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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities    
Net income (loss) $ 281 $ 577
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) 949 929
Amortization of nuclear fuel cost 126 140
Non-cash retirement benefit expense 163 166
Prepayment credits applied to revenue (50) (50)
Fuel cost adjustment deferral (16) (61)
Fuel cost tax equivalents (15) (13)
Changes in current assets and liabilities    
Accounts receivable, net 385 243
Inventories and other, net (62) (139)
Accounts payable and accrued liabilities (203) (249)
Accrued interest 14 16
Regulatory assets costs (17) (17)
Pension Contributions (143) (144)
Insurance recoveries 7 50
Other, net (89) (36)
Net cash provided by operating activities 1,330 1,412
Cash flows from investing activities    
Construction expenditures (1,477) (1,407)
Nuclear fuel expenditures (138) (216)
Purchases of investments 0 (1)
Loans and other receivables    
Advances (4) (11)
Repayments 3 5
Other, net 3 (14)
Net cash used in investing activities (1,613) (1,644)
Long-term debt    
Redemptions and repurchases of power bonds (6) (46)
Redemptions of variable interest entities (16) (15)
Short-term debt issues (redemptions), net 372 343
Payments on leases and leasebacks (59) (56)
Payments to U.S. Treasury (3) (4)
Other, net (4) 12
Net cash provided by (used in) financing activities 284 234
Net change in cash and cash equivalents 1 2
Cash and cash equivalents at beginning of period 300 500
Cash and cash equivalents at end of period 301 502
Significant non-cash transactions    
Accrued capital and nuclear fuel expenditures $ 410 $ 251