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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 858 $ 323
Cash flows from operating activities    
Net income (loss) 447 664
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) 1,052 821
Amortization of nuclear fuel cost 194 179
Non-cash retirement benefit expense 162 157
Amortization of Regulatory Asset 81 184
Changes in current assets and liabilities    
Accounts receivable, net 475 269
Inventories and other current assets, net (101) (83)
Accounts payable and accrued liabilities (218) (274)
Accrued interest 13 6
Pension contributions (155) (155)
Other, net (80) (21)
Net cash provided by operating activities 1,870 1,747
Cash flows from investing activities    
Construction expenditures (840) (862)
Nuclear fuel expenditures (184) (172)
Loans and other receivables    
Advances (3) (4)
Repayments 4 4
Other, net 13 (6)
Net cash used in investing activities (1,010) (1,040)
Long-term debt    
Redemptions and repurchases of power bonds (1,218) [1] (1,003)
Repayments of Other Long-term Debt 20 19
Redemptions of debt of variable interest entities 0 (21)
Short-term debt issues (redemptions), net 953 378
Payments on leases and leasebacks (43) (40)
Other, net 4 (1)
Net cash provided by (used in) financing activities (324) (706)
Net change in cash and cash equivalents 536 $ 1
Cash and cash equivalents at end of period $ 835  
[1] (1) Amounts for notes payable were less than $1 million at March 31, 2020, and are therefore not represented in the table above.(2) All redemptions were at 100 percent of par.