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Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2020

Sep. 30, 2019

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 equity and trading debt securities held during each period as follows:

			Unrealized Investment Gains (Losses) At or for the years ended September 30
Fund			Financial Statement Presentation						2020						2019
NDT			Regulatory asset						$	37					$	(112)
ART			Regulatory asset						32						(70)
SERP			Other income (expense)						3						—
DCP			Other income (expense)						2						(2)

Fair Value Measurements

Fair Value Measurements At September 30, 2020
			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			$	500					$	—					$	—					$	500
Government debt securities(1)			485						40						—						525
Corporate debt securities(2)			—						356						—						356
Mortgage and asset-backed securities			—						27						—						27
Institutional mutual funds			188						—						—						188
Forward debt securities contracts			—						13						—						13
Private equity funds measured at net asset value(3)			—						—						—						194
Private real asset funds measured at net asset value(3)			—						—						—						168
Private credit measured at net asset value(3)			—						—						—						53
Commingled funds measured at net asset value(3)			—						—						—						1,174
Total investments			1,173						436						—						3,198
Commodity contract derivatives			—						49						—						49
Total			$	1,173					$	485					$	—					$	3,247
			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(4)			$	—					$	209					$	—					$	209
Interest rate swaps			—						2,041						—						2,041
Commodity contract derivatives			—						3						—						3
Total			$	—					$	2,253					$	—					$	2,253

Notes

(1) Includes government-sponsored entities.

(2) Includes both U.S. and foreign debt.

(3) 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 on the Consolidated Balance Sheets.

(4) 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 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.

Fair Value Measurements At September 30, 2019
			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			$	464					$	—					$	—					$	464
Government debt securities			279						65						—						344
Corporate debt securities			—						417						—						417
Mortgage and asset-backed securities			—						32						—						32
Institutional mutual funds			250						—						—						250
Forward debt securities contracts			—						22						—						22
Private equity funds measured at net asset value(1)			—						—						—						140
Private real asset funds measured at net asset value(1)			—						—						—						135
Private credit measured at net asset value(1)			—						—						—						33
Commingled funds measured at net asset value(1)			—						—						—						1,131
Total investments			993						536						—						2,968
Commodity contract derivatives			—						7						5						12
Total			$	993					$	543					$	5					$	2,980
			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)			$	—					$	208					$	—					$	208
Interest rate swaps			—						1,764						—						1,764
Commodity contract derivatives			—						44						9						53
Total			$	—					$	2,016					$	9					$	2,025

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 on 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 — Risk Management Activities and Derivative Transactions — 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, 2018			$	58
Change in net unrealized gains (losses) deferred as regulatory assets and liabilities			(62)
Balance at September 30, 2019			(4)
Settlements			(1)
Change in net unrealized gains (losses) deferred as regulatory assets and liabilities			5
Balance at September 30, 2020			$	—

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, 2019

Valuation Technique(s)

Unobservable Inputs

Range

Assets

Commodity contract derivatives

$

5

Pricing model

Coal supply and demand

0.4 - 0.8 billion tons/year

Long-term market prices

$12.10 - $94.51/ton

Liabilities

Commodity contract derivatives

$

9

Pricing model

Coal supply and demand

0.4 - 0.8 billion tons/year

Long-term market prices

$12.10 - $94.51/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, 2020 and 2019, were as follows:

Estimated Values of Financial Instruments Not Recorded at Fair Value
									At September 30, 2020												At September 30, 2019
			Valuation Classification						Carrying Amount						Fair Value						Carrying Amount						Fair Value
EnergyRight® receivables (including current portion)			Level 2						$	87					$	86					$	101					$	100
Loans and other long-term receivables, net (including current portion)			Level 2						$	105					$	93					$	131					$	120
EnergyRight® financing obligations (including current portion)			Level 2						$	97					$	108					$	113					$	126
Unfunded loan commitments			Level 2						$	—					$	2					$	—					$	10
Membership interests of VIEs subject to mandatory redemption (including current portion)			Level 2						$	26					$	35					$	28					$	37
Long-term outstanding power bonds (including current maturities), net			Level 2						$	19,743					$	26,630					$	20,124					$	26,059
Long-term debt of VIEs (including current maturities), net			Level 2						$	1,089					$	1,419					$	1,128					$	1,371
Long-term notes payable (including current maturities)			Level 2						$	—					$	—					$	23					$	23

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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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