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Consolidated net debt - Analysis of changes in consolidated net cash/(debt) footnotes (Detail) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | --- | ---
Disclosure of financial liabilities [Abstract] |  |  |
Borrowings | $ 12,604 | $ 12,806 |
Borrowings and other financial liabilities | 14,118 | 14,713 |
Bank overdrafts | 15 | 0 | $ 3
Total other current financial liabilities | 645 | 1,372 |
Other non-current financial liabilities | 13,473 | 13,341 |
Borrowings Excluding Overdrafts, Including Lease Liabilities |  |  |
Disclosure of financial liabilities [Abstract] |  |  |
Borrowings | 13,764 | 14,115 |
Overdraft |  |  |
Disclosure of financial liabilities [Abstract] |  |  |
Bank overdrafts | 15 | 0 |
Net Other Financial Liabilities |  |  |
Disclosure of financial liabilities [Abstract] |  |  |
Total other current financial liabilities | 57 | 350 |
Other non-current financial liabilities | $ 282 | $ 248 |

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