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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities    
Net income (loss) $ 572 $ 609
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) 1,411 1,475
Amortization of nuclear fuel cost 205 206
Non-cash retirement benefit expense 245 249
Prepayment credits applied to revenue (75) (75)
Fuel cost adjustment deferral (105) (6)
Fuel cost tax equivalents (24) (17)
Changes in current assets and liabilities    
Accounts receivable, net 122 118
Inventories and other, net (11) (117)
Accounts payable and accrued liabilities (133) (208)
Accrued interest (43) (65)
Regulatory assets costs (24) (18)
Pension contributions (143) (144)
Insurance recoveries 7 50
Other, net (126) (41)
Net cash provided by operating activities 1,878 2,016
Cash flows from investing activities    
Construction expenditures (2,072) (2,064)
Combustion turbine asset acquisition 0 (342)
Nuclear fuel expenditures (161) (252)
Purchases of investments 0 (1)
Loans and other receivables    
Advances (5) (11)
Repayments 5 7
Other, net (20) (27)
Net cash used in investing activities (2,253) (2,690)
Long-term debt    
Redemptions and repurchases of power bonds (35) (1,180)
Redemptions of variable interest entities (16) (15)
Short-term debt issues (redemptions), net 506 1,986
Payments on leases and leasebacks (81) (77)
Payments to U.S. Treasury (4) (5)
Other, net 6 (35)
Net cash provided by (used in) financing activities 376 674
Net change in cash and cash equivalents 1 0
Cash and cash equivalents at beginning of period 300 500
Cash and cash equivalents at end of period 301 500
Significant non-cash transactions    
Accrued capital and nuclear fuel expenditures 438 414
Capital Lease Obligations Incurred $ 85 $ 0