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Fair Value Measurements Fair Value Measurements - (Tables)

12 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Valuation Techniques

The measurement of fair value results in classification into a hierarchy by the inputs used to determine the fair value as follows:

Level 1	—		Unadjusted quoted prices in active markets accessible by the reporting entity for identical assets or liabilities.  Active markets are those in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing.
Level 2	—		Pricing inputs other than quoted market prices included in Level 1 that are based on observable market data and that are directly or indirectly observable for substantially the full term of the asset or liability.  These include quoted market prices for similar assets or liabilities, quoted market prices for identical or similar assets in markets that are not active, adjusted quoted market prices, inputs from observable data such as interest rate and yield curves, volatilities and default rates observable at commonly quoted intervals, and inputs derived from observable market data by correlation or other means.
Level 3	—		Pricing inputs that are unobservable, or less observable, from objective sources.  Unobservable inputs are only to be used to the extent observable inputs are not available.  These inputs maintain the concept of an exit price from the perspective of a market participant and should reflect assumptions of other market participants.  An entity should consider all market participant assumptions that are available without unreasonable cost and effort.  These are given the lowest priority and are generally used in internally developed methodologies to generate management's best estimate of the fair value when no observable market data is available.

Unrealized Investment Gains (Losses)

TVA recorded unrealized gains and losses related to its trading securities held during each period as follows:

	Unrealized Investment Gains (Losses) At September 30
Fund	Financial Statement Presentation		2018				2017
SERP	Other income (expense)		$	1			$	4
DCP	Other income (expense)		1				2
NDT	Regulatory asset		18				92
ART	Regulatory asset		15				43

Fair Value Measurements

Fair Value Measurements At September 30, 2018
	Quoted Prices in Active  Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)				Total
Assets
Investments
Equity securities	$	220			$	—			$	—			$	220
Government debt securities	199				37				—				236
Corporate debt securities	—				499				—				499
Mortgage and asset-backed securities	—				50				—				50
Institutional mutual funds	126				—				—				126
Forward debt securities contracts	—				45				—				45
Private equity funds measured at net asset value(1)	—				—				—				132
Private real estate funds measured at net asset value(1)	—				—				—				124
Commingled funds measured at net asset value(1)	—				—				—				1,430
Total investments	545				631				—				2,862
Commodity contract derivatives	—				13				59				72
Total	$	545			$	644			$	59			$	2,934
	Quoted Prices in Active Markets for Identical Liabilities (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)				Total
Liabilities
Currency swaps(2)	$	—			$	94			$	—			$	94
Interest rate swaps	—				1,199				—				1,199
Commodity contract derivatives	—				11				1				12
Total	$	—			$	1,304			$	1			$	1,305

Notes

(1) Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.

(2) TVA records currency swaps net of cash collateral received from or paid to the counterparty, to the extent such amount is not recorded in Accounts payable and accrued liabilities. See Note 15 — Offsetting of Derivative Assets and Liabilities.

Fair Value Measurements At September 30, 2017
	Quoted Prices in Active  Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)				Total
Assets
Investments
Equity securities	$	226			$	—			$	—			$	226
Government debt securities	100				42				—				142
Corporate debt securities	—				373				—				373
Mortgage and asset-backed securities	—				49				—				49
Institutional mutual funds	94				—				—				94
Forward debt securities contracts	—				19				—				19
Private equity funds measured at net asset value(1)	—				—				—				136
Private real estate funds measured at net asset value(1)	—				—				—				113
Commingled funds measured at net asset value(1)	—				—				—				1,451
Total investments	420				483				—				2,603
Commodity contract derivatives	—				8				2				10
Total	$	420			$	491			$	2			$	2,613
	Quoted Prices in Active Markets for Identical Liabilities (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)				Total
Liabilities
Currency swaps(2)	$	—			$	103			$	—			$	103
Interest rate swaps	—				1,511				—				1,511
Commodity contract derivatives	—				1				69				70
Commodity derivatives under FTP(2)
Swap contracts	—				1				—				1
Total	$	—			$	1,616			$	69			$	1,685

Notes

(1) Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.

(2) Due to the right of setoff and method of settlement, TVA elects to record commodity derivatives under the FTP based on its net commodity position with the counterparty or FCM. Deposits are made to TVA's margin cash accounts held with each FCM to offset any net liability positions in full for derivatives that are transacted with FCMs. TVA records currency swaps net of any cash collateral received from or paid to the counterparty, to the extent such amount is not recorded in Accounts payable and accrued liabilities. See Note 15 — Offsetting of Derivative Assets and Liabilities.

Fair Value Measurements Using Significant Unobservable Inputs

The following table presents a reconciliation of all commodity contract derivatives measured at fair value on a recurring basis using significant unobservable inputs (Level 3):

Fair Value Measurements Using Significant Unobservable Inputs
	Commodity Contract Derivatives
Balance at October 1, 2016	$	(127	)
Purchases	—
Issuances	—
Sales	—
Settlements	—
Change in net unrealized gains (losses) deferred as regulatory assets and liabilities	60
Balance at September 30, 2017	(67		)
Purchases	—
Issuances	—
Sales	—
Settlements	—
Change in net unrealized gains (losses) deferred as regulatory assets and liabilities	125
Balance at September 30, 2018	$	58

Quantitative Information about Level 3 Fair Value Measurements

The following table presents quantitative information related to the significant unobservable inputs used in the measurement of fair value of TVA's assets and liabilities classified as Level 3 in the fair value hierarchy:

Quantitative Information about Level 3 Fair Value Measurements
	Fair Value at September 30, 2018				Valuation Technique(s)		Unobservable Inputs		Range
Assets
Commodity contract derivatives	$	59			Pricing model		Coal supply and demand		0.7 - 0.8 billion tons/year
							Long-term market prices		$12.25 - $112.24/ton
Liabilities
Commodity contract derivatives	$	1			Pricing model		Coal supply and demand		0.7 - 0.8 billion tons/year
							Long-term market prices		$12.25 - $112.24/ton

Quantitative Information about Level 3 Fair Value Measurements
	Fair Value at September 30, 2017				Valuation Technique(s)		Unobservable Inputs		Range
Assets
Commodity contract derivatives	$	2			Pricing model		Coal supply and demand		0.6 - 0.7 billion tons/year
							Long-term market prices		$11.40 - $112.23/ton
Liabilities
Commodity contract derivatives	$	69			Pricing model		Coal supply and demand		0.6 - 0.7 billion tons/year
							Long-term market prices		$11.40 - $112.23/ton

Estimated Values of Financial Instruments Not Recorded at Fair Value

The estimated values of TVA's financial instruments not recorded at fair value at September 30, 2018 and 2017, were as follows:

Estimated Values of Financial Instruments Not Recorded at Fair Value
			At September 30, 2018								At September 30, 2017
	Valuation Classification		Carrying Amount				Fair Value				Carrying Amount				Fair Value
EnergyRight® receivables (including current portion)	Level 2		$	112			$	112			$	125			$	127
Loans and other long-term receivables, net (including current portion)	Level 2		$	138			$	123			$	118			$	107
EnergyRight® financing obligation (including current portion)	Level 2		$	127			$	143			$	144			$	161
Unfunded loan commitments	Level 2		$	—			$	3			$	—			$	18
Membership interests of variable interest entity subject to mandatory redemption (including current portion)	Level 2		$	30			$	37			$	32			$	41
Long-term outstanding power bonds (including current maturities), net	Level 2		$	21,189			$	23,896			$	21,933			$	26,857
Long-term debt of variable interest entities (including current maturities), net	Level 2		$	1,165			$	1,256			$	1,200			$	1,356
Long-term notes payable (including current maturities)	Level 2		$	69			$	68			$	122			$	121

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The tabular disclosure of the estimated values of financial instruments not recorded at fair value. This disclosure includes the class of financial instrument, valuation classification, carrying amount, and fair value.

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Tabular disclosure of the fair value measurement of assets or liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset or liability.

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Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis.

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Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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