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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Stockholders’ equity- |  |
Common stock, par value (in dollars per share) | $ 0.1 | $ 0.1
Common stock, authorized (in shares) | 700,000,000 | 700,000,000
Common stock, outstanding (in shares) | 540,652,222 | 511,915,450
Preferred stock, par value (in dollars per share) | $ 100 | $ 100
Preferred stock, authorized (in shares) | 5,000,000 | 5,000,000
Preferred shares, outstanding (in shares) | 0 |
Customer |  |
Receivables- |  |
Allowance for uncollectible accounts (in dollars) | $ 46 | $ 50
Other |  |
Receivables- |  |
Allowance for uncollectible accounts (in dollars) | $ 21 | $ 2
Series A Convertible Preferred Stock |  |
Stockholders’ equity- |  |
Common stock, outstanding (in shares) | 0 | 700,000
Preferred stock, authorized (in shares) | 1,616,000 | 1,616,000
Preferred shares, outstanding (in shares) | 0 | 704,589
Affiliated companies |  |
Receivables- |  |
Allowance for uncollectible accounts (in dollars) | $ 1,063 | $ 920

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