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CAPITAL RISK MANAGEMENT - Free Cash Flow (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Share Capital, Reserves And Other Equity Interest [Abstract]    
Adjusted EBITDA $ 6,393 $ 5,887
Deduct (add):    
Capital expenditures 3,075 2,788
Interest on borrowings, net and capitalized interest 1,090 728
Cash income taxes 455 700
Free cash flow $ 1,773 $ 1,671