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Financial risk management - D.1.2. Interest rate swap contracts (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2018 | Jun. 30, 2013 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Cash payment for settlement of derivative |  |  | $ 63 | $ 0 | [1] | $ 0 | [1]
Loss on change in fair value of derivative |  |  | $ 1 | 22 |  | $ (3) |
Interest rate swap | Interest rate risk |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Derivative term |  | 7 years |  |  |  |  |
Derivative notional amount |  | $ 134 |  |  |  |  |
Loss on change in fair value of derivative |  |  |  | 22 |  |  |
Interest rate swap | Luxembourg (SEK denominated) | Interest rate risk |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Cash payment for settlement of derivative | $ 63 |  |  | $ 10 |  |  |
[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.

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