CONSOLIDATED CONDENSED STATEMENTS OF EQUITY (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Preferred stock - cash dividends declared per share (in dollars per share)	$ 1,550	$ 1,550	$ 1,550	$ 1,550
Common stock - cash dividends declared per share (in dollars per share)	$ 0.14	$ 0.14	$ 0.12	$ 0.12
First Horizon Share Repurchase Program
Common stock repurchased under share repurchase program	$ 50.2	$ 51.5