Business Segment Information (Tables)
 6 Months Ended
Mar. 31, 2016
Segment Reporting [Abstract]  
Sales and Earnings of Continuing Operations of Operating Segments
ales and earnings from continuing operations of the Company's operating segments are summarized as follows:
 
Three Months Ended
 
Six Months Ended
 
March 31
 
March 31
(in millions)
2016
 
2015
 
2016
 
2015
Sales:
 
 
 
 
 
 
 
Commercial Systems
$
611

 
$
619

 
$
1,173

 
$
1,187

Government Systems
538

 
567

 
989

 
1,076

Information Management Services
162

 
155

 
318

 
304

Total sales
$
1,311

 
$
1,341

 
$
2,480

 
$
2,567

 
 
 
 
 
 
 
 
Segment operating earnings:
 

 
 

 
 
 
 
Commercial Systems
$
135

 
$
142

 
$
260

 
$
267

Government Systems
108

 
114

 
194

 
220

Information Management Services
29

 
22

 
53

 
43

Total segment operating earnings
272

 
278

 
507

 
530

 
 
 
 
 
 
 
 
Interest expense
(17
)
 
(15
)
 
(32
)
 
(30
)
Stock-based compensation
(9
)
 
(7
)
 
(15
)
 
(12
)
General corporate, net
(11
)
 
(15
)
 
(23
)
 
(29
)
Restructuring and asset impairment charges
—

 
—

 
(45
)
 
—

 
 
 
 
 
 
 
 
Income from continuing operations before income taxes
235

 
241

 
392

 
459

Income tax expense
(63
)
 
(78
)
 
(87
)
 
(127
)
Income from continuing operations
$
172

 
$
163

 
$
305

 
$
332
Summary of Sales by Product Category
The following table summarizes sales by category for the three and six months ended March 31, 2016 and 2015:
 
Three Months Ended
 
Six Months Ended
 
March 31
 
March 31
(in millions)
2016
 
2015
 
2016
 
2015
Commercial Systems sales categories:
 
 
 

 
 
 
 
Air transport aviation electronics
$
355

 
$
355

 
$
682

 
$
693

Business and regional aviation electronics
256

 
264

 
491

 
494

Commercial Systems sales
611

 
619

 
1,173

 
1,187

 
 
 
 
 
 
 
 
Government Systems sales categories:
 
 
 
 
 
 
 
Avionics
357

 
371

 
650

 
698

Communication and navigation
181

 
196

 
339

 
378

Government Systems sales
538

 
567

 
989

 
1,076

 
 
 
 
 
 
 
 
Information Management Services sales
162

 
155

 
318

 
304

 
 
 
 
 
 
 
 
Total sales
$
1,311

 
$
1,341

 
$
2,480

 
$
2,567