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Income taxes - Deferred tax variation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of deferred tax variation      
Opening balance $ (4,827) $ (5,622) $ (6,692)
Deferred tax on income (403) 455 387
Deferred tax on shareholders' equity 255 27 (490)
Changes in scope of consolidation and others (695) 151 1,154
Currency translation adjustment 28 162 19
Closing balance $ (5,642) $ (4,827) $ (5,622)