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Right-of-use assets and Lease liabilities - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Apr. 02, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of finance lease and operating lease by lessee [line items]          
Financial debts $ 3,522 $ 3,522 $ 3,500   $ 47
Property, plant & equipment 2,887 2,887     2,800
Lease liabilities 273 273   $ 286  
Right-of-use assets 266 266   $ 279 79
Depreciation, right-of-use assets 15 29      
Additions to right-of-use assets   16      
Current lease liabilities 53 53     0
Non-current lease liabilities 220 220     89
Interest expense on lease liabilities 3 5      
Total cash outflows for leases $ 12 $ 24      
Previously stated [member]          
Disclosure of finance lease and operating lease by lessee [line items]          
Financial debts         89
Property, plant & equipment         $ 79