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Supplementary Cash Flow Information (Tables)
12 Months Ended
Dec. 31, 2024
Supplemental Cash Flow Elements [Abstract]  
Supplementary Information to Consolidated Statements of Cash Flows
($ millions)2024 2023 
Years ended December 31
Cash paid (received) for
Interest1,361 1,255 
Income taxes(17)129 
Change in working capital
Accounts receivable and other current assets(2)142 
Prepaid expenses(21)(7)
Inventories(73)(1)
Regulatory assets - current portion93 104 
Accounts payable and other current liabilities115 (390)
Regulatory liabilities - current portion56 71 
168 (81)
Non-cash financing activity
Common share dividends reinvested434 408 
As at December 31
Non-cash investing and financing activities
Accrued capital expenditures722 516 
Contributions in aid of construction 14 15