Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Receivables-
Allowance for uncollectible accounts	$ 136	$ 159
Common stockholders’ equity-
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	700,000,000	700,000,000
Common stock, shares outstanding (in shares)	571,753,195	570,261,104
Other
Receivables-
Allowance for uncollectible accounts	$ 10	$ 10