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Stock-Based Compensation Plans - Additional Information (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 05, 2020 USD ($) | Oct. 31, 2021 shares | Mar. 31, 2021 shares | Dec. 31, 2020 shares | Dec. 31, 2019 shares | Dec. 31, 2018 USD ($) shares | Sep. 30, 2022 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2017 employee shares
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
Modification of stock-based compensation plan | $ |  |  |  |  |  |  |  |  | $ 769 |
Weighted-average grant date intrinsic value of share awards (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 23.82 |
Unrecognized compensation costs | $ |  |  |  |  |  |  | $ 1 | $ 4 | $ 14 |
Total compensation of unvested awards expected to be recognized, weighted average period |  |  |  |  |  |  | 1 year |  |  |
Non-cash compensation expense | $ |  |  |  |  |  |  | $ 39 | $ 45 | $ 608 |
IPO |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Modification of stock-based compensation plan | $ | $ 769 |  |  |  |  |  |  |  |  |
Proceeds from issuance initial public offering | $ | $ 57 |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of deferred equity units (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 38.50 | $ 32.29 |  |
Unrecognized compensation costs | $ |  |  |  |  |  |  | $ 31 |  |  |
Total compensation of unvested awards expected to be recognized, weighted average period |  |  |  |  |  |  | 2 years 8 months 12 days |  |  |
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 44.38 | $ 32.23 |  |
Awards vested in period, fair value | $ |  |  |  |  |  |  | $ 18 | $ 0 |  |
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) |  |  |  |  |  |  |  |  |  | 39,255,429.54
Deferred equity unit share (in 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) |  |  |  |  |  |  |  |  |  | 3,896,654
Common Class A |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued under Omnibus Incentive Plan (in shares) |  |  |  |  |  |  | 463,826 | 36,206 | 28,361 |
Shares issued in period (in shares) |  |  |  | 4,321,259 |  |  |  |  |  |
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) |  |  |  |  |  |  | 31,169,099 |  |  |
Share awards vesting period |  |  |  |  |  |  | 10 years |  |  |
Shares held in employee stock option plan, allocated (in shares) |  |  |  |  |  |  | 528,393 |  |  |
Common stock available for issuance (in shares) |  |  |  |  |  |  | 30,640,706 |  |  |
Common Class A | Omnibus Incentive Plan | IPO |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  | 1,000,000 |  |  |
Common Class B |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Exchange of Class B shares for Class A shares (in shares) |  | 510,165 | 968,920 | 18,265,183 |  |  |  |  |  |
Deferred Equity Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted-average grant date intrinsic value of share awards (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0 | $ 0 |  |
Fair value of deferred equity units (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 27.01 |
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] |  |  |  |  |  |  |  |  |  |
Cash paid to settle awards | $ |  |  |  |  |  | $ 2 |  |  |  |
Awards settled (in shares) |  |  |  |  |  | 8,359,629.35 |  |  |  |
Matching Equity Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Cash paid to settle awards | $ |  |  |  |  |  | $ 1 |  |  |  |
Weighted-average grant date intrinsic value of share awards (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0 | $ 0 |  |
Matching Equity Units | Common Class A |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Cash paid to settle awards | $ |  |  |  |  |  | $ 58 |  |  |  |
Awards settled (in shares) |  |  |  |  |  | 217,312.53 |  |  |  |
Common Stock | Common Class A |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued under Omnibus Incentive Plan (in shares) |  |  |  |  |  |  | 187,261 | 36,206 | 28,361 |
Vesting of restricted stock units, net of shares withheld for employee taxes (in shares) |  |  |  |  |  |  | 276,565 |  |  |
Exchange of Class B shares for Class A shares (in shares) |  |  |  |  |  |  | 14,320,547 | 19,234,103 |  |
Common Stock | Common Class B |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Exchange of Class B shares for Class A shares (in shares) |  |  |  |  |  |  | 14,320,547 | 19,234,106 |  |

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