Consolidated Statements of Financial Position (Parenthetical) $ in Millions |
Mar. 31, 2026
USD ($)
$ / shares
|
Mar. 31, 2026
€ / shares
|
Sep. 30, 2025
USD ($)
$ / shares
|
Sep. 30, 2025
€ / shares
|
|---|---|---|---|---|
| Accounts receivable, allowance for credit loss, current | $ | $ 172 | $ 205 | ||
| Ordinary shares, par value (in dollars per share) | $ 0.01 | $ 0.01 | ||
| Preferred shares, par value (in dollars per share) | $ 0.01 | $ 0.01 | ||
| Common Class A | ||||
| Ordinary shares, par value (in dollars per share) | € / shares | € 1.00 | € 1.00 |