
Short-term debt 179 62
Long- term 9,160 9,303
Bank loans [member]    
Disclosure of detailed information about financial instruments [line items]    
Short- term 67 1
Long- term 2,754 3,155
Bank loans [member] | Loans in Foreign Countries [member]    
Disclosure of detailed information about financial instruments [line items]    
Short- term 67 1
Long- term 371 290
Bank loans [member] | Syndicated loans [member]    
Disclosure of detailed information about financial instruments [line items]    
Long- term 2,383 2,865
Notes payable [member]    
Disclosure of detailed information about financial instruments [line items]    
Short- term 7 6
Long- term 6,511 6,203
Notes payable [member] | Medium term notes [member]    
Disclosure of detailed information about financial instruments [line items]    
Long- term 6,327 6,044
Notes payable [member] | Other Notes Payable [member]    
Disclosure of detailed information about financial instruments [line items]    
Short- term 7 6
Long- term 184 159
Total bank loans and notes payables [member]    
Disclosure of detailed information about financial instruments [line items]    
Short- term 74 7
Long- term $ 9,265 $ 9,358
Bottom of range [member] | Bank loans [member] | Loans in Foreign Countries [member]    
Disclosure of detailed information about financial instruments [line items]    
Debt instrument maturity period 2021 2020
Bottom of range [member] | Bank loans [member] | Syndicated loans [member]    
Disclosure of detailed information about financial instruments [line items]    
Debt instrument maturity period 2021 2021
Bottom of range [member] | Notes payable [member] | Medium term notes [member]    
Disclosure of detailed information about financial instruments [line items]    
Debt instrument maturity period 2024 2023
Bottom of range [member] | Notes payable [member] | Other Notes Payable [member]    
Disclosure of detailed information about financial instruments [line items]    
Debt instrument maturity period 2021 2020
Top of range [member] | Bank loans [member] | Loans in Foreign Countries [member]    
Disclosure of detailed information about financial instruments [line items]    
Debt instrument maturity period 2024 2024
Top of range [member] | Bank loans [member] | Syndicated loans [member]    
Disclosure of detailed information about financial instruments [line items]    
Debt instrument maturity period 2025 2022
Top of range [member] | Notes payable [member] | Medium term notes [member]    
Disclosure of detailed information about financial instruments [line items]    
Debt instrument maturity period 2030 2026
Top of range [member] | Notes payable [member] | Other Notes Payable [member]    
Disclosure of detailed information about financial instruments [line items]    
Debt instrument maturity period 2027 2025