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Accounting Changes Accounting Changes (Tables)
 9 Months Ended
Sep. 30, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]  
Reclassification Impacts of ASU 2017-07 The impacts of the reclassification are detailed as follows:
 
For the three months ended September 30
For the nine months ended September 30
Year ended December 31(1)
(in millions of Canadian dollars)
2017
2016
2017
2016
2017
2016
Decrease in operating income
$
68

$
41

$
203

$
127

$
272

$
167

(1) December 31, 2017 figure is an estimate.