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Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Details) (USD $)
 12 Months Ended 30 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Jul. 31, 2005
Units
Sep. 30, 2014
Deferred Nuclear Generating Units and Construction Costs
Jul. 31, 2005
Deferred Nuclear Generating Units and Construction Costs
Sep. 30, 2014
Environmental Cleanup Costs - Kingston Ash Spill
Sep. 30, 2010
Environmental Cleanup Costs - Kingston Ash Spill
Sep. 30, 2009
Environmental Cleanup Costs - Kingston Ash Spill
Sep. 30, 2014
Environmental Agreements
Sep. 30, 2014
Energy Efficiency Projects
Environmental Agreements
Sep. 30, 2014
Paid to States
Environmental Agreements
Sep. 30, 2014
Civil Penalties
Environmental Agreements
Sep. 30, 2014
Derivatives Under FTP
Sep. 30, 2013
Derivatives Under FTP
Sep. 30, 2014
Deferred nuclear generating units
Regulatory Assets and Liabilities                                
Net unrealized gains (losses)                           $ 103,000,000 [1] $ 166,000,000 [1]  
Investment in deferred generating units           3,900,000,000                    
Number of deferred generating units       2                        
Regulatory Noncurrent Asset, Amortization Period         P10Y                      
Remaining balance to be included in plant asset balance at completion         619,000,000                      
Regulatory Assets 9,475,000,000 9,475,000,000 9,692,000,000                         1,500,000,000
Yearly amortization of Deferred nuclear generating units 237,000,000                              
Initial regulatory asset                   360,000,000            
Investment in environmental agreement projects                   290,000,000            
Amount to be provided to fund environmental projects                   60,000,000            
Amount to be paid in civil penalties                   10,000,000            
Regulatory asset amount expensed                     138,000,000 50,000,000 10,000,000      
Total recorded estimate of Kingston cleanup costs 1,100,000,000 1,100,000,000         1,100,000,000   933,000,000              
Kingston insurance recoveries 175,000,000 267,000,000                            
Estimate increase               $ 192,000,000                
Current regulatory asset amortization period             12 months                  
[1] Fair values of certain derivatives under the FTP that were in net liability positions totaling $69 million and $100 million at September 30, 2014 and September 30, 2013, respectively, are recorded in TVA's margin cash accounts in Other current assets. These derivatives are transacted with futures commission merchants, and cash deposits have been posted to the margin cash accounts held with each futures commission merchant to offset the net liability positions in full.