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Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Tables)
 12 Months Ended
Sep. 30, 2016
Quarterly Financial Information Disclosure [Abstract]  
Unaudited Quarterly Financial Information
Unaudited Quarterly Financial Information

2016
 
First
 
Second
 
Third
 
Fourth
 
Total
Operating revenues
$
2,280

 
$
2,571

 
$
2,479

 
$
3,286

 
$
10,616

Operating expenses
2,052

 
1,982

 
1,913

 
2,343

 
8,290

Operating income
228

 
589

 
566

 
943

 
2,326

Net income (loss)
(37
)
 
318

 
291

 
661

 
1,233


Unaudited Quarterly Financial Information

2015
 
First
 
Second
 
Third
 
Fourth
 
Total
Operating revenues
$
2,411

 
$
2,863

 
$
2,558

 
$
3,171

 
$
11,003

Operating expenses
2,047

 
2,087

 
2,252

 
2,402

 
8,788

Operating income
364

 
776

 
306

 
769

 
2,215

Net income (loss)
81

 
496

 
32

 
502

 
1,111