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Impact of New Accounting Standards and Interpretations Impact of New Accounting Standards and Interpretations (Tables)
 3 Months Ended
Dec. 31, 2020
Accounting Changes and Error Corrections [Abstract]  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles Impact of New Accounting Standards and Interpretations     
    The following are accounting standard updates issued by the Financial Accounting Standards Board ("FASB") that TVA adopted during 2021:
Financial Instruments - Credit Losses
DescriptionThis guidance eliminates the probable initial recognition threshold in current GAAP and, instead, requires an allowance to be recorded for all expected credit losses for certain financial assets that are not measured at fair value. The allowance for credit losses is based on historical information, current conditions, and reasonable and supportable forecasts. The new standard also makes revisions to the other than temporary impairment model for available-for-sale debt securities.
Effective Date for TVAOctober 1, 2020
Effect on the Financial Statements or Other Significant MattersTVA adopted this standard on a modified retrospective method through a cumulative-effect adjustment to retained earnings on October 1, 2020. TVA recorded an initial transition adjustment of $4 million to retained earnings. The adoption of this standard did not materially impact TVA's financial condition, results of operations, or cash flows.
Fair Value Measurement Disclosure
DescriptionThis guidance changes certain disclosure requirements for fair value measurements. It removes certain disclosure requirements, such as the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy; the policy for timing of the transfers between levels; and the valuation processes for Level 3 fair value measurements.  Some disclosure requirements are added, such as the change in unrealized gains and losses included in other comprehensive income for recurring Level 3 fair value measurements and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements.
Effective Date for TVAOctober 1, 2020
Effect on the Financial Statements or Other Significant MattersAdoption of this standard did not have a material impact on TVA's financial condition, results of operations, or cash flows.
    
The following accounting standard has been issued but at December 31, 2020, was not effective and had not been adopted by TVA:
Reference Rate Reform
DescriptionThis guidance provides temporary optional expedients and exceptions to the guidance in GAAP on contract modifications and hedge accounting to ease the financial reporting burdens related to the expected market transition from the London Interbank Offered Rate ("LIBOR") and other interbank offered rates to alternative reference rates, such as the Secured Overnight Financing Rates.
Effective Date for TVAThe new standard is effective for adoption at any time between March 12, 2020, and December 31, 2022. TVA currently plans to adopt the standard by December 31, 2022.
Effect on the Financial Statements or Other Significant MattersTVA continues to review this standard and evaluate the impact of using an alternative reference rate instead of LIBOR in its interest rate swap contracts. TVA does not expect the adoption of this standard to have a material impact on TVA's financial condition, results of operations, or cash flows.