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Supplementary Cash Flow Information (Tables)
12 Months Ended
Dec. 31, 2023
Supplemental Cash Flow Elements [Abstract]  
Supplementary Information to Consolidated Statements of Cash Flows
($ millions)2023 2022 
Cash paid for
Interest1,255 1,057 
Income taxes129 79 
Change in working capital
Accounts receivable and other current assets142 (479)
Prepaid expenses(7)(22)
Inventories(1)(153)
Regulatory assets - current portion104 (307)
Accounts payable and other current liabilities(390)449 
Regulatory liabilities - current portion71 33 
(81)(479)
Non-cash investing and financing activities
Accrued capital expenditures516 411 
Common share dividends reinvested408 364 
Contributions in aid of construction 15 13