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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 521 $ 519
Cash flows from operating activities    
Net income (loss) 220 640
Adjustments to reconcile net income (loss) to net cash provided by operating activities    
Depreciation and amortization (including amortization of debt issuance costs and premiums/discounts) 1,032 770
Amortization of nuclear fuel cost 171 193
Non-cash retirement benefit expense 164 166
Amortization of Regulatory Asset (69) (39)
Changes in current assets and liabilities    
Accounts receivable, net 214 246
Inventories and other current assets, net (79) 43
Accounts payable and accrued liabilities (36) (70)
Accrued interest 17 6
Pension contributions (158) (155)
Other, net (155) 144
Net cash provided by operating activities 1,459 1,570
Cash flows from investing activities    
Construction expenditures (1,140) (975)
Nuclear fuel expenditures (173) 129
Loans and other receivables    
Advances (8) (7)
Repayments 9 2
Other, net 22 17
Net cash used in investing activities (1,290) (1,092)
Long-term debt    
Redemptions and repurchases of power bonds (1) [1] (1,501)
Repayments of Other Long-term Debt 21 20
Short-term debt issues (redemptions), net (96) 1,184
Finance Lease, Principal Payments 52 154
Other, net 4 11
Net cash provided by (used in) financing activities (166) (480)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 3 $ (2)
Cash and cash equivalents at end of period $ 501  
[1] (1) All redemptions were at 100 percent of par.