Consolidated Statements of Changes in Equity - USD ($) $ in Millions		Total	Adjustment	Series G	Series D	Series B	Preferred Stock	Preferred Stock Series D	Preferred Stock Series B	Common Stock	Common Stock Series G	Capital Surplus	Capital Surplus Series G	Retained Earnings	Retained Earnings Adjustment	Retained Earnings Series D	Retained Earnings Series B	Accumulated Other Comprehensive Income (Loss)	[1]	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2022							31,686
Beginning balance at Dec. 31, 2022		$ 8,547	$ 4				$ 1,014			$ 336		$ 4,840		$ 3,430	$ 4			$ (1,368)		$ 295
Beginning balance (in shares) at Dec. 31, 2022										537,100,615
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		916												897						19
Other comprehensive income		180																180
Cash dividends declared:
Preferred stock		(32)												(32)
Common stock		(335)												(335)
Preferred stock conversion/redemption (in shares)							(4,936)
Preferred stock conversion/redemption		(494)					$ (494)
Common stock repurchased (in shares)										(806,360)
Common stock repurchased		(10)								$ (1)		(9)
Common stock issued for:
Stock options exercised and restricted stock awards (in shares)										2,801,663
Stock options exercised and restricted stock awards		5										5
Series G preferred stock conversion (in shares)											19,742,776
Series G preferred stock conversion		493		$ 493							$ 12		$ 481
Stock-based compensation expense		36								$ 2		34
Dividends declared - noncontrolling interest of subsidiary preferred stock		(19)																		(19)
Ending balance (in shares) at Dec. 31, 2023							26,750
Ending balance at Dec. 31, 2023		9,291	$ 8				$ 520			$ 349		5,351		3,964	$ 8			(1,188)		295
Ending balance (in shares) at Dec. 31, 2023										558,838,694
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		794												775						19
Other comprehensive income		60																60
Cash dividends declared:
Preferred stock		(29)												(29)
Common stock		(329)												(329)
Preferred stock conversion/redemption (in shares)								(10,000)
Preferred stock conversion/redemption					$ (100)			$ (94)								$ (6)
Excise tax on preferred stock redemption		(1)												(1)
Common stock repurchased (in shares)	[2]									(39,202,433)
Common stock repurchased	[2]	(626)								$ (25)		(601)
Excise tax on common stock repurchased		(6)										(6)
Common stock issued for:
Stock options exercised and restricted stock awards (in shares)										4,644,151
Stock options exercised and restricted stock awards		9								$ 1		8
Series G preferred stock conversion		0
Stock-based compensation expense		59								3		56
Dividends declared - noncontrolling interest of subsidiary preferred stock		(19)																		(19)
Ending balance (in shares) at Dec. 31, 2024							16,750
Ending balance at Dec. 31, 2024		9,111					$ 426			$ 328		4,808		4,382				(1,128)		295
Ending balance (in shares) at Dec. 31, 2024										524,280,412
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		998												982						16
Other comprehensive income		318																318
Cash dividends declared:
Preferred stock		(23)												(23)
Common stock		(307)												(307)
Preferred stock conversion/redemption (in shares)									(8,000)
Preferred stock conversion/redemption						$ (80)			$ (77)					(3)			$ (3)
Common stock repurchased (in shares)	[2]									(43,442,126)
Common stock repurchased	[2]	(918)								$ (27)		(891)
Excise tax on common stock repurchased		(8)										(8)
Common stock issued for:
Stock options exercised and restricted stock awards (in shares)										3,987,109
Stock options exercised and restricted stock awards		6								$ 0		6
Series G preferred stock conversion		0
Stock-based compensation expense		61								2		59
Dividends declared - noncontrolling interest of subsidiary preferred stock		$ (16)																		(16)
Ending balance (in shares) at Dec. 31, 2025		8,750				0	8,750
Ending balance at Dec. 31, 2025		$ 9,142					$ 349			$ 303		$ 3,974		$ 5,031				$ (810)		$ 295
Ending balance (in shares) at Dec. 31, 2025										484,825,395

[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] 2025 and 2024 include $894 million and $604 million, respectively, repurchased under FHN's general purchase programs.