Amount classified as assets attributable to disposal group held for sale or disposed of.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Discontinued Operations Assets and Liabilities Held for Sale (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended	24 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2018
Assets and Liabilities Held for Sale [Line Items]
Assets held for sale			$ 158	$ 147	$ 8,203
Building Solutions Asia Pacific \| Individually immaterial disposal group [Member]
Assets and Liabilities Held for Sale [Line Items]
Assets held for sale				147
Global Products
Assets and Liabilities Held for Sale [Line Items]
Impairment of Long-Lived Assets to be Disposed of	$ 15	$ 235	$ 235	$ 250