Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Noncumulative Convertible Preferred Stock Series B	Noncumulative Convertible Preferred Stock Series C	Series B Preferred Stock	Series C Preferred Stock	Preferred Stock A (Par Value: $0.01)	Common Stock (Par Value: $0.01)	Common Stock (Par Value: $0.01) Series B Preferred Stock	Common Stock (Par Value: $0.01) Series C Preferred Stock	Paid-in Capital in excess of Par	Paid-in Capital in excess of Par Series B Preferred Stock	Paid-in Capital in excess of Par Series C Preferred Stock	(Accumulated deficit)/Retained Earnings	Treasury Stock, at Cost	AOCL, Net of Tax
Beginning balance (in shares) at Dec. 31, 2023	240,688,790
Beginning balance at Dec. 31, 2023	$ 8,367					$ 503	$ 2			$ 8,236			$ 443	$ (218)	$ (599)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance and exercise of stock (in shares)	25,543,655			63,770,655	85,435,618
Issuance and exercise of stock	$ 103			$ 257	$ 341		1		$ 1	102	$ 257	$ 340
Issuance of warrants to purchase common shares	$ 302									302
Shares issued for restricted stock, net of forfeitures (in shares)	275,051
Shares issued for restricted stock, net of forfeitures	$ 0									(9)				9
Compensation expense related to restricted stock awards	38									38
Net loss	(930)												(930)
Dividends paid on common stock	(48)												(48)
Dividends paid on preferred stock	$ (27)												(27)
Purchase of common stock (in shares)	(455,802)
Purchase of common stock	$ (10)													(10)
Other comprehensive income (loss), net of tax	$ 178														178
Ending balance (in shares) at Sep. 30, 2024	415,257,967
Ending balance at Sep. 30, 2024	$ 8,571					503	4			9,266			(562)	(219)	(421)
Preferred Stock Mezzanine (Par Value: $0.01)
Issuance of mezzanine preferred stock		$ 258	$ 346
Issuance of common shares for the conversion of Series B/ C preferred, net				$ (257)	$ (346)
Ending balance at Sep. 30, 2024	$ 1
Preferred Stock Mezzanine (Par Value: $0.01)
Dividends paid on preferred stock (in usd per share)				$ 6.66
Beginning balance (in shares) at Jun. 30, 2024	351,304,364
Beginning balance at Jun. 30, 2024	$ 8,397					503	4			8,997			(270)	(223)	(614)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance and exercise of stock (in shares)				63,770,655
Issuance and exercise of stock	$ 257							$ 0			$ 257
Shares issued for restricted stock, net of forfeitures (in shares)	282,417
Shares issued for restricted stock, net of forfeitures	$ 0									(5)				5
Compensation expense related to restricted stock awards	17									17
Net loss	(280)												(280)
Dividends paid on common stock	(3)												(3)
Dividends paid on preferred stock	$ (9)												(9)
Purchase of common stock (in shares)	(99,469)
Purchase of common stock	$ (1)													(1)
Other comprehensive income (loss), net of tax	$ 193														193
Ending balance (in shares) at Sep. 30, 2024	415,257,967
Ending balance at Sep. 30, 2024	$ 8,571					503	4			9,266			(562)	(219)	(421)
Beginning balance at Jun. 30, 2024	258
Preferred Stock Mezzanine (Par Value: $0.01)
Issuance of common shares for the conversion of Series B/ C preferred, net				$ (257)
Ending balance at Sep. 30, 2024	$ 1
Preferred Stock Mezzanine (Par Value: $0.01)
Dividends paid on preferred stock (in usd per share)				$ 3.33
Beginning balance (in shares) at Dec. 31, 2024	414,934,628
Beginning balance at Dec. 31, 2024	$ 8,167					503	4			9,282			(763)	(219)	(640)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for restricted stock, net of forfeitures (in shares)	1,368,201
Shares issued for restricted stock, net of forfeitures	$ 0									(28)				28
Compensation expense related to restricted stock awards	46									46
Net loss	(206)												(206)
Dividends paid on common stock	(12)												(12)
Dividends paid on preferred stock	$ (25)												(25)
Purchase of common stock (in shares)	(694,684)
Purchase of common stock	$ (7)													(7)
Other comprehensive income (loss), net of tax	$ 145														145
Ending balance (in shares) at Sep. 30, 2025	415,608,145
Ending balance at Sep. 30, 2025	$ 8,108					503	4			9,300			(1,006)	(198)	(495)
Beginning balance at Dec. 31, 2024	1
Ending balance at Sep. 30, 2025	$ 1
Preferred Stock Mezzanine (Par Value: $0.01)
Dividends paid on preferred stock (in usd per share)				9.99
Beginning balance (in shares) at Jun. 30, 2025	415,353,394
Beginning balance at Jun. 30, 2025	$ 8,095					503	4			9,291			(957)	(204)	(542)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for restricted stock, net of forfeitures (in shares)	408,579
Shares issued for restricted stock, net of forfeitures	$ 0									(8)				8
Compensation expense related to restricted stock awards	17									17
Net loss	(36)												(36)
Dividends paid on common stock	(4)												(4)
Dividends paid on preferred stock	$ (9)												(9)
Purchase of common stock (in shares)	(153,828)
Purchase of common stock	$ (2)													(2)
Other comprehensive income (loss), net of tax	$ 47														47
Ending balance (in shares) at Sep. 30, 2025	415,608,145
Ending balance at Sep. 30, 2025	$ 8,108					$ 503	$ 4			$ 9,300			$ (1,006)	$ (198)	$ (495)
Beginning balance at Jun. 30, 2025	1
Ending balance at Sep. 30, 2025	$ 1
Preferred Stock Mezzanine (Par Value: $0.01)
Dividends paid on preferred stock (in usd per share)				$ 3.33