CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Thousands, $ in Millions		Total	Cumulative Effect, Period of Adoption, Adjustment	Adjusted balance	Preferred Stock	Preferred Stock Adjusted balance	Common Stock	Common Stock Adjusted balance	Capital Surplus	Capital Surplus Adjusted balance	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Adjusted balance	Accumulated Other Comprehensive Income/(Loss)		Accumulated Other Comprehensive Income/(Loss) Adjusted balance	[1]	Noncontrolling Interest	Noncontrolling Interest Adjusted balance
Balance, beginning of period (in shares) at Dec. 31, 2019					1,000	1,000	311,469	311,469
Balance, beginning of period 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		16									13							3
Other comprehensive income (loss)		104												104	[1]
Comprehensive income (loss)		120									13			104	[1]			3
Cash dividends declared:
Preferred stock		(1)									(1)
Common stock		(48)									(48)
Common stock repurchased (in shares)							(141)
Common stock repurchased		(2)					$ 0		(2)
Common stock issued for:
Stock options and restricted stock - equity awards (in shares)							652
Stock options and restricted stock - equity awards		4					$ 0		4
Stock-based compensation expense		7							7
Dividends declared - noncontrolling interest of subsidiary preferred stock		(3)																(3)
Other (in shares)	[2]						(117)
Other	[2]	(1)					$ 0		(1)
Balance, ending of period (in shares) at Mar. 31, 2020					1,000		311,863
Balance, end of period at Mar. 31, 2020		5,056			$ 96		$ 195		2,939		1,666			(135)	[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)	[3]			295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		236									233							3
Other comprehensive income (loss)		(101)												(101)	[3]
Comprehensive income (loss)		135									233			(101)	[3]			3
Cash dividends declared:
Preferred stock		(8)									(8)
Common stock		(84)									(84)
Common stock repurchased (in shares)	[4]						(3,864)
Common stock repurchased	[4]	(62)					$ (2)		(60)
Common stock issued for:
Stock options and restricted stock - equity awards (in shares)							1,208
Stock options and restricted stock - equity awards		12					$ 0		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)	[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] Represents shares canceled in connection with the resolution of remaining Capital Bank Financial Corporation ("CBF") dissenters' appraisal process.

[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 $59 million repurchased under share repurchase programs.