Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Receivables-
Allowance for uncollectible accounts	$ 85	$ 137
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)	573,814,823	572,130,932
Other
Receivables-
Allowance for uncollectible accounts	$ 15	$ 11