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Pension and other benefits
 6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Pension and other benefits Pension and other benefits
During the three and six months ended June 30, 2025, the Company made contributions to its defined benefit pension plans of $4 million and $8 million, respectively (three and six months ended June 30, 2024 - $2 million and $5 million, respectively).

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)202520242025202420252024
Current service cost $21 $21 $4 $3 $25 $24 
Other components of net periodic benefit (recovery) cost:
Interest cost on benefit obligation116 117 6 6 122 123 
Expected return on plan assets(231)(222)— — (231)(222)
Recognized net actuarial loss (gain)2 10 (1)— 1 10 
Amortization of prior service costs1 1 — — 1 1 
Total other components of net periodic benefit (recovery) cost(112)(94)5 6 (107)(88)
Net periodic benefit (recovery) cost$(91)$(73)$9 $9 $(82)$(64)

For the six months ended June 30
PensionsOther benefitsTotal
(in millions of Canadian dollars)202520242025202420252024
Current service cost $42 $42 $7 $6 $49 $48 
Other components of net periodic benefit (recovery) cost:
Interest cost on benefit obligation233 234 11 12 244 246 
Expected return on plan assets(463)(445)— — (463)(445)
Recognized net actuarial loss (gain)4 20 (1)— 3 20 
Amortization of prior service costs2 3 — — 2 3 
Total other components of net periodic benefit (recovery) cost(224)(188)10 12 (214)(176)
Net periodic benefit (recovery) cost$(182)$(146)$17 $18 $(165)$(128)