CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Thousands, $ in Millions		Total	Preferred Stock	Common Stock	Capital Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)		Noncontrolling Interest
Balance, beginning of period (in shares) at Dec. 31, 2020			26,250	555,031
Balance, beginning of period at Dec. 31, 2020		$ 8,307	$ 470	$ 347	$ 5,074	$ 2,261	$ (140)	[1]	$ 295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		236				233			3
Other comprehensive income (loss)		(101)					(101)	[1]
Comprehensive income (loss)		135				233	(101)	[1]	3
Cash dividends declared:
Preferred stock		(8)				(8)
Common stock		(84)				(84)
Common stock repurchased (in shares)	[2]			(3,864)
Common stock repurchased	[2]	(62)		$ (2)	(60)
Common stock issued for:
Stock options exercised and restricted stock awards (in shares)				1,208
Stock options exercised and restricted stock awards		12			12
Stock-based compensation expense		10			10
Dividends declared - noncontrolling interest of subsidiary preferred stock		(3)							(3)
Balance, ending of period (in shares) at Mar. 31, 2021			26,250	552,375
Balance, end of period at Mar. 31, 2021		8,307	$ 470	$ 345	5,036	2,402	(241)	[1]	295
Balance, beginning of period (in shares) at Dec. 31, 2020			26,250	555,031
Balance, beginning of period at Dec. 31, 2020		8,307	$ 470	$ 347	5,074	2,261	(140)	[1]	295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		546
Other comprehensive income (loss)		(63)
Comprehensive income (loss)		483
Balance, ending of period (in shares) at Jun. 30, 2021			26,750	550,865
Balance, end of period at Jun. 30, 2021		8,565	$ 520	$ 344	4,997	2,612	(203)	[1]	295
Balance, beginning of period (in shares) at Mar. 31, 2021			26,250	552,375
Balance, beginning of period at Mar. 31, 2021		8,307	$ 470	$ 345	5,036	2,402	(241)	[1]	295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		311				308			3
Other comprehensive income (loss)		38					38	[1]
Comprehensive income (loss)		349				308	38	[1]	3
Cash dividends declared:
Preferred stock		(8)				(8)
Common stock		(85)				(85)
Preferred stock issuance (in shares)			1,500
Preferred stock issuance		145	$ 145
Call of preferred stock (in shares)			(1,000)
Call of preferred stock		(100)	$ (95)			(5)
Common stock repurchased (in shares)	[2]			(3,435)
Common stock repurchased	[2]	(64)		$ (3)	(61)
Common stock issued for:
Stock options exercised and restricted stock awards (in shares)				1,925
Stock options exercised and restricted stock awards		13		$ 2	11
Stock-based compensation expense		11			11
Dividends declared - noncontrolling interest of subsidiary preferred stock		(3)							(3)
Balance, ending of period (in shares) at Jun. 30, 2021			26,750	550,865
Balance, end of period at Jun. 30, 2021		8,565	$ 520	$ 344	4,997	2,612	(203)	[1]	295
Balance, beginning of period (in shares) at Dec. 31, 2021			26,750	533,577
Balance, beginning of period at Dec. 31, 2021		8,494	$ 520	$ 333	4,743	2,891	(288)	[3]	295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		198				195			3
Other comprehensive income (loss)		(423)					(423)	[3]
Comprehensive income (loss)		(225)				195	(423)	[3]	3
Cash dividends declared:
Preferred stock		(8)				(8)
Common stock		(82)				(82)
Preferred stock issuance (in shares)			4,936
Preferred stock issuance		494	$ 494
Common stock repurchased (in shares)				(120)
Common stock repurchased		(2)			(2)
Common stock issued for:
Stock options exercised and restricted stock awards (in shares)				1,130
Stock options exercised and restricted stock awards		15		$ 1	14
Stock-based compensation expense		14			14
Dividends declared - noncontrolling interest of subsidiary preferred stock		(3)							(3)
Balance, ending of period (in shares) at Mar. 31, 2022			31,686	534,587
Balance, end of period at Mar. 31, 2022		8,697	$ 1,014	$ 334	4,769	2,996	(711)	[3]	295
Balance, beginning of period (in shares) at Dec. 31, 2021			26,750	533,577
Balance, beginning of period at Dec. 31, 2021		8,494	$ 520	$ 333	4,743	2,891	(288)	[3]	295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		374
Other comprehensive income (loss)		(675)
Comprehensive income (loss)		(301)
Balance, ending of period (in shares) at Jun. 30, 2022			31,686	536,333
Balance, end of period at Jun. 30, 2022		8,551	$ 1,014	$ 335	4,791	3,079	(963)	[3]	295
Balance, beginning of period (in shares) at Mar. 31, 2022			31,686	534,587
Balance, beginning of period at Mar. 31, 2022		8,697	$ 1,014	$ 334	4,769	2,996	(711)	[3]	295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		177				174			3
Other comprehensive income (loss)		(252)					(252)	[3]
Comprehensive income (loss)		(75)				174	(252)	[3]	3
Cash dividends declared:
Preferred stock		(8)				(8)
Common stock		(83)				(83)
Common stock repurchased (in shares)				(334)
Common stock repurchased		(8)		$ (1)	(7)
Common stock issued for:
Stock options exercised and restricted stock awards (in shares)				2,080
Stock options exercised and restricted stock awards		13		$ 2	11
Stock-based compensation expense		18			18
Dividends declared - noncontrolling interest of subsidiary preferred stock		(3)							(3)
Balance, ending of period (in shares) at Jun. 30, 2022			31,686	536,333
Balance, end of period at Jun. 30, 2022		$ 8,551	$ 1,014	$ 335	$ 4,791	$ 3,079	$ (963)	[3]	$ 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] Includes $59 million and $57 million repurchased under share repurchase programs for the three months ended March 31, 2021 and June 30, 2021, respectively.

[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.