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Benefit Plans Benefit Plans (Tables)

12 Months Ended

Sep. 30, 2020

Retirement Benefits [Abstract]

Obligations and Funded Status

The changes in plan obligations, assets, and funded status for the years ended September 30, 2020 and 2019, were as follows:

Obligations and Funded Status For the years ended September 30
795,900,000			Pension Benefits												Other Post-Retirement Benefits
			2020						2019						2020						2019
Change in benefit obligation
Benefit obligation at beginning of year			$	13,312					$	11,725					$	499					$	428
Service cost			55						44						16						11
Interest cost			415						499						16						18
Plan participants' contributions			6						7						—						—
Collections(1)			—						—						20						22
Actuarial (gain) loss			614						1,756						39						78
Plan change			2						7						—						—
Net transfers (to) from variable fund/401(k) plan			2						1						—						—
Expenses paid			(5)						(6)						—						—
Benefits paid			(726)						(721)						(46)						(58)
Benefit obligation at end of year			13,675						13,312						544						499
Change in plan assets
Fair value of net plan assets at beginning of year			7,980						8,003						—						—
Actual return on plan assets			397						389						—						—
Plan participants' contributions			6						7						—						—
Collections(1)			—						—						20						22
Net transfers (to) from variable fund/401(k) plan			2						1						—						—
Employer contributions			305						307						26						36
Expenses paid			(5)						(6)						—						—
Benefits paid			(726)						(721)						(46)						(58)
Fair value of net plan assets at end of year			7,959						7,980						—						—
Funded status			$	(5,716)					$	(5,332)					$	(544)					$	(499)

Note

(1) Collections include retiree contributions as well as provider discounts and rebates.

Amounts Recognized on TVA's Consolidated Balance Sheets

Amounts related to these benefit plans recognized on TVA's Consolidated Balance Sheets consist of regulatory assets and liabilities that have not been recognized as components of net periodic benefit cost at September 30, 2020 and 2019, and the funded status of TVA's benefit plans, which are included in Accounts payable and accrued liabilities and Post-retirement and post-employment benefit obligations:

Amounts Recognized on TVA's Consolidated Balance Sheets At September 30
			Pension Benefits												Other Post-Retirement Benefits
			2020						2019						2020						2019
Regulatory assets (liabilities)			$	5,115					$	4,731					$	78					$	25
Accounts payable and accrued liabilities			(5)						(5)						(28)						(28)
Pension and post-retirement benefit obligations(1)			(5,711)						(5,327)						(516)						(471)

Note

(1) The table above excludes $390 million and $383 million of post-employment benefit costs that are recorded in Post-retirement and post-employment benefit obligations on the Consolidated Balance Sheets at September 30, 2020 and 2019, respectively.

Post-Retirement Benefit Costs Deferred as Regulatory Assets

Unrecognized amounts included in regulatory assets or liabilities yet to be recognized as components of accrued benefit cost at September 30, 2020 and 2019, consisted of the following:

Post-Retirement Benefit Costs Deferred as Regulatory Assets (Liabilities) At September 30
			Pension Benefits												Other Post-Retirement Benefits
			2020						2019						2020						2019
Unrecognized prior service credit			$	(615)					$	(714)					$	(112)					$	(135)
Unrecognized net loss			5,620						5,350						190						160
Amount capitalized due to actions of regulator			110						95						—						—
Total regulatory assets (liabilities)			$	5,115					$	4,731					$	78					$	25

Projected Benefit Obligations and Accumulated Benefit Obligations in Excess of Plan Assets

The projected benefit obligation, accumulated benefit obligation, and fair value of plan assets for the pension plan at September 30, 2020 and 2019, were as follows:

Projected Benefit Obligations and Accumulated Benefit Obligations in Excess of Plan Assets At September 30
			2020						2019
Projected benefit obligation			$	13,675					$	13,312
Accumulated benefit obligation			13,613						13,246
Fair value of net plan assets			7,959						7,980

Components of Net Periodic Benefit Cost

The components of net periodic benefit cost and other amounts recognized as changes in regulatory assets for the years ended September 30, 2020, 2019, and 2018 were as follows:

Components of Net Periodic Benefit Cost For the years ended September 30
			Pension Benefits																		Other Post-Retirement Benefits
			2020						2019						2018						2020						2019						2018
Service cost			$	55					$	44					$	53					$	16					$	11					$	14
Interest cost			415						499						473						16						18						19
Expected return on plan assets			(488)						(477)						(478)						—						—						—
Amortization of prior service credit			(97)						(99)						(99)						(24)						(24)						(22)
Recognized net actuarial loss			436						336						409						10						4						8
Total net periodic benefit cost as actuarially determined			321						303						358						18						9						19
Amount expensed (capitalized) due to actions of regulator			(15)						1						(54)						—						—						—
Net periodic benefit cost			$	306					$	304					$	304					$	18					$	9					$	19

Expected Amortization of Regulatory Assets in Next Fiscal Year

The amounts in the regulatory asset that are expected to be recognized as components of net periodic benefit cost during the next fiscal year are as follows:

Expected Amortization of Regulatory Assets in 2021 At September 30, 2020
			Pension Benefits						Other Post-Retirement Benefits						Total
Prior service credit			$	(97)					$	(18)					$	(115)
Net actuarial loss			447						12						459
Amounts expensed due to actions of regulator			28						—						28

Actuarial Assumptions

Actuarial Assumptions Utilized to Determine Benefit Obligations at September 30
			Pension Benefits												Other Post-Retirement Benefits
			2020						2019						2020						2019
Discount rate			2.75%						3.20%						3.05%						3.30%
Rate of compensation increase			3.43%						3.50%						N/A						N/A
Cost of living adjustment (COLA)(1)			2.00%						2.00%						2.00%						2.00%
Pre-Medicare eligible
Current health care cost trend rate(2)			N/A						N/A						6.50%						6.75%
Ultimate health care cost trend rate			N/A						N/A						5.00%						5.00%
Year ultimate trend rate is reached			N/A						N/A						2027						2027
Post-Medicare eligible
Current health care cost trend rate			N/A						N/A						—%						—%
Ultimate health care cost trend rate			N/A						N/A						4.00%						4.00%
Year ultimate trend rate is reached			N/A						N/A						2024						2023

Notes

(1) The COLA assumption is the ultimate long-term rate. The calendar year rate for 2021 is assumed to be one percent, and for years thereafter the ultimate is used.

(2) In 2019, TVA reset the pre-Medicare health care cost trend rates assumption with an initial rate of 6.75 percent, declining 0.25 percent per year until it reaches the ultimate rate of 5.00 percent in 2027. For 2020, TVA maintained this trend assumption for pre-Medicare per capita claims cost with a current health care cost rate of 6.50 percent. However, to account for cumulative delayed medical care due to the COVID-19 pandemic and the expected spending as the demand for care returns, the pre-Medicare per capita retiree contributions current health care cost trend rate is 11.93 percent, and in 2022 assumed to return to 6.25 percent in line with the health care cost trend rates assumption.

Actuarial Assumptions Utilized to Determine Net Periodic Benefit Cost for the Years Ended September 30(1)
			Pension Benefits																		Other Post-Retirement Benefits
			2020						2019						2018						2020						2019						2018
Discount rate			3.20		%				4.35		%				3.85		%				3.30		%				4.40		%				3.95		%
Expected return on plan assets(2)			6.75		%				6.75		%				6.75		%				N/A						N/A						N/A
Cost of living adjustment (COLA)(3)			2.00		%				2.00		%				2.00		%				2.00		%				2.00		%				2.00		%
Rate of compensation increase			3.43		%				3.50		%				5.34		%				N/A						N/A						N/A
Pre-Medicare eligible
Current health care cost trend rate			N/A						N/A						N/A						6.75		%				6.25		%				6.50		%
Ultimate health care cost trend rate			N/A						N/A						N/A						5.00		%				5.00		%				5.00		%
Year ultimate trend rate is reached			N/A						N/A						N/A						2027						2024						2024
Post-Medicare eligible
Current health care cost trend rate			N/A						N/A						N/A						—		%				—		%				—		%
Ultimate health care cost trend rate			N/A						N/A						N/A						4.00		%				4.00		%				4.00		%
Year ultimate trend rate is reached			N/A						N/A						N/A						2023						2021						2021

Notes

(1) The actuarial assumptions used to determine the benefit obligations at September 30 of each year are subsequently used to determine net periodic benefit cost

for the following year except the rate of compensation increase assumption.

(2) The actual return on assets for 2020, 2019, and 2018 were 5.11%, 4.99%, and 5.84%, respectively.

(3) The COLA assumption is the ultimate rate. The actual calendar year rate is used in determining the expense, and for years thereafter the ultimate rate is used.

Sensitivity to Certain Changes in Pension Assumptions

The following chart reflects the sensitivity of pension cost to changes in certain actuarial assumptions:

Sensitivity to Certain Changes in Pension Assumptions At September 30, 2020
Actuarial Assumption						Change in Assumption						Impact on 2020 Pension Cost						Impact on 2020 Projected Benefit Obligation
Discount rate						(0.25)		%				$	17					$	418
Rate of return on plan assets						(0.25)		%				18						N/A
Cost of living adjustments						0.25		%				30						270

Sensitivity to Changes in Assumed Health Care Cost Trend Rates

The following chart reflects the sensitivity of post-retirement benefit cost to changes in the health care trend rate:

Sensitivity to Changes in Assumed Health Care Cost Trend Rates At September 30, 2020
			1% Increase						1% Decrease
Effect on total of service and interest cost components for the year			$	4					$	(4)
Effect on end-of-year accumulated post-retirement benefit obligation			70						(68)

Asset Holdings and Fair Value Measurements

s consistent with the asset allocation policy. At September 30, 2020 and 2019, the asset holdings of TVARS included the following:

Asset Holdings of TVARS At September 30
												Plan Assets at September 30
Asset Category						Target Allocation						2020						2019
Global public equity						32		%				36		%				37		%
Private equity						8		%				13		%				10		%
Safety oriented fixed income						20		%				18		%				18		%
Opportunistic fixed income						20		%				15		%				12		%
Public real assets						10		%				10		%				15		%
Private real assets						10		%				8		%				8		%
Total						100		%				100		%				100		%

Fair Value Measurements

    The following table provides the fair value measurement amounts for assets held by TVARS at September 30, 2020:

TVA Retirement System At September 30, 2020
			Total(1)(2)						Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1)						Significant Other Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)
Assets
Equity securities			$	1,624					$	1,621					$	—					$	3
Preferred securities			11						—						11						—
Debt securities
Corporate debt securities			1,421						—						1,418						3
Residential mortgage-backed securities			317						—						314						3
Debt securities issued by U.S. Treasury			701						701						—						—
Debt securities issued by foreign governments			231						—						179						52
Asset-backed securities			116						—						88						28
Debt securities issued by state/local governments			23						—						23						—
Commercial mortgage-backed securities			91						—						86						5
Commingled funds measured at net asset value(3)
Equity			931						—						—						—
Debt			203						—						—						—
Blended			102						—						—						—
Institutional mutual funds			277						277						—						—
Cash equivalents and other short-term investments			338						77						261						—
Private credit measured at net asset value(3)			166						—						—						—
Private equity measured at net asset value(3)			1,003						—						—						—
Private real assets measured at net asset value(3)			629						—						—						—
Securities lending collateral			167						—						167						—
Derivatives
Futures			3						3						—						—
Swaps			10						—						10						—
Options			2						—						2						—
Foreign currency forward receivable			2						—						2						—
Total assets			$	8,368					$	2,679					$	2,561					$	94
Liabilities
Derivatives
Futures			$	1					$	1					$	—					$	—
Foreign currency forward payable			3						—						3						—
Swaps			6						—						6						—
Options			2						—						2						—
Securities sold under agreements to repurchase			123						—						123						—
Total liabilities			$	135					$	1					$	134					$	—

Notes

(1)  Excludes approximately $107 million in net payables associated with security purchases and sales and various other payables.

(2)  Excludes a $167 million payable for collateral on loaned securities in connection with TVARS's participation in securities lending programs.

(3) In accordance with Subtopic 820-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy.

    The following table provides the fair value measurement amounts for assets held by TVARS at September 30, 2019:

TVA Retirement System At September 30, 2019
			Total(1)(2)						Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1)						Significant Other Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)
Assets
Equity securities			$	1,766					$	1,762					$	—					$	4
Preferred securities			10						1						9						—
Debt securities
Corporate debt securities			1,387						—						1,382						5
Residential mortgage-backed securities			427						—						424						3
Debt securities issued by U.S. Treasury			807						807						—						—
Debt securities issued by foreign governments			210						—						209						1
Asset-backed securities			144						—						116						28
Debt securities issued by state/local governments			18						—						18						—
Commercial mortgage-backed securities			81						—						80						1
Commingled funds measured at net asset value(3)
Equity			795						—						—						—
Debt			308						—						—						—
Commodities			217						—						—						—
Blended			125						—						—						—
Institutional mutual funds			97						97						—						—
Cash equivalents and other short-term investments			329						1						328						—
Certificates of deposit			3						—						3						—
Private credit measured at net asset value(3)			78						—						—						—
Private equity measured at net asset value(3)			778						—						—						—
Private real assets measured at net asset value(3)			659						—						—						—
Securities lending collateral			224						—						224						—
Derivatives
Futures			2						2						—						—
Swaps			5						—						5						—
Options			1						—						1						—
Foreign currency forward receivable			1						—						1						—
Total assets			$	8,472					$	2,670					$	2,800					$	42
Liabilities
Derivatives
Futures			$	4					$	4					$	—					$	—
Foreign currency forward payable			1						—						1						—
Swaps			12						—						12						—
Options			1						—						1						—
Securities sold under agreements to repurchase			118						—						118						—
Total liabilities			$	136					$	4					$	132					$	—

cNotes

(1)  Excludes approximately $132 million in net payables associated with security purchases and sales and various other payables.

(2)  Excludes a $224 million payable for collateral on loaned securities in connection with TVARS's participation in securities lending programs.

Fair Value Measurements Using Significant Unobservable Inputs

The following table provides a reconciliation of beginning and ending balances of pension plan assets measured at fair value on a recurring basis where the determination of fair value includes significant unobservable inputs (Level 3):

Fair Value Measurements Using Significant Unobservable Inputs
			Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Balance at October 1, 2018			$	58
Net realized/unrealized gains (losses)			4
Purchases, sales, issuances, and settlements (net)			(12)
Transfers in and/or out of Level 3			(8)
Balance at September 30, 2019			42
Net realized/unrealized gains (losses)			46
Purchases, sales, issuances, and settlements (net)			11
Transfers in and/or out of Level 3			(5)
Balance at September 30, 2020			$	94

Estimated Future Benefit Payments

Cash Flows

Estimated Future Benefit Payments.  The following table sets forth the estimated future benefit payments under the benefit plans.

Estimated Future Benefits Payments At September 30, 2020
			Pension Benefits(1)						Other Post-Retirement Benefits
2021			$	777					$	28
2022			776						26
2023			773						24
2024			768						23
2025			767						22
2026 - 2030			3,741						117

Note

(1) Participants are assumed to receive the Fixed Fund in a lump sum in lieu of available annuity options allowed for certain grandfathered participants resulting in higher estimated pension benefits payments.

Amounts recognized on Consolidated Balance Sheets

Amounts Recognized on TVA's Consolidated Balance Sheets At September 30
			2020						2019
Accounts payable and accrued liabilities			$	—					$	36
Post-retirement and post-employment benefit obligations			390						383

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Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration