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, 2020			1,000
Balance at Dec. 31, 2020		$ 1,411	$ 0	$ 1,111	$ 301	$ (1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 2,285	45			45
Balance (shares) at Jun. 30, 2021			1,000
Balance at Jun. 30, 2021		1,456	$ 0	1,111	346	(1)
Balance (shares) at Mar. 31, 2021			1,000
Balance at Mar. 31, 2021		1,439	$ 0	1,111	329	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 2,281	17			17
Balance (shares) at Jun. 30, 2021			1,000
Balance at Jun. 30, 2021		$ 1,456	$ 0	1,111	346	(1)
Balance (shares) at Dec. 31, 2021	76,000,000	1,000	1,000
Balance at Dec. 31, 2021	$ 46,694	$ 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	76,000,000	1,000	1,000
Balance at Jun. 30, 2022	$ 47,304	$ 1,846	$ 0	1,451	396	(1)
Balance (shares) at Mar. 31, 2022			1,000
Balance at Mar. 31, 2022		1,693		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	76,000,000	1,000	1,000
Balance at Jun. 30, 2022	$ 47,304	$ 1,846	$ 0	$ 1,451	$ 396	$ (1)