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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
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Dec. 31, 2021 | Dec. 31, 2020
Conversion of Stock [Line Items] |  |
Recovery through conversion rate adjustment | $ 0 | $ 0
Series B 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) | $ 201.68 | $ 209.89
Recovery through conversion rate adjustment | $ 26 | $ 9
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) | $ 201.68 | $ 209.89
Recovery through conversion rate adjustment | $ 3 | $ 6

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