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Summary of Significant Accounting Policies - Additional Information (Detail) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended	9 Months Ended
	Jun. 03, 2020 USD ($)	Feb. 28, 2020 $ / shares shares	Jun. 30, 2020 USD ($) shares	Jun. 30, 2020 USD ($) shares	Jun. 30, 2020 USD ($) shares	Jun. 05, 2020 $ / shares shares	Mar. 31, 2020 USD ($)	Oct. 01, 2019 USD ($)	Sep. 30, 2019 USD ($) shares	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capital stock authorized (in shares) | shares		2,100,000,000
Preferred stock authorized (in shares) | shares		100,000,000
Preferred stock par value (in dollars per share) | $ / shares		$ 1.00
Stock split, conversion ratio		477,242.614671815
Preferred stock outstanding (in shares) | shares			0	0	0	0
Decrease to accumulated deficit			$ (21)	$ (21)	$ (21)		$ (285)		$ (269)	$ (133)	$ (120)	$ (320)
Non-cash stock-based compensation expense				437	437
Modification of stock-based compensation plan				769	769
Lease liabilities			346	346	346
Operating lease right-of-use assets			278	278	278
Deferred rent liability									69
Decrease to accumulated deficit			(1,685)	(1,685)	(1,685)				(1,177)
Share-based Payment Arrangement
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stock-based compensation expense			3
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to accumulated deficit			(1,685)	(1,685)	(1,685)		(1,166)		(1,177)	(1,061)	(1,043)	(1,272)
Additional Paid-in Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to accumulated deficit			1,899	1,899	1,899		1,127		1,127	$ 1,127	$ 1,127	1,127
Modification of stock-based compensation plan	$ 769			769	769
Additional Paid-in Capital | IPO Tag-Along Right
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Modification of stock-based compensation plan	$ 57
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to accumulated deficit							0					150
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to accumulated deficit							$ 0					$ 139
ASC 718
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to share-based compensation liability				38
ASC 718 | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to accumulated deficit									33
ASC 718 | Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to accumulated deficit			$ 33	$ 33	$ 33				33
ASC 842
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liabilities								$ 366
Operating lease right-of-use assets								297
Decrease to accumulated deficit								$ 7
ASC 842 | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to accumulated deficit									7
ASC 842 | Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to accumulated deficit									$ 7
Class A Common Stock
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Common stock authorized (in shares) | shares		1,000,000,000	1,000,000,000	1,000,000,000	1,000,000,000				1,000,000,000
Common stock outstanding (in shares) | shares			77,000,000	77,000,000	77,000,000	77,000,000			0
Class A Common Stock | Omnibus Incentive Plan [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Common stock available for issuance (in shares) | shares			31,169,099	31,169,099	31,169,099
Incentive plan period					10 years
Shares issued in period (in shares) | shares					0
Class A Common Stock | IPO
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Price per share (in dollars per share) | $ / shares						$ 25
Class A Common Stock | IPO | Omnibus Incentive Plan [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Common stock available for issuance (in shares) | shares			1,000,000	1,000,000	1,000,000
Class B Common Stock
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Common stock authorized (in shares) | shares		1,000,000,000	1,000,000,000	1,000,000,000	1,000,000,000				1,000,000,000
Common stock outstanding (in shares) | shares		510,000,000	433,000,000	433,000,000	433,000,000	433,000,000			505,830,022

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187143-122770

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- Definition

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+ References

No definition available.

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- Definition

Capital Stock, Authorized

+ References

No definition available.

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- Definition

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+ References

No definition available.

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