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Proprietary Capital Proprietary Capital (Tables)
 12 Months Ended
Sep. 30, 2018
Stockholders' Equity Note [Abstract]  
Summary of Proprietary Capital Activity
The table below summarizes TVA's activities related to appropriated funds and retained earnings.
Summary of Proprietary Capital Activity
At or for the years ended September 30
 
2018
 
2017
 
Power Program
 
Nonpower
 Programs
 
Power Program
 
Nonpower
 Programs
Appropriation Investment
$
258

 
$
4,351

 
$
258

 
$
4,351

Retained Earnings
 

 
 

 
 

 
 

Balance at beginning of year
8,282

 
(3,779
)
 
7,594

 
(3,771
)
Net income (expense) for year
1,127

 
(8
)
 
693

 
(8
)
Return on power program appropriation investment
(5
)
 
—

 
(5
)
 
—

Balance at end of year
9,404

 
(3,787
)
 
8,282

 
(3,779
)
Net proprietary capital at September 30
$
9,662

 
$
564

 
$
8,540

 
$
572