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Equity and Noncontrolling Interests - Schedule of Changes in Redeemable Noncontrolling Interest (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |
Beginning balance | $ 297 |
Dividends | (18) | $ (10)
Ending balance | 294 |
Redeemable Noncontrolling Interest |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |
Beginning balance | 95 | 91
Net income | 9 | 10
Dividends | (39) | (31)
Foreign currency translation adjustments | 3 | (8)
Ending balance | $ 68 | $ 62

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