Stockholders' Equity - Effect of VE Territory Covered Losses Through Conversion Rate Adjustments (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2022 |
Jun. 30, 2021 |
Jun. 30, 2022 |
Jun. 30, 2021 |
|
| Conversion of Stock [Line Items] | ||||
| Recovery through conversion rate adjustment | $ 0 | $ (2) | $ 0 | $ (2) |
| Series B preferred stock | ||||
| Conversion of Stock [Line Items] | ||||
| Reduction in equivalent number of as-converted shares of class A common stock (in shares) | 1 | 0 | ||
| Effective price per share (in dollars per share) | $ 203.08 | $ 220.84 | ||
| Recovery through conversion rate adjustment | $ 135 | $ 35 | ||
| Series C preferred stock | ||||
| Conversion of Stock [Line Items] | ||||
| Reduction in equivalent number of as-converted shares of class A common stock (in shares) | 0 | 0 | ||
| Effective price per share (in dollars per share) | $ 202.55 | $ 220.71 | ||
| Recovery through conversion rate adjustment | $ 6 | $ 20 | ||