Stockholders' Equity - Schedule of As-Converted Class B Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |
9 Months Ended | |
|---|---|---|
Jun. 30, 2023 |
Jun. 30, 2022 |
|
| Stockholders' Equity Note [Abstract] | ||
| Reduction in equivalent number of as-converted shares of class A common stock (in shares) | 4 | 4 |
| Effective price per share (in dollars per share) | $ 219.70 | $ 205.06 |
| Deposits into the U.S. litigation escrow account | $ 850 | $ 850 |