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)	$ 4,207	107			107
Balance (shares) at Sep. 30, 2021			1,000
Balance at Sep. 30, 2021		1,518	$ 0	1,111	408	(1)
Balance (shares) at Jun. 30, 2021			1,000
Balance at Jun. 30, 2021		1,456	$ 0	1,111	346	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 1,922	62			62
Balance (shares) at Sep. 30, 2021			1,000
Balance at Sep. 30, 2021		$ 1,518	$ 0	1,111	408	(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)	$ 1,926	100			100
Dividends declared		(70)			(70)
Contributions		$ 340		340
Balance (shares) at Sep. 30, 2022	76,000,000	1,000	1,000
Balance at Sep. 30, 2022	$ 45,858	$ 1,905	$ 0	1,451	455	(1)
Balance (shares) at Jun. 30, 2022			1,000
Balance at Jun. 30, 2022		1,846		1,451	396	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (842)	$ 59			59
Balance (shares) at Sep. 30, 2022	76,000,000	1,000	1,000
Balance at Sep. 30, 2022	$ 45,858	$ 1,905	$ 0	$ 1,451	$ 455	$ (1)