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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2019		Mar. 31, 2018
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 323		$ 1,220
Financing costs, net	0		3
Cash flows from operating activities
Net income (loss)	664		750
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)	821		875
Amortization of nuclear fuel cost	179		189
Non-cash retirement benefit expense	157		162
Prepayment credits applied to revenue	(10)		(50)
Amortization of Regulatory Asset	(184)		(26)
Changes in current assets and liabilities
Accounts receivable, net	269		230
Inventories and other current assets, net	(83)		19
Accounts payable and accrued liabilities	(274)		(111)
Accrued interest	6		4
Pension contributions	(155)		(154)
Other, net	(11)		(30)
Net cash provided by operating activities	1,747		1,858
Cash flows from investing activities
Construction expenditures	(862)		(958)
Nuclear fuel expenditures	(172)		(177)
Loans and other receivables
Advances	(4)		(10)
Repayments	4		2
Other, net	(6)		2
Net cash used in investing activities	(1,040)		(1,141)
Long-term debt
Redemptions and repurchases of power bonds	(1,003)	[1]	(700)
Repayments of Other Long-term Debt	21		18
Redemptions of debt of variable interest entities	(19)		(29)
Short-term debt issues (redemptions), net	378		(13)
Payments on leases and leasebacks	(40)		(39)
Other, net	(1)		(4)
Net cash provided by (used in) financing activities	(706)		192
Net change in cash and cash equivalents	1		909
Cash and cash equivalents at end of period	300
Significant non-cash transactions
Accrued capital and nuclear fuel expenditures	281		294
Proceeds from Issuance of Unsecured Debt	$ 0		$ 998
[1] (1) All redemptions were at 100 percent of par.

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
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-Paragraph 14
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Amount of cash inflow (outflow) from financing activities classified as other.

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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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- References

No definition available.

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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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-Name Accounting Standards Codification
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-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
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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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Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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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
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-Paragraph 15
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The cash outflow for a borrowing supported by a written promise to pay an obligation.

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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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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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