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intangible assets and goodwill - Business acquisitions - Prior period (Details) - Business that is complimentary to existing lines
$ in Millions
12 Months Ended
Dec. 31, 2020
CAD ($)
Business acquisition  
Increase (decrease) in software $ 32
Increase (decrease) in other intangible assets 2
Increase (decrease) in goodwill (24)
Increase (decrease) in deferred income taxes $ 10