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Proprietary Capital Proprietary Capital (Tables)
 12 Months Ended
Sep. 30, 2013
Stockholders' Equity Note [Abstract]  
Summary of Proprietary Capital Activity
The table below summarizes TVA's activities related to appropriated funds.
Summary of Proprietary Capital Activity
At or for the Years Ended September 30
 
2013
 
2012
Appropriation Investment
Power Program
 
Nonpower
 Programs
 
Power Program
 
Nonpower
 Programs
Balance at beginning of year
$
288

 
$
4,351

 
$
308

 
$
4,351

Return of power program appropriation investment
(20
)
 
—

 
(20
)
 
—

Balance at end of year
268

 
4,351

 
288

 
4,351

Retained Earnings
 

 
 

 
 

 
 

Balance at beginning of year
4,492

 
(3,731
)
 
4,429

 
(3,721
)
Net income (expense) for year
282

 
(11
)
 
70

 
(10
)
Return on power program appropriation investment
(7
)
 
—

 
(7
)
 
—

Balance at end of year
4,767

 
(3,742
)
 
4,492

 
(3,731
)
Net proprietary capital at September 30
$
5,035

 
$
609

 
$
4,780

 
$
620