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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2019	Sep. 30, 2018
Carrying Value
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight® receivables (including current portion)	$ 107	$ 112
Loans and other long-term receivables, net (including current portion)	151	138
EnergyRight® financing obligation (including current portion)	120	127
Unfunded loan commitments	0	0
Membership interest of variable interest entities subject to mandatory redemption (including current portion)	29	30
Long-term outstanding power bonds (including current maturities), net	20,193	21,189
Long-term debt of variable interest entities (including current maturities), net	1,146	1,165
Long-term notes payable (including current maturities)	48	69
EnergyRight® receivables (including current portion)	106	112
Loans and other long-term receivables, net (including current portion)	136	123
EnergyRight® financing obligation (including current portion)	135	143
Unfunded loan commitments	5	3
Membership interest of variable interest entities subject to mandatory redemption (including current portion)	36	37
Long-term outstanding power bonds (including current maturities), net	24,180	23,896
Long-term debt of variable interest entities (including current maturities), net	1,299	1,256
Long-term notes payable (including current maturities)	$ 47	$ 68

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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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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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