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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.