Summary of Significant Accounting Policies - EPS (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Basic earnings per share:
Net income (loss)	$ 1,436	$ (11)
Less: Preference stock dividend requirements of SCE	(1)	0
Net income (loss) available to common shareholders	$ 1,435	$ (11)
Weighted average common shares outstanding (in shares)	385,000,000	385,000,000
Basic earnings per share (in dollars per share)	$ 3.73	$ (0.03)
Diluted earnings per share:
Net income (loss) available to common shareholders	$ 1,435	$ (11)
Income impact of assumed conversions	$ 1	$ 0
Weighted average common shares outstanding (in shares)	385,000,000	385,000,000
Incremental shares from assumed conversions (in shares)	1,000,000	0
Adjusted weighted average shares - diluted (in shares)	386,000,000	385,000,000
Diluted earnings per share (in dollars per share)	$ 3.72	$ (0.03)
Antidilutive awards excluded from earnings per share (in shares)	8,203,681	4,202,791