CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Millions	12 Months Ended
Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Regulatory asset amount expensed	$ 261	$ 2	$ 143
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	322	322
Cash flows from operating activities
Net income (loss)	1,417	1,119	685
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)	1,993	2,554	1,763
Amortization of nuclear fuel cost	379	382	341
Non-cash retirement benefit expense	314	324	837
Prepayment credits applied to revenue	(10)	(100)	(100)
Changes in current assets and liabilities
Accounts receivable, net	(40)	(68)	230
Inventories and other current assets, net	(87)	65	1
Accounts payable and accrued liabilities	(155)	143	(109)
Accrued interest	(8)	(36)	(17)
Pension contributions	(307)	(304)	(805)
Settlements of asset retirement obligations	(89)	(106)	(123)
Other, net	52	(37)	(118)
Net cash provided by operating activities	3,720	3,938	2,728
Cash flows from investing activities
Construction expenditures	(1,700)	(1,759)	(2,153)
Nuclear fuel expenditures	(474)	(457)	(305)
Purchases of investments	(48)	(49)	(49)
Loans and other receivables
Advances	(10)	(12)	(11)
Repayments	11	4	8
Other, net	(22)	4	(26)
Net cash used in investing activities	(2,243)	(2,269)	(2,536)
Long-term debt
Issues of power bonds	0	998	999
Redemptions and repurchases of power bonds	(1,035)	(1,731)	(1,558)
Redemptions of notes payable	(46)	(53)	(27)
Payments on debt of variable interest entities	(38)	(36)	(35)
Short-term debt issues (redemptions), net	(294)	(782)	592
Payments on leases and leasebacks	(43)	(42)	(136)
Financing costs, net	0	(3)	(4)
Other, net	(21)	(9)	(22)
Net cash (used in) provided by financing activities	(1,477)	(1,658)	(191)
Net change in cash and cash equivalents	0	11	1
Cash and cash equivalents at beginning of the year	299	311	310
Cash and cash equivalents at end of the year	$ 299	$ 299	$ 311

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-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

+ Details

Name:	us-gaap_RecognitionOfDeferredRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for a borrowing supported by a written promise to pay an obligation.

+ References

+ Details

Name:	us-gaap_RepaymentsOfNotesPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash outflow for the payment of debt classified as other, maturing after one year or the operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_RepaymentsOfOtherLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

+ References

+ Details

Name:	us-gaap_RepaymentsOfUnsecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration