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Accounting Changes Accounting Changes (Tables)
6 Months Ended
Jun. 30, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]  
Reclassification Impacts of ASU 2017-07
 
For the three months ended June 30
For the six months ended June 30
Year ended December 31(1)
(in millions of Canadian dollars)
2017
2016
2017
2016
2017
2016
Decrease in operating income
68

43

135

86

272

167

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