XML 111 R60.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 8,599 $ 7,691
Funded Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation [1] 1,042 943
Accumulated benefit obligation [1] 942 852
Fair value of plan assets [1] 870 739
Accumulated benefit obligation less fair value of plan assets [1] 72 113
Unfunded Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 597 488
Accumulated benefit obligation $ 536 $ 451
[1] The amounts shown for funded pension plans with accumulated benefit obligations in excess of plan assets represent the company’s proportionate share of a joint venture sponsored pension plan. For the company sponsored funded plan, plan assets exceeded the accumulated benefit obligation in both 2019 and 2018.