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Debt and Other Obligations Debt and Other Obligations - Debt Outstanding (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 Electronotes | Sep. 30, 2013
Short-term debt |  |  |  |
Short-term debt, net of discounts | $ 596 |  | $ 2,432 |
Current maturities of long-term debt of variable interest entities | 32 |  | 30 |
Current maturities of power bonds | 1,032 |  | 32 |
Total current debt outstanding, net | 1,660 |  | 2,494 |
Long-term debt |  |  |  |
Unamortized discount, premiums and other | (89) |  | (85) |
Long-term debt of variable interest entities | 1,279 |  | 1,311 |
Total long-term debt, net | 23,227 |  | 23,626 |
Long-term power bonds | 22,037 | [1] | 22,400 | [1]
Long-term Debt, net | 21,948 |  | 22,315 |
Current maturities of power bonds | 1,032 |  | 32 |
Foreign currency exchange loss | 44 |  | 43 |
Number of issues with partial maturities | 1 |  |  |
Electronotes |  |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 387 | [2] | 723 | [2]
Maturity date - earliest | May 15, 2020 |  |  |
Maturity date - latest | Feb. 15, 2043 |  |  |
Coupon rate - minimum | 2.375% |  |  |
Coupon rate - maximum | 4.375% |  |  |
Call date - earliest | Feb. 15, 2015 |  |  |
Call date - latest | Feb. 15, 2018 |  |  |
880591DY5 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Jun. 15, 2015 |  |  |
Coupon rate | 4.375% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 0 |  | 1,000 |
880591EE8 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Nov. 15, 2015 |  |  |
Coupon rate | 2.25% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 2 | [3] | 4 | [3]
880591DS8 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Dec. 15, 2016 |  |  |
Coupon rate | 4.875% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 524 |  | 524 |
880591EA6 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Jul. 18, 2017 |  |  |
Coupon rate | 5.50% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 1,000 |  | 1,000 |
880591CU4 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Dec. 15, 2017 |  |  |
Coupon rate | 6.25% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 650 |  | 650 |
880591EC2 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Apr. 01, 2018 |  |  |
Coupon rate | 4.50% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 1,000 |  | 1,000 |
880591EQ1 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Oct. 15, 2018 |  |  |
Coupon rate | 1.75% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 1,000 |  | 1,000 |
880591EL2 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Feb. 15, 2021 |  |  |
Coupon rate | 3.875% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 1,500 |  | 1,500 |
880591DC3 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Jun. 07, 2021 |  |  |
Coupon rate | 5.805% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 324 | [4] | 324 | [4]
880591EN8 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Aug. 15, 2022 |  |  |
Coupon rate | 1.875% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 1,000 |  | 1,000 |
880591ER9 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Sep. 15, 2024 |  |  |
Coupon rate | 2.875% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 1,000 |  | 0 |
880591CJ9 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Nov. 01, 2025 |  |  |
Coupon rate | 6.75% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 1,350 |  | 1,350 |
880591300 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Jun. 01, 2028 |  |  |
Coupon rate | 3.83% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 324 | [5] | 324 | [5]
880591409 |  |  |  |
Debt Instrument |  |  |  |
Maturity | May 01, 2029 |  |  |
Coupon rate | 3.955% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 270 | [5] | 270 | [5]
880591DM1 |  |  |  |
Debt Instrument |  |  |  |
Maturity | May 01, 2030 |  |  |
Coupon rate | 7.125% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 1,000 |  | 1,000 |
880591DP4 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Jun. 07, 2032 |  |  |
Coupon rate | 6.587% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 406 | [4] | 405 | [4]
880591DV1 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Jul. 15, 2033 |  |  |
Coupon rate | 4.70% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 472 |  | 472 |
880591EF5 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Jun. 15, 2034 |  |  |
Coupon rate | 3.77% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 388 | [3] | 414 | [3]
880591DX7 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Jun. 15, 2035 |  |  |
Coupon rate | 4.65% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 436 |  | 436 |
880591CK6 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Apr. 01, 2036 |  |  |
Coupon rate | 5.98% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 121 |  | 121 |
880591CS9 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Apr. 01, 2036 |  |  |
Coupon rate | 5.88% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 1,500 |  | 1,500 |
880591CP5 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Jan. 15, 2038 |  |  |
Coupon rate | 6.15% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 1,000 |  | 1,000 |
880591ED0 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Jun. 15, 2038 |  |  |
Coupon rate | 5.50% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 500 |  | 500 |
880591EH1 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Sep. 15, 2039 |  |  |
Coupon rate | 5.25% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 2,000 |  | 2,000 |
880591EP3 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Dec. 15, 2042 |  |  |
Coupon rate | 3.50% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 1,000 |  | 1,000 |
880591DU3 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Jun. 07, 2043 |  |  |
Coupon rate | 4.962% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 243 | [4] | 243 | [4]
880591CF7 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Jul. 15, 2045 |  |  |
Coupon rate | 6.235% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 140 |  | 140 |
Call date - earliest | Jul. 15, 2020 |  |  |
880591EB4 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Jan. 15, 2048 |  |  |
Coupon rate | 4.875% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 500 |  | 500 |
880591DZ2 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Apr. 01, 2056 |  |  |
Coupon rate | 5.375% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 1,000 |  | 1,000 |
880591EJ7 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Sep. 15, 2060 |  |  |
Coupon rate | 4.625% |  |  |
Long-term debt |  |  |  |
Long-term Debt, net | 1,000 |  | 1,000 |
880591EE8 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Nov. 15, 2014 |  |  |
Coupon rate | 2.25% |  |  |
Long-term debt |  |  |  |
Current maturities of power bonds | 3 |  | 3 |
880591EF5 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Dec. 15, 2014 |  |  |
Coupon rate | 3.77% |  |  |
Long-term debt |  |  |  |
Current maturities of power bonds | 26 |  | 26 |
880591CW0 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Jun. 15, 2015 |  |  |
Coupon rate | 4.375% |  |  |
Long-term debt |  |  |  |
Current maturities of power bonds |  |  | 0 |
880591DY5 |  |  |  |
Long-term debt |  |  |  |
Current maturities of power bonds | 1,000 |  |  |
88059TEL1 |  |  |  |
Debt Instrument |  |  |  |
Maturity | Nov. 15, 2014 |  |  |
Coupon rate | 2.65% |  |  |
Long-term debt |  |  |  |
Current maturities of power bonds | $ 3 |  | $ 3 |
[1] | Includes net exchange losses from currency transactions of $44 million at September 30, 2014 and $43 million at September 30, 2013.
[2] | Includes one electronotes® issue with partial maturities of principal for each required annual payment.
[3] | These Bonds include partial maturities of principal for each required annual payment.
[4] | The coupon rate represents TVA’s effective interest rate.
[5] | TVA PARRS, CUSIP numbers 880591300 and 880591409, may be redeemed under certain conditions. See Put and Call Options.

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- Definition Reflects the cumulative amount of fees paid by borrowers, which relationship is not otherwise defined (such as commercial, consumer, or foreign), which have not yet been taken into income and unamortized costs incurred to originate loans and leases, not otherwise categorized (such as commercial, consumer, or foreign), unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans, not otherwise categorized (such as commercial, consumer, or foreign), that are being amortized into income as an adjustment to yield. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533 + Details
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- Definition Carrying value as of the balance sheet date of the portion of long-term, uncollateralized debt obligations due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 + Details
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- Definition Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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