XML 187 R104.htm IDEA: XBRL DOCUMENT v3.24.3
Fair Value Measurements - Long-term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Carrying amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Estimated fair value $ 6,733 $ 6,647
Estimated fair value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Estimated fair value $ 6,663 $ 6,238