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Benefit Plans Actuarial Assumptions (Details)	12 Months Ended					12 Months Ended			12 Months Ended						12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2010	Sep. 30, 2009	Sep. 30, 2014 Pension Benefits	Sep. 30, 2013 Pension Benefits	Sep. 30, 2012 Pension Benefits	Sep. 30, 2014 Other Post-retirement Benefits	Sep. 30, 2013 Other Post-retirement Benefits	Sep. 30, 2012 Other Post-retirement Benefits	Sep. 30, 2011 Other Post-retirement Benefits	Sep. 30, 2014 Minimum	Sep. 30, 2014 Maximum	Sep. 30, 2015 Scenario, Forecast [Member]	Sep. 30, 2020 Scenario, Forecast [Member]
Defined Benefit Plan Disclosure
Discount rate						4.45%	5.00%	4.00%	4.50%	5.05%	4.00%
Rate of compensation increase	5.70%	5.72%				5.70%	5.72%						3.50%	13.00%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year									7.50%	8.00%	8.50%	8.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate									5.00%	5.00%	5.00%
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate									2019	2019
Discount rate						5.00%	4.00%		5.05%	4.00%
Expected return on plan assets	7.25%	7.25%	7.25%			7.25%	7.25%								7.00%
Period during which actual company compensation experience study performed	5 years
Rate of compensation increase	5.72%	4.44%	4.43%			5.72%	4.44%
Minimum percentage increase in twelve-month average CPI-U necessary to receive COLA	1.00%
Number of years during which cost of living adjustment changed				4 years
Retirement age of eligibility for cost of living adjustment after January 1, 2010				60
Retirement age of eligibility for cost of living adjustment before January 1, 2010				55
Cost of living adjustment assumption	2.00%	1.60%			2.50%								1.00%	5.00%		2.50%
Rate of inflation															2.00%

X

- Definition

The cost of living adjustment percentage used for defined benefit plans.

+ References

No definition available.

+ Details

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X

- Definition

Minimum percentage increase in twelve-month average CPI-U necessary to receive COLA.

+ References

No definition available.

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- Definition

Number of years during which cost of living adjustment changed.

+ References

No definition available.

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- Definition

The period in which an actual compensation experience study is performed at TVA to determine assumptions related to compensation increases for defined benefit plans.

+ References

No definition available.

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- Definition

Rate of inflation.

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- Definition

Retirement age of eligibility for cost of living adjustment after January 1, 2010.

+ References

No definition available.

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- Definition

Retirement age of eligibility for cost of living adjustment before January 1, 2010.

+ References

No definition available.

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X

- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(1)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(2)

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- Definition

The interest rate used to adjust for the time value of money.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(1)

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512013



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- Definition

Expected rate of compensation increases (for pay-related plans).

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

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-Paragraph 1

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (l)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920



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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Health Care Cost Trend Rate

-URI http://asc.fasb.org/extlink&oid=6514820

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- Definition

The ultimate trend rate for health care costs.

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Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

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