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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Stockholders’ equity-
Common stock, par value (in dollars per share)	$ 0.1	$ 0.1
Common stock, shares authorized (in shares)	700,000,000	700,000,000
Common stock, shares outstanding (in shares)	541,753,695	540,652,222
Other
Receivables-
Allowance for uncollectible accounts	$ 26	$ 21
Affiliated Companies
Receivables-
Allowance for uncollectible accounts		$ 1,063

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