CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Millions		Total	Adjustment	Adjusted Balance	Preferred Stock	Preferred Stock Adjusted Balance	Common Sock	Common Sock Adjusted Balance	Capital Surplus	Capital Surplus Adjusted Balance	Retained Earnings	Retained Earnings Adjustment	Retained Earnings Adjusted Balance	Accumulated Other Comprehensive Income (Loss)		Accumulated Other Comprehensive Income (Loss) Adjusted Balance	[1]	Noncontrolling Interest	Noncontrolling Interest Adjusted Balance
Beginning balance (in shares) at Dec. 31, 2018					1,000	1,000	318,573	318,573
Beginning balance at Dec. 31, 2018		$ 4,786	$ (1)	$ 4,785	$ 96	$ 96	$ 200	$ 200	$ 3,029	$ 3,029	$ 1,542	$ (1)	$ 1,541	$ (376)	[1]	$ (376)		$ 295	$ 295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		452									441							11
Other comprehensive income (loss)		137												137	[1]
Comprehensive income (loss)		589									441			137	[1]			11
Cash dividends declared:
Preferred stock		(6)									(6)
Common stock		(178)									(178)
Common stock repurchased (in shares)	[2]						(9,100)
Common stock repurchased	[2]	(134)					$ (6)		(128)
Common stock issued for:
Stock options and restricted stock - equity awards (in shares)							1,996
Stock options and restricted stock - equity awards		9					$ 1		8
Stock-based compensation expense		22							22
Dividends declared - noncontrolling interest of subsidiary preferred stock		(11)																(11)
Ending balance (in shares) at Dec. 31, 2019					1,000	1,000	311,469	311,469
Ending balance at Dec. 31, 2019		$ 5,076	$ (96)	$ 4,980	$ 96	$ 96	$ 195	$ 195	2,931	$ 2,931	1,798	$ (96)	$ 1,702	(239)	[1]	$ (239)		295	$ 295
Common stock issued for:
Accounting Standards Update [Extensible List]		Accounting Standards Update 2016-13 [Member]
Net income		$ 857									845							12
Other comprehensive income (loss)		99												99	[1]
Comprehensive income (loss)		956			$ 0						845			99	[1]			12
Preferred stock		(23)									(23)
Common stock		(263)									(263)
Preferred stock issuance (1,500 shares issued at $100,000 per share net of offering costs) (in shares)					1,500
Preferred stock issuance (1,500 shares issued at $100,000 per share net of offering costs)		144			$ 144
Common stock repurchased (in shares)							(426)
Common stock repurchased		(4)							(4)
Stock options and restricted stock - equity awards (in shares)							1,726
Stock options and restricted stock - equity awards		7							7
Issued in business combination (in shares)	[3]				23,750		243,015
Issued in business combination	[3]	2,497			$ 230		$ 152		2,115
Stock-based compensation expense		32							32
Dividends declared - noncontrolling interest of subsidiary preferred stock		(12)																(12)
Other (in shares)	[4]						(753)
Other	[4]	(7)							(7)
Ending balance (in shares) at Dec. 31, 2020					26,250		555,031
Ending balance at Dec. 31, 2020		8,307			$ 470		$ 347		5,074		2,261			(140)	[1]			295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		1,010									999							11
Other comprehensive income (loss)		(148)												(148)	[1]
Comprehensive income (loss)		862									999			(148)	[1]			11
Cash dividends declared:
Preferred stock		(32)									(32)
Preferred stock		(37)
Common stock		(332)									(332)
Preferred stock issuance (1,500 shares issued at $100,000 per share net of offering costs) (in shares)					1,500
Preferred stock issuance (1,500 shares issued at $100,000 per share net of offering costs)		145			$ 145
Call of preferred stock (in shares)					(1,000)
Call of preferred stock		(100)			$ (95)						(5)			(5)
Common stock repurchased (in shares)							(25,063)
Common stock repurchased		(416)					$ (16)		(400)
Common stock issued for:
Stock options and restricted stock - equity awards (in shares)							3,609
Stock options and restricted stock - equity awards		28					$ 2		26
Stock-based compensation expense		43							43
Dividends declared - noncontrolling interest of subsidiary preferred stock		(11)																(11)
Ending balance (in shares) at Dec. 31, 2021					26,750		533,577
Ending balance at Dec. 31, 2021		$ 8,494			$ 520		$ 333		$ 4,743		$ 2,891			$ (288)	[1]			$ 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] 2021, 2020, and 2019 include $401 million, $4 million, and $130 million, respectively, repurchased under share repurchase programs.

[3] See Note 2- Acquisitions and Divestitures for additional information.

[4] Represents shares canceled in connection with the resolution of remaining CBF dissenters' appraisal process and to cover taxes on the IBKC equity compensation grants that automatically vested as part of the merger.