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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Statement Of Financial Position [Abstract] |  |
Allowance for Accounts Receivable | $ 144 | $ 150
Accumulated Depreciation | $ 10,935 | $ 10,991
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) | 235,000,000 | 233,000,000

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