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Pension and other benefits (Tables)
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost for Defined Benefit Pension Plans and Other Benefits
Net periodic benefit (recovery) cost for defined benefit pension plans and other benefits included the following components:        

For the three months ended June 30
PensionsOther benefitsTotal
(in millions of Canadian dollars)202420232024202320242023
Current service cost $21 $17 $3 $3 $24 $20 
Other components of net periodic benefit (recovery) cost:
Interest cost on benefit obligation117 122 6 6 123 128 
Expected return on plan assets(222)(221)— — (222)(221)
Recognized net actuarial loss10 8 — — 10 8 
Amortization of prior service costs1 1 — 1 1 2 
Total other components of net periodic benefit (recovery) cost(94)(90)6 7 (88)(83)
Net periodic benefit (recovery) cost$(73)$(73)$9 $10 $(64)$(63)
For the six months ended June 30
PensionsOther benefitsTotal
(in millions of Canadian dollars)202420232024202320242023
Current service cost $42 $35 $6 $5 $48 $40 
Other components of net periodic benefit (recovery) cost:
Interest cost on benefit obligation234 243 12 11 246 254 
Expected return on plan assets(445)(441)— — (445)(441)
Recognized net actuarial loss20 16 — — 20 16 
Amortization of prior service costs3 1 — 1 3 2 
Total other components of net periodic benefit (recovery) cost(188)(181)12 12 (176)(169)
Net periodic benefit (recovery) cost$(146)$(146)$18 $17 $(128)$(129)