CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Mar. 31, 2025		Mar. 31, 2024		Dec. 31, 2023
Common stock - cash dividends declared per share (in dollars per share)	$ 0.15		$ 0.15
Accounting Standards Update [Extensible List]					Accounting Standards Update 2022-02 [Member]
Common stock repurchased under share repurchase program	$ 365	[1]	$ 159	[2]
General Purchase Plan
Common stock repurchased under share repurchase program	360		154
Share repurchase program, authorized, amount	$ 1,000		$ 650

[1] Includes $360 million repurchased under FHN's $1 billion general purchase program approved in October 2024 and scheduled to expire in January 2026.

[2] Includes $154 million repurchased under FHN's $650 million general purchase program approved in January 2024 and terminated in October 2024.