Acquisitions, Goodwill and Intangible Assets - Summary of the Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions		3 Months Ended
	Apr. 13, 2017	Dec. 31, 2017	Sep. 30, 2017
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill		$ 9,206	$ 9,158
B/E Aerospace
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Cash and cash equivalents	$ 104
Receivables, net	485
Inventories, net	545
Other current assets	56
Property	279
Intangible Assets	1,586
Other Assets	53
Total Identifiable Assets Acquired	3,108
Accounts payable	(234)
Compensation and benefits	(75)
Advance payments from customers	(62)
Accrued customer incentives	(48)
Product warranty costs	(117)
Other current liabilities	(365)
Long-term Debt, Net	(2,119)
Retirement Benefits	(12)
Deferred Income Tax Liability	(335)
Other Liabilities	(431)
Total Liabilities Assumed	(3,798)
Net Identifiable Assets Acquired, excluding Goodwill	(690)
Goodwill	7,226
Net Assets Acquired	6,536
Adjustment to inventories at fair value	74
Adjustment to existing long-term contracts	$ 486
B/E Aerospace | Cost of Sales
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Adjustment to existing long-term contracts		$ 30