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Discontinued operations - Narratives (Details) - MDA business - Discontinued operations
$ in Millions, $ in Billions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Apr. 08, 2020
USD ($)
Apr. 08, 2020
CAD ($)
Discontinued Operations        
Aggregate purchase price     $ 729 $ 1.0
Gain on disposal of discontinued operations, net of tax   $ 317    
Tax on gain on disposal of discontinued operations   $ 12    
Accrued Liabilities        
Discontinued Operations        
Recovery of previously recorded liability from dispute $ 39