XML 68 R57.htm IDEA: XBRL DOCUMENT v3.21.2
Derivative Financial Instruments - Summary of Amounts Recorded in Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Sep. 30, 2020
Other current assets    
Derivatives, Fair Value [Line Items]    
Other assets $ 0 $ 0
Other current liabilities    
Derivatives, Fair Value [Line Items]    
Other liabilities 0 0
Other noncurrent assets    
Derivatives, Fair Value [Line Items]    
Other assets 0 0
Other noncurrent liabilities    
Derivatives, Fair Value [Line Items]    
Other liabilities $ (26) $ (38)