Consolidated Statements of Changes in Equity (Unaudited) - SPPC - USD ($) $ in Millions	Total	SPPC	SPPC Common Stock	SPPC Additional Paid-in Capital	SPPC Retained Earnings	SPPC Accumulated Other Comprehensive (Loss) Income, Net
Balance (shares) at Dec. 31, 2021			1,000
Balance at Dec. 31, 2021		$ 1,535	$ 0	$ 1,111	$ 425	$ (1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 2,768	41			41
Dividends declared		(70)			(70)
Contributions		340		340
Balance (shares) at Jun. 30, 2022			1,000
Balance at Jun. 30, 2022		1,846	$ 0	1,451	396	(1)
Balance (shares) at Mar. 31, 2022			1,000
Balance at Mar. 31, 2022		1,693	$ 0	1,241	453	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 2,897	13			13
Dividends declared		(70)			(70)
Contributions		210		210
Balance (shares) at Jun. 30, 2022			1,000
Balance at Jun. 30, 2022		$ 1,846	$ 0	1,451	396	(1)
Balance (shares) at Dec. 31, 2022	76,000,000	1,000	1,000
Balance at Dec. 31, 2022	$ 46,832	$ 2,048	$ 0	1,576	473	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 2,064	$ 47			47
Balance (shares) at Jun. 30, 2023	76,000,000	1,000	1,000
Balance at Jun. 30, 2023	$ 49,183	$ 2,095	$ 0	1,576	520	(1)
Balance (shares) at Mar. 31, 2023			1,000
Balance at Mar. 31, 2023		2,075	$ 0	1,576	500	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 1,075	$ 20			20
Balance (shares) at Jun. 30, 2023	76,000,000	1,000	1,000
Balance at Jun. 30, 2023	$ 49,183	$ 2,095	$ 0	$ 1,576	$ 520	$ (1)