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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2023 | Sep. 30, 2022 | Mar. 31, 2022
--- | --- | --- | ---
Statement of Financial Position [Abstract] |  |  |
Allowance for doubtful accounts | $ 80 | $ 64 | $ 70
Accumulated depreciation | $ 4,427 | $ 4,166 | $ 4,117
Preferred Stock, shares authorized (in shares) | 5,000,000 | 5,000,000 | 5,000,000
Preferred Stock, shares issued (in shares) | 220,000 | 220,000 | 220,000
Common Stock, shares authorized (in shares) | 450,000,000 | 450,000,000 | 450,000,000
Common Stock, shares issued (in shares) | 210,730,077 | 210,560,494 | 210,127,957

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