CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity, Class of Treasury Stock [Line Items]
Common stock - cash dividends declared per share (in dollars per share)	$ 0.60	$ 0.60	$ 0.56
Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	1,500	1,500
Sale of stock (in dollars per share)	$ 100,000	$ 100,000
First Horizon Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased under share repurchase programs	$ 401	$ 4	$ 130