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Percentage-of-Completion Contracts	3 Months Ended
Percentage-of-Completion Contracts	Dec. 31, 2017
Disclosure Percentage Of Completion Contracts Additional Information [Abstract]
Percentage-of-Completion Contracts	Percentage-of-Completion Contracts The Building Technologies & Solutions business records certain long-term contracts under the percentage-of-completion method of accounting. Under this method, sales and gross profit are recognized as work is performed based on the relationship between actual costs incurred and total estimated costs at completion. The Company records costs and earnings in excess of billings on uncompleted contracts primarily within accounts receivable - net and billings in excess of costs and earnings on uncompleted contracts primarily within deferred revenue in the consolidated statements of financial position. Costs and earnings in excess of billings related to these contracts were $975 million and $908 million at December 31, 2017 and September 30, 2017, respectively. Billings in excess of costs and earnings related to these contracts were $567 million and $451 million at December 31, 2017 and September 30, 2017, respectively.