Consolidated Statements of Changes in Equity - SPPC - USD ($) $ in Millions	Total	Additional Paid-in Capital	SPPC	SPPC Common Stock	SPPC Additional Paid-in Capital	SPPC Retained Earnings	SPPC Accumulated Other Comprehensive Income (Loss)
Balance (shares) at Dec. 31, 2018				1,000
Balance at Dec. 31, 2018			$ 1,264	$ 0	$ 1,111	$ 153	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to parent	$ 2,950		103			103
Dividends declared			(46)			(46)
Other equity transactions	3		(1)				(1)
Balance (shares) at Dec. 31, 2019				1,000
Balance at Dec. 31, 2019			1,320	$ 0	1,111	210	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to parent	6,943		111			111
Dividends declared			$ (20)			(20)
Other equity transactions	$ 0	$ (1)
Balance (shares) at Dec. 31, 2020	76,000,000		1,000	1,000
Balance at Dec. 31, 2020	$ 43,010		$ 1,411	$ 0	1,111	301	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to parent	5,790		$ 124			124
Other equity transactions	$ (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)