Acquisitions, Goodwill and Intangible Assets (Changes in the carrying amount of goodwill) (Details) $ in Millions |
6 Months Ended |
|---|---|
|
Mar. 31, 2017
USD ($)
| |
| Goodwill | |
| Goodwill beginning balance | $ 1,919 |
| Foreign currency translation adjustments | (3) |
| Goodwill ending balance | 1,928 |
| Commercial Systems [Member] | |
| Goodwill | |
| Goodwill beginning balance | 326 |
| Pulse.aero acquisition | 0 |
| Foreign currency translation adjustments | (1) |
| Goodwill ending balance | 325 |
| Government Systems [Member] | |
| Goodwill | |
| Goodwill beginning balance | 503 |
| Pulse.aero acquisition | 0 |
| Foreign currency translation adjustments | (3) |
| Goodwill ending balance | 500 |
| Information Management Services [Member] | |
| Goodwill | |
| Goodwill beginning balance | 1,090 |
| Foreign currency translation adjustments | 1 |
| Goodwill ending balance | 1,103 |
| Pulse.aero [Member] | |
| Goodwill | |
| Pulse.aero acquisition | 12 |
| Pulse.aero [Member] | Information Management Services [Member] | |
| Goodwill | |
| Pulse.aero acquisition | $ 12 |