Document and Entity Information Document - shares |
6 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Apr. 17, 2017 |
|
| Document and Entity Information [Abstract] | ||
| Entity Registrant Name | ROCKWELL COLLINS INC | |
| Entity Central Index Key | 0001137411 | |
| Document and Entity Information | --09-30 | |
| Entity Filer Category | Large Accelerated Filer | |
| Entity Registrant Name | 10-Q | |
| Document Period End Date | Mar. 31, 2017 | |
| Document Fiscal Year Focus | 2017 | |
| Document Fiscal Period Focus | Q2 | |
| Amendment Flag | false | |
| Entity Common Stock, Shares Outstanding | 162,383,463 | |
| Well known seasoned issuer | Yes | |
| Voluntary filer | No | |
| Current reporting status | Yes |