Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Receivables-
Allowance for uncollectible accounts	$ 64	$ 137
Common stockholders' equity-
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, authorized (in shares)	700,000,000	700,000,000
Common stock, outstanding (in shares)	574,335,396	572,130,932
Other Receivables
Receivables-
Allowance for uncollectible accounts	$ 15	$ 11