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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