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10-Q Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2023
May 31, 2023
May 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]          
Common stock, shares authorized (in shares) 300,000,000     80,000 80,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01   $ 10 $ 10
Common stock, shares issued (in shares) 56,997,350 56,997,350   80,000 80,000
Common stock, shares outstanding (in shares) 56,566,214     80,000 80,000
MDU Resources common stock held by subsidiary at cost (in shares)     538,921 538,921  
Treasury stock held at cost (in shares) 431,136