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Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - CAD
CAD in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at January 1     CAD (1,828) CAD (2,059)
Current period change excluding amounts reclassified from accumulated other comprehensive income     100 (176)
Amounts reclassified from accumulated other comprehensive income CAD 33 CAD 42 74 84
Balance at June 30 CAD (1,654) CAD (2,151) CAD (1,654) CAD (2,151)