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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2014
Accounting Policies [Abstract]  
Allowance for Uncollectible Accounts [Table Text Block]
The following table contains information about TVA’s current estimates related to uncollectible accounts.
Allowance for Uncollectible Accounts
(in millions)
 
 
Description
 
Balance at beginning of year
 
Additions charged to expense
 
 
 Deductions
 
 
Balance at end of year
For the year ended September 30, 2014
 
 
 
 
 
 
 
 
Allowance for uncollectible accounts
 
 
 
 
 
 
 
 
Receivables
 
$
1

 
$
1

 
$
(1
)
 
$
1

Loans
 
10

 
—

 
(1
)
 
9

 
 
 
 
 
 
 
 
 
Total allowances deducted from assets
 
$
11

 
$
1

 
$
(2
)
 
$
10

For the year ended September 30, 2013
 
 

 
 

 
 

 
 

Allowance for uncollectible accounts
 
 

 
 

 
 

 
 

Receivables
 
$
7

 
$
—

 
$
(6
)
 
$
1

Loans
 
12

 
—

 
(2
)
 
10

 
 
 
 
 
 
 
 
 
Total allowances deducted from assets
 
$
19

 
$
—

 
$
(8
)
 
$
11

For the year ended September 30, 2012
 
 

 
 

 
 

 
 

Allowance for uncollectible accounts
 
 

 
 

 
 

 
 

Receivables
 
$
1

 
$
6

 
$
—

 
$
7

Loans
 
11

 
1

 
—

 
12

 
 
 
 
 
 
 
 
 
Total allowances deducted from assets
 
$
12

 
$
7

 
$
—

 
$
19
Property, Plant, and Equipment Depreciation Rates
Average depreciation rates by asset class are as follows:
Property, Plant, and Equipment Depreciation Rates
At September 30
(percent)
 
2014
 
2013
 
2012
Asset Class
 
Nuclear
2.90

 
2.86

 
2.71

Coal-Fired
4.37

 
3.47

 
5.65

Hydroelectric
1.44

 
1.30

 
1.35

Gas and oil-fired
3.23

 
3.21

 
3.67

Transmission
2.76

 
2.76

 
2.99

Other
8.40

 
8.14

 
8.10