Condensed Consolidated Balance Sheets - Piedmont (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Allowance for doubtful accounts - receivables	$ 44	$ 46
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, shares outstanding (in shares)	770,000,000	769,000,000
Piedmont
Allowance for doubtful accounts - receivables	$ 15	$ 15
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares outstanding (in shares)	100,000,000	100,000,000