Business Segment Information (Summary of Sales by Product Category) (Details) - USD ($)
$ in Millions |
3 Months Ended |
6 Months Ended |
Mar. 31, 2017 |
Mar. 31, 2016 |
Mar. 31, 2017 |
Mar. 31, 2016 |
| Business Segment Information |
|
|
|
|
| Sales: |
$ 1,342
|
$ 1,311
|
$ 2,535
|
$ 2,480
|
| Commercial Systems [Member] |
|
|
|
|
| Business Segment Information |
|
|
|
|
| Sales: |
594
|
611
|
1,143
|
1,173
|
| Government Systems [Member] |
|
|
|
|
| Business Segment Information |
|
|
|
|
| Sales: |
565
|
538
|
1,040
|
989
|
| Information Management Services [Member] |
|
|
|
|
| Business Segment Information |
|
|
|
|
| Sales: |
183
|
162
|
352
|
318
|
| Air Transport Aviation Electronics [Member] | Commercial Systems [Member] |
|
|
|
|
| Business Segment Information |
|
|
|
|
| Sales: |
364
|
355
|
693
|
682
|
| Business And Regional Aviation Electronics [Member] | Commercial Systems [Member] |
|
|
|
|
| Business Segment Information |
|
|
|
|
| Sales: |
230
|
256
|
450
|
491
|
| Avionics [Member] | Government Systems [Member] |
|
|
|
|
| Business Segment Information |
|
|
|
|
| Sales: |
367
|
357
|
686
|
650
|
| Communication and Navigation [Member] | Government Systems [Member] |
|
|
|
|
| Business Segment Information |
|
|
|
|
| Sales: |
$ 198
|
$ 181
|
$ 354
|
$ 339
|