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Asset Transactions and Impairments - United Kingdom Operations (Details) - U.K. Operations
$ in Millions
3 Months Ended
Jun. 30, 2023
CAD ($)
Asset Transactions and Impairments  
Gross proceeds from sale of discontinued operations, before closing adjustments and other closing costs $ 1,100
Gain on sale, after tax 607
Gain on sale, before tax 607
Foreign exchange gain on sale $ 25