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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018
Carrying Value
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight® receivables (including current portion)	$ 110	$ 112
Loans and other long-term receivables, net (including current portion)	139	138	$ 139
EnergyRight® financing obligation (including current portion)		127	124
Unfunded loan commitments	0	0
Membership interest of variable interest entities subject to mandatory redemption (including current portion)	30	30
Long-term outstanding power bonds (including current maturities), net	20,175	21,189
Long-term debt of variable interest entities (including current maturities), net	1,165	1,165
Long-term notes payable (including current maturities)	67	69
EnergyRight® receivables (including current portion)		112	109
Loans and other long-term receivables, net (including current portion)	124	123
EnergyRight® financing obligation (including current portion)		143	$ 140
Unfunded loan commitments	7	3
Membership interest of variable interest entities subject to mandatory redemption (including current portion)	37	37
Long-term outstanding power bonds (including current maturities), net	23,484	23,896
Long-term debt of variable interest entities (including current maturities), net	1,267	1,256
Long-term notes payable (including current maturities)	$ 67	$ 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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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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