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Income taxes - Deferred tax variation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of deferred tax variation      
Opening balance $ (5,642) $ (4,827) $ (5,622)
Deferred tax on income 2,132 (403) 455
Deferred tax on shareholders' equity 137 255 27
Changes in scope of consolidation and others 76 (695) 151
Currency translation adjustment (13) 28 162
Closing balance $ (3,310) $ (5,642) $ (4,827)