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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
CONDENSED CONSOLIDATED BALANCE SHEETS |  |
Allowance for doubtful accounts | $ 26 | $ 25
Allowance for other receivables | 7 | 8
Accumulated depreciation and amortization | $ 21,438 | $ 20,537
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 1,500,000,000 | 1,500,000,000
Common stock, shares issued | 630,282,461 | 630,282,461
Treasury stock, shares | 219,742,939 | 214,158,636

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