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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

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- Definition The amount of current borrowings and current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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