Consolidated Balance Sheets (Unaudited) - SPPC (Parenthetical) - $ / shares	Jun. 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