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EMPLOYEE POST-RETIREMENT BENEFITS - Measured at Fair Value (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Employee post-retirement benefits      
Fair value of plan assets $ 3,835 $ 4,576  
Percentage of Total Portfolio 100.00% 100.00%  
Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 1,998 $ 1,946  
Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 1,205 2,065  
Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 632 565 $ 417
Cash and Cash Equivalents      
Employee post-retirement benefits      
Fair value of plan assets $ 56 $ 70  
Percentage of Total Portfolio 1.00% 2.00%  
Cash and Cash Equivalents | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 55 $ 68  
Cash and Cash Equivalents | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 1 2  
Cash and Cash Equivalents | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Equity Securities, Canadian      
Employee post-retirement benefits      
Fair value of plan assets $ 117 $ 417  
Percentage of Total Portfolio 3.00% 9.00%  
Equity Securities, Canadian | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 117 $ 269  
Equity Securities, Canadian | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 0 148  
Equity Securities, Canadian | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Equity Securities, U.S.      
Employee post-retirement benefits      
Fair value of plan assets $ 897 $ 813  
Percentage of Total Portfolio 24.00% 18.00%  
Equity Securities, U.S. | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 897 $ 649  
Equity Securities, U.S. | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 0 164  
Equity Securities, U.S. | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Equity Securities, International      
Employee post-retirement benefits      
Fair value of plan assets $ 344 $ 480  
Percentage of Total Portfolio 9.00% 10.00%  
Equity Securities, International | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 172 $ 126  
Equity Securities, International | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 172 354  
Equity Securities, International | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Equity Securities, Global      
Employee post-retirement benefits      
Fair value of plan assets $ 75 $ 424  
Percentage of Total Portfolio 2.00% 9.00%  
Equity Securities, Global | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 0 $ 111  
Equity Securities, Global | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 75 313  
Equity Securities, Global | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Equity Securities, Emerging      
Employee post-retirement benefits      
Fair value of plan assets $ 177 $ 145  
Percentage of Total Portfolio 5.00% 3.00%  
Equity Securities, Emerging | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 50 $ 25  
Equity Securities, Emerging | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 127 120  
Equity Securities, Emerging | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Fixed Income Securities, Canadian Bonds, Federal      
Employee post-retirement benefits      
Fair value of plan assets $ 221 $ 226  
Percentage of Total Portfolio 6.00% 5.00%  
Fixed Income Securities, Canadian Bonds, Federal | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 0 $ 0  
Fixed Income Securities, Canadian Bonds, Federal | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 221 226  
Fixed Income Securities, Canadian Bonds, Federal | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Fixed Income Securities, Canadian Bonds, Provincial      
Employee post-retirement benefits      
Fair value of plan assets $ 249 $ 331  
Percentage of Total Portfolio 6.00% 7.00%  
Fixed Income Securities, Canadian Bonds, Provincial | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 0 $ 0  
Fixed Income Securities, Canadian Bonds, Provincial | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 249 331  
Fixed Income Securities, Canadian Bonds, Provincial | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Fixed Income Securities, Canadian Bonds, Municipal      
Employee post-retirement benefits      
Fair value of plan assets $ 12 $ 16  
Percentage of Total Portfolio 0.00% 0.00%  
Fixed Income Securities, Canadian Bonds, Municipal | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 0 $ 0  
Fixed Income Securities, Canadian Bonds, Municipal | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 12 16  
Fixed Income Securities, Canadian Bonds, Municipal | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Fixed Income Securities, Canadian Bonds, Corporate      
Employee post-retirement benefits      
Fair value of plan assets $ 108 $ 147  
Percentage of Total Portfolio 3.00% 4.00%  
Fixed Income Securities, Canadian Bonds, Corporate | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 0 $ 0  
Fixed Income Securities, Canadian Bonds, Corporate | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 108 147  
Fixed Income Securities, Canadian Bonds, Corporate | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Fixed Income Securities, U.S. Bonds, Federal      
Employee post-retirement benefits      
Fair value of plan assets $ 335 $ 448  
Percentage of Total Portfolio 9.00% 10.00%  
Fixed Income Securities, U.S. Bonds, Federal | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 177 $ 433  
Fixed Income Securities, U.S. Bonds, Federal | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 158 15  
Fixed Income Securities, U.S. Bonds, Federal | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Fixed Income Securities, U.S. Bonds, Municipal      
Employee post-retirement benefits      
Fair value of plan assets $ 1 $ 1  
Percentage of Total Portfolio 0.00% 0.00%  
Fixed Income Securities, U.S. Bonds, Municipal | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 0 $ 0  
Fixed Income Securities, U.S. Bonds, Municipal | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 1 1  
Fixed Income Securities, U.S. Bonds, Municipal | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Fixed Income Securities, U.S. Bonds, Corporate      
Employee post-retirement benefits      
Fair value of plan assets $ 439 $ 210  
Percentage of Total Portfolio 11.00% 5.00%  
Fixed Income Securities, U.S. Bonds, Corporate | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 345 $ 67  
Fixed Income Securities, U.S. Bonds, Corporate | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 94 143  
Fixed Income Securities, U.S. Bonds, Corporate | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Fixed Income Securities, International, Government      
Employee post-retirement benefits      
Fair value of plan assets $ 11 $ 13  
Percentage of Total Portfolio 0.00% 0.00%  
Fixed Income Securities, International, Government | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 5 $ 6  
Fixed Income Securities, International, Government | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 6 7  
Fixed Income Securities, International, Government | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Fixed Income Securities, International, Corporate      
Employee post-retirement benefits      
Fair value of plan assets $ 58 $ 73  
Percentage of Total Portfolio 1.00% 2.00%  
Fixed Income Securities, International, Corporate | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 0 $ 0  
Fixed Income Securities, International, Corporate | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 58 73  
Fixed Income Securities, International, Corporate | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Fixed Income Securities, International, Mortgage-backed      
Employee post-retirement benefits      
Fair value of plan assets $ 37 $ 47  
Percentage of Total Portfolio 1.00% 1.00%  
Fixed Income Securities, International, Mortgage-backed | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 36 $ 42  
Fixed Income Securities, International, Mortgage-backed | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 1 5  
Fixed Income Securities, International, Mortgage-backed | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Net Forward Contract, International      
Employee post-retirement benefits      
Fair value of plan assets $ (78) $ 0  
Percentage of Total Portfolio (2.00%) 0.00%  
Net Forward Contract, International | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 0 $ 0  
Net Forward Contract, International | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets (78) 0  
Net Forward Contract, International | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Real estate      
Employee post-retirement benefits      
Fair value of plan assets $ 336 $ 283  
Percentage of Total Portfolio 9.00% 6.00%  
Real estate | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 0 $ 0  
Real estate | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Real estate | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 336 283  
Infrastructure      
Employee post-retirement benefits      
Fair value of plan assets $ 296 $ 281  
Percentage of Total Portfolio 8.00% 6.00%  
Infrastructure | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 0 $ 0  
Infrastructure | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Infrastructure | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 296 281  
Private equity funds      
Employee post-retirement benefits      
Fair value of plan assets $ 0 $ 1  
Percentage of Total Portfolio 0.00% 0.00%  
Private equity funds | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 0 $ 0  
Private equity funds | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Private equity funds | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets 0 1  
Funds held on deposit      
Employee post-retirement benefits      
Fair value of plan assets $ 144 $ 150  
Percentage of Total Portfolio 4.00% 3.00%  
Funds held on deposit | Quoted Prices in Active Markets (Level I)      
Employee post-retirement benefits      
Fair value of plan assets $ 144 $ 150  
Funds held on deposit | Significant Other Observable Inputs (Level II)      
Employee post-retirement benefits      
Fair value of plan assets 0 0  
Funds held on deposit | Significant Unobservable Inputs (Level III)      
Employee post-retirement benefits      
Fair value of plan assets $ 0 $ 0