Schedule I - Condensed Financial Information of Registrant (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows — operating activities:
Cash provided by operating activities	$ 4,563	$ 5,453	$ 485
Cash flows — investing activities:
Proceeds from sales of subsidiary transferable ITCs	150	0	0
Cash used in investing activities	(5,276)	(2,145)	(1,239)
Cash flows — financing activities:
Stock repurchases	(1,266)	(1,245)	(1,949)
Dividends paid to common stockholders	(305)	(313)	(302)
Dividends paid to preferred stockholders	(173)	(150)	(151)
TRA Repurchase and tender offer — return of capital	(122)	0	0
Other, net	(14)	83	31
Cash used in financing activities	(1,604)	(294)	(80)
Cash, cash equivalents and restricted cash — beginning balance	3,539	525	1,359
Cash, cash equivalents and restricted cash — ending balance	1,222	3,539	525
Parent
Cash flows — operating activities:
Cash provided by operating activities	(37)	(31)	(27)
Cash flows — investing activities:
Dividend received from subsidiaries	1,705	1,625	1,775
Proceeds from sales of subsidiary transferable ITCs	150	0	0
Cash used in investing activities	1,855	1,625	1,775
Cash flows — financing activities:
Stock repurchases	(1,266)	(1,245)	(1,949)
Dividends paid to common stockholders	(305)	(313)	(302)
Dividends paid to preferred stockholders	(173)	(150)	(151)
TRA Repurchase and tender offer — return of capital	(122)	0	0
Other, net	39	91	40
Cash used in financing activities	(1,827)	(1,617)	(2,362)
Net change in cash, cash equivalents and restricted cash	(9)	(23)	(614)
Cash, cash equivalents and restricted cash — beginning balance	31	54	668
Cash, cash equivalents and restricted cash — ending balance	$ 22	$ 31	$ 54