CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions		Total	Series D	Series G	Adjustment	Preferred Stock	Preferred Stock Series D	Common Stock	Common Stock Series G	Capital Surplus	Capital Surplus Series G	Retained Earnings	Retained Earnings Series D	Retained Earnings Adjustment	Accumulated Other Comprehensive Income (Loss)		Noncontrolling Interest
Preferred stock, balance, beginning of period (in shares) at Dec. 31, 2022						31,686,000
Common stock, balance, beginning of period (in shares) at Dec. 31, 2022								537,101,000
Balance, beginning of period at Dec. 31, 2022		$ 8,547			$ 4	$ 1,014		$ 336		$ 4,840		$ 3,430		$ 4	$ (1,368)	[1]	$ 295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		255										251					4
Other comprehensive income (loss)		160													160	[1]
Cash dividends declared:
Preferred stock		(8)										(8)
Common stock		(82)										(82)
Common stock repurchased (in shares)								(159,000)
Common stock repurchased		(4)								(4)
Common stock issued for:
Stock options exercised and restricted stock awards (in shares)								677,000
Stock options exercised and restricted stock awards		5								5
Stock-based compensation expense		22								22
Dividends declared - noncontrolling interest of subsidiary preferred stock		(4)															(4)
Preferred stock, balance, ending of period (in shares) at Mar. 31, 2023						31,686,000
Common stock, balance, ending of period (in shares) at Mar. 31, 2023								537,619,000
Balance, ending of period at Mar. 31, 2023		8,895				$ 1,014		$ 336		4,863		3,595			(1,208)	[1]	295
Preferred stock, balance, beginning of period (in shares) at Dec. 31, 2022						31,686,000
Common stock, balance, beginning of period (in shares) at Dec. 31, 2022								537,101,000
Balance, beginning of period at Dec. 31, 2022		8,547			4	$ 1,014		$ 336		4,840		3,430		4	(1,368)	[1]	295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		585
Other comprehensive income (loss)		9													9
Common stock issued for:
Series G preferred stock conversion		493
Preferred stock, balance, ending of period (in shares) at Jun. 30, 2023						26,750,000
Common stock, balance, ending of period (in shares) at Jun. 30, 2023								558,659,000
Balance, ending of period at Jun. 30, 2023		8,960				$ 520		$ 349		5,325		3,830			(1,359)	[1]	295
Preferred stock, balance, beginning of period (in shares) at Dec. 31, 2022						31,686,000
Common stock, balance, beginning of period (in shares) at Dec. 31, 2022								537,101,000
Balance, beginning of period at Dec. 31, 2022		8,547			4	$ 1,014		$ 336		4,840		3,430		4	(1,368)	[1]	295
Preferred stock, balance, ending of period (in shares) at Dec. 31, 2023						26,750,000
Common stock, balance, ending of period (in shares) at Dec. 31, 2023								558,839,000
Balance, ending of period at Dec. 31, 2023		$ 9,291			8	$ 520		$ 349		5,351		3,964		8	(1,188)	[2]	295
Common stock issued for:
Accounting Standards Update [Extensible List]		Accounting Standards Update 2023-02
Preferred stock, balance, beginning of period (in shares) at Mar. 31, 2023						31,686,000
Common stock, balance, beginning of period (in shares) at Mar. 31, 2023								537,619,000
Balance, beginning of period at Mar. 31, 2023		$ 8,895				$ 1,014		$ 336		4,863		3,595			(1,208)	[1]	295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		329										325					4
Other comprehensive income (loss)		(151)													(151)	[1]
Cash dividends declared:
Preferred stock		(8)										(8)
Common stock		(82)										(82)
Series D preferred stock redemption (in shares)						(4,936,000)
Series D preferred stock redemption		(494)				$ (494)						0
Common stock repurchased (in shares)								(575,000)
Common stock repurchased		(5)								(5)
Common stock issued for:
Stock options exercised and restricted stock awards (in shares)								1,872,000
Stock options exercised and restricted stock awards		0
Series G preferred stock conversion (in shares)									19,743,000
Series G preferred stock conversion				$ 493					$ 12		$ 481
Stock-based compensation expense		(13)						$ 1		(14)
Dividends declared - noncontrolling interest of subsidiary preferred stock		(4)															(4)
Preferred stock, balance, ending of period (in shares) at Jun. 30, 2023						26,750,000
Common stock, balance, ending of period (in shares) at Jun. 30, 2023								558,659,000
Balance, ending of period at Jun. 30, 2023		8,960				$ 520		$ 349		5,325		3,830			(1,359)	[1]	295
Preferred stock, balance, beginning of period (in shares) at Dec. 31, 2023						26,750,000
Common stock, balance, beginning of period (in shares) at Dec. 31, 2023								558,839,000
Balance, beginning of period at Dec. 31, 2023		9,291			8	$ 520		$ 349		5,351		3,964		8	(1,188)	[2]	295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		197										192					5
Other comprehensive income (loss)		(83)													(83)	[2]
Cash dividends declared:
Preferred stock		(8)										(8)
Common stock		(84)										(84)
Common stock repurchased (in shares)	[3]							(11,052,000)
Common stock repurchased	[3]	(159)						$ (7)		(152)
Excise tax on common stock repurchased		(2)								(2)
Common stock issued for:
Stock options exercised and restricted stock awards (in shares)								850,000
Stock options exercised and restricted stock awards		0
Stock-based compensation expense		18						$ 1		17
Dividends declared - noncontrolling interest of subsidiary preferred stock		(5)															(5)
Preferred stock, balance, ending of period (in shares) at Mar. 31, 2024						26,750,000
Common stock, balance, ending of period (in shares) at Mar. 31, 2024								548,637,000
Balance, ending of period at Mar. 31, 2024		9,173				$ 520		$ 343		5,214		4,072			(1,271)	[2]	295
Preferred stock, balance, beginning of period (in shares) at Dec. 31, 2023						26,750,000
Common stock, balance, beginning of period (in shares) at Dec. 31, 2023								558,839,000
Balance, beginning of period at Dec. 31, 2023		9,291			$ 8	$ 520		$ 349		5,351		3,964		$ 8	(1,188)	[2]	295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		401
Other comprehensive income (loss)		(93)													(93)
Cash dividends declared:
Series D preferred stock redemption												(7)
Common stock issued for:
Series G preferred stock conversion		$ 0
Preferred stock, balance, ending of period (in shares) at Jun. 30, 2024		16,750	0			16,750,000
Common stock, balance, ending of period (in shares) at Jun. 30, 2024								536,876,000
Balance, ending of period at Jun. 30, 2024		$ 8,955				$ 426		$ 336		5,007		4,172			(1,281)	[2]	295
Preferred stock, balance, beginning of period (in shares) at Mar. 31, 2024						26,750,000
Common stock, balance, beginning of period (in shares) at Mar. 31, 2024								548,637,000
Balance, beginning of period at Mar. 31, 2024		9,173				$ 520		$ 343		5,214		4,072			(1,271)	[2]	295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		204										199					5
Other comprehensive income (loss)		(10)													(10)	[2]
Cash dividends declared:
Preferred stock		(8)										(8)
Common stock		(84)										(84)
Series D preferred stock redemption (in shares)							(10,000,000)
Series D preferred stock redemption			$ (100)				$ (94)					(7)	$ (6)
Excise tax on preferred stock redemption		(1)										(1)
Common stock repurchased (in shares)	[3]							(14,896,000)
Common stock repurchased	[3]	(228)						$ (9)		(219)
Excise tax on common stock repurchased		(1)								(1)
Common stock issued for:
Stock options exercised and restricted stock awards (in shares)								3,135,000
Stock options exercised and restricted stock awards		2						$ 1		1
Stock-based compensation expense		13						$ 1		12
Dividends declared - noncontrolling interest of subsidiary preferred stock		$ (5)															(5)
Preferred stock, balance, ending of period (in shares) at Jun. 30, 2024		16,750	0			16,750,000
Common stock, balance, ending of period (in shares) at Jun. 30, 2024								536,876,000
Balance, ending of period at Jun. 30, 2024		$ 8,955				$ 426		$ 336		$ 5,007		$ 4,172			$ (1,281)	[2]	$ 295

[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] 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.

[3] Includes $154 million and $212 million repurchased during first and second quarter, respectively, under FHN's general purchase program