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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Allowance for Accounts Receivable | $ 113 | $ 123
Accumulated Depreciation | $ 11,233 | $ 11,130
Common Stock, par value (in dollars per share) | $ 0 | $ 0
Common Stock, shares authorized (in shares) | 450,000,000 | 450,000,000
Common Stock, shares outstanding (in shares) | 282,000,000 | 282,000,000

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