v3.24.2.u1
employee future benefits - Defined benefit pension plans - summary (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Other comprehensive income          
Discount rate used to determine defined benefit obligations 4.97%   4.97%   4.65%
Total $ (22) $ (5) $ (69) $ 1  
Effect of asset ceiling limit          
Other comprehensive income          
Changes in the effect of limiting net defined benefit plan assets to the asset ceiling     1,188   $ 914
Pension plans | Pension plan | Present value of the defined benefit obligations          
Employee benefits expense          
Benefits earned for current service (20) (20) (40) (38)  
Benefits earned for past service (1)   (1)    
Total (21) (20) (41) (38)  
Financing costs          
Notional income on plan assets and interest on defined benefit obligations accrued (96) (100) (193) (200)  
Total (96) (100) (193) (200)  
Other comprehensive income          
Changes in plan financial assumptions 92 (9) 327 (200)  
Total 92 (9) 327 (200)  
AMOUNTS INCLUDED IN OPERATING ACTIVITIES CASH FLOWS          
BENEFITS PAID BY PLANS     234 234  
PLAN ACCOUNT BALANCES          
Change in period     327 (204)  
Balance at beginning of period     (8,489) (8,075) (8,075)
Balance at end of period (8,162) (8,279) (8,162) (8,279) (8,489)
Pension plans | Pension plan | Present value of the defined benefit obligations | Pension plans that have plan assets in excess of defined benefit obligations accrued          
PLAN ACCOUNT BALANCES          
Balance at end of period (7,740) (7,042) (7,740) (7,042)  
Pension plans | Pension plan | Present value of the defined benefit obligations | Pension plans that have defined benefit obligations accrued in excess of plan assets          
PLAN ACCOUNT BALANCES          
Balance at end of period (422) (1,237) (422) (1,237)  
Pension plans | Pension plan | Present value of the defined benefit obligations | Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded          
PLAN ACCOUNT BALANCES          
Balance at end of period (210) (1,029) (210) (1,029)  
Pension plans | Pension plan | Present value of the defined benefit obligations | Pension plans that have defined benefit obligations accrued in excess of plan assets - Unfunded          
PLAN ACCOUNT BALANCES          
Balance at end of period (212) (208) (212) (208)  
Pension plans | Pension plan | Plan assets          
Employee benefits expense          
Employees' contributions 5 5 9 9  
Administrative fees (1) (1) (2) (2)  
Total 4 4 7 7  
Financing costs          
Notional income on plan assets and interest on defined benefit obligations accrued 105 109 210 219  
Interest effect on asset ceiling limit (11) (11) (21) (23)  
Total 94 98 189 196  
Other comprehensive income          
Plan assets - Difference between actual results and estimated plan assumptions (3) 8 (5) 234  
Changes in the effect of limiting net defined benefit plan assets to the asset ceiling (67) 6 (253) (35)  
Total (70) 14 (258) 199  
AMOUNTS INCLUDED IN OPERATING ACTIVITIES CASH FLOWS          
Employer contributions     14 16  
BENEFITS PAID BY PLANS     (234) (234)  
PLAN ACCOUNT BALANCES          
Change in period     (282) 184  
Balance at beginning of period     8,352 7,990 7,990
Balance at end of period 8,070 8,174 8,070 8,174 8,352
Pension plans | Pension plan | Plan assets | Pension plans that have plan assets in excess of defined benefit obligations accrued          
PLAN ACCOUNT BALANCES          
Balance at end of period 8,061 7,349 8,061 7,349  
Pension plans | Pension plan | Plan assets | Pension plans that have defined benefit obligations accrued in excess of plan assets          
PLAN ACCOUNT BALANCES          
Balance at end of period 9 825 9 825  
Pension plans | Pension plan | Plan assets | Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded          
PLAN ACCOUNT BALANCES          
Balance at end of period 9 825 9 825  
Pension plans | Pension plan | Net          
Employee benefits expense          
Total (17) (16) (34) (31)  
Financing costs          
Total (2) (2) (4) (4)  
DEFINED BENEFIT (COST) INCLUDED IN NET INCOME (19) (18) (38) (35)  
Other comprehensive income          
Total 22 5 69 (1)  
DEFINED BENEFIT (COST) INCLUDED IN COMPREHENSIVE INCOME 3 (13) 31 (36)  
AMOUNTS INCLUDED IN OPERATING ACTIVITIES CASH FLOWS          
Employer contributions     14 16  
PLAN ACCOUNT BALANCES          
Change in period     45 (20)  
Balance at beginning of period     (137) (85) (85)
Balance at end of period (92) (105) (92) (105) $ (137)
Pension plans | Pension plan | Net | Pension plans that have plan assets in excess of defined benefit obligations accrued          
PLAN ACCOUNT BALANCES          
Balance at end of period 321 307 321 307  
Pension plans | Pension plan | Net | Pension plans that have defined benefit obligations accrued in excess of plan assets          
PLAN ACCOUNT BALANCES          
Balance at end of period (413) (412) (413) (412)  
Pension plans | Pension plan | Net | Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded          
PLAN ACCOUNT BALANCES          
Balance at end of period (201) (204) (201) (204)  
Pension plans | Pension plan | Net | Pension plans that have defined benefit obligations accrued in excess of plan assets - Unfunded          
PLAN ACCOUNT BALANCES          
Balance at end of period $ (212) $ (208) $ (212) $ (208)