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Financial Instruments - Summary of Carrying Amounts and Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financial assets |  |
Derivative instruments | $ 3 | $ 2
Other investments and non-current accounts receivable | 272 | 234
Other investments and non-current accounts receivable | 275 | 236
Financial liabilities |  |
Long-term debt | 9,160 | 9,303
Other financial obligations | 967 | 1,044
Derivative instruments | 53 | 46
Total financial liabilities | 10,180 | 10,393
At Fair Value [Member] |  |
Financial assets |  |
Derivative instruments | 3 | 2
Other investments and non-current accounts receivable | 272 | 234
Other investments and non-current accounts receivable | 275 | 236
Financial liabilities |  |
Long-term debt | 9,687 | 9,711
Other financial obligations | 1,012 | 1,071
Derivative instruments | 53 | 46
Total financial liabilities | $ 10,752 | $ 10,828

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