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Employee Future Benefits - Fair Value of Plan Assets by Major Category (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value of plan assets [line items]    
Loans(1) $ 2 $ 2
Alternative funds 44 39
Money market and cash and cash equivalents 21 20
Total 284 289
Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 12 18
US    
Disclosure of fair value of plan assets [line items]    
Equity securities 6 17
International    
Disclosure of fair value of plan assets [line items]    
Equity securities 86 79
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 92 88
BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 16 19
Loans(1)   1
Below BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 4 6
A    
Disclosure of fair value of plan assets [line items]    
Loans(1) 1 1
Level I    
Disclosure of fair value of plan assets [line items]    
Loans(1) 0 0
Alternative funds 0 0
Money market and cash and cash equivalents 2 0
Total 3 1
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 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 1 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 2
Alternative funds 0 0
Money market and cash and cash equivalents 19 20
Total 160 169
Level II | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 12 18
Level II | US    
Disclosure of fair value of plan assets [line items]    
Equity securities 6 17
Level II | International    
Disclosure of fair value of plan assets [line items]    
Equity securities 86 79
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 30 27
Level II | BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 5 6
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(1) 0 0
Alternative funds 44 39
Money market and cash and cash equivalents 0 0
Total 121 119
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 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 62 61
Level III | BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 10 12
Level III | Below BBB    
Disclosure of fair value of plan assets [line items]    
Bonds $ 4 $ 6