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Other Long-Term Liabilities (Tables)
 9 Months Ended
Jun. 30, 2018
Other Liabilities, Noncurrent [Abstract]  
Other Long-Term Liabilities
The table below summarizes the types and amounts of Other long-term liabilities:
Other Long-Term Liabilities
 
At June 30, 2018
 
At September 30, 2017
Interest rate swap liabilities
$
1,176

 
$
1,418

Gallatin coal combustion residual facilities liability
875

 
880

Capital lease obligations
179

 
182

EnergyRight® financing obligation
105

 
115

Currency swap liabilities
73

 
92

Commodity contract derivative liabilities
14

 
9

Membership interests of VIE subject to mandatory redemption
29

 
30

Environmental agreements liability
11

 
13

Other
304

 
316

Total other long-term liabilities
$
2,766

 
$
3,055