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Variable Interest Entities (JIGPC Joint Venture) (Details) - USD ($)
$ in Billions
3 Months Ended
Dec. 31, 2021
Mar. 31, 2026
Sep. 30, 2025
Jazan Integrated Gasification and Power Company ("JIGPC")      
Schedule of Equity Method Investments [Line Items]      
Ownership interest percentage   55.00%  
Ownership percentage attributable to noncontrolling partner (in percent)   4.00%  
Investment balance   $ 3.0 $ 3.1
Jazan Integrated Gasification and Power Company ("JIGPC") | Aramco      
Schedule of Equity Method Investments [Line Items]      
Term of project agreement (in years) 25 years