Condensed Consolidated Balance Sheets - Piedmont (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Allowance for doubtful accounts - receivables	$ 49	$ 40
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, shares outstanding (in shares)	771,000,000	770,000,000
Piedmont
Allowance for doubtful accounts - receivables	$ 10	$ 14
Common stock, shares authorized (in shares)	100	100
Common stock, shares outstanding (in shares)	100	100