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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Current Assets: |  |
Allowance for uncollectible accounts | $ 18 | $ 17
Allowance for obsolescence | 120 | 123
Noncurrent Assets: |  |
Accumulated depreciation and amortization | 23,228 | 21,707
Accumulated amortization | $ 919 | $ 911
Stockholders' Equity: |  |
Common stock, par value (USD per share) | $ 0.0001 | $ 0.0001
Common stock, authorized (shares) | 1,500,000,000 | 1,500,000,000
Common stock, issued (shares) | 654,571,606 | 654,671,194
Treasury stock, at cost (shares) | 8,098,971 | 11,224,246

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