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Consolidated Balance Sheets (Unaudited) - SPPC (Parenthetical) - $ / shares
Sep. 30, 2022
Dec. 31, 2021
Common stock, shares authorized 115,000,000 115,000,000
Common stock, shares issued 76,000,000 76,000,000
Common stock, shares outstanding 76,000,000 76,000,000
SPPC    
Common stock, par value (in dollars per share) $ 3.75 $ 3.75
Common stock, shares authorized 20,000,000 20,000,000
Common stock, shares issued 1,000 1,000
Common stock, shares outstanding 1,000 1,000