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Financial risk management - D.6. Capital management (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financial Instruments [Abstract] |  |  |  |
Net debt | $ 4,051 | $ 3,164 |  | $ 3,250
EBITDA | $ 1,254 | $ 1,278 |  |
Net debt to EBITDA (i) | 323.00% | 248.00% |  |
Equity | $ 2,542 | $ 3,096 | [1] |
Net debt and equity | $ 6,593 | $ 6,260 |  |
Gearing ratio | 61.00% | 51.00% |  |
[1] | Not restated for the application of IFRS 15 and 9, as the Group elected the modified retrospective approach for both standards.

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