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SEC Schedule, Article 12-09, Valuation and Qualifying Accounts
 12 Months Ended
Sep. 30, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
Year Ended
September 30,
(in millions)202020192018
Accounts Receivable - Allowance for Doubtful Accounts
Balance at beginning of period$14 $15 $20 
Provision charged to costs and expenses15 15 12 
Reserve adjustments(19)(16)(17)
Balance at end of period$10 $14 $15 
Deferred Tax Assets - Valuation Allowance
Balance at beginning of period$1,304 $846 $223 
Allowance provision for operating and other loss carryforwards
346 488 669 
Allowance provision (benefit) adjustments
6 (30)(46)
Balance at end of period$1,656 $1,304 $846