CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions		Total	Preferred Stock	Common Stock	Capital Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)		Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2024			16,750
Beginning balance at Dec. 31, 2024		$ 9,111	$ 426	$ 328	$ 4,808	$ 4,382	$ (1,128)	[1]	$ 295
Beginning balance (in shares) at Dec. 31, 2024				524,280,412
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		222				218			4
Other comprehensive income (loss)		145					145	[1]
Cash dividends declared:
Preferred stock		(5)				(5)
Common stock		(78)				(78)
Common stock repurchased (in shares)	[2]			(17,657,334)
Common stock repurchased	[2]	(365)		$ (11)	(354)
Excise tax on common stock repurchased		(3)			(3)
Common stock issued for:
Stock options exercised and restricted stock awards (in shares)				692,106
Stock options exercised and restricted stock awards		3			3
Stock-based compensation expense		18			18
Dividends declared - noncontrolling interest of subsidiary preferred stock		(4)							(4)
Ending balance (in shares) at Mar. 31, 2025			16,750
Ending balance at Mar. 31, 2025		9,044	$ 426	$ 317	4,472	4,517	(983)	[1]	295
Ending balance (in shares) at Mar. 31, 2025				507,315,184
Beginning balance (in shares) at Dec. 31, 2025			8,750
Beginning balance at Dec. 31, 2025		9,142	$ 349	$ 303	3,974	5,031	(810)	[3]	295
Beginning balance (in shares) at Dec. 31, 2025				484,825,395
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		266				262			4
Other comprehensive income (loss)		(22)					(22)	[3]
Cash dividends declared:
Preferred stock		(5)				(5)
Common stock		(83)				(83)
Preferred stock issuance (in shares)			4,000
Preferred stock issuance		392	$ 392
Common stock repurchased (in shares)	[4]			(9,578,588)
Common stock repurchased	[4]	(235)		$ (6)	(229)
Excise tax on common stock repurchased		(2)			(2)
Common stock issued for:
Stock options exercised and restricted stock awards (in shares)				475,425
Stock options exercised and restricted stock awards		3			3
Stock-based compensation expense		13			13
Dividends declared - noncontrolling interest of subsidiary preferred stock		$ (4)							(4)
Ending balance (in shares) at Mar. 31, 2026		12,750	12,750
Ending balance at Mar. 31, 2026		$ 9,465	$ 741	$ 297	$ 3,759	$ 5,205	$ (832)	[3]	$ 295
Ending balance (in shares) at Mar. 31, 2026				475,722,232

[1] Due to the nature of the preferred stock issued by FHN and its subsidiaries, all components of other comprehensive income (loss) have been attributed solely to FHN as the controlling interest holder.

[2] Includes $360 million repurchased under FHN's general purchase program.

[3] Due to the nature of the preferred stock issued by FHN and its subsidiaries, all components of other comprehensive income (loss) have been attributed solely to FHN as the controlling interest holder.

[4] Includes $233 million repurchased under FHN's general purchase program