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Statement of Cash Flows, Supplemental Disclosures
9 Months Ended
Jun. 30, 2020
Supplemental Cash Flow Elements [Abstract]  
Cash Flow, Supplemental Disclosures Supplemental Cash Flow Information         Construction in progress and Nuclear fuel expenditures included in Accounts payable and accrued liabilities at June 30, 2020 and 2019, were $339 million and $266 million, respectively, and are excluded from the Statements of Consolidated Cash Flows for the nine months ended June 30, 2020 and 2019, as non-cash investing activities.Excluded from the Statements of Consolidated Cash Flows at June 30, 2020 and 2019, as non-cash financing activities were lease obligations incurred related to lease equipment of $3 million and $6 million, respectively.