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Nonconsolidated Partially-Owned Affiliates - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Sep. 30, 2025
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Equity Method Investments and Joint Ventures [Abstract] |  |
Total investments in partially-owned affiliates | $ 312 | $ 276

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- Definition Amount of investment in equity method investee and investment in and advance to affiliate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(18)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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