CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY, UTILITY - USD ($) $ in Millions	Total	Utility	Total Shareholders' Equity	Total Shareholders' Equity Utility	Preferred Stock	Preferred Stock Utility	Common Stock	Common Stock Utility	Additional Paid-in Capital Utility	Reinvested Earnings	Reinvested Earnings Utility	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Utility
Beginning balance at Dec. 31, 2023	$ 25,292		$ 25,040	$ 29,524		$ 258	$ 30,374	$ 1,322	$ 30,570	$ (5,321)	$ (2,613)	$ (13)	$ (13)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	735		735	781						735	781
Other comprehensive income (loss)	(1)		(1)	(1)								(1)	(1)
Equity contribution				440					440
Common stock dividend	(22)		(22)	(450)						(22)	(450)
Preferred stock dividend requirement				(3)							(3)
Ending balance at Mar. 31, 2024	25,983		25,731	30,291		258	30,356	1,322	31,010	(4,611)	(2,285)	(14)	(14)
Beginning balance at Dec. 31, 2023	25,292		25,040	29,524		258	30,374	1,322	30,570	(5,321)	(2,613)	(13)	(13)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,838	$ 1,964
Other comprehensive income (loss)	3	5
Ending balance at Sep. 30, 2024	27,086		26,834	31,740		258	30,402	1,322	32,278	(3,558)	(2,109)	(10)	(9)
Beginning balance at Mar. 31, 2024	25,983		25,731	30,291		258	30,356	1,322	31,010	(4,611)	(2,285)	(14)	(14)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	524		524	565						524	565
Equity contribution				265					265
Common stock dividend	(21)		(21)	(500)						(21)	(500)
Preferred stock dividend requirement				(4)							(4)
Ending balance at Jun. 30, 2024	26,505		26,253	30,617		258	30,379	1,322	31,275	(4,112)	(2,224)	(14)	(14)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	579	618	579	618						579	618
Other comprehensive income (loss)	4	5	4	5								4	5
Equity contribution				1,003					1,003
Common stock dividend	(22)		(22)	(500)						(22)	(500)
Preferred stock dividend requirement				(3)							(3)
Ending balance at Sep. 30, 2024	27,086		26,834	31,740		258	30,402	1,322	32,278	(3,558)	(2,109)	(10)	(9)
Beginning balance at Dec. 31, 2024	30,401		30,149	35,550	$ 1,579	258	31,555	1,322	35,930	(2,966)	(1,940)	(19)	(20)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	634		634	695						634	695
Other comprehensive income (loss)	7		7	7								7	7
Equity contribution				450					450
Common stock dividend	(55)		(55)	(575)						(55)	(575)
Preferred stock dividend requirement				(3)							(3)
Ending balance at Mar. 31, 2025	30,937		30,685	36,124	1,579	258	31,532	1,322	36,380	(2,414)	(1,823)	(12)	(13)
Beginning balance at Dec. 31, 2024	30,401		30,149	35,550	1,579	258	31,555	1,322	35,930	(2,966)	(1,940)	(19)	(20)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,033	2,220
Other comprehensive income (loss)	11	12
Ending balance at Sep. 30, 2025	32,230		31,978	37,342	1,579	258	31,588	1,322	37,226	(1,181)	(1,455)	(8)	(9)
Beginning balance at Mar. 31, 2025	30,937		30,685	36,124	1,579	258	31,532	1,322	36,380	(2,414)	(1,823)	(12)	(13)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	549	612	549							549	612
Other comprehensive income (loss)	8		8	8								8	8
Equity contribution				325					325
Common stock dividend	(56)		(56)	(575)						(56)	(575)
Preferred stock dividend requirement				(4)							(4)
Ending balance at Jun. 30, 2025	31,438		31,186	36,490	1,579	258	31,560	1,322	36,705	(1,949)	(1,790)	(4)	(5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	850	913	850	913						850	913
Other comprehensive income (loss)	(4)	$ (4)	(4)	(4)								(4)	(4)
Equity contribution				521					521
Common stock dividend	(55)		(55)	(575)						(55)	(575)
Preferred stock dividend requirement				(3)							(3)
Ending balance at Sep. 30, 2025	$ 32,230		$ 31,978	$ 37,342	$ 1,579	$ 258	$ 31,588	$ 1,322	$ 37,226	$ (1,181)	$ (1,455)	$ (8)	$ (9)