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Stock-Based Compensation Plans - Additional Information (Details) $ / shares in Units, $ in Millions			1 Months Ended		12 Months Ended
	Aug. 14, 2020 shares	Jun. 05, 2020 USD ($) $ / shares	Dec. 31, 2019 shares	Dec. 31, 2018 USD ($) shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) $ / shares	Sep. 30, 2017 shares	Dec. 31, 2017 Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share awards vesting period					2 years
Number of additional employees to participate in plan | Employee									2
Weighted-average grant date intrinsic value of share awards (in usd per share) | $ / shares					$ 23.82	$ 3.13	$ 3.12
Modification of stock-based compensation plan | $					$ 769
Non-cash compensation expense | $					608	$ 50	$ 62
Free cash flow compensation expense | $					16	15	19
Dividend expense related to equity units | $					1	7	27
Unrecognized compensation costs | $					$ 14	$ 16	$ 18
Total compensation of unvested awards expected to be recognized, weighted average period					1 year
IPO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock (in usd per share) | $ / shares					$ 25
Modification of stock-based compensation plan | $		$ 769
Proceeds from issuance initial public offering | $		$ 57
Omnibus Incentive Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	28,361
Shares held in employee stock option plan, allocated (in shares) | shares					28,361
Senior Management Free Cash Flow Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares) | shares								39,255,429.54
Deferred equity unit share (in shares) | shares			314,631.58	314,631.58				19,612,714.77
Senior Management Free Cash Flow Plan | LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares) | shares			4,169,978					23,640,925
Common Class A | IPO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock (in usd per share) | $ / shares		$ 25
Common Class A | Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares) | shares					31,169,099
Share awards vesting period					10 years
Deferred Equity Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares					0	0
Weighted-average grant date intrinsic value of share awards (in usd per share) | $ / shares					$ 0	$ 0
Fair value of deferred equity units (in usd per share) | $ / shares					$ 27.01	$ 7.71	$ 6.37
Deferred Equity Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share awards vesting period					1 year
Deferred Equity Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share awards vesting period					7 years
Fractional Shares | Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards settled (in shares) | shares				8,359,629.35
Cash paid to settle awards | $				$ 2
Matching Equity Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares					0	0
Cash paid to settle awards | $				$ 1
Weighted-average grant date intrinsic value of share awards (in usd per share) | $ / shares					$ 0	$ 0
Matching Equity Units | Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards settled (in shares) | shares				217,312.53
Cash paid to settle awards | $				$ 58

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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