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Benefit Plans Actuarial Assumptions (Details) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
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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% |

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- Definition The cost of living adjustment percentage used for defined benefit plans. + References No definition available. + Details
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- Definition Minimum percentage increase in twelve-month average CPI-U necessary to receive COLA. + References No definition available. + Details
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- Definition Number of years during which cost of living adjustment changed. + References No definition available. + Details
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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. + Details
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- Definition Retirement age of eligibility for cost of living adjustment after January 1, 2010. + References No definition available. + Details
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- Definition Retirement age of eligibility for cost of living adjustment before January 1, 2010. + References No definition available. + Details
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- 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 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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)(2) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money. + 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 + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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)(2) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 + Details
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- Definition The ultimate trend rate for health care costs. + 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 + Details
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