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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Accounts receivable, allowance | $ 88 | $ 64
Common stock, par value (in dollars per share) | $ 0.10 | $ 0.10

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