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)	$ 1,926	100			100
Dividends declared		(70)			(70)
Contributions		340		340
Balance (shares) at Sep. 30, 2022			1,000
Balance at Sep. 30, 2022		1,905	$ 0	1,451	455	(1)
Balance (shares) at Jun. 30, 2022			1,000
Balance at Jun. 30, 2022		1,846	$ 0	1,451	396	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (842)	59			59
Balance (shares) at Sep. 30, 2022			1,000
Balance at Sep. 30, 2022		$ 1,905	$ 0	1,451	455	(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)	$ 2,558	111			111
Dividends declared		$ (100)			(100)
Balance (shares) at Sep. 30, 2023	76,000,000	1,000	1,000
Balance at Sep. 30, 2023	$ 48,643	$ 2,059	$ 0	1,576	484	(1)
Balance (shares) at Jun. 30, 2023			1,000
Balance at Jun. 30, 2023		2,095	$ 0	1,576	520	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 494	64			64
Dividends declared		$ (100)			(100)
Balance (shares) at Sep. 30, 2023	76,000,000	1,000	1,000
Balance at Sep. 30, 2023	$ 48,643	$ 2,059	$ 0	$ 1,576	$ 484	$ (1)