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v3.26.1

U.S. and Europe Retrospective Responsibility Plans - Schedule of Changes in Preferred Stock and Right to Recover for Covered Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance as of beginning of period | $ 38,777 |  | $ 38,296 |  | $ 37,909 |  | $ 39,137 |
VE territory covered losses | (25) |  | 3 |  | (28) |  | (24) |
Recovery through conversion rate adjustments |  |  |  |  | (1) |  | 0 |
Balance as of end of period | 35,661 |  | 38,030 |  | 35,661 |  | 38,030 |
Preferred Stock |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance as of beginning of period | 551 |  | 904 |  | 745 | [1] | 1,031 | [2]
Recovery through conversion rate adjustments |  |  |  |  | (109) |  | (8) |
Balance as of end of period | 528 | [1] | 880 | [2] | 528 | [1] | 880 | [2]
Right to Recover for Covered Losses |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance as of beginning of period | (19) |  | (123) |  | (124) |  | (104) |
VE territory covered losses | (25) |  | 3 |  | (28) |  | (24) |
Recovery through conversion rate adjustments |  |  |  |  | 108 |  | 8 |
Balance as of end of period | (44) |  | (120) |  | (44) |  | (120) |
Series B preferred stock |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Recovery through conversion rate adjustments |  |  |  |  | 60 |  | 5 |
Series B preferred stock | Preferred Stock |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance as of beginning of period |  |  |  |  | 67 |  | 104 |
VE territory covered losses |  |  |  |  | 0 |  | 0 |
Recovery through conversion rate adjustments |  |  |  |  | (60) |  | (5) |
Balance as of end of period | 7 |  | 99 |  | 7 |  | 99 |
Series C preferred stock |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Recovery through conversion rate adjustments |  |  |  |  | 49 |  | 3 |
Series C preferred stock | Preferred Stock |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance as of beginning of period |  |  |  |  | 165 |  | 387 |
VE territory covered losses |  |  |  |  | 0 |  | 0 |
Recovery through conversion rate adjustments |  |  |  |  | (49) |  | (3) |
Balance as of end of period | $ 116 |  | $ 384 |  | $ 116 |  | $ 384 |
[1] | As of March 31, 2026 and September 30, 2025, the book value of series A convertible participating preferred stock (series A preferred stock) was $405 million and $513 million, respectively. See Note 5—U.S. and Europe Retrospective Responsibility Plans for the book value of series B convertible participating preferred stock (series B preferred stock) and series C convertible participating preferred stock (series C preferred stock).
[2] | As of March 31, 2025 and September 30, 2024, the book value of series A preferred stock was $397 million and $540 million, respectively. See Note 5—U.S. and Europe Retrospective Responsibility Plans for the book value of series B and series C preferred stock.

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