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Financial Instruments - Summary of Other Financial Obligations (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of financial liabilities [line items] |  |
Other financial obligations, short-term | $ 879 | $ 1,381
Other financial obligations, long-term | 967 | 1,044
Total | 1,846 | 2,425
Convertible Subordinated Notes Due 2020 [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other financial obligations, short-term |  | 520
Total |  | 520
Liabilities Secured With Accounts Receivable [member] |  |
Disclosure of financial liabilities [line items] |  |
Other financial obligations, short-term | 586 | 599
Total | 586 | 599
Leases [Member] |  |
Disclosure of financial liabilities [line items] |  |
Other financial obligations, short-term | 293 | 262
Other financial obligations, long-term | 967 | 1,044
Total | $ 1,260 | $ 1,306

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