Equity and Noncontrolling Interests - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Dec. 31, 2019	Jun. 30, 2021	Jun. 30, 2020
Equity [Abstract]
Change in noncontrolling interest share	$ 18	$ 3	$ 18

Net Increase or Decrease in balance of noncontrolling interest in the subsidiary during the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=123454820&loc=SL4568740-111683

Name:	us-gaap_MinorityInterestPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration