SEGMENTS - Total Assets by Segment (Details) - USD ($) $ in Millions	Dec. 28, 2019	Sep. 30, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 18,156	$ 16,255
Operating Segments | Power & Control
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	7,070	7,037
Operating Segments | Airframe
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	6,838	6,672
Operating Segments | Non- aviation
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	262	262
Corporate, Non-Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,986	1,322
Discontinued Operations, Held-for-sale [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 0	$ 962