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Financial risk management - D.5. Liquidity risk (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | [1] | Dec. 31, 2015 | [1]
--- | --- | --- | --- | --- | --- | --- | ---
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Debt and financing | $ (4,580) |  | $ (3,785) |  |  |
Cash and cash equivalents | 528 |  | 619 | [1] | $ 646 | $ 769
Pledged deposits (related to bank borrowings) | 2 |  | 1 |  |  |
Derivative financial liabilities | 0 |  | (56) |  |  |
Net cash (debt) including derivatives related to debt | (4,051) |  | (3,220) |  |  |
Trade payables (excluding accruals) | (26) |  | (25) |  |  |
Put Option liability | (239) |  | 0 | [2] |  |
Trade receivables | 343 | $ 339 | 386 |  |  |
Liquidity risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Debt and financing | (4,580) |  | (3,785) |  |  |
Cash and cash equivalents | 528 |  | 619 |  |  |
Pledged deposits (related to bank borrowings) | 2 |  | 1 |  |  |
Derivative financial liabilities | 0 |  | (56) |  |  |
Net cash (debt) including derivatives related to debt | (4,051) |  | (3,220) |  |  |
Future interest commitments | (1,111) |  | (1,108) |  |  |
Trade payables (excluding accruals) | (478) |  | (427) |  |  |
Other financial liabilities (including accruals) | (1,352) |  | (1,218) |  |  |
Put Option liability | (239) |  |  |  |  |
Trade receivables | 343 |  | 386 |  |  |
Other financial assets | 310 |  | 257 |  |  |
Net financial liabilities | (6,578) |  | (5,330) |  |  |
Liquidity risk | Less than 1 year |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Debt and financing | (458) |  | (185) |  |  |
Cash and cash equivalents | 528 |  | 619 |  |  |
Pledged deposits (related to bank borrowings) | 2 |  | 1 |  |  |
Derivative financial liabilities | 0 |  | (56) |  |  |
Net cash (debt) including derivatives related to debt | 72 |  | 380 |  |  |
Future interest commitments | (248) |  | (255) |  |  |
Trade payables (excluding accruals) | (478) |  | (427) |  |  |
Other financial liabilities (including accruals) | (1,217) |  | (1,094) |  |  |
Put Option liability | (239) |  |  |  |  |
Trade receivables | 343 |  | 386 |  |  |
Other financial assets | 184 |  | 144 |  |  |
Net financial liabilities | (1,583) |  | (866) |  |  |
Liquidity risk | 1 to 5 years |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Debt and financing | (1,778) |  | (1,862) |  |  |
Cash and cash equivalents | 0 |  | 0 |  |  |
Pledged deposits (related to bank borrowings) | 0 |  | 0 |  |  |
Derivative financial liabilities | 0 |  | 0 |  |  |
Net cash (debt) including derivatives related to debt | (1,778) |  | (1,862) |  |  |
Future interest commitments | (786) |  | (785) |  |  |
Trade payables (excluding accruals) | 0 |  | 0 |  |  |
Other financial liabilities (including accruals) | (135) |  | (124) |  |  |
Put Option liability | 0 |  |  |  |  |
Trade receivables | 0 |  | 0 |  |  |
Other financial assets | 126 |  | 113 |  |  |
Net financial liabilities | (2,573) |  | (2,658) |  |  |
Liquidity risk | Greater than 5 years |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Debt and financing | (2,345) |  | (1,738) |  |  |
Cash and cash equivalents | 0 |  | 0 |  |  |
Pledged deposits (related to bank borrowings) | 0 |  | 0 |  |  |
Derivative financial liabilities | 0 |  | 0 |  |  |
Net cash (debt) including derivatives related to debt | (2,345) |  | (1,738) |  |  |
Future interest commitments | (77) |  | (68) |  |  |
Trade payables (excluding accruals) | 0 |  | 0 |  |  |
Other financial liabilities (including accruals) | 0 |  | 0 |  |  |
Put Option liability | 0 |  |  |  |  |
Trade receivables | 0 |  | 0 |  |  |
Other financial assets | 0 |  | 0 |  |  |
Net financial liabilities | $ (2,422) |  | $ (1,806) |  |  |
Commercial Banks | Liquidity risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Concentration risk percentage | 34.00% |  | 30.00% |  |  |
Bonds | Liquidity risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Concentration risk percentage | 54.00% |  | 57.00% |  |  |
Development Finance Institutions | Liquidity risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Concentration risk percentage | 4.00% |  | 3.00% |  |  |
Finance lease liabilities | Liquidity risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Concentration risk percentage | 8.00% |  | 10.00% |  |  |
[1] | Re-presented for discontinued operations (shown in note A.4. and E.3.2.). Not restated for the application of IFRS 15 and 9, as the Group elected the modified retrospective approach for both standards.
[2] | 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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