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Discontinued operations - Narratives (Details) - Discontinued operations
$ in Millions, $ in Billions
3 Months Ended
Dec. 29, 2019
CAD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 29, 2019
USD ($)
Discontinued Operations        
Costs and attorney fees awarded from other party   $ 2    
Accrued Liabilities        
Discontinued Operations        
Reserves for legal proceedings liabilities   21 $ 60  
Recovery of previously recorded liability from dispute   $ 39    
MDA business        
Discontinued Operations        
Aggregate purchase price $ 1.0     $ 729
Transition Services extension period 6 months