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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2016	Sep. 30, 2016
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight receivables (including current portion)	$ 142	$ 144
Loans and other long-term receivables, net (including current portion)	142	130
EnergyRight® financing obligation (including current portion)	180	183
Unfunded Loan Commitments	8	17
Membership interest of variable interest entity subject to mandatory redemption (including current portion)	43	46
Long-term outstanding power bonds (including current maturities), net	25,673	28,620
Long-term debt of variable interest entities (including current maturities), net	1,362	1,468
Long-term notes payable (including current maturities)	74	75
Carrying Value
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight receivables (including current portion)	139	141
Loans and other long-term receivables, net (including current portion)	152	141
EnergyRight® financing obligation (including current portion)	161	163
Unfunded Loan Commitments	0	0
Membership interest of variable interest entity subject to mandatory redemption (including current portion)	35	35
Long-term outstanding power bonds (including current maturities), net	21,896	22,456
Long-term debt of variable interest entities (including current maturities), net	1,235	1,234
Long-term notes payable (including current maturities)	$ 75	$ 75

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An unfunded loan commitment is typically a letter from a lending institution to a borrower detailing out the germane terms of a loan that the lender is binding itself to (amount, rate, term, collateral, etc). It is a binding contract on the part of the lender if the borrower accepts the terms of the commitment. They usually are only binding for a short period of time.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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Amount of long-term debt classified as other.

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Amount that would be paid, determined under the conditions specified in the contract, if the holder of the share has the right to redeem the shares.

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Carrying amount of financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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