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Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Components of TVA's Benefit Plans        
Number of defined benefit plans     1  
Number of definied contribution plans     1  
Number of unfunded post-retirement health care plans     2  
During the nine months ended June 30, 2012, TVA did not make contributions to its qualified defined benefit pension plan.     $ 0  
Net cash paid for other benefit costs     31 30
Pension Benefits
        
Components of TVA's Benefit Plans        
Service cost 34 30 103 90
Interest cost 123 126 368 377
Expected return on plan assets (109) (122) (327) (366)
Amortization of prior service cost (6) (6) (18) (18)
Recognized net actuarial loss 90 71 270 212
Net periodic benefit cost as actuarially determined 132 99 396 295
Amount charged (capitalized) due to actions of regulator 0 3 0 9
Total net periodic benefit cost recognized 132 102 396 304
Other Post-retirement Benefits
        
Components of TVA's Benefit Plans        
Service cost 5 4 14 10
Interest cost 9 8 27 24
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (1) (2) (4) (5)
Recognized net actuarial loss 8 5 23 16
Net periodic benefit cost as actuarially determined 21 15 60 45
Amount charged (capitalized) due to actions of regulator 0 0 0 0
Total net periodic benefit cost recognized $ 21 $ 15 $ 60 $ 45