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Accounting Changes Accounting Changes (Tables)
 12 Months Ended
Dec. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]  
Reclassification Impact of ASU 2017-07 The impacts of the reclassification are detailed as follows:
 
Year ended December 31
(in millions of Canadian dollars)
2017
2016
2015
Decrease in operating income
$
274

$
167

$
70