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Variable Interest Entities (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
CAD ($)
Variable Interest Entity [Line Items]  
Future minimum lease payments before tax $ 485
Variable Interest Entity [Member]  
Variable Interest Entity [Line Items]  
Lease payments after tax 16
Future minimum lease payments before tax $ 169
Period over which lease payments will be paid 12 years