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Pension and other benefits
 3 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Pension and other benefits Pension and other benefits
In the three months ended March 31, 2024, the Company made contributions to its defined benefit pension plans of $3 million (three months ended March 31, 2023 - $4 million).
Net periodic benefit (recovery) cost for defined benefit pension plans and other benefits included the following components:        

For the three months ended March 31
PensionsOther benefitsTotal
(in millions of Canadian dollars)202420232024202320242023
Current service cost $21 $18 $3 $2 $24 $20 
Other components of net periodic benefit (recovery) cost:
Interest cost on benefit obligation117 121 6 5 123 126 
Expected return on plan assets(223)(220)— — (223)(220)
Recognized net actuarial loss10 8 — — 10 8 
Amortization of prior service costs2 — — — 2 — 
Total other components of net periodic benefit (recovery) cost(94)(91)6 5 (88)(86)
Net periodic benefit (recovery) cost$(73)$(73)$9 $7 $(64)$(66)