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SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Allowance for doubtful accounts |  |  |
Valuation and Qualifying Account |  |  |
Balance at beginning of year | $ 32 | $ 35 | $ 27
Charged (credited) to costs and expenses | 32 | 29 | 36
Other | (22) | (32) | (28)
Balance at end of year | 42 | 32 | 35
Deferred tax assets valuation allowance |  |  |
Valuation and Qualifying Account |  |  |
Balance at beginning of year | 91 | 117 | 107
Charged (credited) to costs and expenses | 0 | (26) | 10
Other | 14 | 0 | 0
Balance at end of year | $ 105 | $ 91 | $ 117

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