Consolidated Balance Sheets (Unaudited) -SPPC (Parenthetical) - $ / shares	Sep. 30, 2021	Dec. 31, 2020
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares issued	2,000,000	4,000,000
Preferred stock, shares outstanding	2,000,000	4,000,000
Common stock, shares authorized	115,000,000	115,000,000
Common stock, no par value (in dollars per share)	$ 0	$ 0
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