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Summary of Significant Accounting Policies General and Basis of Presentation (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2013
People
variable_interest_entities
Dec. 31, 2012
Sep. 30, 2013
General and Basis of Presentation      
Population of TVA's service area 9,000,000    
Number of variable interest entities 3    
Period of time for customers to fulfill payment arrangements 90 days    
Allowance for uncollectible accounts, accounts receivable $ 1   $ 1
Loans and other long-term receivables, net 79   73
Loans and other long-term receivables, allowance 10   10
Depreciation expense 368 356  
Possible amount of future payments 175    
Payments attributable to BLEU fuel program 106    
BLEU fuel obligation $ 6