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Commitments and contingencies - Legal proceedings (Details) - Motor Oil MDL - Pending litigation - item
Mar. 21, 2019
Feb. 01, 2019
Jun. 02, 2016
Legal proceedings      
Number of nationwide classes   2 2
Subsequent event      
Legal proceedings      
Number of statewide classes regarding unjust enrichment 16    
Number of statewide classes regarding consumer protection laws 16