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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
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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

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