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Employee Future Benefits - Fair Value of Plan Assets by Major Category (Details)
$ in Millions, $ in Millions
Dec. 31, 2024
CAD ($)
Jun. 30, 2024
CAD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
CAD ($)
Disclosure of fair value of plan assets [line items]        
Loans $ 1     $ 2
Alternative funds 46     44
Money market and cash and cash equivalents 23     21
Total 257 $ 23 $ 17 284
Canadian        
Disclosure of fair value of plan assets [line items]        
Equity securities 12     12
US        
Disclosure of fair value of plan assets [line items]        
Equity securities       6
International        
Disclosure of fair value of plan assets [line items]        
Equity securities 53     86
Private        
Disclosure of fair value of plan assets [line items]        
Equity securities 1     1
A - AAA        
Disclosure of fair value of plan assets [line items]        
Bonds 99     92
BBB        
Disclosure of fair value of plan assets [line items]        
Bonds 17     16
Below BBB        
Disclosure of fair value of plan assets [line items]        
Bonds 5     4
A        
Disclosure of fair value of plan assets [line items]        
Loans 1     1
Level I        
Disclosure of fair value of plan assets [line items]        
Loans 0     0
Alternative funds 0     0
Money market and cash and cash equivalents 2     2
Total 2     3
Level I | Canadian        
Disclosure of fair value of plan assets [line items]        
Equity securities 0     0
Level I | US        
Disclosure of fair value of plan assets [line items]        
Equity securities       0
Level I | International        
Disclosure of fair value of plan assets [line items]        
Equity securities 0     0
Level I | Private        
Disclosure of fair value of plan assets [line items]        
Equity securities 0     0
Level I | A - AAA        
Disclosure of fair value of plan assets [line items]        
Bonds 0     0
Level I | BBB        
Disclosure of fair value of plan assets [line items]        
Bonds 0     1
Level I | Below BBB        
Disclosure of fair value of plan assets [line items]        
Bonds 0     0
Level II        
Disclosure of fair value of plan assets [line items]        
Loans 1     2
Alternative funds 0     0
Money market and cash and cash equivalents 19     19
Total 104     160
Level II | Canadian        
Disclosure of fair value of plan assets [line items]        
Equity securities 12     12
Level II | US        
Disclosure of fair value of plan assets [line items]        
Equity securities       6
Level II | International        
Disclosure of fair value of plan assets [line items]        
Equity securities 53     86
Level II | Private        
Disclosure of fair value of plan assets [line items]        
Equity securities 0     0
Level II | A - AAA        
Disclosure of fair value of plan assets [line items]        
Bonds 18     30
Level II | BBB        
Disclosure of fair value of plan assets [line items]        
Bonds 1     5
Level II | Below BBB        
Disclosure of fair value of plan assets [line items]        
Bonds 0     0
Level III        
Disclosure of fair value of plan assets [line items]        
Loans 0     0
Alternative funds 46     44
Money market and cash and cash equivalents 2     0
Total 151     121
Level III | Canadian        
Disclosure of fair value of plan assets [line items]        
Equity securities 0     0
Level III | US        
Disclosure of fair value of plan assets [line items]        
Equity securities       0
Level III | International        
Disclosure of fair value of plan assets [line items]        
Equity securities 0     0
Level III | Private        
Disclosure of fair value of plan assets [line items]        
Equity securities 1     1
Level III | A - AAA        
Disclosure of fair value of plan assets [line items]        
Bonds 81     62
Level III | BBB        
Disclosure of fair value of plan assets [line items]        
Bonds 16     10
Level III | Below BBB        
Disclosure of fair value of plan assets [line items]        
Bonds $ 5     $ 4