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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash flows from operating activities |  |  |
Net income (loss) | $ 750 |  | $ 313
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) | 875 |  | 898
Amortization of nuclear fuel cost | 189 |  | 172
Non-cash retirement benefit expense | 162 |  | 168
Prepayment credits applied to revenue | (50) |  | (50)
Fuel cost adjustment deferral | (39) |  | 106
Fuel cost tax equivalents | (6) |  | 2
Changes in current assets and liabilities |  |  |
Accounts receivable, net | 230 |  | 440
Inventories and other current assets, net | 19 |  | (83)
Accounts payable and accrued liabilities | (123) |  | (216)
Accrued interest | 4 |  | 11
Regulatory assets costs | (5) |  | (14)
Pension contributions | (154) |  | (155)
Other, net | (10) |  | (76)
Net cash provided by operating activities | 1,842 |  | 1,516
Cash flows from investing activities |  |  |
Construction expenditures | (958) |  | (1,119)
Nuclear fuel expenditures | (177) |  | (195)
Loans and other receivables |  |  |
Advances | (10) |  | (5)
Repayments | 2 |  | 2
Other, net | 2 |  | 15
Net cash used in investing activities | (1,141) |  | (1,302)
Long-term debt |  |  |
Issues of power bonds | 998 |  | 999
Redemptions and repurchases of power bonds | (700) | [1] | (528)
Repayments of debt of variable interest entities | (18) |  | (17)
Redemptions of notes payable | (29) |  | (26)
Short-term debt issues (redemptions), net | (13) |  | (595)
Payments on leases and leasebacks | (39) |  | (38)
Financing costs, net | 3 |  | 4
Payments to U.S. Treasury | (3) |  | (3)
Other, net | (1) |  | (2)
Net cash provided by (used in) financing activities | 192 |  | (214)
Net change in cash and cash equivalents | 893 |  | 0
Cash and cash equivalents at beginning of period | 300 |  | 300
Cash and cash equivalents at end of period | 1,193 |  | 300
Significant non-cash transactions |  |  |
Accrued capital and nuclear fuel expenditures | 294 |  | 395
Capital Lease Obligations Incurred | $ 0 |  | $ 3
[1] | All redemptions were at 100 percent of par.

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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3095-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 + Details
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- References No definition available. + Details
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- Definition The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 + Details
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- Definition The amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. For cash flows, this element primarily pertains to amortization of deferred credits on long-term arrangements. As a noncash item, it is deducted from net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.4) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow for a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow for the payment of debt classified as other, maturing after one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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