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SHARE-BASED AND OTHER COMPENSATION, Employee Other Compensation (Details) - USD ($)
shares in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Award requisite service period 5 years    
Employer match of first $1,000 of compensation deferred by each participant (in hundredths) 75.00%    
Employer match of first $1,000 of compensation deferred by each participant (in dollars) $ 1,000    
Employer match of next $1,000 of compensation deferred by each participant (in hundredths) 25.00%    
Employer match of next $1,000 of compensation deferred by each participant (in dollars) $ 1,000    
Compensation expense $ 149,000,000 $ 162,000,000 $ 154,000,000
Employee Stock Ownership Plan ESOP      
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Number of shares of common stock held by ESOP (in shares) 4.7 4.6  
Market value of common stock held by the ESOP $ 341,000,000    
Value of unearned (not yet vested) shares held by ESOP plan participants $ 5,000,000