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Stockholders' Equity - Schedule of Effect of VE Territory Covered Losses Recovery on the Company Repurchasing its Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Conversion of Stock [Line Items] |  |
Reduction in equivalent number of class A common stock (in shares) | 1 | 0
Effective price per share (in dollars per share) | $ 354.46 | $ 0
Deposits into the U.S. litigation escrow account | $ 500 | $ 0
Recovery through conversion rate adjustments | $ (1) | $ 0
Series B preferred stock |  |
Conversion of Stock [Line Items] |  |
Reduction in equivalent number of class A common stock (in shares) | 0 | 0
Effective price per share (in dollars per share) | $ 330.96 | $ 312.39
Recovery through conversion rate adjustments | $ 60 | $ 5
Series C preferred stock |  |
Conversion of Stock [Line Items] |  |
Reduction in equivalent number of class A common stock (in shares) | 0 | 0
Effective price per share (in dollars per share) | $ 330.96 | $ 312.39
Recovery through conversion rate adjustments | $ 49 | $ 3

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