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Borrowings and other financial liabilities - Summary of borrowings and other financial liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of borrowings and other financial liabilities [Line Items]    
Borrowings and other financial liabilities $ 13,341 $ 12,847
Total other current financial liabilities 1,372 1,073
Total other financial liabilities 247 666
Non-current portion of non-current borrowings 13,093 12,440
Current borrowings 1,022 312
Borrowings 14,115 12,752
Current borrowings and current portion of non-current borrowings 1,372 1,073
Borrowings and other financial liabilities 14,713 13,920
Derivative financial instruments [Member]    
Disclosure of borrowings and other financial liabilities [Line Items]    
Borrowings and other financial liabilities 248 407
Total other current financial liabilities 103 95
Total other financial liabilities 351 502
Other financial liabilities [Member]    
Disclosure of borrowings and other financial liabilities [Line Items]    
Borrowings and other financial liabilities 0 0
Total other current financial liabilities 247 666
Total other financial liabilities 247 666
Net Other Financial Liabilities [Member]    
Disclosure of borrowings and other financial liabilities [Line Items]    
Borrowings and other financial liabilities 248 407
Total other current financial liabilities 350 761
Total other financial liabilities $ 598 $ 1,168