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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2021		Mar. 31, 2020
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 519		$ 858
Cash flows from operating activities
Net income (loss)	640		447
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)	770		1,052
Amortization of nuclear fuel cost	193		194
Non-cash retirement benefit expense	166		162
Amortization of Regulatory Asset	(39)		(83)
Changes in current assets and liabilities
Accounts receivable, net	(246)		(475)
Inventories and other current assets, net	43		101
Increase (Decrease) in Accounts Payable	(70)		(218)
Accrued interest	6		13
Pension contributions	(155)		(155)
Other, net	144		82
Net cash provided by operating activities	1,570		1,870
Cash flows from investing activities
Construction expenditures	(975)		(840)
Nuclear fuel expenditures	129		184
Loans and other receivables
Advances	(7)		(3)
Repayments	2		4
Other, net	(17)		(13)
Net cash used in investing activities	(1,092)		(1,010)
Long-term debt
Redemptions and repurchases of power bonds	(1,501)	[1]	(1,218)
Repayments of Other Long-term Debt	20		20
Short-term debt issues (redemptions), net	1,184		953
Payments on leases and leasebacks	(154)		(43)
Other, net	11		4
Net cash provided by (used in) financing activities	(480)		(324)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(2)
Net change in cash and cash equivalents			$ 536
Cash and cash equivalents at end of period	$ 500
[1] (1) All redemptions were at 100 percent of par.

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- Definition

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

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The cash outflow for the purchase of loan receivable arising from the financing of goods and services.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Amount of cost (reversal of cost) for pension and other postretirement benefits.

+ References

No definition available.

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Amount of cash outflow for pension benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes other postretirement benefit.

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

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-SubTopic 10
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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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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
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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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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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- 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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