Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions		Total	Total Stockholders' Equity	Preferred Stock	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income	Noncontrolling Interest in Subsidiary
Beginning balance at Dec. 31, 2023		$ 5,322	$ 5,307	$ 2,476	$ 5	$ (4,662)	$ 10,095	$ (2,613)	$ 6	$ 15
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock repurchases		(285)	(285)			(285)
Effects of stock-based incentive compensation plans	[1]	35	35				35
Equity issued in subsidiary to acquire Energy Harbor	[2]	2,307	747				747			1,560
Net income (loss)		18	(35)					(35)		53
Dividends declared on common stock		(77)	(77)					(77)
Dividends declared on preferred stock		(37)	(37)					(37)
Other		(1)	(1)				1
Ending balance at Mar. 31, 2024		7,284	5,656	2,476	5	(4,947)	10,878	(2,762)	6	1,628
Beginning balance at Dec. 31, 2023		5,322	5,307	2,476	5	(4,662)	10,095	(2,613)	6	15
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		2,322
Ending balance at Sep. 30, 2024		5,455	5,441	2,476	5	(5,684)	9,396	(759)	7	14
Beginning balance at Mar. 31, 2024		7,284	5,656	2,476	5	(4,947)	10,878	(2,762)	6	1,628
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock repurchases		(331)	(331)			(331)
Effects of stock-based incentive compensation plans		40	40				40
Net income (loss)		467	365					365		102
Dividends declared on common stock		(77)	(77)					(77)
Dividends declared on preferred stock		(59)	(59)					(59)
Dividends to noncontrolling interest		(15)								(15)
Other		(2)	(1)				(1)			1
Ending balance at Jun. 30, 2024		7,307	5,593	2,476	5	(5,278)	10,917	(2,533)	6	1,714
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock repurchases		(406)	(406)			(406)
Effects of stock-based incentive compensation plans		28	28				28
Net income (loss)		1,837	1,888					1,888		(51)
Dividends declared on common stock		(76)	(76)					(76)
Dividends declared on preferred stock		(39)	(39)					(39)
Change in accumulated other comprehensive income		1	1						1
Modification of noncontrolling interest to redeemable noncontrolling interest	[2]	3,198	1,539				1,539			1,659
Other		1	(9)				(10)	1		(10)
Ending balance at Sep. 30, 2024		5,455	5,441	2,476	5	(5,684)	9,396	(759)	7	14
Beginning balance at Dec. 31, 2024		5,583	5,570	2,476	5	(5,912)	9,435	(454)	20	13
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock repurchases		(336)	(336)			(336)
Effects of stock-based incentive compensation plans	[1]	(27)	(27)				(27)
Net income (loss)		(268)	(268)					(268)
Dividends declared on common stock		(75)	(75)					(75)
Dividends declared on preferred stock		(38)	(38)					(38)
Other		(1)	(1)				(1)
Ending balance at Mar. 31, 2025		4,838	4,825	2,476	5	(6,248)	9,407	(835)	20	13
Beginning balance at Dec. 31, 2024		5,583	5,570	2,476	5	(5,912)	9,435	(454)	20	13
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		711
Ending balance at Sep. 30, 2025		5,223	5,210	2,476	5	(6,675)	9,491	(107)	20	13
Beginning balance at Mar. 31, 2025		4,838	4,825	2,476	5	(6,248)	9,407	(835)	20	13
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock repurchases		(237)	(237)			(237)
Effects of stock-based incentive compensation plans		43	43				43
Net income (loss)		327	327					327		0
Dividends declared on common stock		(77)	(77)					(77)
Dividends declared on preferred stock		(58)	(58)					(58)
Change in accumulated other comprehensive income		(1)	(1)						(1)
Other		1	1					1
Ending balance at Jun. 30, 2025		4,836	4,823	2,476	5	(6,485)	9,450	(642)	19	13
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock repurchases		(190)	(190)			(190)
Effects of stock-based incentive compensation plans		42	42				42
Net income (loss)		652	652					652		0
Dividends declared on common stock		(79)	(79)
Dividends declared on preferred stock		(39)	(39)					(39)
Change in accumulated other comprehensive income		1	1						1
Other		0					(1)	1
Ending balance at Sep. 30, 2025		$ 5,223	$ 5,210	$ 2,476	$ 5	$ (6,675)	$ 9,491	$ (107)	$ 20	$ 13

[1] Includes cash payments to cover tax withholding obligations upon the vesting of stock-based incentive compensation plans of $50 million and $12 million for the three months ended March 31, 2025 and 2024, respectively.

[2] See Note 2 for additional information regarding activity associated with noncontrolling interest.