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)	$ (129)	28			28
Contributions		130		130
Balance (shares) at Mar. 31, 2022			1,000
Balance at Mar. 31, 2022		$ 1,693	$ 0	1,241	453	(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)	$ 989	$ 27			27
Balance (shares) at Mar. 31, 2023	76,000,000	1,000	1,000
Balance at Mar. 31, 2023	$ 47,853	$ 2,075	$ 0	$ 1,576	$ 500	$ (1)