Business Segment Information - Amounts of Consolidated Revenue, Expense, Tax and Assets by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Interest income	$ 1,004	$ 1,014
Interest expense	337	383
Funds transfer pricing	0	0
Net interest income	667	631
Noninterest income	195	181
Total revenues	862	812
Noninterest expense	505	487
Pre-provision net revenue	357	325
Provision for credit losses	15	40
Income before income taxes	342	285
Income tax expense (benefit)	76	63
Net income	266	222
Average assets	83,045	80,965
Depreciation and amortization	22	21
Expenditures for long-lived assets	8	9
Commercial, Consumer & Wealth
Disaggregation of Revenue [Line Items]
Interest income	788	814
Interest expense	231	291
Funds transfer pricing	93	110
Net interest income	650	633
Noninterest income	119	110
Total revenues	769	743
Noninterest expense	368	344
Pre-provision net revenue	401	399
Provision for credit losses	8	38
Income before income taxes	393	361
Income tax expense (benefit)	94	86
Net income	299	275
Average assets	58,996	58,717
Depreciation and amortization	12	9
Expenditures for long-lived assets	6	5
Wholesale
Disaggregation of Revenue [Line Items]
Interest income	137	124
Interest expense	25	28
Funds transfer pricing	(50)	(46)
Net interest income	62	50
Noninterest income	64	59
Total revenues	126	109
Noninterest expense	83	75
Pre-provision net revenue	43	34
Provision for credit losses	9	3
Income before income taxes	34	31
Income tax expense (benefit)	8	8
Net income	26	23
Average assets	10,062	8,495
Depreciation and amortization	1	2
Expenditures for long-lived assets	0	1
Corporate
Disaggregation of Revenue [Line Items]
Interest income	79	76
Interest expense	81	64
Funds transfer pricing	(43)	(64)
Net interest income	(45)	(52)
Noninterest income	12	12
Total revenues	(33)	(40)
Noninterest expense	54	68
Pre-provision net revenue	(87)	(108)
Provision for credit losses	(2)	(1)
Income before income taxes	(85)	(107)
Income tax expense (benefit)	(26)	(31)
Net income	(59)	(76)
Average assets	13,987	13,753
Depreciation and amortization	9	10
Expenditures for long-lived assets	$ 2	3
Special assessment fee expense		1
Corporate \| Visa Class B Shares
Disaggregation of Revenue [Line Items]
Derivative valuation adjustment prior sales of Visa Class B shares		$ 5

FIRST HORIZON CORP 10-Q