Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Stockholders’ equity-
Common stock, par value (in dollars per share)	$ 0.1	$ 0.1
Common stock, shares authorized	700,000,000	700,000,000
Common stock, shares outstanding	532,092,829	511,915,450
Par Value, in dollars per share	$ 100	$ 100
Preferred stock, shares authorized	5,000,000	5,000,000
Customer
Receivables-
Allowance for uncollectible accounts	$ 46	$ 50
Other
Receivables-
Allowance for uncollectible accounts	3	2
Affiliated Companies
Receivables-
Allowance for uncollectible accounts	$ 937	$ 920
Series A Convertible Preferred Stock
Stockholders’ equity-
Common stock, shares outstanding	200,000	700,000
Preferred stock shares issued	1,616,000	1,616,000
Preferred stock shares outstanding	209,822	704,589