Acquisitions, Goodwill and Intangible Assets - Significant Adjustments for Pro Forma Results (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma net income	$ 280	$ 145
B/E Aerospace | Net reduction to depreciation resulting from fixed asset adjustments
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma net income	0	5
B/E Aerospace | Advisory, legal and accounting service fees
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma net income	0	26
B/E Aerospace | Amortization of acquired B/E Aerospace intangible assets, net
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma net income	0	(38)
B/E Aerospace | Interest expense incurred on acquisition financing, net
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma net income	0	(14)
B/E Aerospace | Long-term contract program adjustments
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma net income	0	(11)
B/E Aerospace | Acquired contract liability amortization
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma net income	0	21
B/E Aerospace | Compensation adjustments
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma net income	$ 0	$ 3