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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) $ in Millions	9 Months Ended
	Jun. 30, 2019 USD ($)		Jun. 30, 2018 USD ($)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 323
Financing costs, net	0		$ 3
Cash flows from operating activities
Net income (loss)	829		1,220
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)	1,402		1,285
Amortization of nuclear fuel cost	277		282
Non-cash retirement benefit expense	235		243
Prepayment credits applied to revenue	(10)		(75)
Amortization of Regulatory Asset	240		15
Changes in current assets and liabilities
Accounts receivable, net	149		(11)
Inventories and other current assets, net	(145)		5
Accounts payable and accrued liabilities	(217)		(68)
Accrued interest	(21)		(52)
Pension contributions	(232)		(229)
Other, net	(28)		(78)
Net cash provided by operating activities	2,479		2,537
Cash flows from investing activities
Construction expenditures	(1,292)		(1,354)
Nuclear fuel expenditures	(223)		(181)
Loans and other receivables
Advances	(8)		(12)
Repayments	6		3
Other, net	(16)		(2)
Net cash used in investing activities	(1,533)		(1,546)
Long-term debt
Redemptions and repurchases of power bonds	(1,034)	[1]	(1,731)
Repayments of Other Long-term Debt	46		52
Redemptions of debt of variable interest entities	(19)		(18)
Short-term debt issues (redemptions), net	196		(133)
Payments on leases and leasebacks	(41)		(40)
Other, net	(1)		0
Net cash provided by (used in) financing activities	(945)		(979)
Net change in cash and cash equivalents	1		12
Cash and cash equivalents at end of period	300
Significant non-cash transactions
Accrued capital and nuclear fuel expenditures	266		315
Proceeds from Issuance of Unsecured Debt	0		998
Lease Obligation Incurred	$ 6		$ 0
[1] (1) All redemptions were at 100 percent of par.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
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- Definition

The cash inflow associated with the collection, including prepayments, of loans receivable issued for financing of goods and services.

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-Publisher FASB
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-SubTopic 10
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- Definition

The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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- Definition

Amount of cash inflow (outflow) from financing activities classified as other.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
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-Topic 230
-SubTopic 10
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- References

No definition available.

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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.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
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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.

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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).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
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- Definition

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

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-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
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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.

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-SubTopic 10
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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.

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-SubTopic 10
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