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Discontinued operations - Narratives (Details)
$ in Millions, $ in Billions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Apr. 08, 2020
USD ($)
Apr. 08, 2020
CAD ($)
Discontinued Operations        
Gain on disposal of discontinued operations, net of tax $ 304 $ 304    
Reclassification of currency translation adjustment to gain on disposal of discontinued operations (64) (64)    
MDA business | Discontinued operations        
Discontinued Operations        
Aggregate purchase price     $ 729 $ 1.0
Gain on disposal of discontinued operations, net of tax 304 304    
Tax on gain on disposal of discontinued operations 25      
Reclassification of currency translation adjustment to gain on disposal of discontinued operations $ 64      
MDA business | Discontinued operations | Accrued Liabilities        
Discontinued Operations        
Recovery of previously recorded liability from dispute   $ 39