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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2017	Sep. 30, 2017
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight® receivables (including current portion)	$ 123	$ 127
Loans and other long-term receivables, net (including current portion)	113	107
EnergyRight® financing obligation (including current portion)	156	161
Unfunded loan commitments	18	18
Membership interest of variable interest entity subject to mandatory redemption (including current portion)	41	41
Long-term outstanding power bonds (including current maturities), net	26,134	26,857
Long-term debt of variable interest entities (including current maturities), net	1,366	1,356
Long-term notes payable (including current maturities)	119	121
Carrying Value
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight® receivables (including current portion)	122	125
Loans and other long-term receivables, net (including current portion)	127	118
EnergyRight® financing obligation (including current portion)	140	144
Unfunded loan commitments	0	0
Membership interest of variable interest entity subject to mandatory redemption (including current portion)	32	32
Long-term outstanding power bonds (including current maturities), net	21,245	21,933
Long-term debt of variable interest entities (including current maturities), net	1,200	1,200
Long-term notes payable (including current maturities)	$ 120	$ 122

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- Definition

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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