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Finance Lease Receivables (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of recognised finance lease as assets by lessee [line items]    
Undiscounted finance lease payments to be received $ 265 $ 332
Undiscounted finance lease payments to be received, at present value 225 264
Less: unearned finance lease income 40 68
Less: unearned finance lease income, present value 0 0
Total finance lease receivables 225 264
Current finance lease receivables 40 36
Long-term portion of finance lease receivable 185 228
BHP Billiton Nickel West Pty Ltd. | Southern Cross Energy    
Disclosure of recognised finance lease as assets by lessee [line items]    
Total finance lease receivables   89
2022    
Disclosure of recognised finance lease as assets by lessee [line items]    
Undiscounted finance lease payments to be received 58 63
Undiscounted finance lease payments to be received, at present value 54 56
Second to fifth years inclusive    
Disclosure of recognised finance lease as assets by lessee [line items]    
Undiscounted finance lease payments to be received 127 169
Undiscounted finance lease payments to be received, at present value 105 126
More than five years    
Disclosure of recognised finance lease as assets by lessee [line items]    
Undiscounted finance lease payments to be received 80 100
Undiscounted finance lease payments to be received, at present value $ 66 $ 82