First Horizon (FHN) 10-Q 5 Nov 21 2021 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2021	Oct. 29, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	001-15185
Entity Registrant Name	FIRST HORIZON CORP
Entity Incorporation, State or Country Code	TN
Entity Tax Identification Number	62-0803242
Entity Address, Address Line One	165 Madison Avenue
Entity Address, City or Town	Memphis,
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	38103
City Area Code	901
Local Phone Number	523-4444
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		540,750,202
Entity Central Index Key	0000036966
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false
$.625 Par Value Common Capital Stock
Entity Information [Line Items]
Title of 12(b) Security	$.625 Par Value Common Capital Stock
Trading Symbol	FHN
Security Exchange Name	NYSE
Depositary Shares, each representing a 1/400th interest in a share of Non-Cumulative Perpetual Preferred Stock, Series B
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing a 1/400th interest ina share of Non-Cumulative Perpetual Preferred Stock, Series B
Trading Symbol	FHN PR B
Security Exchange Name	NYSE
Depositary Shares, each representing a 1/400th interest in a share of Non-Cumulative Perpetual Preferred Stock, Series C
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing a 1/400th interest ina share of Non-Cumulative Perpetual Preferred Stock, Series C
Trading Symbol	FHN PR C
Security Exchange Name	NYSE
Depositary Shares, each representing a 1/400th interest in a share of Non-Cumulative Perpetual Preferred Stock, Series D
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing a 1/400th interest ina share of Non-Cumulative Perpetual Preferred Stock, Series D
Trading Symbol	FHN PR D
Security Exchange Name	NYSE
Depositary Shares, each representing a 1/4,000th interest in a share of Non-Cumulative Perpetual Preferred Stock, Series E
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing a 1/4,000th interest ina share of Non-Cumulative Perpetual Preferred Stock, Series E
Trading Symbol	FHN PR E
Security Exchange Name	NYSE
Depositary Shares, each representing a 1/4,000th interest in a share of Non-Cumulative Perpetual Preferred Stock, Series F
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing a 1/4,000th interest ina share of Non-Cumulative Perpetual Preferred Stock, Series F
Trading Symbol	FHN PR F
Security Exchange Name	NYSE

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 1,197	$ 1,203
Interest-bearing deposits with banks	14,829	8,351
Federal funds sold and securities purchased under agreements to resell	361	445
Trading securities	1,319	1,176
Securities available for sale at fair value	8,494	8,047
Securities held to maturity (fair value of $303 and $10, respectively)	304	10
Loans held for sale (including $301 and $405 at fair value, respectively)	1,052	1,022
Loans and leases (including $— and $16 at fair value, respectively)	55,435	58,232
Allowance for loan and lease losses	(734)	(963)
Net loans and leases	54,701	57,269
Premises and equipment	692	759
Goodwill	1,511	1,511
Other intangible assets	311	354
Other assets	3,766	4,062
Total assets	88,537	84,209
Liabilities
Noninterest-bearing deposits	27,348	22,173
Interest-bearing deposits	46,916	47,809
Total deposits	74,264	69,982
Trading liabilities	315	353
Short-term borrowings	2,225	2,198
Term borrowings	1,584	1,670
Other liabilities	1,617	1,699
Total liabilities	80,005	75,902
Equity
Preferred stock, Non-cumulative perpetual, no par value; authorized 5,000,000 shares; issued 26,750 and 26,250 shares, respectively	520	470
Common stock, $0.625 par value; authorized 700,000,000 shares; issued 541,859,599 and 555,030,652 shares, respectively	339	347
Capital surplus	4,866	5,074
Retained earnings	2,753	2,261
Accumulated other comprehensive loss, net	(241)	(140)
FHN shareholders' equity	8,237	8,012
Noncontrolling interest	295	295
Total equity	8,532	8,307
Total liabilities and equity	$ 88,537	$ 84,209

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Securities held to maturity, at fair value	$ 303	$ 10
Loans held-for-sale, at fair value	301	405
Loans and leases, at fair value	$ 0	$ 16
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	26,750	26,250
Common stock, par value (in dollars per share)	$ 0.625	$ 0.625
Common stock, shares authorized (in shares)	700,000,000	700,000,000
Common stock, shares issued (in shares)	541,859,599	555,030,652

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest income
Interest and fees on loans and leases	$ 482	$ 557	$ 1,485	$ 1,190
Interest and fees on loans held for sale	8	8	22	22
Interest on investment securities	31	26	88	78
Interest on trading securities	6	6	20	28
Interest on other earning assets	6	1	11	5
Total interest income	533	598	1,626	1,323
Interest expense
Interest on deposits	20	42	67	122
Interest on trading liabilities	1	1	4	5
Interest on short-term borrowings	2	1	4	12
Interest on term borrowings	18	22	55	44
Total interest expense	41	66	130	183
Net interest income	492	532	1,496	1,140
Provision for credit losses	(85)	227	(245)	502
Net interest income after provision for credit losses	577	305	1,741	638
Noninterest income
Fixed income	96	111	324	319
Deposit transactions and cash management	44	42	130	103
Mortgage banking and title income	34	66	126	72
Brokerage, management fees and commissions	24	18	65	47
Bankcard income	15	10	40	24
Trust services and investment management	13	12	39	27
Securities gains (losses), net	1	(1)	12	(2)
Purchase accounting gain	0	532	(1)	532
Loss on debt extinguishment	(23)	0	(23)	0
Other income	43	33	117	82
Total noninterest income	247	823	829	1,204
Noninterest expense
Personnel expense	296	329	920	713
Net occupancy expense	33	39	103	80
Computer software	30	26	87	58
Operations services	24	16	59	39
Legal and professional fees	21	43	52	65
Contract employment and outsourcing	21	6	47	16
Amortization of intangible assets	14	15	42	25
Equipment expense	12	12	35	29
Communications and delivery	9	10	28	21
Contributions	6	39	12	40
Other expense	60	52	182	124
Total noninterest expense	526	587	1,567	1,210
Income before income taxes	298	541	1,003	632
Income tax expense	63	2	222	20
Net income	235	539	781	612
Net income attributable to noncontrolling interest	3	3	9	8
Net income attributable to controlling interest	232	536	772	604
Preferred stock dividends	8	13	29	16
Net income available to common shareholders	$ 224	$ 523	$ 743	$ 588
Basic earnings per common share (in dollars per share)	$ 0.41	$ 0.95	$ 1.35	$ 1.50
Diluted earnings per common share (in dollars per share)	$ 0.41	$ 0.95	$ 1.34	$ 1.50
Weighted average common shares (in shares)	545,818	549,690	549,434	391,699
Diluted average common shares (in shares)	549,819	550,846	554,199	392,713

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statements of Comprehensive Income/(loss)
Net income	$ 235	$ 539	$ 781	$ 612
Other comprehensive income (loss), net of tax:
Net unrealized gains (losses) on securities available for sale	(38)	(5)	(103)	82
Net unrealized gains (losses) on cash flow hedges	(1)	(3)	(5)	10
Net unrealized gains (losses) on pension and other postretirement plans	1	2	7	7
Other comprehensive income (loss)	(38)	(6)	(101)	99
Comprehensive income (loss)	197	533	680	711
Comprehensive income attributable to noncontrolling interest	3	3	9	8
Comprehensive income attributable to controlling interest	194	530	671	703
Income tax expense (benefit) of items included in other comprehensive income:
Net unrealized gains (losses) on securities available for sale	(12)	(2)	(33)	26
Net unrealized gains (losses) on cash flow hedges	0	(1)	(2)	3
Net unrealized gains (losses) on pension and other postretirement plans	$ 1	$ 2	$ 2	$ 4

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Thousands, $ in Millions		Total	Cumulative Effect, Period of Adoption, Adjustment	Adjusted balance	Preferred Stock	Preferred StockAdjusted balance	Common Stock	Common StockAdjusted balance	Capital Surplus	Capital SurplusAdjusted balance	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Retained EarningsAdjusted balance	Accumulated Other Comprehensive Income/(Loss)		Accumulated Other Comprehensive Income/(Loss)Adjusted balance	[1]	Noncontrolling Interest	Noncontrolling InterestAdjusted 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)							(2)
Common stock issued for:
Stock options and restricted stock - equity awards (in shares)							652
Stock options and restricted stock - equity awards		4							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, 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		612
Other comprehensive income (loss)		99
Comprehensive income (loss)		711
Balance, ending of period (in shares) at Sep. 30, 2020					26,250		554,788
Balance, end of period at Sep. 30, 2020		8,144			$ 470		$ 347		5,061		2,111			(140)	[1]			295
Balance, beginning of period (in shares) at Mar. 31, 2020					1,000		311,863
Balance, beginning of period at Mar. 31, 2020		5,056			$ 96		$ 195		2,939		1,666			(135)	[1]			295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		57									54							3
Other comprehensive income (loss)		1												1	[1]
Comprehensive income (loss)		58									54			1	[1]			3
Cash dividends declared:
Preferred stock		(2)									(2)
Common stock		(47)									(47)
Preferred stock issuance (in shares)					1,500
Preferred stock issuance		144			$ 144
Common stock repurchased (in shares)							(183)
Common stock repurchased		(1)							(1)
Common stock issued for:
Stock options and restricted stock - equity awards (in shares)							679
Stock options and restricted stock - equity awards		0
Stock-based compensation expense		3							3
Dividends declared - noncontrolling interest of subsidiary preferred stock		(3)																(3)
Balance, ending of period (in shares) at Jun. 30, 2020					2,500		312,359
Balance, end of period at Jun. 30, 2020		5,208			$ 240		$ 195		2,941		1,671			(134)	[1]			295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		539									536							3
Other comprehensive income (loss)		(6)												(6)	[1]
Comprehensive income (loss)		533									536			(6)	[1]			3
Cash dividends declared:
Preferred stock		(13)									(13)
Common stock		(83)									(83)
Common stock repurchased (in shares)							(88)
Common stock repurchased		(1)							(1)
Common stock issued for:
Stock options and restricted stock - equity awards (in shares)							138
Stock options and restricted stock - equity awards		0
Issued in business combination (in shares)					23,750		243,015
Issued in business combination		2,497			$ 230		$ 152		2,115
Stock-based compensation expense		12							12
Dividends declared - noncontrolling interest of subsidiary preferred stock		(3)																(3)
Other (in shares)	[3]						(636)
Other	[3]	(6)							(6)
Balance, ending of period (in shares) at Sep. 30, 2020					26,250		554,788
Balance, end of period at Sep. 30, 2020		8,144			$ 470		$ 347		5,061		2,111			(140)	[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)	[4]			295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		236									233							3
Other comprehensive income (loss)		(101)												(101)	[4]
Comprehensive income (loss)		135									233			(101)	[4]			3
Cash dividends declared:
Preferred stock		(8)									(8)
Common stock		(84)									(84)
Common stock repurchased (in shares)	[5]						(3,864)
Common stock repurchased	[5]	(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							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)	[4]			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)	[4]			295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		781
Other comprehensive income (loss)		(101)
Comprehensive income (loss)		680
Cash dividends declared:
Call of preferred stock											(5)
Balance, ending of period (in shares) at Sep. 30, 2021					26,750		541,860
Balance, end of period at Sep. 30, 2021		8,532			$ 520		$ 339		4,866		2,753			(241)	[4]			295
Balance, beginning of period (in shares) at Mar. 31, 2021					26,250		552,375
Balance, beginning of period at Mar. 31, 2021		8,307			$ 470		$ 345		5,036		2,402			(241)	[4]			295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		311									308							3
Other comprehensive income (loss)		38												38	[4]
Comprehensive income (loss)		349									308			38	[4]			3
Cash dividends declared:
Preferred stock		(8)									(8)
Common stock		(85)									(85)
Preferred stock issuance (in shares)					1,500
Preferred stock issuance		145			$ 145
Call of preferred stock (in shares)					(1,000)
Call of preferred stock		(100)			$ (95)						(5)
Common stock repurchased (in shares)	[5]						(3,435)
Common stock repurchased	[5]	(64)					$ (3)		(61)
Common stock issued for:
Stock options and restricted stock - equity awards (in shares)							1,925
Stock options and restricted stock - equity awards		13					$ 2		11
Stock-based compensation expense		11							11
Dividends declared - noncontrolling interest of subsidiary preferred stock		(3)																(3)
Balance, ending of period (in shares) at Jun. 30, 2021					26,750		550,865
Balance, end of period at Jun. 30, 2021		8,565			$ 520		$ 344		4,997		2,612			(203)	[4]			295
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		235									232							3
Other comprehensive income (loss)		(38)												(38)	[4]
Comprehensive income (loss)		197									232			(38)	[4]			3
Cash dividends declared:
Preferred stock		(8)									(8)
Common stock		(83)									(83)
Common stock repurchased (in shares)	[5]						(9,235)
Common stock repurchased	[5]	(146)					$ (5)		(141)
Common stock issued for:
Stock options and restricted stock - equity awards (in shares)							230
Stock-based compensation expense		10							10
Dividends declared - noncontrolling interest of subsidiary preferred stock		(3)																(3)
Balance, ending of period (in shares) at Sep. 30, 2021					26,750		541,860
Balance, end of period at Sep. 30, 2021		$ 8,532			$ 520		$ 339		$ 4,866		$ 2,753			$ (241)	[4]			$ 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 CBF dissenters' appraisal process.
[3]	Represents shares canceled to cover taxes on the IBKC equity compensation grants that automatically vested as part of the merger.
[4]	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.
[5]	Includes $59 million, $57 million and $141 million repurchased under share repurchase programs for the three months ended March 31, 2021, June 30, 2021, and September 30, 2021, respectively.

CONSOLIDATED CONDENSED STATEMEN

CONSOLIDATED CONDENSED STATEMENTS OF EQUITY (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2021		Jun. 30, 2021		Mar. 31, 2021		Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Preferred stock - cash dividends declared per share (in dollars per share)								$ 1,550	$ 1,550
Common stock - cash dividends declared per share (in dollars per share)	$ 0.15		$ 0.15		$ 0.15		$ 0.15	$ 0.15	$ 0.15
Common stock repurchased under share repurchase program	$ 146	[1]	$ 64	[1]	$ 62	[1]	$ 1	$ 1	$ 2
First Horizon Share Repurchase Program
Common stock repurchased under share repurchase program	$ 141		$ 57		$ 59
Preferred Stock
Number of shares issued in transaction (in shares)			1,500					1,500
Preferred stock issuance, net of offering cost (in dollars per share)			$ 100,000					$ 100,000
[1]	Includes $59 million, $57 million and $141 million repurchased under share repurchase programs for the three months ended March 31, 2021, June 30, 2021, and September 30, 2021, respectively.

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Operating Activities
Net income	$ 235	$ 236	$ 539	$ 16	$ 781	$ 612
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for credit losses					(245)	502
Deferred income tax expense (benefit)					(28)	(82)
Depreciation and amortization of premises and equipment					46	37
Amortization of intangible assets	14		15		42	25
Net other amortization and accretion					(50)	(18)
Net (increase) decrease in derivatives					309	(325)
Purchase accounting gain	0		(532)		1	(532)
Stock-based compensation expense					31	23
Securities (gains) losses, net					(12)	2
Gain (loss) on extinguishment of debt	23		0		23	0
Net (gains) losses on sale/disposal of fixed assets					32	7
(Gain) loss on BOLI					(5)	(4)
Loans held for sale:
Purchases and originations					(4,682)	(2,780)
Gross proceeds from settlements and sales					3,288	1,578
(Gain) loss due to fair value adjustments and other					(142)	(43)
Other operating activities, net					1,179	725
Total adjustments					(213)	(885)
Net cash provided by (used in) operating activities					568	(273)
Investing Activities
Proceeds from sales of securities available for sale	35		240		68	249
Proceeds from maturities of securities available for sale					1,680	2,993
Purchases of securities available for sale					(2,343)	(3,166)
Purchases of securities held to maturity					(304)	0
Proceeds from prepayments of securities held to maturity					10	0
Proceeds from sales of premises and equipment					22	9
Purchases of premises and equipment					(46)	(35)
Proceeds from BOLI					12	8
Net (increase) decrease in loans and leases					2,891	(2,310)
Net increase in interest-bearing deposits with banks					(6,478)	(3,013)
Cash received for acquisitions, net					0	1,806
Other investing activities, net					15	10
Net cash used in investing activities					(4,473)	(3,449)
Common stock:
Stock options exercised					25	4
Cash dividends paid					(252)	(139)
Repurchase of shares					(272)	(4)
Cancellation of common shares					0	(8)
Preferred stock:
Preferred stock issuance					145	145
Cash dividends paid - preferred stock - noncontrolling interest					(9)	(9)
Cash dividends paid - preferred stock					(24)	(8)
Net increase in deposits					4,287	5,561
Net increase (decrease) in short-term borrowings					27	(1,585)
Proceeds from issuance of term borrowings					0	1,241
Increases (decreases) in term borrowings					(112)	(1,075)
Net cash provided by financing activities					3,815	4,123
Net increase (decrease) in cash and cash equivalents					(90)	401
Cash and cash equivalents at beginning of period		$ 1,648		$ 1,267	1,648	1,267	$ 1,267
Cash and cash equivalents at end of period	$ 1,558		$ 1,668		1,558	1,668	$ 1,648
Supplemental Disclosures
Total interest paid					128	181
Total taxes paid					254	90
Total taxes refunded					28	1
Transfer from loans to OREO					3	2
Transfer from loans HFS to trading securities					1,490	1,083
Transfer from loans to loans HFS					$ (31)	$ 4

Basis of Presentation and Accou

Basis of Presentation and Accounting Policies	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Accounting Policies	Basis of Presentation and Accounting Policies The accompanying unaudited consolidated financial statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all information and notes necessary for complete financial statements in accordance with GAAP. In the opinion of management, the accompanying unaudited consolidated financial statements contain all significant adjustments, consisting of normal and recurring items, considered necessary for fair presentation. These interim financial statements should be read in conjunction with FHN's audited consolidated financial statements and notes in FHN's Annual Report on Form 10-K for the year ended December 31, 2020. Operating results for the interim period are not necessarily indicative of the results that may be expected for the full year. All significant intercompany balances and transactions have been eliminated in consolidation. Certain amounts reported in prior years have been reclassified to conform to the current period presentation. See the Glossary of Acronyms and Terms included in this Report for terms used herein. Accounting Changes With Extended Transition Periods In March 2020, the FASB issued ASU 2020-04, “Facilitation of the Effects of Reference Rate Reform on Financial Reporting” which provides several optional expedients and exceptions to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. The provisions of ASU 2020-04 primarily affect 1) contract modifications (e.g., loans, leases, debt, and derivatives) made in anticipation that a reference rate (e.g., LIBOR) will be discontinued and 2) the application of hedge accounting for existing relationships affected by those modifications. The provisions of ASU 2020-04 are effective upon release and apply only to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The expedients and exceptions provided by ASU 2020-04 do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. FHN has identified contracts affected by reference rate reform and developed modification plans for those contracts. FHN has elected to utilize the optional expedients and exceptions provided by ASU 2020-04 for certain contract modifications that have already been implemented. FHN anticipates that it will continue to utilize the expedients and exceptions for future modifications in situations where they mitigate potential accounting outcomes that do not faithfully represent management’s intent or risk management activities, consistent with the purpose of the standard. In January 2021, the FASB issued ASU 2021-01, "Scope" to expand the scope of ASU 2020-04 to apply to certain contract modifications that were implemented in October 2020 by derivative clearinghouses for the use of Secure Overnight Funding Rate (SOFR) in discounting, margining and price alignment for centrally cleared derivatives, including derivatives utilized in hedging relationships. ASU 2021-01 also applies to derivative contracts affected by the change in discounting convention regardless of whether they are centrally cleared (i.e., bi-lateral contracts can also be modified) and regardless of whether they reference LIBOR. ASU 2021-01 was effective immediately upon issuance with retroactive application permitted. FHN elected to retroactively apply the provisions of ASU 2021-01 because FHN's centrally cleared derivatives were affected by the change in discounting convention and because FHN has other bi-lateral derivative contracts that may be modified to conform to the use of SOFR for discounting. Adoption did not have a significant effect on FHN's reported financial condition or results of operations.

Acquisitions and Divestitures

Acquisitions and Divestitures	9 Months Ended
	Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Acquisitions and Divestitures	Acquisitions and Divestitures On July 1, 2020, FHN and IBERIABANK Corporation closed their merger-of-equals transaction. FHN issued approximately 243 million shares of FHN common stock, plus three new series of preferred stock (Series B, Series C, and Series D) in a transaction valued at $2.5 billion. At the time of closing, IBKC operated 319 offices in 12 states, mostly in the southern U.S. The merger-of-equals transaction was accounted for as a business combination. Accordingly, the assets acquired and liabilities assumed are generally presented at their fair values as of the merger date. The determination of fair value requires management to make estimates about discount rates, future expected cash flows, market conditions and other future events that are highly subjective in nature and subject to change. The following schedule details the allocation of merger consideration to the valuations of the identifiable tangible and intangible assets acquired and liabilities assumed from IBKC as of July 1, 2020. (Dollars in millions) IBERIABANK Corporation Assets: Cash and due from banks $ 395 Interest-bearing deposits with banks 1,683 Securities available for sale at fair value 3,544 Loans held for sale 320 Loans and leases (a) 25,921 Allowance for loan and lease losses (284) Other intangible assets 240 Premises and equipment 311 OREO 9 Other assets 1,153 Total assets acquired $ 33,292 Liabilities: Deposits $ 28,232 Short-term borrowings 209 Term borrowings 1,200 Other liabilities 618 Total liabilities assumed $ 30,259 Net assets acquired $ 3,033 Consideration paid: Consideration for outstanding common stock $ 2,243 Consideration for equity awards 28 Consideration for preferred stock 231 Total consideration paid $ 2,502 Purchase accounting gain $ (531) (a) Includes $1.3 billion of initial net investments in sales-type and direct financing leases. In relation to the merger-of-equals transaction, FHN recorded a $531 million purchase accounting gain, representing the shortfall of the purchase price under the acquisition accounting value of net assets acquired, net of deferred taxes. The purchase accounting gain is not taxable. The valuation of the IBKC merger-of-equals transaction was final as of June 30, 2021. See Note 2, Acquisitions and Divestitures, in the 2020 Annual Report on Form 10-K for the year ended December 31, 2020, for a description of the methods used to determine the fair values of significant assets acquired and liabilities assumed presented above. On July 17, 2020, First Horizon Bank completed its purchase of 30 branches from Truist Bank. As of December 31, 2020, the valuation of the acquired assets and liabilities assumed from the Truist branches acquisition was final. In relation to the acquisition, FHN recorded $78 million in goodwill, representing the excess of acquisition consideration over the estimated fair value of net assets acquired. All goodwill has been attributed to FHN's Regional Banking segment (refer to Note 7 - Goodwill and Other Intangible Assets for additional information). This goodwill was the result of expected synergies, operational efficiencies and other factors. Expenses related to FHN's merger and integration activities are recorded in FHN's Corporate segment. Total merger and integration expense recognized for the three and nine months ended September 30, 2021 and 2020 are presented in the following table: Three Months Ended Nine Months Ended (Dollars in millions) 2021 2020 2021 2020 Personnel expense (a) $ 10 $ 35 $ 47 $ 41 Legal and professional fees (b) 9 31 15 38 Contribution expense (c) — 20 — 20 Other expense (d) 27 15 85 22 Total $ 46 $ 101 $ 147 $ 121 Certain previously reported amounts have been reclassified to agree with current presentation. (a) Primarily comprised of fees for severance and retention. (b) Primarily comprised of fees for legal, accounting, and merger consultants. (c) Comprised of contribution expense related to the establishment of the First Horizon Louisiana Foundation. (d) Consists of fees for operations services, communications and delivery, equipment rentals, depreciation and maintenance, supplies, travel and entertainment, computer software, advertising and public relations, contract termination charges, internal technology development costs, costs of shareholder matters and asset impairments.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2021
Marketable Securities [Abstract]
Investment Securities	Investment Securities The following tables summarize FHN’s investment securities as of September 30, 2021 and December 31, 2020: September 30, 2021 (Dollars in millions) Amortized Gross Gross Fair Securities available for sale: U.S. treasuries $ 603 $ — $ — $ 603 Government agency issued MBS 4,324 58 (37) 4,345 Government agency issued CMO 2,234 14 (31) 2,217 Other U.S. government agencies 794 6 (12) 788 States and municipalities 516 10 (1) 525 $ 8,471 $ 88 $ (81) 8,478 AFS securities recorded at fair value through earnings: SBA interest-only strips (a) 16 Total securities available for sale (b) $ 8,494 Securities held to maturity: Government agency issued MBS $ 229 $ — $ (1) $ 228 Government agency issued CMO 75 — — 75 Total securities held to maturity $ 304 $ — $ (1) $ 303 (a) SBA interest-only strips are recorded at elected fair value. See Note 17 - Fair Value of Assets and Liabilities for additional information. (b) Includes $7.5 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes. December 31, 2020 (Dollars in millions) Amortized Gross Gross Fair Securities available for sale: U.S. treasuries $ 613 $ — $ — $ 613 Government agency issued MBS 3,722 92 (2) 3,812 Government agency issued CMO 2,380 29 (3) 2,406 Other U.S. government agencies 672 12 — 684 Corporate and other debt 40 1 (1) 40 States and municipalities 445 15 — 460 $ 7,872 $ 149 $ (6) 8,015 AFS securities recorded at fair value through earnings: SBA interest-only strips (a) 32 Total securities available for sale (b) $ 8,047 Securities held to maturity: Corporates and other debt $ 10 $ — $ — $ 10 Total securities held to maturity $ 10 $ — $ — $ 10 (a) SBA interest-only strips are recorded at elected fair value. See Note 17 - Fair Value of Assets and Liabilities for additional information. (b) Includes $6.4 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes. The amortized cost and fair value by contractual maturity for the debt securities portfolio as of September 30, 2021 is provided below: Held to Maturity Available for Sale (Dollars in millions) Amortized Fair Amortized Fair Within 1 year $ — $ — $ 654 $ 654 After 1 year through 5 years — — 152 153 After 5 years through 10 years — 347 355 After 10 years — — 760 770 Subtotal — — 1,913 1,932 Government agency issued MBS and CMO (a) 304 303 6,558 6,562 Total $ 304 $ 303 $ 8,471 $ 8,494 (a) Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Gross gains and losses on sales of AFS securities for the three and nine months ended September 30, 2021 and 2020 were insignificant. Cash proceeds from sales of AFS securities were $35 million and $68 million for the three and nine months ended September 30, 2021, respectively. Cash proceeds from sales of AFS securities for the three and nine months ended September 30, 2020 were $240 million and $249 million, respectively. The following tables provide information on investments within the available-for-sale portfolio that had unrealized losses as of September 30, 2021 and December 31, 2020: As of September 30, 2021 Less than 12 months 12 months or longer Total (Dollars in millions) Fair Unrealized Fair Unrealized Fair Unrealized Government agency issued MBS $ 2,101 $ (33) $ 99 $ (4) $ 2,200 $ (37) Government agency issued CMO 1,243 (25) 179 (6) 1,422 (31) Other U.S. government agencies 495 (12) — — 495 (12) States and municipalities 107 (1) — — 107 (1) Total $ 3,946 $ (71) $ 278 $ (10) $ 4,224 $ (81) As of December 31, 2020 Less than 12 months 12 months or longer Total (Dollars in millions) Fair Unrealized Fair Unrealized Fair Unrealized U.S. treasuries $ 307 $ — $ — $ — $ 307 $ — Government agency issued MBS 426 (2) — — 426 (2) Government agency issued CMO 586 (3) — — 586 (3) Other U.S. government agencies 80 (1) — — 80 (1) States and municipalities 1 — — — 1 — Total $ 1,400 $ (6) $ — $ — $ 1,400 $ (6) FHN has evaluated all AFS debt securities that were in unrealized loss positions in accordance with its accounting policy for recognition of credit losses. No AFS debt securities were determined to have credit losses because the primary cause of the decline in value was attributable to changes in interest rates. Total AIR not included in the fair value or amortized cost basis of AFS debt securities was $23 million and $22 million as of September 30, 2021 and December 31, 2020, respectively. Consistent with FHN's review of the related securities, there were no credit-related write downs of AIR for AFS debt securities during the reporting period. Additionally, for AFS debt securities with unrealized losses, FHN does not intend to sell them and it is more-likely-than-not that FHN will not be required to sell them prior to recovery. Therefore, no write downs of these investments to fair value occurred during the reporting period. For HTM securities, an allowance for credit losses is required to absorb estimated lifetime credit losses. FHN has assessed the risk of credit loss and has determined that no allowance for credit losses for HTM securities was necessary as of September 30, 2021 and December 31, 2020. The carrying amount of equity investments without a readily determinable fair value was $73 million and $57 million at September 30, 2021 and December 31, 2020, respectively. The year-to-date 2021 and 2020 gross amounts of upward and downward valuation adjustments were not significant. Unrealized gains of $1 million were recognized in the three months ended September 30, 2021 and 2020. Unrealized gains of $7 million were recognized for the nine months ended September 30, 2021, and unrealized losses of $4 million were recognized for the nine months ended September 30, 2020, respectively, for equity investments with readily determinable fair values.

Loans and Leases

Loans and Leases	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Loans and Leases	Loans and Leases The loans and lease portfolio is disaggregated into portfolio segments and then further disaggregated into classes for certain disclosures. GAAP defines a portfolio segment as the level at which an entity develops and documents a systematic method for determining its allowance for credit losses. A class is generally a disaggregation of a portfolio segment and is generally determined based on risk characteristics of the loan and FHN’s method for monitoring and assessing credit risk and performance. FHN's loan and lease portfolio segments are commercial and consumer. The classes of loans and leases are: (1) commercial, financial, and industrial, which includes commercial and industrial loans and leases and loans to mortgage companies, (2) commercial real estate, (3) consumer real estate, which includes both real estate installment and home equity lines of credit, and (4) credit card and other. The following table provides the amortized cost basis of loans and leases by portfolio segment and class as of September 30, 2021 and December 31, 2020, excluding accrued interest of $143 million and $180 million, respectively, which is included in other assets in the Consolidated Balance Sheets. (Dollars in millions) September 30, 2021 December 31, 2020 Commercial: Commercial and industrial (a) (b) $ 26,377 $ 27,700 Loans to mortgage companies 5,139 5,404 Total commercial, financial, and industrial 31,516 33,104 Commercial real estate 12,194 12,275 Consumer: HELOC 2,041 2,420 Real estate installment loans 8,746 9,305 Total consumer real estate 10,787 11,725 Credit card and other 938 1,128 Loans and leases $ 55,435 $ 58,232 Allowance for loan and lease losses (734) (963) Net loans and leases $ 54,701 $ 57,269 (a) Includes equipment financing leases of $719 million and $587 million, respectively, as of September 30, 2021 and December 31, 2020. (b) Includes PPP loans fully guaranteed by the SBA of $2.0 billion and $4.1 billion as of September 30, 2021 and December 31, 2020, respectively. Restrictions Loans and leases with carrying values of $37.4 billion and $38.6 billion were pledged as collateral for borrowings at September 30, 2021 and December 31, 2020, respectively. Concentrations of Credit Risk Most of FHN’s business activity is with clients located in the southern United States. FHN’s lending activity is concentrated in its market areas within those states. As of September 30, 2021, FHN had loans to mortgage companies of $5.1 billion and loans to finance and insurance companies of $3.2 billion. As a result, 26% of the C&I portfolio is sensitive to impacts on the financial services industry. Credit Quality Indicators FHN employs a dual grade commercial risk grading methodology to assign an estimate for the probability of default and the loss given default for each commercial loan using factors specific to various industry, portfolio, or product segments that result in a rank ordering of risk and the assignment of grades PD 1 to PD 16. This credit grading system is intended to identify and measure the credit quality of the loan and lease portfolio by analyzing the migration between grading categories. It is also integral to the estimation methodology utilized in determining the ALLL since an allowance is established for pools of commercial loans based on the credit grade assigned. Each PD grade corresponds to an estimated one-year default probability percentage. PD grades are continually evaluated but require a formal scorecard annually. As a response to the COVID-19 pandemic, FHN identified a segment of its commercial portfolio that requires a quarterly re-grading process. As borrowers recover, they can be removed from the quarterly re-grading process with credit officer concurrence. PD 1 through PD 12 are “pass” grades. PD grades 13-16 correspond to the regulatory-defined categories of special mention (13), substandard (14), doubtful (15), and loss (16). Special mention loans and leases have potential weaknesses that, if left uncorrected, may result in deterioration of FHN's credit position at some future date. Substandard commercial loans and leases have well-defined weaknesses and are characterized by the distinct possibility that FHN will sustain some loss if the deficiencies are not corrected. Doubtful commercial loans and leases have the same weaknesses as substandard loans and leases with the added characteristics that the probability of loss is high and collection of the full amount is improbable. The following tables provide the amortized cost basis of the commercial loan portfolio by year of origination and credit quality indicator as of September 30, 2021 and December 31, 2020: September 30, 2021 C&I (Dollars in millions) 2021 2020 2019 2018 2017 Prior to 2017 LMC (a) Revolving Revolving Total Credit Quality Indicator: Pass (PD grades 1 through 12) (c) $ 5,822 $ 4,208 $ 3,809 $ 1,682 $ 1,294 $ 2,551 $ 5,139 $ 5,972 $ 13 $ 30,490 Special Mention (PD grade 13) 20 37 74 59 38 48 — 154 4 434 Substandard, Doubtful, or Loss (PD grades 14,15, and 16) 41 111 74 106 30 53 — 129 48 592 Total C&I loans $ 5,883 $ 4,356 $ 3,957 $ 1,847 $ 1,362 $ 2,652 $ 5,139 $ 6,255 $ 65 $ 31,516 (a) LMC includes non-revolving commercial lines of credit to qualified mortgage companies primarily for the temporary warehousing of eligible mortgage loans prior to the borrower's sale of those mortgage loans to third party investors. The loans are of short duration with maturities less than one year. (b) C&I loans converted from revolving to term in 2021 were not material. (c) 2021 and 2020 balances include PPP loans. December 31, 2020 C&I (Dollars in millions) 2020 2019 2018 2017 2016 Prior to 2016 LMC (a) Revolving Revolving Total Credit Quality Indicator: Pass (PD grades 1 through 12) (c) $ 9,060 $ 5,138 $ 2,628 $ 1,748 $ 1,161 $ 2,145 $ 5,404 $ 4,571 $ 60 $ 31,915 Special Mention (PD grade 13) 89 93 70 31 37 64 — 127 1 512 Substandard, Doubtful, or Loss (PD grades 14,15, and 16) 182 77 114 50 42 58 — 95 59 677 Total C&I loans $ 9,331 $ 5,308 $ 2,812 $ 1,829 $ 1,240 $ 2,267 $ 5,404 $ 4,793 $ 120 $ 33,104 (a) LMC includes non-revolving commercial lines of credit to qualified mortgage companies primarily for the temporary warehousing of eligible mortgage loans prior to the borrower's sale of those mortgage loans to third party investors. The loans are of short duration with maturities less than one year. (b) $50 million of C&I loans were converted from revolving to term in 2020. (c) 2020 balances include PPP loans. September 30, 2021 CRE (Dollars in millions) 2021 2020 2019 2018 2017 Prior to 2017 Revolving Revolving Loans Converted to Term Loans Total Credit Quality Indicator: Pass (PD grades 1 through 12) $ 2,216 $ 2,264 $ 2,814 $ 1,208 $ 806 $ 2,054 $ 259 $ — $ 11,621 Special Mention (PD grade 13) 4 26 50 171 69 91 — — 411 Substandard, Doubtful, or Loss (PD grades 14,15, and 16) 10 17 12 16 38 44 25 — 162 Total CRE loans $ 2,230 $ 2,307 $ 2,876 $ 1,395 $ 913 $ 2,189 $ 284 $ — $ 12,194 December 31, 2020 CRE (Dollars in millions) 2020 2019 2018 2017 2016 Prior to 2016 Revolving Revolving Loans Converted to Term Loans Total Credit Quality Indicator: Pass (PD grades 1 through 12) $ 2,477 $ 3,311 $ 1,750 $ 1,140 $ 946 $ 1,800 $ 259 $ 19 $ 11,702 Special Mention (PD grade 13) 48 24 117 75 71 54 — — 389 Substandard, Doubtful, or Loss (PD grades 14,15, and 16) 30 13 21 42 27 33 18 — 184 Total CRE loans $ 2,555 $ 3,348 $ 1,888 $ 1,257 $ 1,044 $ 1,887 $ 277 $ 19 $ 12,275 The consumer portfolio is comprised primarily of smaller-balance loans which are very similar in nature in that most are standard products and are backed by residential real estate. Because of the similarities of consumer loan-types, FHN is able to utilize the FICO score, among other attributes, to assess the credit quality of consumer borrowers. FICO scores are refreshed on a quarterly basis in an attempt to reflect the recent risk profile of the borrowers. Accruing delinquency amounts are indicators of asset quality within the credit card and other consumer portfolio. The following table reflects the amortized cost basis by year of origination and refreshed FICO scores for consumer real estate loans as of September 30, 2021 and December 31, 2020. Within consumer real estate, classes include HELOC and real estate installment. HELOCs are loans which during their draw period are classified as revolving loans. Once the draw period ends and the loan enters its repayment period, the loan converts to a term loan and is classified as a revolving loan converted to a term loan. All loans classified in the following tables as revolving loans or revolving loans converted to term loans are HELOCs. Real estate installment loans are originated as fixed term loans and are classified below in their vintage year. All loans in the following tables classified in a vintage year are real estate installment loans. September 30, 2021 Consumer Real Estate (Dollars in millions) 2021 2020 2019 2018 2017 Prior to 2017 Revolving Revolving Total FICO score 740 or greater $ 1,037 $ 1,085 $ 844 $ 500 $ 682 $ 1,692 $ 1,104 $ 130 $ 7,074 FICO score 720-739 135 143 111 78 107 119 164 24 881 FICO score 700-719 98 109 78 55 117 131 146 25 759 FICO score 660-699 99 137 101 97 148 147 215 48 992 FICO score 620-659 15 33 51 23 65 67 71 31 356 FICO score less than 620 226 52 30 41 193 100 48 35 725 Total $ 1,610 $ 1,559 $ 1,215 $ 794 $ 1,312 $ 2,256 $ 1,748 $ 293 $ 10,787 (a) $34 million of HELOC loans were converted from revolving to term in 2021. December 31, 2020 Consumer Real Estate (Dollars in millions) 2020 2019 2018 2017 2016 Prior to 2016 Revolving Revolving Loans Converted to Term Loans Total FICO score 740 or greater $ 1,186 $ 1,167 $ 703 $ 610 $ 674 $ 1,719 $ 1,275 $ 159 $ 7,493 FICO score 720-739 157 158 100 77 92 197 186 29 996 FICO score 700-719 122 107 78 76 73 221 177 34 888 FICO score 660-699 130 141 123 75 85 296 264 59 1,173 FICO score 620-659 45 61 37 28 35 127 92 36 461 FICO score less than 620 107 36 52 54 95 261 61 48 714 Total $ 1,747 $ 1,670 $ 1,093 $ 920 $ 1,054 $ 2,821 $ 2,055 $ 365 $ 11,725 The following tables reflect the amortized cost basis by year of origination and refreshed FICO scores for credit card and other loans as of September 30, 2021 and December 31, 2020. September 30, 2021 Credit Card and Other (Dollars in millions) 2021 2020 2019 2018 2017 Prior to 2017 Revolving Revolving Total FICO score 740 or greater $ 55 $ 38 $ 33 $ 27 $ 18 $ 70 $ 212 $ 5 $ 458 FICO score 720-739 9 6 5 4 4 20 39 2 89 FICO score 700-719 6 6 5 5 4 24 42 1 93 FICO score 660-699 22 7 6 7 6 33 93 2 176 FICO score 620-659 3 3 3 4 3 19 21 1 57 FICO score less than 620 12 5 3 5 4 18 16 2 65 Total $ 107 $ 65 $ 55 $ 52 $ 39 $ 184 $ 423 $ 13 $ 938 (a) $4 million of other consumer loans were converted from revolving to term in 2021. December 31, 2020 Credit Card and Other (Dollars in millions) 2020 2019 2018 2017 2016 Prior to 2016 Revolving Revolving Loans Converted to Term Loans Total FICO score 740 or greater $ 57 $ 52 $ 59 $ 37 $ 23 $ 116 $ 159 $ 5 $ 508 FICO score 720-739 7 7 9 8 8 27 91 2 159 FICO score 700-719 9 8 9 8 4 38 37 3 116 FICO score 660-699 30 12 15 9 9 48 46 3 172 FICO score 620-659 5 5 7 5 10 24 20 1 77 FICO score less than 620 14 7 8 11 9 26 20 1 96 Total $ 122 $ 91 $ 107 $ 78 $ 63 $ 279 $ 373 $ 15 $ 1,128 Nonaccrual and Past Due Loans and Leases Loans and leases are placed on nonaccrual if it becomes evident that full collection of principal and interest is at risk, impairment has been recognized as a partial charge-off of principal balance due to insufficient collateral value and past due status, or on a case-by-case basis if FHN continues to receive payments but there are other borrower-specific issues. Included in nonaccrual are loans for which FHN continues to receive payments including residential real estate loans where the borrower has been discharged of personal obligation through bankruptcy. Past due loans are loans contractually past due as to interest or principal payments, but which have not yet been put on nonaccrual status. In accordance with revised Interagency Guidance issued in 2020, FHN is not required to designate loans with deferrals granted in response to COVID-19 as past due because of such deferrals. If a borrower defers payment, this may result in no contractual payments being past due, and as such, loans would not be considered past due during the period of deferral, and as a result, are excluded from loans past due 30-89 days and loans 90+ days past due in the tables below. The following table reflects accruing and non-accruing loans and leases by class on September 30, 2021 and December 31, 2020: September 30, 2021 Accruing Non-Accruing (Dollars in millions) Current 30-89 90+ Total Current 30-89 90+ Total Total Commercial, financial, and industrial: C&I (a) $ 26,196 $ 36 $ 1 $ 26,233 $ 119 $ 9 $ 16 $ 144 $ 26,377 Loans to mortgage companies 5,139 — — 5,139 — — — — 5,139 Total commercial, financial, and industrial 31,335 36 1 31,372 119 9 16 144 31,516 Commercial real estate: CRE (b) 12,120 15 1 12,136 8 — 50 58 12,194 Consumer real estate: HELOC (c) 1,979 5 7 1,991 37 2 11 50 2,041 Real estate installment loans (d) 8,625 23 5 8,653 51 4 38 93 8,746 Total consumer real estate 10,604 28 12 10,644 88 6 49 143 10,787 Credit card and other: Credit card 274 3 2 279 — — — — 279 Other 656 1 — 657 — 1 1 2 659 Total credit card and other 930 4 2 936 — 1 1 2 938 Total loans and leases $ 54,989 $ 83 $ 16 $ 55,088 $ 215 $ 16 $ 116 $ 347 $ 55,435 (a) $129 million of C&I loans are nonaccrual loans that have been specifically reviewed for impairment with no related allowance. (b) $52 million of CRE loans are nonaccrual loans that have been specifically reviewed for impairment with no related allowance. (c) $7 million of HELOC loans are nonaccrual loans that have been specifically reviewed for impairment with no related allowance. (d) $52 million of real estate installment loans are nonaccrual loans that have been specifically reviewed for impairment with no related allowance. December 31, 2020 Accruing Non-Accruing (Dollars in millions) Current 30-89 90+ Total Current 30-89 90+ Total Total Commercial, financial, and industrial: C&I (a) $ 27,541 $ 15 $ — $ 27,556 $ 88 $ 12 $ 44 $ 144 $ 27,700 Loans to mortgage companies 5,404 — — 5,404 — — — — 5,404 Total commercial, financial, and industrial 32,945 15 — 32,960 88 12 44 144 33,104 Commercial real estate: CRE 12,194 23 — 12,217 10 42 6 58 12,275 Consumer real estate: HELOC 2,336 13 11 2,360 43 3 14 60 2,420 Real estate installment loans 9,138 40 5 9,183 63 9 50 122 9,305 Total consumer real estate 11,474 53 16 11,543 106 12 64 182 11,725 Credit card and other: Credit card 279 3 1 283 — — — — 283 Other 838 6 — 844 1 — 1 2 845 Total credit card and other 1,117 9 1 1,127 1 — 1 2 1,128 Total loans and leases, net of unearned income $ 57,730 $ 100 $ 17 $ 57,847 $ 205 $ 66 $ 115 $ 386 $ 58,232 (a) $101 million of C&I loans are nonaccrual loans that have been specifically reviewed for impairment with no related allowance. Collateral-Dependent Loans Collateral-dependent loans are defined as loans for which repayment is expected to be derived substantially through the operation or sale of the collateral and where the borrower is experiencing financial difficulty. At a minimum, the estimated value of the collateral for each loan equals the current book value. As of September 30, 2021 and December 31, 2020 , FHN had commercial loans with amortized cost of appro ximately $174 million and $167 million, respectively, that were based on the value of underlying collateral. Collateral-dependent C&I and CRE loans totaled $161 million and $13 million, respectively, at September 30, 2021. The collateral for these loans generally consists of business assets including land, buildings, equipment and financial assets. During the three and nine months ended September 30, 2021, FHN recognized charge-offs of approximately $9 million and $25 million, respectively, on these loans related to reductions in estimated collateral values. Consumer HELOC and real estate installment loa ns with amortized cost based on the va lue of underlying real estate collateral were approximately $8 million and $21 million, respectively, as of September 30, 2021, and $9 million and $26 million, respectively, as of December 31, 2020. Charge-offs during the three and nine months ended September 30, 2021 were not significant for collateral-dependent consumer loans. Troubled Debt Restructurings As part of FHN’s ongoing risk management practices, FHN attempts to work with borrowers when necessary to extend or modify loan terms to better align with their current ability to repay. Extensions and modifications to loans are made in accordance with internal policies and guidelines which conform to regulatory guidance. Each occurrence is unique to the borrower and is evaluated separately. A modification is classified as a TDR if the borrower is experiencing financial difficulty and it is determined that FHN has granted a concession to the borrower. FHN may determine that a borrower is experiencing financial difficulty if the borrower is currently in default on any of its debt, or if it is probable that a borrower may default in the foreseeable future. Many aspects of a borrower’s financial situation are assessed when determining whether they are experiencing financial difficulty. Concessions could include extension of the maturity date, reductions of the interest rate (which may make the rate lower than current market for a new loan with similar risk), reduction or forgiveness of accrued interest, or principal forgiveness. The assessments of whether a borrower is experiencing (or is likely to experience) financial difficulty, and whether a concession has been granted, are subjective in nature and management’s judgment is required when determining whether a modification is classified as a TDR. In accordance with regulatory guidance, certain loan modifications that might ordinarily have qualified as TDRs were not accounted for as TDRs and have been excluded from the disclosures below. For loan modifications that were made during the three and nine months ended September 30, 2021 or the year ended December 31, 2020 that met the TDR relief provisions outlined in either the CARES Act, as extended by the CAA, or revised Interagency Guidance, FHN has excluded these modifications from consideration as TDRs, and has excluded loans with these qualifying modifications from designation as TDRs in the information and discussion that follows. On September 30, 2021 and December 31, 2020, FHN had $239 million and $307 million of portfolio loans classified as TDRs, respectively. Additionally, $37 million and $42 million of loans held for sale as of September 30, 2021 and December 31, 2020, respectively, were classified as TDRs. The following tables present the end of period balance for loans modified in a TDR during the periods indicated: Three Months Ended September 30, 2021 Three Months Ended September 30, 2020 (Dollars in millions) Number Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment C&I 5 $ 8 $ 7 83 $ 130 $ 120 CRE — — — 14 12 12 HELOC 2 — — 35 3 2 Real estate installment loans 6 — — 44 6 6 Credit card and other 8 — — 10 — — Total TDRs 21 $ 8 $ 7 186 $ 151 $ 140 Nine Months Ended September 30, 2021 Nine Months Ended September 30, 2020 (Dollars in millions) Number Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment C&I 32 $ 37 $ 34 87 $ 141 $ 129 CRE 1 12 10 14 12 12 HELOC 21 2 2 47 4 4 Real estate installment loans 41 8 8 94 15 15 Credit card and other 36 — — 50 — — Total TDRs 131 $ 59 $ 54 292 $ 172 $ 160 The following tables present TDRs which re-defaulted during the three and nine months ended September 30, 2021 and 2020, a nd as to which the modification occurred 12 months or less prior to the re-default. For purposes of this disclosure, FHN generally defines payment default as 30 or more days past due. Three Months Ended September 30, 2021 Three Months Ended September 30, 2020 (Dollars in millions) Number Recorded Number Recorded C&I 6 $ 3 — $ — CRE 4 10 — — HELOC — — 1 — Real estate installment loans 1 1 6 1 Credit card and other 1 — 7 — Total TDRs 12 $ 14 14 $ 1 Nine Months Ended September 30, 2021 Nine Months Ended September 30, 2020 (Dollars in millions) Number Recorded Number Recorded C&I 18 $ 5 — $ — CRE 6 19 — — HELOC 1 — 8 — Real estate installment loans 8 4 16 1 Credit card and other 2 — 21 — Total TDRs 35 $ 28 45 $ 1

Allowance for Credit Losses

Allowance for Credit Losses	9 Months Ended
	Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Allowance for Credit Losses	Allowance for Credit Losses Management's estimate of expected credit losses in the loan and lease portfolios is recorded in the ALLL and the RULC, collectively the ACL. The ALLL and the RULC are reported on the Consolidated Balance Sheets in the allowance for loan and lease losses and in other liabilities, respectively. Provision for credit losses related to the loans and leases portfolio and the unfunded lending commitments are reported in the Consolidated Statements of Income as provision for credit losses. The ACL is maintained at a level management believes to be appropriate to absorb expected lifetime credit losses over the contractual life of the loan and lease portfolio and unfunded lending commitments. The determination of the ACL is based on periodic evaluation of the loan and lease portfolios and unfunded lending commitments considering a number of relevant underlying factors, including key assumptions and evaluation of quantitative and qualitative information. In accordance with its accounting policy elections, FHN does not recognize a separate allowance for expected credit losses for AIR and records reversals of AIR as reductions of interest income. FHN reverses previously accrued but uncollected interest when an asset is placed on nonaccrual status. As of September 30, 2021 and December 31, 2020, FHN recognized approximately $1 million in allowance for expected credit losses on COVID-19 deferrals that do not qualify for the election which is not reflected in the table below. AIR and the related allowance for expected credit losses is included as a component of other assets. The total amount of interest reversals from loans placed on nonaccrual status and the amount of income recognized on nonaccrual loans during the three and nine months ended September 30, 2021 and 2020 were not material. Expected credit losses for unfunded commitments are estimated for periods where the commitment is not unconditionally cancellable. The measurement of expected credit losses for unfunded commitments mirrors that of loans and leases with the additional estimate of future draw rates (timing and amount). The decrease in the ACL as of September 30, 2021 as compared to December 31, 2020 reflects an improvement in the macroeconomic outlook, positive grade migration, and lower loan balances. In developing credit loss estimates for its loan and lease portfolios, FHN utilized multiple Moody’s scenarios for its macroeconomic inputs. Each scenario included assumptions around the COVID-19 pandemic and its impact on various sections of the economy. The heaviest weight was placed on the baseline forecast, which assumed positive real GDP growth over the forecast horizon and return to full employment by year-end 2022. As there can be no certainty that actual economic performance will precisely follow any specific macroeconomic forecast, FHN also evaluated other macroeconomic forecasts provided by Moody’s and adjusted the modeled outputs through a qualitative adjustment to account for uncertainties inherent in the macroeconomic forecast process. During the year ended December 31, 2020 and the nine months ended September 30, 2021, FHN also considered stressed loan portfolios or industries that are most exposed to the effects of the COVID-19 pandemic and added qualitative adjustments, where needed, to account for the risks not captured in modeled results. Management also made qualitative adjustments to reflect estimated recoveries based on a review of prior charge off and recovery levels, for default risk associated with large balances with individual borrowers, for estimated loss amounts not reflected in historical factors due to specific portfolio risk, and for instances where limited data for acquired loans is considered to affect modeled results. The following table provides a rollforward of the ALLL and RULC by portfolio type for the three and nine months ended September 30, 2021 and 2020: (Dollars in millions) Commercial, Financial, and Industrial (a) Commercial Real Estate Consumer Real Estate Credit Card and Other Total Allowance for loan and lease losses: Balance as of July 1, 2021 $ 385 $ 210 $ 203 $ 17 $ 815 Charge-offs (11) (2) (1) (5) (19) Recoveries 7 2 7 — 16 Provision for loan and lease losses (7) (48) (30) 7 (78) Balance as of September 30, 2021 $ 374 $ 162 $ 179 $ 19 $ 734 Balance as of July 1, 2020 $ 319 $ 57 $ 144 $ 18 $ 538 Initial allowance on loans purchased with credit deterioration 138 100 44 5 287 Charge-offs (69) (4) (2) (3) (78) Recoveries 3 2 5 1 11 Provision for loan losses 98 53 74 5 230 Balance as of September 30, 2020 $ 489 $ 208 $ 265 $ 26 $ 988 Reserve for remaining unfunded commitments: Balance as of July 1, 2021 $ 57 $ 9 $ 9 $ — $ 75 Provision for remaining unfunded commitments (8) 1 — — (7) Balance as of September 30, 2021 $ 49 $ 10 $ 9 $ — $ 68 Balance as of July 1, 2020 $ 37 $ 6 $ 8 $ — $ 51 Initial reserve on loans acquired 12 26 3 — 41 Provision for remaining unfunded commitments (2) (1) — — (3) Balance as of September 30, 2020 $ 47 $ 31 $ 11 $ — $ 89 Allowance for loan and lease losses: Balance as of January 1, 2021 $ 453 $ 242 $ 242 $ 26 $ 963 Charge-offs (27) (5) (5) (11) (48) Recoveries 18 5 21 3 47 Provision for loan and lease losses (70) (80) (79) 1 (228) Balance as of September 30, 2021 $ 374 $ 162 $ 179 $ 19 $ 734 Balance as of January 1, 2020, as adjusted (b) $ 142 $ 29 $ 121 $ 15 $ 307 Initial allowance on loans purchased with credit deterioration 138 100 44 5 287 Charge-offs (95) (4) (6) (10) (115) Recoveries 5 3 13 3 24 Provision for loan and lease losses 299 80 93 13 485 Balance as of September 30, 2020 $ 489 $ 208 $ 265 $ 26 $ 988 Reserve for remaining unfunded commitments: Balance as of January 1, 2021 $ 65 $ 10 $ 10 $ — $ 85 Provision for remaining unfunded commitments (16) — (1) — (17) Balance as of September 30, 2021 $ 49 $ 10 $ 9 $ — $ 68 Balance as of January 1, 2020, as adjusted (b) $ 21 $ 4 $ 6 $ — $ 31 Initial reserve on loans acquired 12 26 3 — 41 Provision for remaining unfunded commitments 14 1 2 — 17 Balance as of September 30, 2020 $ 47 $ 31 $ 11 $ — $ 89 (a) C&I loans as of September 30, 2021 include $2.0 billion in PPP loans which due to the government guarantee and forgiveness provisions are considered to have no credit risk and therefore have no allowance for loan and lease losses.

Mortgage Banking Activity

Mortgage Banking Activity	9 Months Ended
	Sep. 30, 2021
Mortgage Banking [Abstract]
Mortgage Banking Activity	Mortgage Banking Activity On July 1, 2020, as part of the IBKC merger, FHN obtained IBKC's mortgage banking operations which includes origination and servicing of residential first lien mortgages that conform to standards established by GSEs that are major investors in U.S. home mortgages but can also consist of junior lien and jumbo loans secured by residential property. These loans are primarily sold to private companies that are unaffiliated with the GSEs on a servicing-released basis. Gains and losses on these mortgage loans are included in mortgage banking and title income on the Consolidated Statements of Income. Prior to the merger, FHN’s mortgage banking operations were not significant. At September 30, 2021, FHN had approximately $48 million of loans that remained from pre-2009 Mortgage Business operations. Activity related to the pre-2009 mortgage loans was primarily limited to payments and write-offs in 2020 and 2021, with no new originations or loan sales, and only an insignificant amount of repurchases. These loans are excluded from the disclosure below. The following table summarizes activity relating to residential mortgage loans held for sale as of the nine months ended September 30, 2021 and the year ended December 31, 2020. (Dollars in millions) September 30, 2021 December 31, 2020 Balance at beginning of period $ 409 $ 4 Acquired — 320 Originations and purchases 2,154 2,499 Sales, net of gains (2,302) (2,405) Mortgage loans transferred from (to) held for investment 30 (9) Balance at end of period $ 291 $ 409 Mortgage Servicing Rights Effective with the IBKC merger, FHN made an election to record mortgage servicing rights at the lower of cost or market value and amortize over the remaining servicing life of the loans, with consideration given to prepayment assumptions. Mortgage servicing rights are included in other assets on the Consolidated Balance Sheets. Mortgage servicing rights had the following carrying values as of the periods indicated. September 30, 2021 December 31, 2020 (Dollars in millions) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Mortgage servicing rights $ 36 $ (7) $ 29 $ 28 $ (3) $ 25 In addition, there was an insignificant amount of non-mortgage and commercial servicing rights as of September 30, 2021 and December 31, 2020. Total mortgage servicing fees included in mortgage banking and title income were $1 million for the three months ended September 30, 2021 and $2 million for the nine months ended September 30, 2021. Total mortgage servicing fees included in mortgage banking and title income were $1 million for the three and nine months ended September 30, 2020.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill On July 1, 2020, FHN completed its merger-of-equals transaction with IBKC. In connection with the merger, FHN recorded a $531 million purchase accounting gain, based on fair value estimates. On July 17, 2020, FHN completed its purchase of 30 branches from Truist Bank. In relation to the acquisition, FHN recorded $78 million in goodwill, based on fair value estimates. See Note 2 - Acquisitions and Divestitures for additional information regarding these transactions. FHN performed the required annual goodwill impairment test as of October 1, 2020. The annual impairment test did not indicate impairment in any of FHN’s reporting units as of the testing date. Following the testing date, management evaluated the events and circumstances that could indicate that goodwill might be impaired and concluded that a subsequent interim test was not necessary. FHN is currently in the process of performing its annual impairment test as of October 1, 2021. As further discussed in Note 13 - Business Segment Information, FHN reorganized its management reporting structure during 2020 and, accordingly, its segment reporting structure and goodwill reporting units. In connection with the reorganization, management reallocated goodwill to the new reporting units using a relative fair value approach. Accounting estimates and assumptions were made about FHN’s future performance and cash flows, as well as other prevailing market factors (e.g., interest rates, economic trends, etc.) when determining fair value as part of the goodwill impairment test. While management used the best information available to estimate future performance for each reporting unit, future adjustments to management’s projections may be necessary if conditions differ substantially from the assumptions used in making the estimates. The following is a summary of goodwill by reportable segment included in the Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020. (Dollars in millions) Regional Specialty Banking Total December 31, 2019 $ 802 $ 631 $ 1,433 Additions 78 — 78 December 31, 2020 $ 880 $ 631 $ 1,511 Additions and adjustments — — — September 30, 2021 $ 880 $ 631 $ 1,511 Other intangible assets The following table, which excludes fully amortized intangibles, presents other intangible assets included in the Consolidated Balance Sheets: September 30, 2021 December 31, 2020 (Dollars in millions) Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Core deposit intangibles $ 371 $ (117) $ 254 $ 371 $ (81) $ 290 Customer relationships 37 (10) 27 37 (8) 29 Other (a) 41 (11) 30 41 (6) 35 Total $ 449 $ (138) $ 311 $ 449 $ (95) $ 354 (a) Includes noncompete covenants and purchased credit card intangible assets. Also includes title plant intangible assets and state banking licenses which are not subject to amortization.

Preferred Stock

Preferred Stock	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Preferred Stock	Preferred Stock The following table presents a summary of FHN's non-cumulative perpetual preferred stock: (Dollars in millions) September 30, 2021 December 31, 2020 Issuance Date Earliest Redemption Date (a) Annual Dividend Rate Dividend Payments Shares Outstanding Liquidation Amount Carrying Amount Carrying Amount Series A 1/31/2013 4/10/2018 6.200 % Quarterly — $ — $ — $ 95 Series B 7/2/2020 8/1/2025 6.625 % (b) Semi-annually 8,000 80 77 77 Series C 7/2/2020 5/1/2026 6.600 % (c) Quarterly 5,750 58 59 59 Series D 7/2/2020 5/1/2024 6.100 % (d) Semi-annually 10,000 100 94 94 Series E 5/28/2020 10/10/2025 6.500 % Quarterly 1,500 150 145 145 Series F 5/3/2021 7/10/2026 4.700 % Quarterly 1,500 150 145 — 26,750 $ 538 $ 520 $ 470 (a) Denotes earliest optional redemption date. Earlier redemption is possible, at FHN's election, if certain regulatory capital events occur. (b) Fixed dividend rate will reset on August 1, 2025 to three-month LIBOR plus 4.262%. (c) Fixed dividend rate will reset on May 1, 2026 to three-month LIBOR plus 4.920%. (d) Fixed dividend rate will reset on May 1, 2024 to three-month LIBOR plus 3.859%. During the second quarter of 2021, FHN issued $150 million of 4.70% Series F Non-Cumulative Perpetual Preferred Stock (the Series F Preferred Stock). The Series F Preferred Stock is redeemable at FHN's option, in whole or in part, on or after July 10, 2026. Earlier redemption is possible, at FHN's election, if certain regulatory capital events occur. The $145 million carrying value of the Series F Preferred Stock currently qualifies as Tier 1 Capital. During the third quarter of 2021, FHN redeemed all outstanding shares of Series A Preferred Stock. The difference between the $100 million liquidation preference and the carrying value of the Series A Preferred Stock resulted in a $5 million deemed dividend that was included in EPS for the nine months ended September 30, 2021. Subsidiary Preferred Stock First Horizon Bank has issued 300,000 shares of Class A Non-Cumulative Perpetual Preferred Stock (Class A Preferred Stock) with a liquidation preference of $1,000 per share. Dividends on the Class A Preferred Stock, if declared, accrue and are payable each quarter, in arrears, at a floating rate equal to the greater of the three month LIBOR plus 0.85% or 3.75% per annum. These securities qualify fully as Tier 1 capital for both First Horizon Bank and FHN. On September 30, 2021 and December 31, 2020, $295 million of Class A Preferred Stock was recognized as noncontrolling interest on the Consolidated Balance Sheets.

Components of Other Comprehensi

Components of Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2021
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Components of Other Comprehensive Income (Loss)	Components of Other Comprehensive Income (Loss) The following table provides the changes in accumulated other comprehensive income (loss) by component, net of tax, for the three and nine months ended September 30, 2021 and 2020: (Dollars in millions) Securities AFS Cash Flow Pension and Total Balance as of July 1, 2021 $ 43 $ 8 $ (254) $ (203) Net unrealized gains (losses) (38) — (3) (41) Amounts reclassified from AOCI — (1) 4 3 Other comprehensive income (loss) (38) (1) 1 (38) Balance as of September 30, 2021 $ 5 $ 7 $ (253) $ (241) (Dollars in millions) Securities AFS Cash Flow Pension and Total Balance as of January 1, 2021 $ 108 $ 12 $ (260) $ (140) Net unrealized gains (losses) (103) (1) (4) (108) Amounts reclassified from AOCI — (4) 11 7 Other comprehensive income (loss) (103) (5) 7 (101) Balance as of September 30, 2021 $ 5 $ 7 $ (253) $ (241) (Dollars in millions) Securities AFS Cash Flow Hedges Pension and Post-retirement Plans Total Balance as of July 1, 2020 $ 118 $ 16 $ (268) $ (134) Net unrealized gains (losses) (6) (1) — (7) Amounts reclassified from AOCI 1 (2) 2 1 Other comprehensive income (loss) (5) (3) 2 (6) Balance as of September 30, 2020 $ 113 $ 13 $ (266) $ (140) (Dollars in millions) Securities AFS Cash Flow Hedges Pension and Post-retirement Plans Total Balance as of January 1, 2020 $ 31 $ 3 $ (273) $ (239) Net unrealized gains (losses) 81 14 — 95 Amounts reclassified from AOCI 1 (4) 7 4 Other comprehensive income (loss) 82 10 7 99 Balance as of September 30, 2020 $ 113 $ 13 $ (266) $ (140) Reclassifications from AOCI, and related tax effects, were as follows: (Dollars in millions) Three Months Ended Nine Months Ended Details about AOCI 2021 2020 2021 2020 Affected line item in the statement where net Securities AFS: Realized (gains) losses on securities AFS $ — $ 1 $ — $ 1 Securities gains (losses), net Tax expense (benefit) — — — — Income tax expense — 1 — 1 Cash Flow Hedges: Realized (gains) losses on cash flow hedges $ (2) $ (2) $ (6) $ (5) Interest and fees on loans and leases Tax expense (benefit) 1 — 2 1 Income tax expense (1) (2) (4) (4) Pension and Postretirement Plans: Amortization of prior service cost and net actuarial gain (loss) 3 3 9 9 Other expense Tax expense (benefit) 1 (1) 2 (2) Income tax expense 4 2 11 7 Total reclassification from AOCI $ 3 $ 1 $ 7 $ 4

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The computations of basic and diluted earnings per common share were as follows: Three Months Ended Nine Months Ended (Dollars in millions, except per share data; shares in thousands) 2021 2020 2021 2020 Net income $ 235 $ 539 $ 781 $ 612 Net income attributable to noncontrolling interest 3 3 9 8 Net income attributable to controlling interest 232 536 772 604 Preferred stock dividends 8 13 29 16 Net income available to common shareholders $ 224 $ 523 $ 743 $ 588 Weighted average common shares outstanding—basic 545,818 549,690 549,434 391,699 Effect of dilutive securities 4,001 1,156 4,765 1,014 Weighted average common shares outstanding—diluted 549,819 550,846 554,199 392,713 Basic earnings per common share $ 0.41 $ 0.95 $ 1.35 $ 1.50 Diluted earnings per common share $ 0.41 $ 0.95 $ 1.34 $ 1.50 The following table presents average outstanding options and other equity awards that were excluded from the calculation of diluted earnings per share because they were either anti-dilutive (the exercise price was higher than the weighted-average market price for the period) or the performance conditions have not been met: Three Months Ended Nine Months Ended (Shares in thousands) 2021 2020 2021 2020 Stock options excluded from the calculation of diluted EPS 2,901 8,306 1,431 4,564 Weighted average exercise price of stock options excluded from the calculation of diluted EPS $ 17.75 $ 15.32 $ 20.64 $ 17.05 Other equity awards excluded from the calculation of diluted EPS 2,464 6,824 1,394 4,826

Contingencies And Other Disclos

Contingencies And Other Disclosures	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Contingencies and Other Disclosures	Contingencies and Other Disclosures CONTINGENCIES Contingent Liabilities Overview Contingent liabilities arise in the ordinary course of business. Often they are related to lawsuits, arbitration, mediation, and other forms of litigation. Various litigation matters currently are threatened or pending against FHN and its subsidiaries. Also, FHN at times receives requests for information, subpoenas, or other inquiries from federal, state, and local regulators, from other government authorities, and from other parties concerning various matters relating to FHN’s current or former businesses. Certain matters of that sort are pending at most times, and FHN generally cooperates when those matters arise. Pending and threatened litigation matters sometimes are settled by the parties, and sometimes pending matters are resolved in court or before an arbitrator, or are withdrawn. Regardless of the manner of resolution, frequently the most significant changes in status of a matter occur over a short time period, often following a lengthy period of little substantive activity. In view of the inherent difficulty of predicting the outcome of these matters, particularly where the claimants seek very large or indeterminate damages, or where the cases present novel legal theories or involve a large number of parties, or where claims or other actions may be possible but have not been brought, FHN cannot reasonably determine what the eventual outcome of the matters will be, what the timing of the ultimate resolution of these matters may be, or what the eventual loss or impact related to each matter may be. FHN establishes a loss contingency liability for a litigation matter when loss is both probable and reasonably estimable as prescribed by applicable financial accounting guidance. If loss for a matter is probable and a range of possible loss outcomes is the best estimate available, accounting guidance requires a liability to be established at the low end of the range. Based on current knowledge, and after consultation with counsel, management is of the opinion that loss contingencies related to threatened or pending litigation matters should not have a material adverse effect on the consolidated financial condition of FHN but may be material to FHN’s operating results for any particular reporting period depending, in part, on the results from that period. Material Loss Contingency Matters Summary As used in this Note, except for matters that are reported as having been substantially settled or otherwise substantially resolved, FHN's “material loss contingency matters” generally fall into at least one of the following categories: (i) FHN has determined material loss to be probable and has established a material loss liability in accordance with applicable financial accounting guidance; (ii) FHN has determined material loss to be probable but is not reasonably able to estimate an amount or range of material loss liability; or (iii) FHN has determined that material loss is not probable but is reasonably possible, and the amount or range of that reasonably possible material loss is estimable. As defined in applicable accounting guidance, loss is reasonably possible if there is more than a remote chance of a material loss outcome for FHN. FHN provides contingencies note disclosures for certain pending or threatened litigation matters each quarter, including all matters mentioned in categories (i) or (ii) and, occasionally, certain matters mentioned in category (iii). In addition, in this Note, certain other matters, or groups of matters, are discussed relating to FHN’s pre-2009 mortgage origination and servicing businesses. In all litigation matters discussed in this Note, unless settled or otherwise resolved, FHN believes it has meritorious defenses and intends to pursue those defenses vigorously. FHN reassesses the liability for litigation matters each quarter as the matters progress. At September 30, 2021, the aggregate amount of liabilities established for all such loss contingency matters was $1 million. These liabilities are separate from those discussed under the heading “Mortgage Loan Repurchase and Foreclosure Liability” below. In each material loss contingency matter, except as otherwise noted, there is more than a remote chance that any of the following outcomes will occur: the plaintiff will substantially prevail; the defense will substantially prevail; the plaintiff will prevail in part; or the matter will be settled by the parties. At September 30, 2021, FHN estimates that for all material loss contingency matters, estimable reasonably possible losses in future periods in excess of currently established liabilities could aggregate in a range from zero to $6 million. As a result of the general uncertainties discussed above and the specific uncertainties discussed for each matter mentioned below, it is possible that the ultimate future loss experienced by FHN for any particular matter may materially exceed the amount, if any, of currently established liability for that matter. Exposures from pre-2009 Mortgage Business FHN is contending with indemnification claims related to "other whole loans sold," which were mortgage loans originated by FHN before 2009 and sold outside of a securitization organized by FHN. These claims generally assert that FHN-originated loans contributed to losses in connection with mortgage loans securitized by the buyer of the loans. The claims generally do not include specific deficiencies for specific loans sold by FHN. Instead, the claims generally assert that FHN is liable for a share of the claimant's loss estimated by assessing the totality of the other whole loans sold by FHN to claimant in relation to the totality of the larger number of loans securitized by claimant. FHN is unable to estimate an RPL range for these matters due to significant uncertainties regarding: the number of, and the facts underlying, the loan originations which claimants assert are indemnifiable; the applicability of FHN’s contractual indemnity covenants to those facts and originations; and, in those cases where an indemnity claim may be supported, whether any legal defenses, counterclaims, other counter-positions, or third-party claims might eliminate or reduce claims against FHN or their impact on FHN. FHN also has indemnification claims related to servicing obligations. The most significant is from Nationstar Mortgage LLC, currently doing business as “Mr. Cooper.” Nationstar was the purchaser of FHN’s mortgage servicing obligations and assets in 2013 and 2014 and, was FHN’s subservicer. Nationstar asserts several categories of indemnity obligations in connection with mortgage loans under the subservicing arrangement and under the purchase transaction. This matter currently is not in litigation, but litigation in the future is possible. FHN is unable to estimate an RPL range for this matter due to significant uncertainties regarding: the exact nature of each of Nationstar’s claims and its position in respect of each; the number of, and the facts underlying, the claimed instances of indemnifiable events; the applicability of FHN’s contractual indemnity covenants to those facts and events; and, in those cases where the facts and events might support an indemnity claim, whether any legal defenses, counterclaims, other counter-positions, or third-party claims might eliminate or reduce claims against FHN or their impact on FHN. FHN has additional potential exposures related to its pre-2009 mortgage businesses. A few of those matters have become litigation which FHN currently estimates are immaterial, some are non-litigation claims or threats, some are mere subpoenas or other requests for information, and in some areas FHN has no indication of any active or threatened dispute. Some of those matters might eventually result in settlements, and some might eventually result in adverse litigation outcomes, but none are included in the material loss contingency liabilities mentioned above or in the RPL range mentioned above. Mortgage Loan Repurchase and Foreclosure Liability FHN’s repurchase and foreclosure liability, primarily related to its pre-2009 mortgage businesses, is comprised of accruals to cover estimated loss content in the active pipeline (consisting of mortgage loan repurchase, make-whole, foreclosure/servicing demands and certain related exposures), estimated future inflows, and estimated loss content related to certain known claims not currently included in the active pipeline. FHN compares the estimated probable incurred losses determined under the applicable loss estimation approaches for the respective periods with current reserve levels. Changes in the estimated required liability levels are recorded as necessary through the repurchase and foreclosure provision. Based on currently available information and experience to date, FHN has evaluated its loan repurchase, make-whole, foreclosure, and certain related exposures and has accrued for losses of $16 million as of both September 30, 2021 and December 31, 2020. Accrued liabilities for FHN’s estimate of these obligations are reflected in other liabilities on the Consolidated Balance Sheets. Charges/expense reversals to increase/decrease the liability are included within other income on the Consolidated Statements of Income. The estimates are based upon currently available information and fact patterns that exist as of each balance sheet date and could be subject to future changes. Changes to any one of these factors could significantly impact the estimate of FHN’s liability. OTHER DISCLOSURES Indemnification Agreements and Guarantees In the ordinary course of business, FHN enters into indemnification agreements for legal proceedings against its directors and officers and standard representations and warranties for underwriting agreements, merger and acquisition agreements, loan sales, contractual commitments, and various other business transactions or arrangements. The extent of FHN’s obligations under these agreements depends upon the occurrence of future events; therefore, it is not possible to estimate a maximum potential amount of payouts that could be required by such agreements.

Retirement Plans

Retirement Plans	9 Months Ended
	Sep. 30, 2021
Retirement Benefits, Description [Abstract]
Retirement Plans	Retirement Plans FHN sponsors a noncontributory, qualified defined benefit pension plan to employees hired or re-hired on or before September 1, 2007. Pension benefits are based on years of service, average compensation near retirement or other termination, and estimated social security benefits at age 65. Benefits under the plan are “frozen” so that years of service and compensation changes after 2012 do not affect the benefit owed. Minimum contributions are based upon actuarially determined amounts necessary to fund the total benefit obligation. Decisions to contribute to the plan are based upon pension funding requirements under the Pension Protection Act, the maximum amount deductible under the Internal Revenue Code, the actual performance of plan assets, and trends in the regulatory environment. FHN made no contributions to the qualified pension plan in 2020. FHN has not made a contribution to the qualified pension plan in 2021. Management anticipates that FHN will make an immaterial contribution to the qualified pension plan during the next twelve months. FHN also maintains non-qualified plans including a supplemental retirement plan that covers certain employees whose benefits under the qualified pension plan have been limited by tax rules. These other non-qualified plans are unfunded, and contributions to these plans cover all benefits paid under the non-qualified plans. Payments made under the non-qualified plans were $5 million for 2020. FHN anticipates making benefit payments under the non-qualified plans of $5 million in 2021. Service cost is included in personnel expense in the Consolidated Statements of Income. All other components of net periodic benefit cost are included in other expense. For more information on FHN's pension plan and other postretirement benefit plans, see Note 18 - Pension, Savings and Other Employee Benefits in FHN's 2020 Annual Report on Form 10-K. The components of net periodic benefit cost for the three months ended September 30 were as follows: (Dollars in millions) 2021 2020 Components of net periodic benefit cost Interest cost $ 4 $ 6 Expected return on plan assets (7) (7) Amortization of unrecognized: Actuarial (gain) loss 2 3 Net periodic benefit cost $ (1) $ 2 The components of net periodic benefit cost for the nine months ended September 30 were as follows: (Dollars in millions) 2021 2020 Components of net periodic benefit cost Interest cost $ 12 $ 17 Expected return on plan assets (15) (19) Amortization of unrecognized: Actuarial (gain) loss 6 10 Other 2 — Net periodic benefit cost $ 5 $ 8

Business Segment Information

Business Segment Information	9 Months Ended
	Sep. 30, 2021
Segment Reporting, Measurement Disclosures [Abstract]
Business Segment Information	Business Segment Information FHN's operating segments are composed of the following: • Regional Banking segment offers financial products and services, including traditional lending and deposit taking, to consumer and commercial clients primarily in the southern U.S. and other selected markets. Regional Banking also provides investment, wealth management, financial planning, trust and asset management services for consumer clients. • Specialty Banking segment consists of lines of business that deliver product offerings and services with specialized industry knowledge. Specialty Banking’s lines of business include asset-based lending, mortgage warehouse lending, commercial real estate, franchise finance, correspondent banking, equipment finance, mortgage, and title insurance. In addition to traditional lending and deposit taking, Specialty Banking also delivers treasury management solutions, loan syndications, and international banking. Additionally, Specialty Banking has a line of business focused on fixed income securities sales, trading, underwriting, and strategies for institutional clients in the U.S. and abroad, as well as loan sales, portfolio advisory services, and derivative sales. • Corporate segment consists primarily of corporate support functions including risk management, audit, accounting, finance, executive office, and corporate communications. Shared support services such as human resources, properties, technology, credit risk and bank operations are allocated to the activities of Regional Banking, Specialty Banking and Corporate. Additionally, the Corporate segment includes centralized management of capital and funding to support the business activities of the company including management of wholesale funding, liquidity, and capital management and allocation. The Corporate segment also includes the revenue and expense associated with run-off businesses such as pre-2009 mortgage banking elements, run-off consumer and trust preferred loan portfolios, and other exited businesses. Periodically, FHN adapts its segments to reflect managerial or strategic changes. During 2020, FHN reorganized its internal management structure and, accordingly, its segment reporting structure. Historically, FHN's reportable business segments were Regional Banking, Fixed Income, Corporate, and Non-strategic. The closing of the FHN and IBKC merger-of-equals transaction prompted organizational changes to better integrate and execute the combined Company's strategic priorities across all lines of businesses. As a result, segment information for 2020 has been reclassified to conform to the current period presentation. FHN may also modify its methodology of allocating expenses and equity among segments which could change historical segment results. Business segment revenue, expense, asset, and equity levels reflect those which are specifically identifiable or which are allocated based on an internal allocation method. Because the allocations are based on internally developed assignments and allocations, to an extent they are subjective. Generally, all assignments and allocations have been consistently applied for all periods presented. The following tables reflect financial information for each reportable business segment for the three and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, 2021 (Dollars in millions) Regional Banking Specialty Banking Corporate Consolidated Net interest income (expense) $ 444 $ 154 $ (106) $ 492 Provision for credit losses (52) (33) — (85) Noninterest income 112 142 (7) 247 Noninterest expense 301 141 84 526 Income (loss) before income taxes 307 188 (197) 298 Income tax expense (benefit) 72 45 (54) 63 Net income (loss) $ 235 $ 143 $ (143) $ 235 Average assets $ 40,722 $ 20,460 $ 27,219 $ 88,401 Three Months Ended September 30, 2020 (Dollars in millions) Regional Banking Specialty Banking Corporate Consolidated Net interest income (expense) $ 448 $ 161 $ (77) $ 532 Provision for credit losses 194 34 (1) 227 Noninterest income 97 181 545 823 Noninterest expense 301 138 148 587 Income (loss) before income taxes 50 170 321 541 Income tax expense (benefit) 9 41 (48) 2 Net income (loss) $ 41 $ 129 $ 369 $ 539 Average assets $ 43,703 $ 21,693 $ 16,287 $ 81,683 Nine Months Ended September 30, 2021 (Dollars in millions) Regional Banking Specialty Banking Corporate Consolidated Net interest income (expense) $ 1,314 $ 464 $ (282) $ 1,496 Provision for credit losses (172) (61) (12) (245) Noninterest income 320 476 33 829 Noninterest expense (a) 851 441 275 1,567 Income (loss) before income taxes 955 560 (512) 1,003 Income tax expense (benefit) 223 135 (136) 222 Net income (loss) $ 732 $ 425 $ (376) $ 781 Average assets $ 41,757 $ 20,669 $ 24,705 $ 87,131 (a) Includes $35 million in asset impairments related to IBKC merger integration efforts in the Corporate segment. Nine Months Ended September 30, 2020 (Dollars in millions) Regional Banking Specialty Banking Corporate Consolidated Net interest income (expense) $ 853 $ 400 $ (113) $ 1,140 Provision for credit losses 394 106 2 502 Noninterest income 239 410 555 1,204 Noninterest expense 639 359 212 1,210 Income (loss) before income taxes 59 345 228 632 Income tax expense (benefit) 7 84 (71) 20 Net income (loss) $ 52 $ 261 $ 299 $ 612 Average assets $ 27,962 $ 18,885 $ 10,963 $ 57,810 The following tables reflect a disaggregation of FHN’s noninterest income by major product line and reportable segment for the three and nine months ended September 30, 2021 and 2020: Three months ended September 30, 2021 (Dollars in millions) Regional Banking Specialty Banking Corporate Consolidated Noninterest income: Fixed income (a) $ — $ 96 $ — $ 96 Deposit transactions and cash management 39 3 2 44 Mortgage banking and title income — 33 1 34 Brokerage, management fees and commissions 24 — — 24 Bankcard income 14 1 — 15 Trust services and investment management 13 — — 13 Securities gains (losses), net (b) — — 1 1 Loss on debt extinguishment — — (23) (23) Other income (c) 22 9 12 43 Total noninterest income $ 112 $ 142 $ (7) $ 247 (a) Includes $12 million of underwriting, portfolio advisory, and other noninterest income in scope of ASC 606, "Revenue From Contracts With Customers." (b) Represents noninterest income excluded from the scope of ASC 606. Amount is presented for informational purposes to reconcile total noninterest income. (c) Includes other service charges, ATM and interchange fees, electronic banking fees, and insurance commissions in scope of ASC 606. Three months ended September 30, 2020 (Dollars in millions) Regional Banking Specialty Banking Corporate Consolidated Noninterest income: Fixed income (a) $ — $ 111 $ — $ 111 Mortgage banking and title income — 66 — 66 Deposit transactions and cash management 38 2 2 42 Brokerage, management fees and commissions 18 — — 18 Trust services and investment management 12 — — 12 Bankcard income 10 — — 10 Securities gains (losses), net (b) — — (1) (1) Purchase accounting gain — — 532 532 Other income (c) 19 2 12 33 Total noninterest income $ 97 $ 181 $ 545 $ 823 (a) Includes $10 million of underwriting, portfolio advisory, and other noninterest income in scope of ASC 606, "Revenue From Contracts With Customers." (b) Represents noninterest income excluded from the scope of ASC 606. Amount is presented for informational purposes to reconcile total noninterest income. (c) Includes other service charges, ATM and interchange fees, electronic banking fees, and insurance commissions in scope of ASC 606. Nine Months Ended September 30, 2021 (Dollars in millions) Regional Banking Specialty Banking Corporate Consolidated Noninterest income: Fixed income (a) $ 1 $ 323 $ — $ 324 Deposit transactions and cash management 117 8 5 130 Mortgage banking and title income — 124 2 126 Brokerage, management fees and commissions 65 — — 65 Bankcard income 37 2 1 40 Trust services and investment management 39 — — 39 Securities gains (losses), net (b) — — 12 12 Purchase accounting gain — — (1) (1) Loss on debt extinguishment — — (23) (23) Other income (c) 61 19 37 117 Total noninterest income $ 320 $ 476 $ 33 $ 829 (a) Includes $35 million of underwriting, portfolio advisory, and other noninterest income in scope of Accounting Standards Codification ("ASC") 606, "Revenue From Contracts With Customers." (b) Represents noninterest income excluded from the scope of ASC 606. Amount is presented for informational purposes to reconcile total noninterest income. (c) Includes other service charges, ATM and interchange fees, electronic banking fees, and insurance commissions in scope of ASC 606. Nine Months Ended September 30, 2020 (Dollars in millions) Regional Banking Specialty Banking Corporate Consolidated Noninterest income: Fixed income (a) $ 1 $ 318 $ — $ 319 Deposit transactions and cash management 91 8 4 103 Mortgage banking and title income — 71 1 72 Brokerage, management fees and commissions 47 — — 47 Trust services and investment management 27 — — 27 Bankcard income 23 1 — 24 Securities gains (losses), net (b) — — (2) (2) Purchase accounting gain — — 532 532 Other income (c) 50 12 20 82 Total noninterest income $ 239 $ 410 $ 555 $ 1,204 (a) Includes $29 million of underwriting, portfolio advisory, and other noninterest income in scope of Accounting Standards Codification ("ASC") 606, "Revenue From Contracts With Customers." (b) Represents noninterest income excluded from the scope of ASC 606. Amount is presented for informational purposes to reconcile total noninterest income. (c) Includes other service charges, ATM and interchange fees, electronic banking fees, and insurance commissions in scope of ASC 606.

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2021
Variable Interest Entities [Abstract]
Variable Interest Entities	Variable Interest Entities FHN makes equity investments in various entities that are considered VIEs, as defined by GAAP. A VIE typically does not have sufficient equity at risk to finance its activities without additional subordinated financial support from other parties. The Company’s variable interest arises from contractual, ownership or other monetary interests in the entity, which change with fluctuations in the fair value of the entity's net assets. FHN consolidates a VIE if FHN is the primary beneficiary of the entity. FHN is the primary beneficiary of a VIE if FHN's variable interest provides it with the power to direct the activities that most significantly impact the VIE and the right to receive benefits (or the obligation to absorb losses) that could potentially be significant to the VIE. To determine whether or not a variable interest held could potentially be significant to the VIE, FHN considers both qualitative and quantitative factors regarding the nature, size and form of its involvement with the VIE. FHN assesses whether or not it is the primary beneficiary of a VIE on an ongoing basis. Consolidated Variable Interest Entities FHN has established certain rabbi trusts related to deferred compensation plans offered to its employees. FHN contributes employee cash compensation deferrals to the trusts and directs the underlying investments made by the trusts. The assets of these trusts are available to FHN’s creditors only in the event that FHN becomes insolvent. These trusts are considered VIEs as there is no equity at risk in the trusts since FHN provided the equity interest to its employees in exchange for services rendered. FHN is considered the primary beneficiary of the rabbi trusts as it has the power to direct the activities that most significantly impact the economic performance of the rabbi trusts through its ability to direct the underlying investments made by the trusts. Additionally, FHN could potentially receive benefits or absorb losses that are significant to the trusts due to its right to receive any asset values in excess of liability payoffs and its obligation to fund any liabilities to employees that are in excess of a rabbi trust’s assets. The following table summarizes the carrying value of assets and liabilities associated with rabbi trusts used for deferred compensation plans which are consolidated by FHN as of September 30, 2021 and December 31, 2020: (Dollars in millions) September 30, 2021 December 31, 2020 Assets: Other assets $ 206 $ 195 Liabilities: Other liabilities $ 175 $ 165 Nonconsolidated Variable Interest Entities Low Income Housing Tax Credit Partnerships. Through designated wholly-owned subsidiaries, First Horizon Bank makes equity investments as a limited partner in various partnerships that sponsor affordable housing projects utilizing the LIHTC. The purpose of these investments is to achieve a satisfactory return on capital and to support FHN’s community reinvestment initiatives. LIHTC partnerships are managed by unrelated general partners that have the power to direct the activities which most significantly affect the performance of the partnerships. FHN is therefore not the primary beneficiary of any LIHTC partnerships. Accordingly, FHN does not consolidate these VIEs and accounts for these investments in other assets on the Consolidated Balance Sheets. FHN accounts for all qualifying LIHTC investments under the proportional amortization method. Under this method an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance as a component of income tax expense. LIHTC investments that do not qualify for the proportional amortization method are accounted for using the equity method. Expenses associated with non-qualifying LIHTC investments were not material for the three and nine months ended September 30, 2021 and 2020. The following table summarizes the impact to income tax expense on the Consolidated Statements of Income for the three and nine months ended September 30, 2021 and 2020 for LIHTC investments accounted for under the proportional amortization method. Three Months Ended Nine Months Ended (Dollars in millions) 2021 2020 2021 2020 Income tax expense (benefit): Amortization of qualifying LIHTC investments $ 9 $ 8 $ 26 $ 20 Low income housing tax credits (8) (7) (25) (16) Other tax benefits related to qualifying LIHTC investments (2) (3) (7) (8) Other Tax Credit Investments. Through designated subsidiaries, First Horizon Bank periodically makes equity investments as a non-managing member in various LLCs that sponsor community development projects utilizing the NMTC. First Horizon Bank also makes equity investments as a limited partner or non-managing member in entities that receive solar and historic tax credits. The purposes of these investments are to achieve a satisfactory return on capital and to support FHN’s community reinvestment initiatives. These entities are considered VIEs as First Horizon Bank's subsidiaries represent the holders of the equity investment at risk, but do not have the ability to direct the activities that most significantly affect the performance of the entities. Small Issuer Trust Preferred Holdings . First Horizon Bank holds variable interests in trusts which have issued mandatorily redeemable preferred capital securities (“trust preferreds”) for smaller banking and insurance enterprises. First Horizon Bank has no voting rights for the trusts’ activities. The trusts’ only assets are junior subordinated debentures of the issuing enterprises. The creditors of the trusts hold no recourse to the assets of First Horizon Bank. Since First Horizon Bank is solely a holder of the trusts’ securities, it has no rights which would give it the power to direct the activities that most significantly impact the trusts’ economic performance and thus it is not considered the primary beneficiary of the trusts. First Horizon Bank has no contractual requirements to provide financial support to the trusts. On-Balance Sheet Trust Preferred Securitization. In 2007, First Horizon Bank executed a securitization of certain small issuer trust preferreds for which the underlying trust meets the definition of a VIE as the holders of the equity investment at risk do not have the power through voting rights, or similar rights, to direct the activities that most significantly impact the entity’s economic performance. Since First Horizon Bank did not retain servicing or other decision-making rights, First Horizon Bank is not the primary beneficiary as it does not have the power to direct the activities that most significantly impact the trust’s economic performance. Accordingly, First Horizon Bank has accounted for the funds received through the securitization as a term borrowing in its Consolidated Balance Sheets. First Horizon Bank has no contractual requirements to provide financial support to the trust. Holdings in Agency Mortgage-Backed Securities. FHN holds securities issued by various Agency securitization trusts. Based on their restrictive nature, the trusts meet the definition of a VIE since the holders of the equity investments at risk do not have the power through voting rights, or similar rights, to direct the activities that most significantly impact the entities’ economic performance. FHN could potentially receive benefits or absorb losses that are significant to the trusts based on the nature of the trusts’ activities and the size of FHN’s holdings. However, FHN is solely a holder of the trusts’ securities and does not have the power to direct the activities that most significantly impact the trusts’ economic performance and is not considered the primary beneficiary of the trusts. FHN has no contractual requirements to provide financial support to the trusts. Commercial Loan Troubled Debt Restructurings. For certain troubled commercial loans, First Horizon Bank restructures the terms of the borrower’s debt in an effort to increase the probability of receipt of amounts contractually due. Following a troubled debt restructuring, the borrower entity typically meets the definition of a VIE as the initial determination of whether an entity is a VIE must be reconsidered as events have proven that the entity’s equity is not sufficient to permit it to finance its activities without additional subordinated financial support or a restructuring of the terms of its financing. As First Horizon Bank does not have the power to direct the activities that most significantly impact such troubled commercial borrowers’ operations, it is not considered the primary beneficiary even in situations where, based on the size of the financing provided, First Horizon Bank is exposed to potentially significant benefits and losses of the borrowing entity. First Horizon Bank has no contractual requirements to provide financial support to the borrowing entities beyond certain funding commitments established upon restructuring of the terms of the debt that allows for preparation of the underlying collateral for sale. Proprietary Trust Preferred Issuances . In conjunction with its acquisitions, FHN acquired junior subordinated debt underlying multiple issuances of trust preferred debt. All of the trusts are considered VIEs because the ownership interests from the capital contributions to these trusts are not considered “at risk” in evaluating whether the holders of the equity investments at risk in the trusts have the ability to direct the activities that most significantly impact the entities’ economic performance. Thus, FHN cannot be the trusts’ primary beneficiary because its ownership interests in the trusts are not considered variable interests as they are not considered “at risk”. Consequently, none of the trusts are consolidated by FHN. The following table summarizes FHN’s nonconsolidated VIEs as of September 30, 2021: (Dollars in millions) Maximum Liability Classification Type Low income housing partnerships $ 349 $ 116 (a) Other tax credit investments (b) 63 42 Other assets Small issuer trust preferred holdings (c) 202 — Loans and leases On-balance sheet trust preferred securitization 30 84 (d) Holdings of agency mortgage-backed securities (c) 7,380 — (e) Commercial loan troubled debt restructurings (f) 117 — Loans and leases Proprietary trust preferred issuances (g) — 184 Term borrowings (a) Maximum loss exposure represents $233 million of current investments and $116 million of accrued contractual funding commitments. Accrued funding commitments represent unconditional contractual obligations for future funding events and are also recognized in other liabilities. FHN currently expects to be required to fund these accrued commitments by the end of 2024. (b) Maximum loss exposure represents the value of current investments. (c) Maximum loss exposure represents the value of current investments. A liability is not recognized as FHN is solely a holder of the trusts’ securities. (d) Includes $112 million classified as loans and leases and $2 million classified as trading securities which are offset by $84 million classified as term borrowings. (e) Includes $514 million classified as trading securities, $6.6 billion classified as securities available for sale and $304 million classified as held to maturity. (f) Maximum loss exposure represents $113 million of current receivables and $4 million of contractual funding commitments on loans related to commercial borrowers involved in a troubled debt restructuring. (g) No exposure to loss due to nature of FHN's involvement. The following table summarizes FHN’s nonconsolidated VIEs as of December 31, 2020: (Dollars in millions) Maximum Liability Classification Type Low income housing partnerships $ 338 $ 132 (a) Other tax credit investments (b) 64 42 Other assets Small issuer trust preferred holdings (c) 210 — Loans and leases On-balance sheet trust preferred securitization 32 82 (d) Holdings of agency mortgage-backed securities (c) 7,063 — (e) Commercial loan troubled debt restructurings (f) 186 — Loans and leases Proprietary trust preferred issuances (g) — 287 Term borrowings (a) Maximum loss exposure represents $206 million of current investments and $132 million of accrued contractual funding commitments. Accrued funding commitments represent unconditional contractual obligations for future funding events and are also recognized in other liabilities. FHN currently expects to be required to fund these accrued commitments by the end of 2024. (b) Maximum loss exposure represents current investments. (c) Maximum loss exposure represents the value of current investments. A liability is not recognized as FHN is solely a holder of the trusts’ securities. (d) Includes $112 million classified as loans and leases and $2 million classified as trading securities which are offset by $82 million classified as term borrowings. (e) Includes $845 million classified as trading securities and $6.2 billion classified as securities available for sale. (f) Maximum loss exposure represents $176 million of current receivables and $10 million of contractual funding commitments on loans related to commercial borrowers involved in a troubled debt restructuring.

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives In the normal course of business, FHN utilizes various financial instruments (including derivative contracts and credit-related agreements) through its fixed income and risk management operations, as part of its risk management strategy and as a means to meet clients’ needs. Derivative instruments are subject to credit and market risks in excess of the amount recorded on the balance sheet as required by GAAP. The contractual or notional amounts of these financial instruments do not necessarily represent the amount of credit or market risk. However, they can be used to measure the extent of involvement in various types of financial instruments. Controls and monitoring procedures for these instruments have been established and are routinely reevaluated. The ALCO controls, coordinates, and monitors the usage and effectiveness of these financial instruments. Credit risk represents the potential loss that may occur if a party to a transaction fails to perform according to the terms of the contract. The measure of credit exposure is the replacement cost of contracts with a positive fair value. FHN manages credit risk by entering into financial instrument transactions through national exchanges, primary dealers or approved counterparties, and by using mutual margining and master netting agreements whenever possible to limit potential exposure. FHN also maintains collateral posting requirements with certain counterparties to limit credit risk. Daily margin posted or received with central clearinghouses is considered a legal settlement of the related derivative contracts which results in a net presentation for each contract in the Consolidated Balance Sheets. Treatment of daily margin as a settlement has no effect on hedge accounting or gains/losses for the applicable derivative contracts. On September 30, 2021 and December 31, 2020, respectively, FHN had $180 million and $280 million of cash receivables and $111 million and $166 million of cash payables related to collateral posting under master netting arrangements, inclusive of collateral posted related to contracts with adjustable collateral posting thresholds and over-collateralized positions, with derivative counterparties. With exchange-traded contracts, the credit risk is limited to the clearinghouse used. For non-exchange traded instruments, credit risk may occur when there is a gain in the fair value of the financial instrument and the counterparty fails to perform according to the terms of the contract and/or when the collateral proves to be of insufficient value. See additional discussion regarding master netting agreements and collateral posting requirements later in this note under the heading “Master Netting and Similar Agreements.” Market risk represents the potential loss due to the decrease in the value of a financial instrument caused primarily by changes in interest rates or the prices of debt instruments. FHN manages market risk by establishing and monitoring limits on the types and degree of risk that may be undertaken. FHN continually measures this risk through the use of models that measure value-at-risk and earnings-at-risk. Derivative Instruments. FHN enters into various derivative contracts both to facilitate client transactions and as a risk management tool. Where contracts have been created for clients, FHN enters into upstream transactions with dealers to offset its risk exposure. Contracts with dealers that require central clearing are novated to a clearing agent who becomes FHN’s counterparty. Derivatives are also used as a risk management tool to hedge FHN’s exposure to changes in interest rates or other defined market risks. Forward contracts are over-the-counter contracts where two parties agree to purchase and sell a specific quantity of a financial instrument at a specified price, with delivery or settlement at a specified date. Futures contracts are exchange-traded contracts where two parties agree to purchase and sell a specific quantity of a financial instrument at a specified price, with delivery or settlement at a specified date. Interest rate option contracts give the purchaser the right, but not the obligation, to buy or sell a specified quantity of a financial instrument, at a specified price, during a specified period of time. Caps and floors are options that are linked to a notional principal amount and an underlying indexed interest rate. Interest rate swaps involve the exchange of interest payments at specified intervals between two parties without the exchange of any underlying principal. Swaptions are options on interest rate swaps that give the purchaser the right, but not the obligation, to enter into an interest rate swap agreement during a specified period of time. Trading Activities FHNF trades U.S. Treasury, U.S. Agency, government-guaranteed loan, mortgage-backed, corporate and municipal fixed income securities, and other securities for distribution to clients. When these securities settle on a delayed basis, they are considered forward contracts. FHNF also enters into interest rate contracts, including caps, swaps, and floors, for its clients. In addition, FHNF enters into futures and option contracts to economically hedge interest rate risk associated with a portion of its securities inventory. These transactions are measured at fair value, with changes in fair value recognized in noninterest income. Related assets and liabilities are recorded on the Consolidated Balance Sheets as derivative assets and derivative liabilities within other assets and other liabilities. The FHNF Risk Committee and the Credit Risk Management Committee collaborate to mitigate credit risk related to these transactions. Credit risk is controlled through credit approvals, risk control limits, and ongoing monitoring procedures. Total trading revenues were $85 million and $99 million for the three months ended September 30, 2021 and 2020, and $291 million and $278 million for the nine months ended September 30, 2021 and 2020, respectively. Trading revenues are inclusive of both derivative and non-derivative financial instruments and are included in fixed income on the Consolidated Statements of Income. The following tables summarize derivatives associated with FHNF's trading activities as of September 30, 2021 and December 31, 2020: September 30, 2021 (Dollars in millions) Notional Assets Liabilities Customer interest rate contracts $ 3,806 $ 113 $ 36 Offsetting upstream interest rate contracts 3,806 3 17 Option contracts purchased 23 — — Forwards and futures purchased 9,173 6 31 Forwards and futures sold 9,737 37 4 December 31, 2020 (Dollars in millions) Notional Assets Liabilities Customer interest rate contracts $ 3,950 $ 207 $ 7 Offsetting upstream interest rate contracts 3,950 2 17 Forwards and futures purchased 10,795 62 — Forwards and futures sold 11,633 1 65 Interest Rate Risk Management FHN’s ALCO focuses on managing market risk by controlling and limiting earnings volatility attributable to changes in interest rates. Interest rate risk exists to the extent that interest-earning assets and interest-bearing liabilities have different maturity or repricing characteristics. FHN uses derivatives, primarily swaps, that are designed to moderate the impact on earnings as interest rates change. Interest paid or received for swaps utilized by FHN to hedge the fair value of long term debt is recognized as an adjustment of the interest expense of the liabilities whose risk is being managed. FHN’s interest rate risk management policy is to use derivatives to hedge interest rate risk or market value of assets or liabilities, not to speculate. In addition, FHN has entered into certain interest rate swaps and caps as a part of a product offering to commercial clients that includes customer derivatives paired with upstream offsetting market instruments that, when completed, are designed to mitigate interest rate risk. These contracts do not qualify for hedge accounting and are measured at fair value with gains or losses included in current earnings in noninterest expense on the Consolidated Statements of Income. FHN had designated a derivative transaction in a hedging strategy to manage interest rate risk on $500 million of senior debt prior to its maturity in December 2020. This transaction qualified for hedge accounting using the long-haul method. FHN early redeemed the $500 million senior debt in November 2020. The following tables summarize FHN’s derivatives associated with interest rate risk management activities as of September 30, 2021 and December 31, 2020: September 30, 2021 (Dollars in millions) Notional Assets Liabilities Customer Interest Rate Contracts Hedging Hedging Instruments and Hedged Items: Customer interest rate contracts $ 7,745 $ 260 $ 16 Offsetting upstream interest rate contracts 7,685 3 26 December 31, 2020 (Dollars in millions) Notional Assets Liabilities Customer Interest Rate Contracts Hedging Hedging Instruments and Hedged Items: Customer interest rate contracts $ 6,868 $ 436 $ 1 Offsetting upstream interest rate contracts 6,868 5 35 The following table summarizes gains (losses) on FHN’s derivatives associated with interest rate risk management activities for the three and nine months ended September 30, 2021 and 2020: Three Months Ended Nine Months Ended 2021 2020 2021 2020 (Dollars in millions) Gains (Losses) Gains (Losses) Gains (Losses) Gains (Losses) Customer Interest Rate Contracts Hedging Hedging Instruments and Hedged Items: Customer interest rate contracts (a) $ (29) $ (14) $ (197) $ 197 Offsetting upstream interest rate contracts (a) 29 14 $ 197 $ (197) Debt Hedging Hedging Instruments: Interest rate swaps (b) $ — $ (1) $ — $ 3 Hedged Items: Term borrowings (a) (c) — 1 — (2) (a) Gains (losses) included in other expense within the Consolidated Statements of Income. (b) Gains (losses) included in interest expense. (c) Represents gains and losses attributable to changes in fair value due to interest rate risk as designated in ASC 815-20 hedging relationships. Cash Flow Hedges Prior to 2021, FHN had pay floating, receive fixed interest rate swaps designed to manage its exposure to the variability in cash flows related to interest payments on debt instruments, which primarily consisted of held-to-maturity trust preferred loans. In conjunction with the IBKC merger, FHN acquired interest rate contracts (floors and collars) which have been re-designated as cash flow hedges. The debt instruments primarily consist of held-to-maturity commercial loans that have variable interest payments based on 1-month LIBOR. In a cash flow hedge, the entire change in the fair value of the interest rate swap included in the assessment of hedge effectiveness is initially recorded in OCI and is subsequently reclassified from OCI to current period earnings (interest income or interest expense) in the same period that the hedged item affects earnings. The following tables summarize FHN’s derivative activities associated with cash flow hedges as of September 30, 2021 and December 31, 2020: September 30, 2021 (Dollars in millions) Notional Assets Liabilities Cash Flow Hedges Hedging Instruments: Interest rate contracts $ 1,100 $ 19 $ — Hedged Items: Variability in cash flows related to debt instruments (primarily loans) N/A $ 1,100 N/A December 31, 2020 (Dollars in millions) Notional Assets Liabilities Cash Flow Hedges Hedging Instruments: Interest rate contracts $ 1,250 $ 32 $ — Hedged Items: Variability in cash flows related to debt instruments (primarily loans) N/A $ 1,250 N/A The following table summarizes gains (losses) on FHN’s derivatives associated with cash flow hedges for the three and nine months ended September 30, 2021 and 2020: Three Months Ended Nine Months Ended 2021 2020 2021 2020 (Dollars in millions) Gains (Losses) Gains (Losses) Gains (Losses) Gains (Losses) Cash Flow Hedges Hedging Instruments: Interest rate contracts (a) $ (6) $ (8) $ (20) $ 10 Gain (loss) recognized in other comprehensive income (loss) — (1) (1) 14 Gain (loss) reclassified from AOCI into interest income (1) (2) (4) (4) (a) Approximately $20 million of pre-tax gains are expected to be reclassified into earnings in the next twelve months. Other Derivatives As part of the IBKC merger, FHN acquired mortgage banking operations that include the origination and sale of loans into the secondary market. As part of the origination of loans, FHN enters into interest rate lock commitments with borrowers. Additionally, FHN enters into forward sales contracts with buyers for delivery of loans at a future date. Both of these contracts qualify as freestanding derivatives and are recognized at fair value through earnings. The notional and fair values of these contracts are presented in the table below. Balances and activity for periods prior to the IBKC merger were not significant. September 30, 2021 (Dollars in millions) Notional Assets Liabilities Mortgage Banking Hedges Option contracts written $ 419 $ 7 $ — Forward contracts purchased 522 3 — December 31, 2020 (Dollars in millions) Notional Assets Liabilities Mortgage Banking Hedges Option contracts written $ 667 $ 20 $ — Forward contracts purchased 725 — 6 The following table summarizes gains (losses) on FHN's derivatives associated with mortgage banking activities for the three and nine months ended September 30, 2021. Three Months Ended September 30, Three Months Ended September 30, Nine Months Ended September 30, Nine months ended September 30, 2021 2020 2021 2020 (Dollars in millions) Gains (Losses) Gains (Losses) Gains (Losses) Gains (Losses) Mortgage Banking Hedges Option contracts written $ (3) $ 7 $ (12) $ 7 Forward contracts purchased (2) (10) 10 (10) In conjunction with pre-2020 sales of Visa Class B shares, FHN entered into derivative transactions whereby FHN will make or receive cash payments whenever the conversion ratio of the Visa Class B shares into Visa Class A shares is adjusted. As of September 30, 2021 and December 31, 2020, the derivative liabilities associated with the sales of Visa Class B shares were $16 million and $13 million, respectively. See Note 17 - Fair Value of Assets and Liabilities for discussion of the valuation inputs and processes for these Visa-related derivatives. FHN utilizes cross currency swaps and cross currency interest rate swaps to economically hedge its exposure to foreign currency risk and interest rate risk associated with non-U.S. dollar denominated loans. As of September 30, 2021 and December 31, 2020, these loans were valued at $10 million and $12 million, respectively. The balance sheet amount and the gains/losses associated with these derivatives were not significant. Related to its loan participation/syndication activities, FHN enters into risk participation agreements under which it assumes exposure for, or receives indemnification for, borrowers’ performance on underlying interest rate derivative contracts. As of September 30, 2021 and December 31, 2020, the notional values of FHN’s risk participations were $234 million and $233 million of derivative assets and $512 million and $464 million of derivative liabilities, respectively. Assuming all underlying third party customers referenced in the swap contracts defaulted at September 30, 2021 and December 31, 2020, the exposure from these agreements would not be material based on the fair value of the underlying swaps. In conjunction with the IBKC merger, FHN obtained certain certificates of deposit with the rate of return based on an equity index which is considered an embedded derivative as a written option that must be separately recognized. The risks of the written option are offset by purchasing an option with terms that mirror the written option, which is also carried at fair value on the Company’s Consolidated Balance Sheets. As of September 30, 2021 and December 31, 2020, FHN had recognized $1 million of both assets and liabilities associated with these contracts. Master Netting and Similar Agreements FHN uses master netting agreements, mutual margining agreements and collateral posting requirements to minimize credit risk on derivative contracts. Master netting and similar agreements are used when counterparties have multiple derivatives contracts that allow for a “right of setoff,” meaning that a counterparty may net offsetting positions and collateral with the same counterparty under the contract to determine a net receivable or payable. The following discussion provides an overview of these arrangements which may vary due to the derivative type and market in which a derivative transaction is executed. Interest rate derivatives are subject to agreements consistent with standard agreement forms of the ISDA. Currently, all interest rate derivative contracts are entered into as over-the-counter transactions and collateral posting requirements are based on the net asset or liability position with each respective counterparty. For contracts that require central clearing, novation to a counterparty with access to a clearinghouse occurs and initial margin is posted. Cash margin received (posted) that is considered settlements for the derivative contracts is included in the respective derivative asset (liability) value. Cash margin that is considered collateral received (posted) for interest rate derivatives is recognized as a liability (asset) on FHN’s Consolidated Balance Sheets. Interest rate derivatives with clients that are smaller financial institutions typically require posting of collateral by the counterparty to FHN. This collateral is subject to a threshold with daily adjustments based upon changes in the level or fair value of the derivative position. Positions and related collateral can be netted in the event of default. Collateral pledged by a counterparty is typically cash or securities. The securities pledged as collateral are not recognized within FHN’s Consolidated Balance Sheets. Interest rate derivatives associated with lending arrangements share the collateral with the related loan(s). The derivative and loan positions may be netted in the event of default. For disclosure purposes, the entire collateral amount is allocated to the loan. Interest rate derivatives with larger financial institutions entered into prior to required central clearing typically contain provisions whereby the collateral posting thresholds under the agreements adjust based on the credit ratings of both counterparties. If the credit rating of FHN and/or First Horizon Bank is lowered, FHN could be required to post additional collateral with the counterparties. Conversely, if the credit rating of FHN and/or First Horizon Bank is increased, FHN could have collateral released and be required to post less collateral in the future. Also, if a counterparty’s credit ratings were to decrease, FHN and/or First Horizon Bank could require the posting of additional collateral; whereas if a counterparty’s credit ratings were to increase, the counterparty could require the release of excess collateral. Collateral for these arrangements is adjusted daily based on changes in the net fair value position with each counterparty. The net fair value, determined by individual counterparty, of all derivative instruments with adjustable collateral posting thresholds was $93 million of assets and $17 million of liabilities on September 30, 2021, and $200 million of assets and $5 million of liabilities on December 31, 2020. As of September 30, 2021 and December 31, 2020, FHN had received collateral of $221 million and $320 million and posted collateral of $3 million and $34 million, respectively, in the normal course of business related to these agreements. Certain agreements entered into prior to required central clearing also contain accelerated termination provisions, inclusive of the right of offset, if a counterparty’s credit rating falls below a specified level. If a counterparty’s debt rating (including FHN’s and First Horizon Bank’s) were to fall below these minimums, these provisions would be triggered, and the counterparties could terminate the agreements and require immediate settlement of all derivative contracts under the agreements. The net fair value, determined by individual counterparty, of all interest rate derivative instruments with credit-risk-related contingent accelerated termination provisions was $103 million of assets and $20 million of liabilities on September 30, 2021, and $216 million of assets and $17 million of liabilities on December 31, 2020. As of September 30, 2021 and December 31, 2020, FHN had received collateral of $232 million and $343 million and posted collateral of $6 million and $53 million, respectively, in the normal course of business related to these contracts. FHNF buys and sells various types of securities for its clients. When these securities settle on a delayed basis, they are considered forward contracts, and are generally not subject to master netting agreements. For futures and options, FHN transacts through a third party, and the transactions are subject to margin and collateral maintenance requirements. In the event of default, open positions can be offset along with the associated collateral. For this disclosure, FHN considers the impact of master netting and other similar agreements which allow FHN to settle all contracts with a single counterparty on a net basis and to offset the net derivative asset or liability position with the related securities and cash collateral. The application of the collateral cannot reduce the net derivative asset or liability position below zero, and therefore any excess collateral is not reflected in the following tables. The following table provides details of derivative assets and collateral received as presented on the Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020: Gross amounts not offset in the Balance Sheets (Dollars in millions) Gross amounts Gross amounts Net amounts of Derivative Collateral Net amount Derivative assets: September 30, 2021 Interest rate derivative contracts $ 408 $ — $ 408 $ (31) $ (217) $ 160 Forward contracts 43 — 43 (20) (4) 19 $ 451 $ — $ 451 $ (51) $ (221) $ 179 December 31, 2020 Interest rate derivative contracts $ 702 $ — $ 702 $ (7) $ (327) $ 368 Forward contracts 63 — 63 (14) (20) 29 $ 765 $ — $ 765 $ (21) $ (347) $ 397 (a) Included in other assets on the Consolidated Balance Sheets. As of September 30, 2021 and December 31, 2020, $4 million of derivative assets have been excluded from these tables because they are generally not subject to master netting or similar agreements. The following table provides details of derivative liabilities and collateral pledged as presented on the Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020: Gross amounts not offset (Dollars in millions) Gross amounts Gross amounts Net amounts of Derivative Collateral Net amount Derivative liabilities: September 30, 2021 Interest rate derivative contracts $ 95 $ — $ 95 $ (31) $ (9) $ 55 Forward contracts 35 — 35 (20) (12) 3 $ 130 $ — $ 130 $ (51) $ (21) $ 58 December 31, 2020 Interest rate derivative contracts $ 60 $ — $ 60 $ (7) $ (31) $ 22 Forward contracts 65 — 65 (14) (51) — $ 125 $ — $ 125 $ (21) $ (82) $ 22 (a) Included in other liabilities on the Consolidated Balance Sheets. As of September 30, 2021 and December 31, 2020, $17 million and $22 million, respectively, of derivative liabilities (primarily Visa-related derivatives) have been excluded from these tables because they are generally not subject to master netting or similar agreements.

Master Netting and Similar Agre

Master Netting and Similar Agreements—Repurchase, Reverse Repurchase, and Securities Borrowing Transactions	9 Months Ended
	Sep. 30, 2021
Offsetting [Abstract]
Master Netting and Similar Agreements—Repurchase, Reverse Repurchase, and Securities Borrowing Transactions	Master Netting and Similar Agreements—Repurchase, Reverse Repurchase, and Securities Borrowing Transactions For repurchase, reverse repurchase and securities borrowing transactions, FHN and each counterparty have the ability to offset all open positions and related collateral in the event of default. Due to the nature of these transactions, the value of the collateral for each transaction approximates the value of the corresponding receivable or payable. For repurchase agreements through FHN’s fixed income business (securities purchased under agreements to resell and securities sold under agreements to repurchase), transactions are collateralized by securities and/or government guaranteed loans which are delivered on the settlement date and are maintained throughout the term of the transaction. For FHN’s repurchase agreements through banking activities (securities sold under agreements to repurchase), securities are typically pledged at settlement and not released until maturity. For asset positions, the collateral is not included on FHN’s Consolidated Balance Sheets. For liability positions, securities collateral pledged by FHN is generally represented within FHN’s trading or available-for-sale securities portfolios. For this disclosure, FHN considers the impact of master netting and other similar agreements that allow FHN to settle all contracts with a single counterparty on a net basis and to offset the net asset or liability position with the related securities collateral. The application of the collateral cannot reduce the net asset or liability position below zero, and therefore any excess collateral is not reflected in the tables below. Securities purchased under agreements to resell is included in federal funds sold and securities purchased under agreements to resell in the Consolidated Balance Sheets. Securities sold under agreements to repurchase is included in short-term borrowings. The following table provides details of securities purchased under agreements to resell and collateral pledged by counterparties as of September 30, 2021 and December 31, 2020: Gross amounts not offset in the (Dollars in millions) Gross amounts Gross amounts Net amounts of Offsetting Securities collateral Net amount Securities purchased under agreements to resell: September 30, 2021 $ 355 $ — $ 355 $ (12) $ (341) $ 2 December 31, 2020 380 — 380 — (379) 1 The following table provides details of securities sold under agreements to repurchase and collateral pledged by FHN as of September 30, 2021 and December 31, 2020: Gross amounts not offset in the (Dollars in millions) Gross amounts Gross amounts Net amounts of Offsetting Securities/ Net amount Securities sold under agreements to repurchase: September 30, 2021 $ 1,299 $ — $ 1,299 $ (12) $ (1,287) $ — December 31, 2020 1,187 — 1,187 — (1,187) — Due to the short duration of securities sold under agreements to repurchase and the nature of collateral involved, the risks associated with these transactions are considered minimal. The following tables provide details, by collateral type, of the remaining contractual maturity of securities sold under agreements to repurchase as of September 30, 2021 and December 31, 2020: September 30, 2021 (Dollars in millions) Overnight and Up to 30 Days Total Securities sold under agreements to repurchase: U.S. treasuries $ 17 $ — $ 17 Government agency issued MBS 1,097 — 1,097 Government agency issued CMO 1 — 1 Other U.S. government agencies 51 — 51 Government guaranteed loans (SBA and USDA) 133 — 133 Total securities sold under agreements to repurchase $ 1,299 $ — $ 1,299 December 31, 2020 (Dollars in millions) Overnight and Up to 30 Days Total Securities sold under agreements to repurchase: U.S. treasuries $ 284 $ — $ 284 Government agency issued MBS 616 — 616 Government agency issued CMO 10 — 10 Other U.S. government agencies 151 — 151 Government guaranteed loans (SBA and USDA) 126 — 126 Total securities sold under agreements to repurchase $ 1,187 $ — $ 1,187

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value of Assets and Liabilities	Fair Value of Assets and Liabilities FHN groups its assets and liabilities measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. This hierarchy requires FHN to maximize the use of observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. Each fair value measurement is placed into the proper level based on the lowest level of significant input. These levels are: • Level 1—Valuation is based upon quoted prices for identical instruments traded in active markets. • Level 2—Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. • Level 3—Valuation is generated from model-based techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of option pricing models, discounted cash flow models, and similar techniques. Recurring Fair Value Measurements The following tables present the balances of assets and liabilities measured at fair value on a recurring basis as of September 30, 2021 and December 31, 2020: September 30, 2021 (Dollars in millions) Level 1 Level 2 Level 3 Total Trading securities: U.S. treasuries $ — $ 66 $ — $ 66 Government agency issued MBS — 276 — 276 Government agency issued CMO — 238 — 238 Other U.S. government agencies — 196 — 196 States and municipalities — 39 — 39 Corporate and other debt — 504 — 504 Total trading securities — 1,319 — 1,319 Loans held for sale (elected fair value) — 277 24 301 Securities available for sale: U.S. treasuries — 603 — 603 Government agency issued MBS — 4,345 — 4,345 Government agency issued CMO — 2,217 — 2,217 Other U.S. government agencies — 788 — 788 States and municipalities — 525 — 525 Interest-only strips (elected fair value) — — 16 16 Total securities available for sale — 8,478 16 8,494 Other assets: Deferred compensation mutual funds 127 — — 127 Equity, mutual funds, and other 28 — — 28 Derivatives, forwards and futures 46 — — 46 Derivatives, interest rate contracts — 405 — 405 Derivatives, other — 2 — 2 Total other assets 201 407 — 608 Total assets $ 201 $ 10,481 $ 40 $ 10,722 Trading liabilities: U.S. treasuries $ — $ 222 $ — $ 222 States and municipalities — 1 — 1 Corporate and other debt — 92 — 92 Total trading liabilities — 315 — 315 Other liabilities: Derivatives, forwards and futures 35 — — 35 Derivatives, interest rate contracts — 95 — 95 Derivatives, other — 1 16 17 Total other liabilities 35 96 16 147 Total liabilities $ 35 $ 411 $ 16 $ 462 December 31, 2020 (Dollars in millions) Level 1 Level 2 Level 3 Total Trading securities: U.S. treasuries $ — $ 81 $ — $ 81 Government agency issued MBS — 633 — 633 Government agency issued CMO — 212 — 212 Other U.S. government agencies — 62 — 62 States and municipalities — 7 — 7 Corporate and other debt — 181 — 181 Total trading securities — 1,176 — 1,176 Loans held for sale (elected fair value) — 393 12 405 Loans held for investment (elected fair value) — — 16 16 Securities available for sale: U.S. treasuries — 613 — 613 Government agency issued MBS — 3,812 — 3,812 Government agency issued CMO — 2,406 — 2,406 Other U.S. government agencies — 684 — 684 States and municipalities — 460 — 460 Corporate and other debt — 40 — 40 Interest-only strips (elected fair value) — — 32 32 Total securities available for sale — 8,015 32 8,047 Other assets: Deferred compensation mutual funds 118 — — 118 Equity, mutual funds, and other 25 — — 25 Derivatives, forwards and futures 63 — — 63 Derivatives, interest rate contracts — 702 — 702 Derivatives, other — 4 — 4 Total other assets 206 706 — 912 Total assets $ 206 $ 10,290 $ 60 $ 10,556 Trading liabilities: U.S. treasuries $ — $ 307 $ — $ 307 Government agency issued MBS — 3 — 3 Corporates and other debt — 43 — 43 Total trading liabilities — 353 — 353 Other liabilities: Derivatives, forwards and futures 71 — — 71 Derivatives, interest rate contracts — 60 — 60 Derivatives, other — 4 14 18 Total other liabilities 71 64 14 149 Total liabilities $ 71 $ 417 $ 14 $ 502 Changes in Recurring Level 3 Fair Value Measurements The changes in Level 3 assets and liabilities measured at fair value for the three months ended September 30, 2021 and 2020 on a recurring basis are summarized as follows: Three Months Ended September 30, 2021 (Dollars in millions) Interest- only strips- AFS Loans held Net Balance on July 1, 2021 $ 30 $ 25 $ (18) Total net gains (losses) included in net income 1 — — Purchases — 3 — Sales (35) (8) — Settlements — — 2 Net transfers into (out of) Level 3 20 (b) 4 — Balance on September 30, 2021 $ 16 $ 24 $ (16) Net unrealized gains (losses) included in net income $ — (c) $ — (a) $ — (d) Three Months Ended September 30, 2020 (Dollars in millions) Trading Interest-only-strips-AFS Loans held for sale Loans Net Balance on July 1, 2020 $ 1 $ 25 $ 13 $ — $ (19) Acquired — — — 13 — Total net gains (losses) included in net income — (1) — — — Purchases — — — — — Sales — — — (3) — Settlements — — (1) (2) 2 Net transfers into (out of) Level 3 — 9 (b) — 4 — Balance on September 30, 2020 $ 1 $ 33 $ 12 $ 12 $ (17) Net unrealized gains (losses) included in net income $ — (a) $ 1 (c) $ — (a) $ — $ — (d) (a) Primarily included in mortgage banking and title income on the Consolidated Statements of Income. (b) Transfers into interest-only strips - AFS level 3 measured on a recurring basis reflect movements from loans held for sale (Level 2 nonrecurring). (c) Primarily included in fixed income on the Consolidated Statements of Income. (d) Included in other expense. The changes in Level 3 assets and liabilities measured at fair value for the nine months ended September 30, 2021 and 2020, on a recurring basis are summarized as follows: Nine Months Ended September 30, 2021 (Dollars in millions) Interest- only strips- AFS Loans held Loans held for investment Net Balance on January 1, 2021 $ 32 $ 12 $ 16 $ (14) Total net gains (losses) included in net income 5 2 — (9) Purchases — 8 — — Sales (68) (18) — — Settlements — (2) (2) 7 Net transfers into (out of) Level 3 47 (b) 22 (e) (14) (e) — Balance on September 30, 2021 $ 16 $ 24 $ — $ (16) Net unrealized gains (losses) included in net income $ — (c) $ 2 (a) $ — $ (9) (d) Nine Months Ended September 30, 2020 (Dollars in millions) Trading Interest-only-strips-AFS Loans held for sale Loans held for investment Net Balance on January 1, 2020 $ 1 $ 19 $ 14 $ — $ (23) Acquired — — — 13 — Total net gains (losses) included in net income — (4) 1 — (1) Purchases — 5 — — — Sales — (8) — (3) — Settlements — — (3) (2) 7 Net transfers into (out of) Level 3 — 21 (b) — 4 — Balance on September 30, 2020 $ 1 $ 33 $ 12 $ 12 $ (17) Net unrealized gains (losses) included in net income $ — (a) $ 3 (c) $ 1 (a) $ — $ (1) (d) (a) Primarily included in mortgage banking and title income on the Consolidated Statements of Income. (b) Transfers into interest-only strips - AFS level 3 measured on a recurring basis reflect movements from loans held for sale (Level 2 nonrecurring). (c) Primarily included in fixed income on the Consolidated Statements of Income. (d) Included in other expense. (e) The loans held for investment at fair value option portfolio was transferred to the loans held for sale portfolio on July 1, 2021. There were no net unrealized gains (losses) for Level 3 assets and liabilities included in other comprehensive income as of September 30, 2021 and 2020. Nonrecurring Fair Value Measurements From time to time, FHN may be required to measure certain other financial assets at fair value on a nonrecurring basis in accordance with GAAP. These adjustments to fair value usually result from the application of lower of cost or market (LOCOM) accounting or write-downs of individual assets. For assets measured at fair value on a nonrecurring basis which were still held on the Consolidated Balance Sheets at September 30, 2021, and December 31, 2020, respectively, the following tables provide the level of valuation assumptions used to determine each adjustment and the related carrying value. Carrying value at September 30, 2021 (Dollars in millions) Level 1 Level 2 Level 3 Total Loans held for sale—SBAs and USDA $ — $ 693 $ 1 $ 694 Loans held for sale—first mortgages — — 1 1 Loans and leases (a) — — 86 86 OREO (b) — — 6 6 Other assets (c) — — 10 10 Carrying value at December 31, 2020 (Dollars in millions) Level 1 Level 2 Level 3 Total Loans held for sale—SBAs and USDA $ — $ 508 $ 1 $ 509 Loans held for sale—first mortgages — — 1 1 Loans and leases (a) — — 77 77 OREO (b) — — 15 15 Other assets (c) — — 9 9 (a) Represents carrying value of loans for which adjustments are required to be based on the appraised value of the collateral less estimated costs to sell. Write-downs on these loans are recognized as part of provision for credit losses. (b) Represents the fair value and related losses of foreclosed properties that were measured subsequent to their initial classification as OREO. Balance excludes OREO related to government insured mortgages. (c) Represents tax credit investments accounted for under the equity method. For assets measured on a nonrecurring basis which were still held on the Consolidated Balance Sheets at period end, the following table provides information about the fair value adjustments recorded during the three and nine months ended September 30, 2021 and 2020: Net gains (losses) Net gains (losses) (Dollars in millions) 2021 2020 2021 2020 Loans held for sale—SBAs and USDA $ (2) $ (2) $ (3) $ (3) Loans and leases (a) (9) (17) (12) (31) OREO (b) — — (1) — Other assets (c) (2) — (2) (1) $ (13) $ (19) $ (18) $ (35) (a) Write-downs on these loans are recognized as part of provision for credit losses. (b) Represents the fair value and related losses of foreclosed properties that were measured subsequent to their initial classification as OREO. Balance excludes OREO related to government insured mortgages. (c) Represents tax credit investments accounted for under the equity method. For the three and nine months ended September 30, 2021, FHN recognized less than $1 million of fixed asset recoveries and $33 million of fixed asset impairments, respectively, and less than $1 million of leased asset recoveries and $3 million of leased asset impairments, respectively, primarily related to continuing acquisition integration efforts associated with reduction of leased office space and banking center optimization. These amounts were primarily recognized in the Corporate segment. For the three and nine months ended September 30, 2020, FHN recognized $5 million and $6 million of fixed asset impairments, respectively, and $4 million of leased asset impairments for both periods. These amounts were primarily recognized in the Corporate segment. Lease asset impairments recognized represent the reduction in value of the right-of-use assets associated with leases that are being exited in advance of the contractual lease expiration. Impairments are measured using a discounted cash flow methodology, which is considered a Level 3 valuation. Impairments of long-lived tangible assets reflect locations where the associated land and building are either owned or leased. The fair values of owned sites were determined using estimated sales prices from appraisals and broker opinions less estimated costs to sell with adjustments upon final disposition. The fair values of owned assets in leased sites (e.g., leasehold improvements) were determined using a discounted cash flow approach, based on the revised estimated useful lives of the related assets. Both measurement methodologies are considered Level 3 valuations. Impairment adjustments recognized upon disposition of a location are considered Level 2 valuations. Level 3 Measurements The following tables provide information regarding the unobservable inputs utilized in determining the fair value of Level 3 recurring and non-recurring measurements as of September 30, 2021 and December 31, 2020: (Dollars in millions) Values Utilized Level 3 Class Fair Value at September 30, 2021 Valuation Techniques Unobservable Input Range Weighted Average (d) Available for sale securities - SBA interest-only strips $ 16 Discounted cash flow Constant prepayment rate 11% - 12% 11% Bond equivalent yield 10% 10% Loans held for sale - residential real estate $ 25 Discounted cash flow Prepayment speeds - First mortgage 4% - 12% 5% Foreclosure losses 63% - 65% 64% Loss severity trends - First mortgage 1% - 14% of UPB 8% Loans held for sale - unguaranteed interest in SBA loans $ 1 Discounted cash flow Constant prepayment rate 8% - 12% 10% Bond equivalent yield 8% 8% Derivative liabilities, other $ 16 Discounted cash flow Visa covered litigation resolution amount $5.4 billion - $6.0 billion $5.8 billion Probability of resolution scenarios 10% - 50% 16% Time until resolution 6 - 30 months 21 months Loans and leases (a) $ 86 Appraisals from comparable properties Marketability adjustments for specific properties 0% - 10% of appraisal NM Other collateral valuations Borrowing base certificates adjustment 20% - 50% of gross value NM Financial Statements/Auction values adjustment 0% - 25% of reported value NM OREO (b) $ 6 Appraisals from comparable properties Adjustment for value changes since appraisal 0% - 10% of appraisal NM Other assets (c) $ 10 Discounted cash flow Adjustments to current sales yields for specific properties 0% - 15% adjustment to yield NM Appraisals from comparable properties Marketability adjustments for specific properties 0% - 25% of appraisal NM NM - Not meaningful (a) Represents carrying value of loans for which adjustments are required to be based on the appraised value of the collateral less estimated costs to sell. Write-downs on these loans are recognized as part of provision for credit losses. (b) Represents the fair value of foreclosed properties that were measured subsequent to their initial classification as OREO. Balance excludes OREO related to government insured mortgages. (c) Represents tax credit investments accounted for under the equity method. (d) Weighted averages are determined by the relative fair value of the instruments or the relative contribution to an instrument's fair value. (Dollars in millions) Values Utilized Level 3 Class Fair Value at December 31, 2020 Valuation Techniques Unobservable Input Range Weighted Average (d) Available for sale securities - SBA interest-only strips $ 32 Discounted cash flow Constant prepayment rate 12% 12% Bond equivalent yield 15% - 17% 15% Loans held for sale - residential real estate $ 13 Discounted cash flow Prepayment speeds - First mortgage 5% - 15% 5% Foreclosure losses 59% - 70% 63% Loss severity trends - First mortgage 3% - 19% of UPB 12% Loans held for sale - unguaranteed interest in SBA loans $ 1 Discounted cash flow Constant prepayment rate 8% - 12% 10% Bond equivalent yield 7% - 8% 7% Loans held for investment $ 16 Discounted cash flow Constant prepayment rate 0% - 26% 11% Constant default rate 0% - 14% 1% Loss severity trends 0% - 100% 11% Derivative liabilities, other $ 14 Discounted cash flow Visa covered litigation resolution amount $5.4 billion - $6.0 billion $5.8 billion Probability of resolution scenarios 10% - 50% 16% Time until resolution 3 - 27 months 19 months Loans and leases (a) $ 77 Appraisals from comparable properties Marketability adjustments for specific properties 0% - 10% of appraisal NM Other collateral valuations Borrowing base certificates adjustment 20% - 50% of gross value NM Financial Statements/Auction values adjustment 0% - 25% of reported value NM OREO (b) $ 15 Appraisals from comparable properties Adjustment for value changes since appraisal 0% - 10% of appraisal NM Other assets (c) $ 9 Discounted cash flow Adjustments to current sales yields for specific properties 0% - 15% adjustment to yield NM Appraisals from comparable properties Marketability adjustments for specific properties 0% - 25% of appraisal NM NM - Not meaningful (a) Represents carrying value of loans for which adjustments are required to be based on the appraised value of the collateral less estimated costs to sell. Write-downs on these loans are recognized as part of provision for credit losses. (b) Represents the fair value of foreclosed properties that were measured subsequent to their initial classification as OREO. Balance excludes OREO related to government insured mortgages. (c) Represents tax credit investments accounted for under the equity method. (d) Weighted averages are determined by the relative fair value of the instruments or the relative contribution to an instrument's fair value. Securities AFS . Increases (decreases) in estimated prepayment rates and bond equivalent yields negatively (positively) affect the value of SBA interest-only strips. Management additionally considers whether the loans underlying related SBA interest-only strips are delinquent, in default or prepaying, and adjusts the fair value down 20 - 100% depending on the length of time in default. Loans held for sale. Foreclosure losses and prepayment rates are significant unobservable inputs used in the fair value measurement of FHN’s residential real estate loans held for sale. Loss severity trends are also assessed to evaluate the reasonableness of fair value estimates resulting from discounted cash flows methodologies as well as to estimate fair value for newly repurchased loans and loans that are near foreclosure. Significant increases (decreases) in any of these inputs in isolation would result in significantly lower (higher) fair value measurements. All observable and unobservable inputs are re-assessed quarterly. Increases (decreases) in estimated prepayment rates and bond equivalent yields negatively (positively) affect the value of unguaranteed interests in SBA loans. Unguaranteed interest in SBA loans held for sale are carried at less than the outstanding balance due to credit risk estimates. Credit risk adjustments may be reduced if prepayment is likely or as consistent payment history is realized. Management also considers other factors such as delinquency or default and adjusts the fair value accordingly. Loans held for investment. Constant prepayment rate, constant default rate and loss severity trends are significant unobservable inputs used in the fair value measurement of loans held for investment. Increases (decreases) in each of these inputs in isolation result in negative (positive) effects on the valuation of the associated loans. Derivative liabilities. In conjunction with pre-2020 sales of Visa Class B shares, FHN and the purchasers entered into derivative transactions whereby FHN will make, or receive, cash payments whenever the conversion ratio of the Visa Class B shares into Visa Class A shares is adjusted. FHN uses a discounted cash flow methodology in order to estimate the fair value of FHN’s derivative liabilities associated with its prior sales of Visa Class B shares. The methodology includes estimation of both the resolution amount for Visa’s Covered Litigation matters as well as the length of time until the resolution occurs. Significant increases (decreases) in either of these inputs in isolation would result in significantly higher (lower) fair value measurements for the derivative liabilities. Additionally, FHN performs a probability weighted multiple resolution scenario to calculate the estimated fair value of these derivative liabilities. Assignment of higher (lower) probabilities to the larger potential resolution scenarios would result in an increase (decrease) in the estimated fair value of the derivative liabilities. Since this estimation process requires application of judgment in developing significant unobservable inputs used to determine the possible outcomes and the probability weighting assigned to each scenario, these derivatives have been classified within Level 3 in fair value measurements disclosures. Loans and leases and Other Real Estate Owned. Collateral-dependent loans and OREO are primarily valued using appraisals based on sales of comparable properties in the same or similar markets. Other collateral (receivables, inventory, equipment, etc.) is valued through borrowing base certificates, financial statements and/or auction valuations. These valuations are discounted based on the quality of reporting, knowledge of the marketability/collectability of the collateral and historical disposition rates. Other assets – tax credit investments. The estimated fair value of tax credit investments accounted for under the equity method is generally determined in relation to the yield (i.e., future tax credits to be received) an acquirer of these investments would expect in relation to the yields experienced on current new issue and/or secondary market transactions. Thus, as tax credits are recognized, the future yield to a market participant is reduced, resulting in consistent impairment of the individual investments. Individual investments are reviewed for impairment quarterly, which may include the consideration of additional marketability discounts related to specific investments which typically includes consideration of the underlying property’s appraised value. Fair Value Option FHN has elected the fair value option on a prospective basis for substantially all types of mortgage loans originated for sale purposes except for mortgage origination operations which utilize the platform acquired from CBF in 2017. FHN determined that the election reduces certain timing differences and better matches changes in the value of such loans with changes in the value of derivatives and forward delivery commitments used as economic hedges for these assets at the time of election. Repurchased loans relating to mortgage banking operations conducted prior to the IBKC merger are recognized within loans held for sale at fair value at the time of repurchase, which includes consideration of the credit status of the loans and the estimated liquidation value. FHN has elected to continue recognition of these loans at fair value in periods subsequent to reacquisition. Due to the credit-distressed nature of the vast majority of repurchased loans and the related loss severities experienced upon repurchase, FHN believes that the fair value election provides a more timely recognition of changes in value for these loans that occur subsequent to repurchase. Absent the fair value election, these loans would be subject to valuation at the LOCOM value, which would prevent subsequent values from exceeding the initial fair value, determined at the time of repurchase, but would require recognition of subsequent declines in value. Thus, the fair value election provides for a more timely recognition of any potential future recoveries in asset values while not affecting the requirement to recognize subsequent declines in value. FHN also had a portion of mortgage loans held for investment for which the fair value option was elected upon origination and which were accounted for at fair value. This portion of mortgage loans held for investment at fair value option was transferred to the loans held for sale portfolio on April 1, 2021. The following tables reflect the differences between the fair value carrying amount of residential real estate loans held for sale and held for investment measured at fair value in accordance with management’s election and the aggregate unpaid principal amount FHN is contractually entitled to receive at maturity. September 30, 2021 (Dollars in millions) Fair value Aggregate Fair value carrying amount Residential real estate loans held for sale reported at fair value: Total loans $ 301 $ 305 $ (4) Nonaccrual loans 4 7 (3) Loans 90 days or more past due and still accruing 1 1 — December 31, 2020 (Dollars in millions) Fair value Aggregate Fair value carrying amount Residential real estate loans held for sale reported at fair value: Total loans $ 405 $ 442 $ (37) Nonaccrual loans 2 5 (3) Loans held for investment reported at fair value: Total loans 16 17 (1) Nonaccrual loans 1 1 — Assets and liabilities accounted for under the fair value election are initially measured at fair value with subsequent changes in fair value recognized in earnings. Such changes in the fair value of assets and liabilities for which FHN elected the fair value option are included in current period earnings with classification in the income statement line item reflected in the following table: Three Months Ended Nine Months Ended (Dollars in millions) 2021 2020 2021 2020 Changes in fair value included in net income: Mortgage banking and title income Loans held for sale $ (3) $ 2 $ (8) $ 3 For the three and nine months ended September 30, 2021 and 2020, the amount for residential real estate loans held for sale included an insignificant amount of gains in pretax earnings that is attributable to changes in instrument-specific credit risk. The portion of the fair value adjustments related to credit risk was determined based on estimated default rates and estimated loss severities. Interest income on residential real estate loans held for sale measured at fair value is calculated based on the note rate of the loan and is recorded in the interest income section of the Consolidated Statements of Income as interest on loans held for sale. FHN has elected to account for retained interest-only strips from guaranteed SBA loans recorded in available-for-sale securities at fair value through earnings. Since these securities are subject to the risk that prepayments may result in FHN not recovering all or a portion of its recorded investment, the fair value election results in a more timely recognition of the effects of estimated prepayments through earnings rather than being recognized through other comprehensive income with periodic review for other-than-temporary impairment. Gains or losses are recognized through fixed income revenues and are presented in the recurring measurements table. Determination of Fair Value Fair values are based on the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The following describes the assumptions and methodologies used to estimate the fair value of financial instruments recorded at fair value in the Consolidated Balance Sheets and for estimating the fair value of financial instruments for which fair value is disclosed. Short-term financial assets. Federal funds sold, securities purchased under agreements to resell, and interest bearing deposits with other financial institutions and the Federal Reserve are carried at historical cost. The carrying amount is a reasonable estimate of fair value because of the relatively short time between the origination of the instrument and its expected realization. Trading securities and trading liabilities. Trading securities and trading liabilities are recognized at fair value through current earnings. Trading inventory held for broker-dealer operations is included in trading securities and trading liabilities. Broker-dealer long positions are valued at bid price in the bid-ask spread. Short positions are valued at the ask price. Inventory positions are valued using observable inputs including current market transactions, benchmark yields, credit spreads, and consensus prepayment speeds. Trading loans are valued using observable inputs including current market transactions, swap rates, mortgage rates, and consensus prepayment speeds. Securities available for sale and held to maturity. Valuations of available-for-sale securities are performed using observable inputs obtained from market transactions in similar securities. Typical inputs include benchmark yields, consensus prepayment speeds, and credit spreads. Trades from similar securities and broker quotes are used to support these valuations. Interest-only strips are valued at elected fair value based on an income approach using an internal valuation model. The internal valuation model includes assumptions regarding projections of future cash flows, prepayment rates, default rates and interest-only strip terms. These securities bear the risk of loan prepayment or default that may result in FHN not recovering all or a portion of its recorded investment. When appropriate, valuations are adjusted for various factors including default or prepayment status of the underlying SBA loans. Because of the inherent uncertainty of valuation, those estimated values may be higher or lower than the values that would have been used had a ready market for the securities existed, and may change in the near term. Loans held for sale. FHN determines the fair value of loans held for sale using either current transaction prices or discounted cash flow models. Fair values are determined using current transaction prices and/or values on similar assets when available, including committed bids for specific loans or loan portfolios. Uncommitted bids may be adjusted based on other available market information. Fair value of residential real estate loans held for sale determined using a discounted cash flow model incorporates both observable and unobservable inputs. Inputs in the discounted cash flow model include current mortgage rates for similar products, estimated prepayment rates, foreclosure losses, and various loan performance measures (delinquency, LTV, credit score). Adjustments for delinquency and other differences in loan characteristics are typically reflected in the model’s discount rates. Loss severity trends and the value of underlying collateral are also considered in assessing the appropriate fair value for severely delinquent loans and loans in foreclosure. The valuation of HELOCs also incorporates estimated cancellation rates for loans expected to become delinquent. Non-mortgage consumer loans held for sale are valued using committed bids for specific loans or loan portfolios or current market pricing for similar assets with adjustments for differences in credit standing (delinquency, historical default rates for similar loans), yield, collateral values and prepayment rates. If pricing for similar assets is not available, a discounted cash flow methodology is utilized, which incorporates all of these factors into an estimate of investor required yield for the discount rate. FHN utilizes quoted market prices of similar instruments or broker and dealer quotations to value the SBA and USDA guaranteed loans. FHN values SBA-unguaranteed interests in loans held for sale based on individual loan characteristics, such as industry type and pay history which generally follows an income approach. Furthermore, these valuations are adjusted for changes in prepayment estimates and are reduced due to restrictions on trading. The fair value of other non-residential real estate loans held for sale is approximated by their carrying values based on current transaction values. Mortgage loans held for investment at fair value option. The fair value of mortgage loans held for investment at fair value option is determined by a third party using a discounted cash flow model using various assumptions about future loan performance (constant prepayment rate, constant default rate and loss severity trends) and market discount rates. Loans held for investment. The fair values of mortgage loans held for investment (other than at fair value option) are estimated using an exit price methodology that is based on present values using the interest rate that would be charged for a similar loan to a borrower with similar risk, weighted for varying maturity dates and adjusted for a liquidity discount based on the estimated time period to complete a sale transaction with a market participant. Other loans and leases held for investment are valued based on present values using the interest rate that would be charged for a similar instrument to a borrower with similar risk, applicable to each category of instruments, and adjusted for a liquidity discount based on the estimated time period to complete a sale transaction with a market participant. For loans measured using the estimated fair value of collateral less costs to sell, fair value is estimated using appraisals of the collateral. Collateral values are monitored and additional write-downs are recognized if it is determi

Basis of Presentation and Acc_2

Basis of Presentation and Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis Of Accounting	The accompanying unaudited consolidated financial statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all information and notes necessary for complete financial statements in accordance with GAAP. In the opinion of management, the accompanying unaudited consolidated financial statements contain all significant adjustments, consisting of normal and recurring items, considered necessary for fair presentation. These interim financial statements should be read in conjunction with FHN's audited consolidated financial statements and notes in FHN's Annual Report on Form 10-K for the year ended December 31, 2020. Operating results for the interim period are not necessarily indicative of the results that may be expected for the full year. All significant intercompany balances and transactions have been eliminated in consolidation. Certain amounts reported in prior years have been reclassified to conform to the current period presentation. See the Glossary of Acronyms and Terms included in this Report for terms used herein.
Accounting Changes With Extended Transition Periods	Accounting Changes With Extended Transition Periods In March 2020, the FASB issued ASU 2020-04, “Facilitation of the Effects of Reference Rate Reform on Financial Reporting” which provides several optional expedients and exceptions to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. The provisions of ASU 2020-04 primarily affect 1) contract modifications (e.g., loans, leases, debt, and derivatives) made in anticipation that a reference rate (e.g., LIBOR) will be discontinued and 2) the application of hedge accounting for existing relationships affected by those modifications. The provisions of ASU 2020-04 are effective upon release and apply only to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The expedients and exceptions provided by ASU 2020-04 do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. FHN has identified contracts affected by reference rate reform and developed modification plans for those contracts. FHN has elected to utilize the optional expedients and exceptions provided by ASU 2020-04 for certain contract modifications that have already been implemented. FHN anticipates that it will continue to utilize the expedients and exceptions for future modifications in situations where they mitigate potential accounting outcomes that do not faithfully represent management’s intent or risk management activities, consistent with the purpose of the standard. In January 2021, the FASB issued ASU 2021-01, "Scope" to expand the scope of ASU 2020-04 to apply to certain contract modifications that were implemented in October 2020 by derivative clearinghouses for the use of Secure Overnight Funding Rate (SOFR) in discounting, margining and price alignment for centrally cleared derivatives, including derivatives utilized in hedging relationships. ASU 2021-01 also applies to derivative contracts affected by the change in discounting convention regardless of whether they are centrally cleared (i.e., bi-lateral contracts can also be modified) and regardless of whether they reference LIBOR. ASU 2021-01 was effective immediately upon issuance with retroactive application permitted. FHN elected to retroactively apply the provisions of ASU 2021-01 because FHN's centrally cleared derivatives were affected by the change in discounting convention and because FHN has other bi-lateral derivative contracts that may be modified to conform to the use of SOFR for discounting. Adoption did not have a significant effect on FHN's reported financial condition or results of operations.

Acquisitions and Divestitures (

Acquisitions and Divestitures (Tables)	9 Months Ended
	Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Schedule of Business Acquisitions, by Acquisition	The following schedule details the allocation of merger consideration to the valuations of the identifiable tangible and intangible assets acquired and liabilities assumed from IBKC as of July 1, 2020. (Dollars in millions) IBERIABANK Corporation Assets: Cash and due from banks $ 395 Interest-bearing deposits with banks 1,683 Securities available for sale at fair value 3,544 Loans held for sale 320 Loans and leases (a) 25,921 Allowance for loan and lease losses (284) Other intangible assets 240 Premises and equipment 311 OREO 9 Other assets 1,153 Total assets acquired $ 33,292 Liabilities: Deposits $ 28,232 Short-term borrowings 209 Term borrowings 1,200 Other liabilities 618 Total liabilities assumed $ 30,259 Net assets acquired $ 3,033 Consideration paid: Consideration for outstanding common stock $ 2,243 Consideration for equity awards 28 Consideration for preferred stock 231 Total consideration paid $ 2,502 Purchase accounting gain $ (531) (a) Includes $1.3 billion of initial net investments in sales-type and direct financing leases.
Schedule of Merger and Integration Expense	Total merger and integration expense recognized for the three and nine months ended September 30, 2021 and 2020 are presented in the following table: Three Months Ended Nine Months Ended (Dollars in millions) 2021 2020 2021 2020 Personnel expense (a) $ 10 $ 35 $ 47 $ 41 Legal and professional fees (b) 9 31 15 38 Contribution expense (c) — 20 — 20 Other expense (d) 27 15 85 22 Total $ 46 $ 101 $ 147 $ 121 Certain previously reported amounts have been reclassified to agree with current presentation. (a) Primarily comprised of fees for severance and retention. (b) Primarily comprised of fees for legal, accounting, and merger consultants. (c) Comprised of contribution expense related to the establishment of the First Horizon Louisiana Foundation.

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2021
Marketable Securities [Abstract]
Schedule of FHN's Investment Securities	The following tables summarize FHN’s investment securities as of September 30, 2021 and December 31, 2020: September 30, 2021 (Dollars in millions) Amortized Gross Gross Fair Securities available for sale: U.S. treasuries $ 603 $ — $ — $ 603 Government agency issued MBS 4,324 58 (37) 4,345 Government agency issued CMO 2,234 14 (31) 2,217 Other U.S. government agencies 794 6 (12) 788 States and municipalities 516 10 (1) 525 $ 8,471 $ 88 $ (81) 8,478 AFS securities recorded at fair value through earnings: SBA interest-only strips (a) 16 Total securities available for sale (b) $ 8,494 Securities held to maturity: Government agency issued MBS $ 229 $ — $ (1) $ 228 Government agency issued CMO 75 — — 75 Total securities held to maturity $ 304 $ — $ (1) $ 303 (a) SBA interest-only strips are recorded at elected fair value. See Note 17 - Fair Value of Assets and Liabilities for additional information. (b) Includes $7.5 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes. December 31, 2020 (Dollars in millions) Amortized Gross Gross Fair Securities available for sale: U.S. treasuries $ 613 $ — $ — $ 613 Government agency issued MBS 3,722 92 (2) 3,812 Government agency issued CMO 2,380 29 (3) 2,406 Other U.S. government agencies 672 12 — 684 Corporate and other debt 40 1 (1) 40 States and municipalities 445 15 — 460 $ 7,872 $ 149 $ (6) 8,015 AFS securities recorded at fair value through earnings: SBA interest-only strips (a) 32 Total securities available for sale (b) $ 8,047 Securities held to maturity: Corporates and other debt $ 10 $ — $ — $ 10 Total securities held to maturity $ 10 $ — $ — $ 10 (a) SBA interest-only strips are recorded at elected fair value. See Note 17 - Fair Value of Assets and Liabilities for additional information. (b) Includes $6.4 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
Schedule of Amortized Cost And Fair Value By Contractual Maturity	The amortized cost and fair value by contractual maturity for the debt securities portfolio as of September 30, 2021 is provided below: Held to Maturity Available for Sale (Dollars in millions) Amortized Fair Amortized Fair Within 1 year $ — $ — $ 654 $ 654 After 1 year through 5 years — — 152 153 After 5 years through 10 years — 347 355 After 10 years — — 760 770 Subtotal — — 1,913 1,932 Government agency issued MBS and CMO (a) 304 303 6,558 6,562 Total $ 304 $ 303 $ 8,471 $ 8,494 (a) Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
Schedule of Investments Within The Available For Sale Portfolio That Had Unrealized Losses	The following tables provide information on investments within the available-for-sale portfolio that had unrealized losses as of September 30, 2021 and December 31, 2020: As of September 30, 2021 Less than 12 months 12 months or longer Total (Dollars in millions) Fair Unrealized Fair Unrealized Fair Unrealized Government agency issued MBS $ 2,101 $ (33) $ 99 $ (4) $ 2,200 $ (37) Government agency issued CMO 1,243 (25) 179 (6) 1,422 (31) Other U.S. government agencies 495 (12) — — 495 (12) States and municipalities 107 (1) — — 107 (1) Total $ 3,946 $ (71) $ 278 $ (10) $ 4,224 $ (81) As of December 31, 2020 Less than 12 months 12 months or longer Total (Dollars in millions) Fair Unrealized Fair Unrealized Fair Unrealized U.S. treasuries $ 307 $ — $ — $ — $ 307 $ — Government agency issued MBS 426 (2) — — 426 (2) Government agency issued CMO 586 (3) — — 586 (3) Other U.S. government agencies 80 (1) — — 80 (1) States and municipalities 1 — — — 1 — Total $ 1,400 $ (6) $ — $ — $ 1,400 $ (6)

Loans and Leases (Tables)

Loans and Leases (Tables)	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Schedule Of Loans By Portfolio Segment	The following table provides the amortized cost basis of loans and leases by portfolio segment and class as of September 30, 2021 and December 31, 2020, excluding accrued interest of $143 million and $180 million, respectively, which is included in other assets in the Consolidated Balance Sheets. (Dollars in millions) September 30, 2021 December 31, 2020 Commercial: Commercial and industrial (a) (b) $ 26,377 $ 27,700 Loans to mortgage companies 5,139 5,404 Total commercial, financial, and industrial 31,516 33,104 Commercial real estate 12,194 12,275 Consumer: HELOC 2,041 2,420 Real estate installment loans 8,746 9,305 Total consumer real estate 10,787 11,725 Credit card and other 938 1,128 Loans and leases $ 55,435 $ 58,232 Allowance for loan and lease losses (734) (963) Net loans and leases $ 54,701 $ 57,269 (a) Includes equipment financing leases of $719 million and $587 million, respectively, as of September 30, 2021 and December 31, 2020. (b) Includes PPP loans fully guaranteed by the SBA of $2.0 billion and $4.1 billion as of September 30, 2021 and December 31, 2020, respectively.
Financing Receivable Credit Quality Indicators	The following tables provide the amortized cost basis of the commercial loan portfolio by year of origination and credit quality indicator as of September 30, 2021 and December 31, 2020: September 30, 2021 C&I (Dollars in millions) 2021 2020 2019 2018 2017 Prior to 2017 LMC (a) Revolving Revolving Total Credit Quality Indicator: Pass (PD grades 1 through 12) (c) $ 5,822 $ 4,208 $ 3,809 $ 1,682 $ 1,294 $ 2,551 $ 5,139 $ 5,972 $ 13 $ 30,490 Special Mention (PD grade 13) 20 37 74 59 38 48 — 154 4 434 Substandard, Doubtful, or Loss (PD grades 14,15, and 16) 41 111 74 106 30 53 — 129 48 592 Total C&I loans $ 5,883 $ 4,356 $ 3,957 $ 1,847 $ 1,362 $ 2,652 $ 5,139 $ 6,255 $ 65 $ 31,516 (a) LMC includes non-revolving commercial lines of credit to qualified mortgage companies primarily for the temporary warehousing of eligible mortgage loans prior to the borrower's sale of those mortgage loans to third party investors. The loans are of short duration with maturities less than one year. (b) C&I loans converted from revolving to term in 2021 were not material. (c) 2021 and 2020 balances include PPP loans. December 31, 2020 C&I (Dollars in millions) 2020 2019 2018 2017 2016 Prior to 2016 LMC (a) Revolving Revolving Total Credit Quality Indicator: Pass (PD grades 1 through 12) (c) $ 9,060 $ 5,138 $ 2,628 $ 1,748 $ 1,161 $ 2,145 $ 5,404 $ 4,571 $ 60 $ 31,915 Special Mention (PD grade 13) 89 93 70 31 37 64 — 127 1 512 Substandard, Doubtful, or Loss (PD grades 14,15, and 16) 182 77 114 50 42 58 — 95 59 677 Total C&I loans $ 9,331 $ 5,308 $ 2,812 $ 1,829 $ 1,240 $ 2,267 $ 5,404 $ 4,793 $ 120 $ 33,104 (a) LMC includes non-revolving commercial lines of credit to qualified mortgage companies primarily for the temporary warehousing of eligible mortgage loans prior to the borrower's sale of those mortgage loans to third party investors. The loans are of short duration with maturities less than one year. (b) $50 million of C&I loans were converted from revolving to term in 2020. (c) 2020 balances include PPP loans. September 30, 2021 CRE (Dollars in millions) 2021 2020 2019 2018 2017 Prior to 2017 Revolving Revolving Loans Converted to Term Loans Total Credit Quality Indicator: Pass (PD grades 1 through 12) $ 2,216 $ 2,264 $ 2,814 $ 1,208 $ 806 $ 2,054 $ 259 $ — $ 11,621 Special Mention (PD grade 13) 4 26 50 171 69 91 — — 411 Substandard, Doubtful, or Loss (PD grades 14,15, and 16) 10 17 12 16 38 44 25 — 162 Total CRE loans $ 2,230 $ 2,307 $ 2,876 $ 1,395 $ 913 $ 2,189 $ 284 $ — $ 12,194 December 31, 2020 CRE (Dollars in millions) 2020 2019 2018 2017 2016 Prior to 2016 Revolving Revolving Loans Converted to Term Loans Total Credit Quality Indicator: Pass (PD grades 1 through 12) $ 2,477 $ 3,311 $ 1,750 $ 1,140 $ 946 $ 1,800 $ 259 $ 19 $ 11,702 Special Mention (PD grade 13) 48 24 117 75 71 54 — — 389 Substandard, Doubtful, or Loss (PD grades 14,15, and 16) 30 13 21 42 27 33 18 — 184 Total CRE loans $ 2,555 $ 3,348 $ 1,888 $ 1,257 $ 1,044 $ 1,887 $ 277 $ 19 $ 12,275 September 30, 2021 Consumer Real Estate (Dollars in millions) 2021 2020 2019 2018 2017 Prior to 2017 Revolving Revolving Total FICO score 740 or greater $ 1,037 $ 1,085 $ 844 $ 500 $ 682 $ 1,692 $ 1,104 $ 130 $ 7,074 FICO score 720-739 135 143 111 78 107 119 164 24 881 FICO score 700-719 98 109 78 55 117 131 146 25 759 FICO score 660-699 99 137 101 97 148 147 215 48 992 FICO score 620-659 15 33 51 23 65 67 71 31 356 FICO score less than 620 226 52 30 41 193 100 48 35 725 Total $ 1,610 $ 1,559 $ 1,215 $ 794 $ 1,312 $ 2,256 $ 1,748 $ 293 $ 10,787 (a) $34 million of HELOC loans were converted from revolving to term in 2021. December 31, 2020 Consumer Real Estate (Dollars in millions) 2020 2019 2018 2017 2016 Prior to 2016 Revolving Revolving Loans Converted to Term Loans Total FICO score 740 or greater $ 1,186 $ 1,167 $ 703 $ 610 $ 674 $ 1,719 $ 1,275 $ 159 $ 7,493 FICO score 720-739 157 158 100 77 92 197 186 29 996 FICO score 700-719 122 107 78 76 73 221 177 34 888 FICO score 660-699 130 141 123 75 85 296 264 59 1,173 FICO score 620-659 45 61 37 28 35 127 92 36 461 FICO score less than 620 107 36 52 54 95 261 61 48 714 Total $ 1,747 $ 1,670 $ 1,093 $ 920 $ 1,054 $ 2,821 $ 2,055 $ 365 $ 11,725 The following tables reflect the amortized cost basis by year of origination and refreshed FICO scores for credit card and other loans as of September 30, 2021 and December 31, 2020. September 30, 2021 Credit Card and Other (Dollars in millions) 2021 2020 2019 2018 2017 Prior to 2017 Revolving Revolving Total FICO score 740 or greater $ 55 $ 38 $ 33 $ 27 $ 18 $ 70 $ 212 $ 5 $ 458 FICO score 720-739 9 6 5 4 4 20 39 2 89 FICO score 700-719 6 6 5 5 4 24 42 1 93 FICO score 660-699 22 7 6 7 6 33 93 2 176 FICO score 620-659 3 3 3 4 3 19 21 1 57 FICO score less than 620 12 5 3 5 4 18 16 2 65 Total $ 107 $ 65 $ 55 $ 52 $ 39 $ 184 $ 423 $ 13 $ 938 (a) $4 million of other consumer loans were converted from revolving to term in 2021. December 31, 2020 Credit Card and Other (Dollars in millions) 2020 2019 2018 2017 2016 Prior to 2016 Revolving Revolving Loans Converted to Term Loans Total FICO score 740 or greater $ 57 $ 52 $ 59 $ 37 $ 23 $ 116 $ 159 $ 5 $ 508 FICO score 720-739 7 7 9 8 8 27 91 2 159 FICO score 700-719 9 8 9 8 4 38 37 3 116 FICO score 660-699 30 12 15 9 9 48 46 3 172 FICO score 620-659 5 5 7 5 10 24 20 1 77 FICO score less than 620 14 7 8 11 9 26 20 1 96 Total $ 122 $ 91 $ 107 $ 78 $ 63 $ 279 $ 373 $ 15 $ 1,128
Accruing And Non-Accruing Loans By Class	The following table reflects accruing and non-accruing loans and leases by class on September 30, 2021 and December 31, 2020: September 30, 2021 Accruing Non-Accruing (Dollars in millions) Current 30-89 90+ Total Current 30-89 90+ Total Total Commercial, financial, and industrial: C&I (a) $ 26,196 $ 36 $ 1 $ 26,233 $ 119 $ 9 $ 16 $ 144 $ 26,377 Loans to mortgage companies 5,139 — — 5,139 — — — — 5,139 Total commercial, financial, and industrial 31,335 36 1 31,372 119 9 16 144 31,516 Commercial real estate: CRE (b) 12,120 15 1 12,136 8 — 50 58 12,194 Consumer real estate: HELOC (c) 1,979 5 7 1,991 37 2 11 50 2,041 Real estate installment loans (d) 8,625 23 5 8,653 51 4 38 93 8,746 Total consumer real estate 10,604 28 12 10,644 88 6 49 143 10,787 Credit card and other: Credit card 274 3 2 279 — — — — 279 Other 656 1 — 657 — 1 1 2 659 Total credit card and other 930 4 2 936 — 1 1 2 938 Total loans and leases $ 54,989 $ 83 $ 16 $ 55,088 $ 215 $ 16 $ 116 $ 347 $ 55,435 (a) $129 million of C&I loans are nonaccrual loans that have been specifically reviewed for impairment with no related allowance. (b) $52 million of CRE loans are nonaccrual loans that have been specifically reviewed for impairment with no related allowance. (c) $7 million of HELOC loans are nonaccrual loans that have been specifically reviewed for impairment with no related allowance. (d) $52 million of real estate installment loans are nonaccrual loans that have been specifically reviewed for impairment with no related allowance. December 31, 2020 Accruing Non-Accruing (Dollars in millions) Current 30-89 90+ Total Current 30-89 90+ Total Total Commercial, financial, and industrial: C&I (a) $ 27,541 $ 15 $ — $ 27,556 $ 88 $ 12 $ 44 $ 144 $ 27,700 Loans to mortgage companies 5,404 — — 5,404 — — — — 5,404 Total commercial, financial, and industrial 32,945 15 — 32,960 88 12 44 144 33,104 Commercial real estate: CRE 12,194 23 — 12,217 10 42 6 58 12,275 Consumer real estate: HELOC 2,336 13 11 2,360 43 3 14 60 2,420 Real estate installment loans 9,138 40 5 9,183 63 9 50 122 9,305 Total consumer real estate 11,474 53 16 11,543 106 12 64 182 11,725 Credit card and other: Credit card 279 3 1 283 — — — — 283 Other 838 6 — 844 1 — 1 2 845 Total credit card and other 1,117 9 1 1,127 1 — 1 2 1,128 Total loans and leases, net of unearned income $ 57,730 $ 100 $ 17 $ 57,847 $ 205 $ 66 $ 115 $ 386 $ 58,232
Schedule Of Troubled Debt Restructurings Occurring During The Year	The following tables present the end of period balance for loans modified in a TDR during the periods indicated: Three Months Ended September 30, 2021 Three Months Ended September 30, 2020 (Dollars in millions) Number Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment C&I 5 $ 8 $ 7 83 $ 130 $ 120 CRE — — — 14 12 12 HELOC 2 — — 35 3 2 Real estate installment loans 6 — — 44 6 6 Credit card and other 8 — — 10 — — Total TDRs 21 $ 8 $ 7 186 $ 151 $ 140 Nine Months Ended September 30, 2021 Nine Months Ended September 30, 2020 (Dollars in millions) Number Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment C&I 32 $ 37 $ 34 87 $ 141 $ 129 CRE 1 12 10 14 12 12 HELOC 21 2 2 47 4 4 Real estate installment loans 41 8 8 94 15 15 Credit card and other 36 — — 50 — — Total TDRs 131 $ 59 $ 54 292 $ 172 $ 160
Schedule Of Troubled Debt Restructurings Within The Previous 12 Months	The following tables present TDRs which re-defaulted during the three and nine months ended September 30, 2021 and 2020, a nd as to which the modification occurred 12 months or less prior to the re-default. For purposes of this disclosure, FHN generally defines payment default as 30 or more days past due. Three Months Ended September 30, 2021 Three Months Ended September 30, 2020 (Dollars in millions) Number Recorded Number Recorded C&I 6 $ 3 — $ — CRE 4 10 — — HELOC — — 1 — Real estate installment loans 1 1 6 1 Credit card and other 1 — 7 — Total TDRs 12 $ 14 14 $ 1 Nine Months Ended September 30, 2021 Nine Months Ended September 30, 2020 (Dollars in millions) Number Recorded Number Recorded C&I 18 $ 5 — $ — CRE 6 19 — — HELOC 1 — 8 — Real estate installment loans 8 4 16 1 Credit card and other 2 — 21 — Total TDRs 35 $ 28 45 $ 1

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Rollforward Of The Allowance For Loan Losses By Portfolio Segment	The following table provides a rollforward of the ALLL and RULC by portfolio type for the three and nine months ended September 30, 2021 and 2020: (Dollars in millions) Commercial, Financial, and Industrial (a) Commercial Real Estate Consumer Real Estate Credit Card and Other Total Allowance for loan and lease losses: Balance as of July 1, 2021 $ 385 $ 210 $ 203 $ 17 $ 815 Charge-offs (11) (2) (1) (5) (19) Recoveries 7 2 7 — 16 Provision for loan and lease losses (7) (48) (30) 7 (78) Balance as of September 30, 2021 $ 374 $ 162 $ 179 $ 19 $ 734 Balance as of July 1, 2020 $ 319 $ 57 $ 144 $ 18 $ 538 Initial allowance on loans purchased with credit deterioration 138 100 44 5 287 Charge-offs (69) (4) (2) (3) (78) Recoveries 3 2 5 1 11 Provision for loan losses 98 53 74 5 230 Balance as of September 30, 2020 $ 489 $ 208 $ 265 $ 26 $ 988 Reserve for remaining unfunded commitments: Balance as of July 1, 2021 $ 57 $ 9 $ 9 $ — $ 75 Provision for remaining unfunded commitments (8) 1 — — (7) Balance as of September 30, 2021 $ 49 $ 10 $ 9 $ — $ 68 Balance as of July 1, 2020 $ 37 $ 6 $ 8 $ — $ 51 Initial reserve on loans acquired 12 26 3 — 41 Provision for remaining unfunded commitments (2) (1) — — (3) Balance as of September 30, 2020 $ 47 $ 31 $ 11 $ — $ 89 Allowance for loan and lease losses: Balance as of January 1, 2021 $ 453 $ 242 $ 242 $ 26 $ 963 Charge-offs (27) (5) (5) (11) (48) Recoveries 18 5 21 3 47 Provision for loan and lease losses (70) (80) (79) 1 (228) Balance as of September 30, 2021 $ 374 $ 162 $ 179 $ 19 $ 734 Balance as of January 1, 2020, as adjusted (b) $ 142 $ 29 $ 121 $ 15 $ 307 Initial allowance on loans purchased with credit deterioration 138 100 44 5 287 Charge-offs (95) (4) (6) (10) (115) Recoveries 5 3 13 3 24 Provision for loan and lease losses 299 80 93 13 485 Balance as of September 30, 2020 $ 489 $ 208 $ 265 $ 26 $ 988 Reserve for remaining unfunded commitments: Balance as of January 1, 2021 $ 65 $ 10 $ 10 $ — $ 85 Provision for remaining unfunded commitments (16) — (1) — (17) Balance as of September 30, 2021 $ 49 $ 10 $ 9 $ — $ 68 Balance as of January 1, 2020, as adjusted (b) $ 21 $ 4 $ 6 $ — $ 31 Initial reserve on loans acquired 12 26 3 — 41 Provision for remaining unfunded commitments 14 1 2 — 17 Balance as of September 30, 2020 $ 47 $ 31 $ 11 $ — $ 89 (a) C&I loans as of September 30, 2021 include $2.0 billion in PPP loans which due to the government guarantee and forgiveness provisions are considered to have no credit risk and therefore have no allowance for loan and lease losses.

Mortgage Banking Activity (Tabl

Mortgage Banking Activity (Tables)	9 Months Ended
	Sep. 30, 2021
Mortgage Banking [Abstract]
Schedule of Residential Mortgage Loans Held For Sale	The following table summarizes activity relating to residential mortgage loans held for sale as of the nine months ended September 30, 2021 and the year ended December 31, 2020. (Dollars in millions) September 30, 2021 December 31, 2020 Balance at beginning of period $ 409 $ 4 Acquired — 320 Originations and purchases 2,154 2,499 Sales, net of gains (2,302) (2,405) Mortgage loans transferred from (to) held for investment 30 (9) Balance at end of period $ 291 $ 409
Schedule of Mortgage Servicing Rights	Mortgage servicing rights had the following carrying values as of the periods indicated. September 30, 2021 December 31, 2020 (Dollars in millions) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Mortgage servicing rights $ 36 $ (7) $ 29 $ 28 $ (3) $ 25

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Summary Of Gross Goodwill And Accumulated Impairment Losses And Write-Offs Detailed By Reportable Segments	The following is a summary of goodwill by reportable segment included in the Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020. (Dollars in millions) Regional Specialty Banking Total December 31, 2019 $ 802 $ 631 $ 1,433 Additions 78 — 78 December 31, 2020 $ 880 $ 631 $ 1,511 Additions and adjustments — — — September 30, 2021 $ 880 $ 631 $ 1,511
Summary Of Intangible Assets and Accumulated Amortization Included In The Consolidated Statements of Condition	The following table, which excludes fully amortized intangibles, presents other intangible assets included in the Consolidated Balance Sheets: September 30, 2021 December 31, 2020 (Dollars in millions) Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Core deposit intangibles $ 371 $ (117) $ 254 $ 371 $ (81) $ 290 Customer relationships 37 (10) 27 37 (8) 29 Other (a) 41 (11) 30 41 (6) 35 Total $ 449 $ (138) $ 311 $ 449 $ (95) $ 354 (a) Includes noncompete covenants and purchased credit card intangible assets. Also includes title plant intangible assets and state banking licenses which are not subject to amortization.

Preferred Stock (Tables)

Preferred Stock (Tables)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Schedule of Stock by Class	The following table presents a summary of FHN's non-cumulative perpetual preferred stock: (Dollars in millions) September 30, 2021 December 31, 2020 Issuance Date Earliest Redemption Date (a) Annual Dividend Rate Dividend Payments Shares Outstanding Liquidation Amount Carrying Amount Carrying Amount Series A 1/31/2013 4/10/2018 6.200 % Quarterly — $ — $ — $ 95 Series B 7/2/2020 8/1/2025 6.625 % (b) Semi-annually 8,000 80 77 77 Series C 7/2/2020 5/1/2026 6.600 % (c) Quarterly 5,750 58 59 59 Series D 7/2/2020 5/1/2024 6.100 % (d) Semi-annually 10,000 100 94 94 Series E 5/28/2020 10/10/2025 6.500 % Quarterly 1,500 150 145 145 Series F 5/3/2021 7/10/2026 4.700 % Quarterly 1,500 150 145 — 26,750 $ 538 $ 520 $ 470 (a) Denotes earliest optional redemption date. Earlier redemption is possible, at FHN's election, if certain regulatory capital events occur. (b) Fixed dividend rate will reset on August 1, 2025 to three-month LIBOR plus 4.262%. (c) Fixed dividend rate will reset on May 1, 2026 to three-month LIBOR plus 4.920%. (d) Fixed dividend rate will reset on May 1, 2024 to three-month LIBOR plus 3.859%.

Components of Other Comprehen_2

Components of Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2021
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income/(Loss)	The following table provides the changes in accumulated other comprehensive income (loss) by component, net of tax, for the three and nine months ended September 30, 2021 and 2020: (Dollars in millions) Securities AFS Cash Flow Pension and Total Balance as of July 1, 2021 $ 43 $ 8 $ (254) $ (203) Net unrealized gains (losses) (38) — (3) (41) Amounts reclassified from AOCI — (1) 4 3 Other comprehensive income (loss) (38) (1) 1 (38) Balance as of September 30, 2021 $ 5 $ 7 $ (253) $ (241) (Dollars in millions) Securities AFS Cash Flow Pension and Total Balance as of January 1, 2021 $ 108 $ 12 $ (260) $ (140) Net unrealized gains (losses) (103) (1) (4) (108) Amounts reclassified from AOCI — (4) 11 7 Other comprehensive income (loss) (103) (5) 7 (101) Balance as of September 30, 2021 $ 5 $ 7 $ (253) $ (241) (Dollars in millions) Securities AFS Cash Flow Hedges Pension and Post-retirement Plans Total Balance as of July 1, 2020 $ 118 $ 16 $ (268) $ (134) Net unrealized gains (losses) (6) (1) — (7) Amounts reclassified from AOCI 1 (2) 2 1 Other comprehensive income (loss) (5) (3) 2 (6) Balance as of September 30, 2020 $ 113 $ 13 $ (266) $ (140) (Dollars in millions) Securities AFS Cash Flow Hedges Pension and Post-retirement Plans Total Balance as of January 1, 2020 $ 31 $ 3 $ (273) $ (239) Net unrealized gains (losses) 81 14 — 95 Amounts reclassified from AOCI 1 (4) 7 4 Other comprehensive income (loss) 82 10 7 99 Balance as of September 30, 2020 $ 113 $ 13 $ (266) $ (140)
Reclassification Out Of Accumulated Other Comprehensive Income	Reclassifications from AOCI, and related tax effects, were as follows: (Dollars in millions) Three Months Ended Nine Months Ended Details about AOCI 2021 2020 2021 2020 Affected line item in the statement where net Securities AFS: Realized (gains) losses on securities AFS $ — $ 1 $ — $ 1 Securities gains (losses), net Tax expense (benefit) — — — — Income tax expense — 1 — 1 Cash Flow Hedges: Realized (gains) losses on cash flow hedges $ (2) $ (2) $ (6) $ (5) Interest and fees on loans and leases Tax expense (benefit) 1 — 2 1 Income tax expense (1) (2) (4) (4) Pension and Postretirement Plans: Amortization of prior service cost and net actuarial gain (loss) 3 3 9 9 Other expense Tax expense (benefit) 1 (1) 2 (2) Income tax expense 4 2 11 7 Total reclassification from AOCI $ 3 $ 1 $ 7 $ 4

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Schedule of Reconciliation Of Earnings/(Loss) Per Common And Diluted Share	The computations of basic and diluted earnings per common share were as follows: Three Months Ended Nine Months Ended (Dollars in millions, except per share data; shares in thousands) 2021 2020 2021 2020 Net income $ 235 $ 539 $ 781 $ 612 Net income attributable to noncontrolling interest 3 3 9 8 Net income attributable to controlling interest 232 536 772 604 Preferred stock dividends 8 13 29 16 Net income available to common shareholders $ 224 $ 523 $ 743 $ 588 Weighted average common shares outstanding—basic 545,818 549,690 549,434 391,699 Effect of dilutive securities 4,001 1,156 4,765 1,014 Weighted average common shares outstanding—diluted 549,819 550,846 554,199 392,713 Basic earnings per common share $ 0.41 $ 0.95 $ 1.35 $ 1.50 Diluted earnings per common share $ 0.41 $ 0.95 $ 1.34 $ 1.50
Schedule of Anti-Dilutive Options and Awards	The following table presents average outstanding options and other equity awards that were excluded from the calculation of diluted earnings per share because they were either anti-dilutive (the exercise price was higher than the weighted-average market price for the period) or the performance conditions have not been met: Three Months Ended Nine Months Ended (Shares in thousands) 2021 2020 2021 2020 Stock options excluded from the calculation of diluted EPS 2,901 8,306 1,431 4,564 Weighted average exercise price of stock options excluded from the calculation of diluted EPS $ 17.75 $ 15.32 $ 20.64 $ 17.05 Other equity awards excluded from the calculation of diluted EPS 2,464 6,824 1,394 4,826

Retirement Plans (Tables)

Retirement Plans (Tables)	9 Months Ended
	Sep. 30, 2021
Retirement Benefits, Description [Abstract]
Schedule of Components of Net Periodic Benefit Cost	The components of net periodic benefit cost for the three months ended September 30 were as follows: (Dollars in millions) 2021 2020 Components of net periodic benefit cost Interest cost $ 4 $ 6 Expected return on plan assets (7) (7) Amortization of unrecognized: Actuarial (gain) loss 2 3 Net periodic benefit cost $ (1) $ 2 The components of net periodic benefit cost for the nine months ended September 30 were as follows: (Dollars in millions) 2021 2020 Components of net periodic benefit cost Interest cost $ 12 $ 17 Expected return on plan assets (15) (19) Amortization of unrecognized: Actuarial (gain) loss 6 10 Other 2 — Net periodic benefit cost $ 5 $ 8

Business Segment Information (T

Business Segment Information (Tables)	9 Months Ended
	Sep. 30, 2021
Segment Reporting, Measurement Disclosures [Abstract]
Amounts Of Consolidated Revenue, Expense, Tax And Assets	The following tables reflect financial information for each reportable business segment for the three and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, 2021 (Dollars in millions) Regional Banking Specialty Banking Corporate Consolidated Net interest income (expense) $ 444 $ 154 $ (106) $ 492 Provision for credit losses (52) (33) — (85) Noninterest income 112 142 (7) 247 Noninterest expense 301 141 84 526 Income (loss) before income taxes 307 188 (197) 298 Income tax expense (benefit) 72 45 (54) 63 Net income (loss) $ 235 $ 143 $ (143) $ 235 Average assets $ 40,722 $ 20,460 $ 27,219 $ 88,401 Three Months Ended September 30, 2020 (Dollars in millions) Regional Banking Specialty Banking Corporate Consolidated Net interest income (expense) $ 448 $ 161 $ (77) $ 532 Provision for credit losses 194 34 (1) 227 Noninterest income 97 181 545 823 Noninterest expense 301 138 148 587 Income (loss) before income taxes 50 170 321 541 Income tax expense (benefit) 9 41 (48) 2 Net income (loss) $ 41 $ 129 $ 369 $ 539 Average assets $ 43,703 $ 21,693 $ 16,287 $ 81,683 Nine Months Ended September 30, 2021 (Dollars in millions) Regional Banking Specialty Banking Corporate Consolidated Net interest income (expense) $ 1,314 $ 464 $ (282) $ 1,496 Provision for credit losses (172) (61) (12) (245) Noninterest income 320 476 33 829 Noninterest expense (a) 851 441 275 1,567 Income (loss) before income taxes 955 560 (512) 1,003 Income tax expense (benefit) 223 135 (136) 222 Net income (loss) $ 732 $ 425 $ (376) $ 781 Average assets $ 41,757 $ 20,669 $ 24,705 $ 87,131 (a) Includes $35 million in asset impairments related to IBKC merger integration efforts in the Corporate segment. Nine Months Ended September 30, 2020 (Dollars in millions) Regional Banking Specialty Banking Corporate Consolidated Net interest income (expense) $ 853 $ 400 $ (113) $ 1,140 Provision for credit losses 394 106 2 502 Noninterest income 239 410 555 1,204 Noninterest expense 639 359 212 1,210 Income (loss) before income taxes 59 345 228 632 Income tax expense (benefit) 7 84 (71) 20 Net income (loss) $ 52 $ 261 $ 299 $ 612 Average assets $ 27,962 $ 18,885 $ 10,963 $ 57,810 The following tables reflect a disaggregation of FHN’s noninterest income by major product line and reportable segment for the three and nine months ended September 30, 2021 and 2020: Three months ended September 30, 2021 (Dollars in millions) Regional Banking Specialty Banking Corporate Consolidated Noninterest income: Fixed income (a) $ — $ 96 $ — $ 96 Deposit transactions and cash management 39 3 2 44 Mortgage banking and title income — 33 1 34 Brokerage, management fees and commissions 24 — — 24 Bankcard income 14 1 — 15 Trust services and investment management 13 — — 13 Securities gains (losses), net (b) — — 1 1 Loss on debt extinguishment — — (23) (23) Other income (c) 22 9 12 43 Total noninterest income $ 112 $ 142 $ (7) $ 247 (a) Includes $12 million of underwriting, portfolio advisory, and other noninterest income in scope of ASC 606, "Revenue From Contracts With Customers." (b) Represents noninterest income excluded from the scope of ASC 606. Amount is presented for informational purposes to reconcile total noninterest income. (c) Includes other service charges, ATM and interchange fees, electronic banking fees, and insurance commissions in scope of ASC 606. Three months ended September 30, 2020 (Dollars in millions) Regional Banking Specialty Banking Corporate Consolidated Noninterest income: Fixed income (a) $ — $ 111 $ — $ 111 Mortgage banking and title income — 66 — 66 Deposit transactions and cash management 38 2 2 42 Brokerage, management fees and commissions 18 — — 18 Trust services and investment management 12 — — 12 Bankcard income 10 — — 10 Securities gains (losses), net (b) — — (1) (1) Purchase accounting gain — — 532 532 Other income (c) 19 2 12 33 Total noninterest income $ 97 $ 181 $ 545 $ 823 (a) Includes $10 million of underwriting, portfolio advisory, and other noninterest income in scope of ASC 606, "Revenue From Contracts With Customers." (b) Represents noninterest income excluded from the scope of ASC 606. Amount is presented for informational purposes to reconcile total noninterest income. (c) Includes other service charges, ATM and interchange fees, electronic banking fees, and insurance commissions in scope of ASC 606. Nine Months Ended September 30, 2021 (Dollars in millions) Regional Banking Specialty Banking Corporate Consolidated Noninterest income: Fixed income (a) $ 1 $ 323 $ — $ 324 Deposit transactions and cash management 117 8 5 130 Mortgage banking and title income — 124 2 126 Brokerage, management fees and commissions 65 — — 65 Bankcard income 37 2 1 40 Trust services and investment management 39 — — 39 Securities gains (losses), net (b) — — 12 12 Purchase accounting gain — — (1) (1) Loss on debt extinguishment — — (23) (23) Other income (c) 61 19 37 117 Total noninterest income $ 320 $ 476 $ 33 $ 829 (a) Includes $35 million of underwriting, portfolio advisory, and other noninterest income in scope of Accounting Standards Codification ("ASC") 606, "Revenue From Contracts With Customers." (b) Represents noninterest income excluded from the scope of ASC 606. Amount is presented for informational purposes to reconcile total noninterest income. (c) Includes other service charges, ATM and interchange fees, electronic banking fees, and insurance commissions in scope of ASC 606. Nine Months Ended September 30, 2020 (Dollars in millions) Regional Banking Specialty Banking Corporate Consolidated Noninterest income: Fixed income (a) $ 1 $ 318 $ — $ 319 Deposit transactions and cash management 91 8 4 103 Mortgage banking and title income — 71 1 72 Brokerage, management fees and commissions 47 — — 47 Trust services and investment management 27 — — 27 Bankcard income 23 1 — 24 Securities gains (losses), net (b) — — (2) (2) Purchase accounting gain — — 532 532 Other income (c) 50 12 20 82 Total noninterest income $ 239 $ 410 $ 555 $ 1,204 (a) Includes $29 million of underwriting, portfolio advisory, and other noninterest income in scope of Accounting Standards Codification ("ASC") 606, "Revenue From Contracts With Customers." (b) Represents noninterest income excluded from the scope of ASC 606. Amount is presented for informational purposes to reconcile total noninterest income. (c) Includes other service charges, ATM and interchange fees, electronic banking fees, and insurance commissions in scope of ASC 606.

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2021
Variable Interest Entities [Abstract]
Summary Of VIEs Consolidated By FHN	The following table summarizes the carrying value of assets and liabilities associated with rabbi trusts used for deferred compensation plans which are consolidated by FHN as of September 30, 2021 and December 31, 2020: (Dollars in millions) September 30, 2021 December 31, 2020 Assets: Other assets $ 206 $ 195 Liabilities: Other liabilities $ 175 $ 165
Summary of the Impact of Qualifying LIHTC Investments	The following table summarizes the impact to income tax expense on the Consolidated Statements of Income for the three and nine months ended September 30, 2021 and 2020 for LIHTC investments accounted for under the proportional amortization method. Three Months Ended Nine Months Ended (Dollars in millions) 2021 2020 2021 2020 Income tax expense (benefit): Amortization of qualifying LIHTC investments $ 9 $ 8 $ 26 $ 20 Low income housing tax credits (8) (7) (25) (16) Other tax benefits related to qualifying LIHTC investments (2) (3) (7) (8)
Summary Of VIEs Not Consolidated By FHN	The following table summarizes FHN’s nonconsolidated VIEs as of September 30, 2021: (Dollars in millions) Maximum Liability Classification Type Low income housing partnerships $ 349 $ 116 (a) Other tax credit investments (b) 63 42 Other assets Small issuer trust preferred holdings (c) 202 — Loans and leases On-balance sheet trust preferred securitization 30 84 (d) Holdings of agency mortgage-backed securities (c) 7,380 — (e) Commercial loan troubled debt restructurings (f) 117 — Loans and leases Proprietary trust preferred issuances (g) — 184 Term borrowings (a) Maximum loss exposure represents $233 million of current investments and $116 million of accrued contractual funding commitments. Accrued funding commitments represent unconditional contractual obligations for future funding events and are also recognized in other liabilities. FHN currently expects to be required to fund these accrued commitments by the end of 2024. (b) Maximum loss exposure represents the value of current investments. (c) Maximum loss exposure represents the value of current investments. A liability is not recognized as FHN is solely a holder of the trusts’ securities. (d) Includes $112 million classified as loans and leases and $2 million classified as trading securities which are offset by $84 million classified as term borrowings. (e) Includes $514 million classified as trading securities, $6.6 billion classified as securities available for sale and $304 million classified as held to maturity. (f) Maximum loss exposure represents $113 million of current receivables and $4 million of contractual funding commitments on loans related to commercial borrowers involved in a troubled debt restructuring. (g) No exposure to loss due to nature of FHN's involvement. The following table summarizes FHN’s nonconsolidated VIEs as of December 31, 2020: (Dollars in millions) Maximum Liability Classification Type Low income housing partnerships $ 338 $ 132 (a) Other tax credit investments (b) 64 42 Other assets Small issuer trust preferred holdings (c) 210 — Loans and leases On-balance sheet trust preferred securitization 32 82 (d) Holdings of agency mortgage-backed securities (c) 7,063 — (e) Commercial loan troubled debt restructurings (f) 186 — Loans and leases Proprietary trust preferred issuances (g) — 287 Term borrowings (a) Maximum loss exposure represents $206 million of current investments and $132 million of accrued contractual funding commitments. Accrued funding commitments represent unconditional contractual obligations for future funding events and are also recognized in other liabilities. FHN currently expects to be required to fund these accrued commitments by the end of 2024. (b) Maximum loss exposure represents current investments. (c) Maximum loss exposure represents the value of current investments. A liability is not recognized as FHN is solely a holder of the trusts’ securities. (d) Includes $112 million classified as loans and leases and $2 million classified as trading securities which are offset by $82 million classified as term borrowings. (e) Includes $845 million classified as trading securities and $6.2 billion classified as securities available for sale. (f) Maximum loss exposure represents $176 million of current receivables and $10 million of contractual funding commitments on loans related to commercial borrowers involved in a troubled debt restructuring.

Derivatives (Tables)

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives Associated With Fixed Income Trading Activities	The following tables summarize derivatives associated with FHNF's trading activities as of September 30, 2021 and December 31, 2020: September 30, 2021 (Dollars in millions) Notional Assets Liabilities Customer interest rate contracts $ 3,806 $ 113 $ 36 Offsetting upstream interest rate contracts 3,806 3 17 Option contracts purchased 23 — — Forwards and futures purchased 9,173 6 31 Forwards and futures sold 9,737 37 4 December 31, 2020 (Dollars in millions) Notional Assets Liabilities Customer interest rate contracts $ 3,950 $ 207 $ 7 Offsetting upstream interest rate contracts 3,950 2 17 Forwards and futures purchased 10,795 62 — Forwards and futures sold 11,633 1 65
Derivatives Associated With Interest Rate Risk Management Activities	The following tables summarize FHN’s derivatives associated with interest rate risk management activities as of September 30, 2021 and December 31, 2020: September 30, 2021 (Dollars in millions) Notional Assets Liabilities Customer Interest Rate Contracts Hedging Hedging Instruments and Hedged Items: Customer interest rate contracts $ 7,745 $ 260 $ 16 Offsetting upstream interest rate contracts 7,685 3 26 December 31, 2020 (Dollars in millions) Notional Assets Liabilities Customer Interest Rate Contracts Hedging Hedging Instruments and Hedged Items: Customer interest rate contracts $ 6,868 $ 436 $ 1 Offsetting upstream interest rate contracts 6,868 5 35
Gains/(Losses) on Derivatives Associated with Interest Rate Risk Management Activities	The following table summarizes gains (losses) on FHN’s derivatives associated with interest rate risk management activities for the three and nine months ended September 30, 2021 and 2020: Three Months Ended Nine Months Ended 2021 2020 2021 2020 (Dollars in millions) Gains (Losses) Gains (Losses) Gains (Losses) Gains (Losses) Customer Interest Rate Contracts Hedging Hedging Instruments and Hedged Items: Customer interest rate contracts (a) $ (29) $ (14) $ (197) $ 197 Offsetting upstream interest rate contracts (a) 29 14 $ 197 $ (197) Debt Hedging Hedging Instruments: Interest rate swaps (b) $ — $ (1) $ — $ 3 Hedged Items: Term borrowings (a) (c) — 1 — (2) (a) Gains (losses) included in other expense within the Consolidated Statements of Income. (b) Gains (losses) included in interest expense. (c) Represents gains and losses attributable to changes in fair value due to interest rate risk as designated in ASC 815-20 hedging relationships.
Derivative Associated With Cash Flow Hedges	The following tables summarize FHN’s derivative activities associated with cash flow hedges as of September 30, 2021 and December 31, 2020: September 30, 2021 (Dollars in millions) Notional Assets Liabilities Cash Flow Hedges Hedging Instruments: Interest rate contracts $ 1,100 $ 19 $ — Hedged Items: Variability in cash flows related to debt instruments (primarily loans) N/A $ 1,100 N/A December 31, 2020 (Dollars in millions) Notional Assets Liabilities Cash Flow Hedges Hedging Instruments: Interest rate contracts $ 1,250 $ 32 $ — Hedged Items: Variability in cash flows related to debt instruments (primarily loans) N/A $ 1,250 N/A
Gains/(Losses) on Derivatives Associated with Cash Flow Hedges	The following table summarizes gains (losses) on FHN’s derivatives associated with cash flow hedges for the three and nine months ended September 30, 2021 and 2020: Three Months Ended Nine Months Ended 2021 2020 2021 2020 (Dollars in millions) Gains (Losses) Gains (Losses) Gains (Losses) Gains (Losses) Cash Flow Hedges Hedging Instruments: Interest rate contracts (a) $ (6) $ (8) $ (20) $ 10 Gain (loss) recognized in other comprehensive income (loss) — (1) (1) 14 Gain (loss) reclassified from AOCI into interest income (1) (2) (4) (4) (a) Approximately $20 million of pre-tax gains are expected to be reclassified into earnings in the next twelve months.
Schedule of Fair Value Derivative Instruments, Statements of Financial Performance and Financial Position, Location	The notional and fair values of these contracts are presented in the table below. Balances and activity for periods prior to the IBKC merger were not significant. September 30, 2021 (Dollars in millions) Notional Assets Liabilities Mortgage Banking Hedges Option contracts written $ 419 $ 7 $ — Forward contracts purchased 522 3 — December 31, 2020 (Dollars in millions) Notional Assets Liabilities Mortgage Banking Hedges Option contracts written $ 667 $ 20 $ — Forward contracts purchased 725 — 6 The following table summarizes gains (losses) on FHN's derivatives associated with mortgage banking activities for the three and nine months ended September 30, 2021. Three Months Ended September 30, Three Months Ended September 30, Nine Months Ended September 30, Nine months ended September 30, 2021 2020 2021 2020 (Dollars in millions) Gains (Losses) Gains (Losses) Gains (Losses) Gains (Losses) Mortgage Banking Hedges Option contracts written $ (3) $ 7 $ (12) $ 7 Forward contracts purchased (2) (10) 10 (10)
Derivative Assets And Collateral Received	The following table provides details of derivative assets and collateral received as presented on the Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020: Gross amounts not offset in the Balance Sheets (Dollars in millions) Gross amounts Gross amounts Net amounts of Derivative Collateral Net amount Derivative assets: September 30, 2021 Interest rate derivative contracts $ 408 $ — $ 408 $ (31) $ (217) $ 160 Forward contracts 43 — 43 (20) (4) 19 $ 451 $ — $ 451 $ (51) $ (221) $ 179 December 31, 2020 Interest rate derivative contracts $ 702 $ — $ 702 $ (7) $ (327) $ 368 Forward contracts 63 — 63 (14) (20) 29 $ 765 $ — $ 765 $ (21) $ (347) $ 397 (a) Included in other assets on the Consolidated Balance Sheets. As of September 30, 2021 and December 31, 2020, $4 million of derivative assets have been excluded from these tables because they are generally not subject to master netting or similar agreements.
Derivative Liabilities and Collateral Pledged	The following table provides details of derivative liabilities and collateral pledged as presented on the Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020: Gross amounts not offset (Dollars in millions) Gross amounts Gross amounts Net amounts of Derivative Collateral Net amount Derivative liabilities: September 30, 2021 Interest rate derivative contracts $ 95 $ — $ 95 $ (31) $ (9) $ 55 Forward contracts 35 — 35 (20) (12) 3 $ 130 $ — $ 130 $ (51) $ (21) $ 58 December 31, 2020 Interest rate derivative contracts $ 60 $ — $ 60 $ (7) $ (31) $ 22 Forward contracts 65 — 65 (14) (51) — $ 125 $ — $ 125 $ (21) $ (82) $ 22 (a) Included in other liabilities on the Consolidated Balance Sheets. As of September 30, 2021 and December 31, 2020, $17 million and $22 million, respectively, of derivative liabilities (primarily Visa-related derivatives) have been excluded from these tables because they are generally not subject to master netting or similar agreements.

Master Netting and Similar Ag_2

Master Netting and Similar Agreements—Repurchase, Reverse Repurchase, and Securities Borrowing Transactions (Tables)	9 Months Ended
	Sep. 30, 2021
Offsetting [Abstract]
Securities Purchased Under Agreements To Resell And Collateral Pledged By Counterparties	The following table provides details of securities purchased under agreements to resell and collateral pledged by counterparties as of September 30, 2021 and December 31, 2020: Gross amounts not offset in the (Dollars in millions) Gross amounts Gross amounts Net amounts of Offsetting Securities collateral Net amount Securities purchased under agreements to resell: September 30, 2021 $ 355 $ — $ 355 $ (12) $ (341) $ 2 December 31, 2020 380 — 380 — (379) 1
Securities Sold Under Agreements To Repurchase And Collateral Pledged By Company	The following table provides details of securities sold under agreements to repurchase and collateral pledged by FHN as of September 30, 2021 and December 31, 2020: Gross amounts not offset in the (Dollars in millions) Gross amounts Gross amounts Net amounts of Offsetting Securities/ Net amount Securities sold under agreements to repurchase: September 30, 2021 $ 1,299 $ — $ 1,299 $ (12) $ (1,287) $ — December 31, 2020 1,187 — 1,187 — (1,187) —
Schedule of the Remaining Contractual Maturity by Collateral Type of Securities Sold Under Agreements To Repurchase	The following tables provide details, by collateral type, of the remaining contractual maturity of securities sold under agreements to repurchase as of September 30, 2021 and December 31, 2020: September 30, 2021 (Dollars in millions) Overnight and Up to 30 Days Total Securities sold under agreements to repurchase: U.S. treasuries $ 17 $ — $ 17 Government agency issued MBS 1,097 — 1,097 Government agency issued CMO 1 — 1 Other U.S. government agencies 51 — 51 Government guaranteed loans (SBA and USDA) 133 — 133 Total securities sold under agreements to repurchase $ 1,299 $ — $ 1,299 December 31, 2020 (Dollars in millions) Overnight and Up to 30 Days Total Securities sold under agreements to repurchase: U.S. treasuries $ 284 $ — $ 284 Government agency issued MBS 616 — 616 Government agency issued CMO 10 — 10 Other U.S. government agencies 151 — 151 Government guaranteed loans (SBA and USDA) 126 — 126 Total securities sold under agreements to repurchase $ 1,187 $ — $ 1,187

Fair Value of Assets and Liab_2

Fair Value of Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis	The following tables present the balances of assets and liabilities measured at fair value on a recurring basis as of September 30, 2021 and December 31, 2020: September 30, 2021 (Dollars in millions) Level 1 Level 2 Level 3 Total Trading securities: U.S. treasuries $ — $ 66 $ — $ 66 Government agency issued MBS — 276 — 276 Government agency issued CMO — 238 — 238 Other U.S. government agencies — 196 — 196 States and municipalities — 39 — 39 Corporate and other debt — 504 — 504 Total trading securities — 1,319 — 1,319 Loans held for sale (elected fair value) — 277 24 301 Securities available for sale: U.S. treasuries — 603 — 603 Government agency issued MBS — 4,345 — 4,345 Government agency issued CMO — 2,217 — 2,217 Other U.S. government agencies — 788 — 788 States and municipalities — 525 — 525 Interest-only strips (elected fair value) — — 16 16 Total securities available for sale — 8,478 16 8,494 Other assets: Deferred compensation mutual funds 127 — — 127 Equity, mutual funds, and other 28 — — 28 Derivatives, forwards and futures 46 — — 46 Derivatives, interest rate contracts — 405 — 405 Derivatives, other — 2 — 2 Total other assets 201 407 — 608 Total assets $ 201 $ 10,481 $ 40 $ 10,722 Trading liabilities: U.S. treasuries $ — $ 222 $ — $ 222 States and municipalities — 1 — 1 Corporate and other debt — 92 — 92 Total trading liabilities — 315 — 315 Other liabilities: Derivatives, forwards and futures 35 — — 35 Derivatives, interest rate contracts — 95 — 95 Derivatives, other — 1 16 17 Total other liabilities 35 96 16 147 Total liabilities $ 35 $ 411 $ 16 $ 462 December 31, 2020 (Dollars in millions) Level 1 Level 2 Level 3 Total Trading securities: U.S. treasuries $ — $ 81 $ — $ 81 Government agency issued MBS — 633 — 633 Government agency issued CMO — 212 — 212 Other U.S. government agencies — 62 — 62 States and municipalities — 7 — 7 Corporate and other debt — 181 — 181 Total trading securities — 1,176 — 1,176 Loans held for sale (elected fair value) — 393 12 405 Loans held for investment (elected fair value) — — 16 16 Securities available for sale: U.S. treasuries — 613 — 613 Government agency issued MBS — 3,812 — 3,812 Government agency issued CMO — 2,406 — 2,406 Other U.S. government agencies — 684 — 684 States and municipalities — 460 — 460 Corporate and other debt — 40 — 40 Interest-only strips (elected fair value) — — 32 32 Total securities available for sale — 8,015 32 8,047 Other assets: Deferred compensation mutual funds 118 — — 118 Equity, mutual funds, and other 25 — — 25 Derivatives, forwards and futures 63 — — 63 Derivatives, interest rate contracts — 702 — 702 Derivatives, other — 4 — 4 Total other assets 206 706 — 912 Total assets $ 206 $ 10,290 $ 60 $ 10,556 Trading liabilities: U.S. treasuries $ — $ 307 $ — $ 307 Government agency issued MBS — 3 — 3 Corporates and other debt — 43 — 43 Total trading liabilities — 353 — 353 Other liabilities: Derivatives, forwards and futures 71 — — 71 Derivatives, interest rate contracts — 60 — 60 Derivatives, other — 4 14 18 Total other liabilities 71 64 14 149 Total liabilities $ 71 $ 417 $ 14 $ 502
Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value	The changes in Level 3 assets and liabilities measured at fair value for the three months ended September 30, 2021 and 2020 on a recurring basis are summarized as follows: Three Months Ended September 30, 2021 (Dollars in millions) Interest- only strips- AFS Loans held Net Balance on July 1, 2021 $ 30 $ 25 $ (18) Total net gains (losses) included in net income 1 — — Purchases — 3 — Sales (35) (8) — Settlements — — 2 Net transfers into (out of) Level 3 20 (b) 4 — Balance on September 30, 2021 $ 16 $ 24 $ (16) Net unrealized gains (losses) included in net income $ — (c) $ — (a) $ — (d) Three Months Ended September 30, 2020 (Dollars in millions) Trading Interest-only-strips-AFS Loans held for sale Loans Net Balance on July 1, 2020 $ 1 $ 25 $ 13 $ — $ (19) Acquired — — — 13 — Total net gains (losses) included in net income — (1) — — — Purchases — — — — — Sales — — — (3) — Settlements — — (1) (2) 2 Net transfers into (out of) Level 3 — 9 (b) — 4 — Balance on September 30, 2020 $ 1 $ 33 $ 12 $ 12 $ (17) Net unrealized gains (losses) included in net income $ — (a) $ 1 (c) $ — (a) $ — $ — (d) (a) Primarily included in mortgage banking and title income on the Consolidated Statements of Income. (b) Transfers into interest-only strips - AFS level 3 measured on a recurring basis reflect movements from loans held for sale (Level 2 nonrecurring). (c) Primarily included in fixed income on the Consolidated Statements of Income. (d) Included in other expense. The changes in Level 3 assets and liabilities measured at fair value for the nine months ended September 30, 2021 and 2020, on a recurring basis are summarized as follows: Nine Months Ended September 30, 2021 (Dollars in millions) Interest- only strips- AFS Loans held Loans held for investment Net Balance on January 1, 2021 $ 32 $ 12 $ 16 $ (14) Total net gains (losses) included in net income 5 2 — (9) Purchases — 8 — — Sales (68) (18) — — Settlements — (2) (2) 7 Net transfers into (out of) Level 3 47 (b) 22 (e) (14) (e) — Balance on September 30, 2021 $ 16 $ 24 $ — $ (16) Net unrealized gains (losses) included in net income $ — (c) $ 2 (a) $ — $ (9) (d) Nine Months Ended September 30, 2020 (Dollars in millions) Trading Interest-only-strips-AFS Loans held for sale Loans held for investment Net Balance on January 1, 2020 $ 1 $ 19 $ 14 $ — $ (23) Acquired — — — 13 — Total net gains (losses) included in net income — (4) 1 — (1) Purchases — 5 — — — Sales — (8) — (3) — Settlements — — (3) (2) 7 Net transfers into (out of) Level 3 — 21 (b) — 4 — Balance on September 30, 2020 $ 1 $ 33 $ 12 $ 12 $ (17) Net unrealized gains (losses) included in net income $ — (a) $ 3 (c) $ 1 (a) $ — $ (1) (d) (a) Primarily included in mortgage banking and title income on the Consolidated Statements of Income. (b) Transfers into interest-only strips - AFS level 3 measured on a recurring basis reflect movements from loans held for sale (Level 2 nonrecurring). (c) Primarily included in fixed income on the Consolidated Statements of Income. (d) Included in other expense. (e) The loans held for investment at fair value option portfolio was transferred to the loans held for sale portfolio on July 1, 2021.
Nonrecurring Fair Value Measurements	For assets measured at fair value on a nonrecurring basis which were still held on the Consolidated Balance Sheets at September 30, 2021, and December 31, 2020, respectively, the following tables provide the level of valuation assumptions used to determine each adjustment and the related carrying value. Carrying value at September 30, 2021 (Dollars in millions) Level 1 Level 2 Level 3 Total Loans held for sale—SBAs and USDA $ — $ 693 $ 1 $ 694 Loans held for sale—first mortgages — — 1 1 Loans and leases (a) — — 86 86 OREO (b) — — 6 6 Other assets (c) — — 10 10 Carrying value at December 31, 2020 (Dollars in millions) Level 1 Level 2 Level 3 Total Loans held for sale—SBAs and USDA $ — $ 508 $ 1 $ 509 Loans held for sale—first mortgages — — 1 1 Loans and leases (a) — — 77 77 OREO (b) — — 15 15 Other assets (c) — — 9 9 (a) Represents carrying value of loans for which adjustments are required to be based on the appraised value of the collateral less estimated costs to sell. Write-downs on these loans are recognized as part of provision for credit losses. (b) Represents the fair value and related losses of foreclosed properties that were measured subsequent to their initial classification as OREO. Balance excludes OREO related to government insured mortgages. (c) Represents tax credit investments accounted for under the equity method.
Gains/(losses) on Nonrecurring Fair Value Measurements	For assets measured on a nonrecurring basis which were still held on the Consolidated Balance Sheets at period end, the following table provides information about the fair value adjustments recorded during the three and nine months ended September 30, 2021 and 2020: Net gains (losses) Net gains (losses) (Dollars in millions) 2021 2020 2021 2020 Loans held for sale—SBAs and USDA $ (2) $ (2) $ (3) $ (3) Loans and leases (a) (9) (17) (12) (31) OREO (b) — — (1) — Other assets (c) (2) — (2) (1) $ (13) $ (19) $ (18) $ (35) (a) Write-downs on these loans are recognized as part of provision for credit losses. (b) Represents the fair value and related losses of foreclosed properties that were measured subsequent to their initial classification as OREO. Balance excludes OREO related to government insured mortgages. (c) Represents tax credit investments accounted for under the equity method.
Schedule Of Unobservable Inputs Utilized In Determining The Fair Value Of Level 3 Recurring And Non-Recurring Measurements	The following tables provide information regarding the unobservable inputs utilized in determining the fair value of Level 3 recurring and non-recurring measurements as of September 30, 2021 and December 31, 2020: (Dollars in millions) Values Utilized Level 3 Class Fair Value at September 30, 2021 Valuation Techniques Unobservable Input Range Weighted Average (d) Available for sale securities - SBA interest-only strips $ 16 Discounted cash flow Constant prepayment rate 11% - 12% 11% Bond equivalent yield 10% 10% Loans held for sale - residential real estate $ 25 Discounted cash flow Prepayment speeds - First mortgage 4% - 12% 5% Foreclosure losses 63% - 65% 64% Loss severity trends - First mortgage 1% - 14% of UPB 8% Loans held for sale - unguaranteed interest in SBA loans $ 1 Discounted cash flow Constant prepayment rate 8% - 12% 10% Bond equivalent yield 8% 8% Derivative liabilities, other $ 16 Discounted cash flow Visa covered litigation resolution amount $5.4 billion - $6.0 billion $5.8 billion Probability of resolution scenarios 10% - 50% 16% Time until resolution 6 - 30 months 21 months Loans and leases (a) $ 86 Appraisals from comparable properties Marketability adjustments for specific properties 0% - 10% of appraisal NM Other collateral valuations Borrowing base certificates adjustment 20% - 50% of gross value NM Financial Statements/Auction values adjustment 0% - 25% of reported value NM OREO (b) $ 6 Appraisals from comparable properties Adjustment for value changes since appraisal 0% - 10% of appraisal NM Other assets (c) $ 10 Discounted cash flow Adjustments to current sales yields for specific properties 0% - 15% adjustment to yield NM Appraisals from comparable properties Marketability adjustments for specific properties 0% - 25% of appraisal NM NM - Not meaningful (a) Represents carrying value of loans for which adjustments are required to be based on the appraised value of the collateral less estimated costs to sell. Write-downs on these loans are recognized as part of provision for credit losses. (b) Represents the fair value of foreclosed properties that were measured subsequent to their initial classification as OREO. Balance excludes OREO related to government insured mortgages. (c) Represents tax credit investments accounted for under the equity method. (d) Weighted averages are determined by the relative fair value of the instruments or the relative contribution to an instrument's fair value. (Dollars in millions) Values Utilized Level 3 Class Fair Value at December 31, 2020 Valuation Techniques Unobservable Input Range Weighted Average (d) Available for sale securities - SBA interest-only strips $ 32 Discounted cash flow Constant prepayment rate 12% 12% Bond equivalent yield 15% - 17% 15% Loans held for sale - residential real estate $ 13 Discounted cash flow Prepayment speeds - First mortgage 5% - 15% 5% Foreclosure losses 59% - 70% 63% Loss severity trends - First mortgage 3% - 19% of UPB 12% Loans held for sale - unguaranteed interest in SBA loans $ 1 Discounted cash flow Constant prepayment rate 8% - 12% 10% Bond equivalent yield 7% - 8% 7% Loans held for investment $ 16 Discounted cash flow Constant prepayment rate 0% - 26% 11% Constant default rate 0% - 14% 1% Loss severity trends 0% - 100% 11% Derivative liabilities, other $ 14 Discounted cash flow Visa covered litigation resolution amount $5.4 billion - $6.0 billion $5.8 billion Probability of resolution scenarios 10% - 50% 16% Time until resolution 3 - 27 months 19 months Loans and leases (a) $ 77 Appraisals from comparable properties Marketability adjustments for specific properties 0% - 10% of appraisal NM Other collateral valuations Borrowing base certificates adjustment 20% - 50% of gross value NM Financial Statements/Auction values adjustment 0% - 25% of reported value NM OREO (b) $ 15 Appraisals from comparable properties Adjustment for value changes since appraisal 0% - 10% of appraisal NM Other assets (c) $ 9 Discounted cash flow Adjustments to current sales yields for specific properties 0% - 15% adjustment to yield NM Appraisals from comparable properties Marketability adjustments for specific properties 0% - 25% of appraisal NM NM - Not meaningful (a) Represents carrying value of loans for which adjustments are required to be based on the appraised value of the collateral less estimated costs to sell. Write-downs on these loans are recognized as part of provision for credit losses. (b) Represents the fair value of foreclosed properties that were measured subsequent to their initial classification as OREO. Balance excludes OREO related to government insured mortgages. (c) Represents tax credit investments accounted for under the equity method. (d) Weighted averages are determined by the relative fair value of the instruments or the relative contribution to an instrument's fair value.
Summary Of Differences Between The Fair Value Carrying Amount Of Mortgages Held-For-Sale And Aggregate Unpaid Principal Amount	The following tables reflect the differences between the fair value carrying amount of residential real estate loans held for sale and held for investment measured at fair value in accordance with management’s election and the aggregate unpaid principal amount FHN is contractually entitled to receive at maturity. September 30, 2021 (Dollars in millions) Fair value Aggregate Fair value carrying amount Residential real estate loans held for sale reported at fair value: Total loans $ 301 $ 305 $ (4) Nonaccrual loans 4 7 (3) Loans 90 days or more past due and still accruing 1 1 — December 31, 2020 (Dollars in millions) Fair value Aggregate Fair value carrying amount Residential real estate loans held for sale reported at fair value: Total loans $ 405 $ 442 $ (37) Nonaccrual loans 2 5 (3) Loans held for investment reported at fair value: Total loans 16 17 (1) Nonaccrual loans 1 1 —
Changes In Fair Value Of Assets And Liabilities Which Fair Value Option Included In Current Period Earnings	Assets and liabilities accounted for under the fair value election are initially measured at fair value with subsequent changes in fair value recognized in earnings. Such changes in the fair value of assets and liabilities for which FHN elected the fair value option are included in current period earnings with classification in the income statement line item reflected in the following table: Three Months Ended Nine Months Ended (Dollars in millions) 2021 2020 2021 2020 Changes in fair value included in net income: Mortgage banking and title income Loans held for sale $ (3) $ 2 $ (8) $ 3
Summary Of Book Value And Estimated Fair Value Of Financial Instruments	The following tables summarize the book value and estimated fair value of financial instruments recorded in the Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020: September 30, 2021 Book Fair Value (Dollars in millions) Level 1 Level 2 Level 3 Total Assets: Loans and leases, net of allowance for loan and lease losses Commercial: Commercial, financial and industrial $ 31,142 $ — $ — $ 30,972 $ 30,972 Commercial real estate 12,032 — — 12,027 12,027 Consumer: Consumer real estate 10,608 — — 11,151 11,151 Credit card and other 919 — — 945 945 Total loans and leases, net of allowance for loan and lease losses 54,701 — — 55,095 55,095 Short-term financial assets: Interest-bearing deposits with banks 14,829 14,829 — — 14,829 Federal funds sold 6 — 6 — 6 Securities purchased under agreements to resell 355 — 355 — 355 Total short-term financial assets 15,190 14,829 361 — 15,190 Trading securities (a) 1,319 — 1,319 — 1,319 Loans held for sale: Mortgage loans (elected fair value) (a) 301 — 277 24 301 USDA & SBA loans - LOCOM 693 — 696 1 697 Other loans - LOCOM 4 — 4 — 4 Mortgage loans - LOCOM 52 — — 52 52 Total loans held for sale 1,050 — 977 77 1,054 Securities available for sale (a) 8,494 — 8,478 16 8,494 Securities held to maturity 304 — 303 — 303 Derivative assets (a) 453 46 407 — 453 Other assets: Tax credit investments 409 — — 395 395 Deferred compensation mutual funds 127 127 — — 127 Equity, mutual funds, and other (b) 260 28 — 232 260 Total other assets 796 155 — 627 782 Total assets $ 82,307 $ 15,030 $ 11,845 $ 55,815 $ 82,690 Liabilities: Defined maturity deposits $ 3,920 $ — $ 3,926 $ — $ 3,926 Trading liabilities (a) 315 — 315 — 315 Short-term financial liabilities: Federal funds purchased 814 — 814 — 814 Securities sold under agreements to repurchase 1,299 — 1,299 — 1,299 Other short-term borrowings 111 — 111 — 111 Total short-term financial liabilities 2,224 — 2,224 — 2,224 Term borrowings: Real estate investment trust-preferred 47 — — 47 47 Term borrowings—new market tax credit investment 45 — — 44 44 Secured borrowings 4 — — 4 4 Junior subordinated debentures 160 — — 184 184 Other long term borrowings 1,328 — 1,464 — 1,464 Total term borrowings 1,584 — 1,464 279 1,743 Derivative liabilities (a) 147 35 96 16 147 Total liabilities $ 8,190 $ 35 $ 8,025 $ 295 $ 8,355 (a) Classes are detailed in the recurring and nonrecurring measurement tables. (b) Level 1 primarily consists of mutual funds with readily determinable fair values. Level 3 includes restricted investments in FHLB-Cincinnati stock of $29 million and FRB stock of $203 million. December 31, 2020 Book Fair Value (Dollars in millions) Level 1 Level 2 Level 3 Total Assets: Loans and leases and allowance for loan and lease losses Commercial: Commercial, financial and industrial $ 32,651 $ — $ — $ 32,582 $ 32,582 Commercial real estate 12,033 — — 12,079 12,079 Consumer: Consumer real estate 11,483 — — 11,903 11,903 Credit card and other 1,102 — — 1,131 1,131 Total loans and leases, net of allowance for loan and lease losses 57,269 — — 57,695 57,695 Short-term financial assets: Interest-bearing deposits with banks 8,351 8,351 — — 8,351 Federal funds sold 65 — 65 — 65 Securities purchased under agreements to resell 380 — 380 — 380 Total short-term financial assets 8,796 8,351 445 — 8,796 Trading securities (a) 1,176 — 1,176 — 1,176 Loans held for sale: Mortgage loans (elected fair value) (a) 405 — 393 12 405 USDA & SBA loans - LOCOM 509 — 511 1 512 Other loans - LOCOM 31 — 31 — 31 Mortgage loans - LOCOM 77 — — 77 77 Total loans held for sale 1,022 — 935 90 1,025 Securities available for sale (a) 8,047 — 8,015 32 8,047 Securities held to maturity 10 — — 10 10 Derivative assets (a) 769 63 706 — 769 Other assets: Tax credit investments 400 — — 371 371 Deferred compensation mutual funds 118 118 — — 118 Equity, mutual funds, and other (b) 288 25 — 263 288 Total other assets 806 143 — 634 777 Total assets $ 77,895 $ 8,557 $ 11,277 $ 58,461 $ 78,295 Liabilities: Defined maturity deposits $ 5,070 $ — $ 5,083 $ — $ 5,083 Trading liabilities (a) 353 — 353 — 353 Short-term financial liabilities: Federal funds purchased 845 — 845 — 845 Securities sold under agreements to repurchase 1,187 — 1,187 — 1,187 Other short-term borrowings 166 — 166 — 166 Total short-term financial liabilities 2,198 — 2,198 — 2,198 Term borrowings: Real estate investment trust-preferred 46 — — 47 47 Term borrowings—new market tax credit investment 45 — — 45 45 Secured borrowings 15 — — 15 15 Junior subordinated debentures 238 — — 223 223 Other long term borrowings 1,326 — 1,455 — 1,455 Total term borrowings 1,670 — 1,455 330 1,785 Derivative liabilities (a) 149 71 64 14 149 Total liabilities $ 9,440 $ 71 $ 9,153 $ 344 $ 9,568 (a) Classes are detailed in the recurring and nonrecurring measurement tables. (b) Level 1 primarily consists of mutual funds with readily determinable fair values. Level 3 includes restricted investments in FHLB-Cincinnati stock of $61 million and FRB stock of $202 million. The following table presents the contractual amount and fair value of unfunded loan commitments and standby and other commitments as of September 30, 2021 and December 31, 2020: Contractual Amount Fair Value (Dollars in millions) September 30, 2021 December 31, 2020 September 30, 2021 December 31, 2020 Unfunded Commitments: Loan commitments $ 23,279 $ 20,796 $ 1 $ 2 Standby and other commitments 749 751 8 6

Acquisitions and Divestitures -

Acquisitions and Divestitures - Narrative (Details) $ in Millions	Jul. 01, 2020USD ($)officestatenewPreferredStockSeriesshares	Sep. 30, 2021USD ($)shares	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)shares	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)shares	Jul. 17, 2020USD ($)branch	Dec. 31, 2019USD ($)
Business Acquisition [Line Items]
Number of common stock issued (in shares) | shares	243,000,000	541,859,599		541,859,599		555,030,652
Number of new series of preferred stock | newPreferredStockSeries	3
Purchase accounting gain		$ 0	$ 532	$ (1)	$ 532
Goodwill		$ 1,511		$ 1,511		$ 1,511		$ 1,433
IBERIABANK (IBKC)
Business Acquisition [Line Items]
Equity interest issued, value assigned	$ 2,500
Purchase accounting gain	$ 531					531
Truist Bank Branches
Business Acquisition [Line Items]
Number of bank branches | branch							30
Goodwill						$ 78	$ 78
IBERIABANK (IBKC)
Business Acquisition [Line Items]
Number of offices | office	319
Number of states | state	12

Acquisitions and Divestitures_2

Acquisitions and Divestitures - Purchase Price Allocation (Details) - USD ($) $ in Millions	Jul. 01, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Consideration paid:
Purchase accounting gain		$ 0	$ (532)	$ 1	$ (532)
IBERIABANK (IBKC)
Assets:
Cash and due from banks	$ 395
Interest-bearing deposits with banks	1,683
Securities available for sale at fair value	3,544
Loans held for sale	320
Loans and leases	25,921
Allowance for loan and lease losses	(284)
Other intangible assets	240
Premises and equipment	311
OREO	9
Other assets	1,153
Total assets acquired	33,292
Liabilities:
Deposits	28,232
Short-term borrowings	209
Term borrowings	1,200
Other liabilities	618
Total liabilities assumed	30,259
Net assets acquired	3,033
Consideration paid:
Total consideration paid	2,502
Purchase accounting gain	(531)					$ (531)
IBERIABANK (IBKC) | Equity awards
Consideration paid:
Consideration for outstanding common stock	28
IBERIABANK (IBKC) | Commercial | Sales-Type And Direct Financing Leases
Assets:
Loans and leases	1,300
IBERIABANK (IBKC) | Common Stock
Consideration paid:
Consideration for outstanding common stock	2,243
IBERIABANK (IBKC) | Preferred Stock
Consideration paid:
Consideration for outstanding common stock	$ 231

Acquisitions and Divestitures_3

Acquisitions and Divestitures - Merger and Integration Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Merger and integration expense	$ 46	$ 101	$ 147	$ 121
Personal expense
Business Acquisition [Line Items]
Merger and integration expense	10	35	47	41
Legal and professional fees
Business Acquisition [Line Items]
Merger and integration expense	9	31	15	38
Contribution expense
Business Acquisition [Line Items]
Merger and integration expense	0	20	0	20
Other expense
Business Acquisition [Line Items]
Merger and integration expense	$ 27	$ 15	$ 85	$ 22

Investment Securities - Schedul

Investment Securities - Schedule of Amortized Cost, Unrealized Gains/(Losses) and Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 8,471
Securities available for sale at fair value	8,494	$ 8,047
Securities pledged as collateral	7,500	6,400
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	304	10
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	0
Fair Value	303	10
U.S. treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	603	613
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Securities available for sale at fair value	603	613
Government agency issued MBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,324	3,722
Gross Unrealized Gains	58	92
Gross Unrealized Losses	(37)	(2)
Securities available for sale at fair value	4,345	3,812
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	229
Gross Unrealized Gains	0
Gross Unrealized Losses	(1)
Fair Value	228
Government agency issued CMO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,234	2,380
Gross Unrealized Gains	14	29
Gross Unrealized Losses	(31)	(3)
Securities available for sale at fair value	2,217	2,406
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	75
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	75
Other U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	794	672
Gross Unrealized Gains	6	12
Gross Unrealized Losses	(12)	0
Securities available for sale at fair value	788	684
Corporate and other debt
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		40
Gross Unrealized Gains		1
Gross Unrealized Losses		(1)
Securities available for sale at fair value		40
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		10
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		10
States and municipalities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	516	445
Gross Unrealized Gains	10	15
Gross Unrealized Losses	(1)	0
Securities available for sale at fair value	525	460
Securities available-for-sale, excluding interest only strip:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,471	7,872
Gross Unrealized Gains	88	149
Gross Unrealized Losses	(81)	(6)
Securities available for sale at fair value	8,478	8,015
Interest- only strips- AFS
Debt Securities, Available-for-sale [Line Items]
Securities available for sale at fair value	$ 16	$ 32

Investment Securities - Sched_2

Investment Securities - Schedule Of Amortized Cost And Fair Value By Contractual Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Held-to-Maturity, Amortized Cost
Within 1 year	$ 0
After 1 year through 5 years	0
After 5 years through 10 years
After 10 years	0
Subtotal	0
Government agency issued MBS and CMO	304
Total	304
Held-to-Maturity, Fair Value
Within 1 year	0
After 1 year through 5 years	0
After 5 years through 10 years	0
After 10 years	0
Subtotal	0
Government agency issued MBS and CMO	303
Fair Value	303	$ 10
Available-for-Sale, Amortized Cost
Within 1 year	654
After 1 year through 5 years	152
After 5 years through 10 years	347
After 10 years	760
Subtotal	1,913
Government agency issued MBS and CMO	6,558
Securities available for sale, amortized cost	8,471
Available-for-Sale, Fair Value
Within 1 year	654
After 1 year through 5 years	153
After 5 years through 10 years	355
After 10 years	770
Subtotal	1,932
Government agency issued MBS and CMO	6,562
Securities available-for-sale	$ 8,494	$ 8,047

Investment Securities - Narrati

Investment Securities - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Marketable Securities [Abstract]
Gains (losses) on available-for-sale securities	$ 0	$ 0	$ 0	$ 0
Available-for-sale, accrued interest, after allowance for credit loss	23,000,000		23,000,000		$ 22,000,000
Allowance for credit loss	0		0		0
Carrying amount of equity investments without a readily determinable fair value	73,000,000		73,000,000		$ 57,000,000
Unrealized gain (loss) for equity investments with readily determinable fair values	$ 1,000,000	$ 1,000,000	$ 7,000,000	$ (4,000,000)

Investment Securities - Sched_3

Investment Securities - Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Less than 12 months	$ 3,946	$ 1,400
12 months or longer	278	0
Total fair value	4,224	1,400
Unrealized Losses
Less than 12 months	(71)	(6)
12 months or longer	(10)	0
Total unrealized losses	(81)	(6)
U.S. treasuries
Schedule of Investments [Line Items]
Less than 12 months		307
12 months or longer		0
Total fair value		307
Unrealized Losses
Less than 12 months		0
12 months or longer		0
Total unrealized losses		0
Government agency issued MBS
Schedule of Investments [Line Items]
Less than 12 months	2,101	426
12 months or longer	99	0
Total fair value	2,200	426
Unrealized Losses
Less than 12 months	(33)	(2)
12 months or longer	(4)	0
Total unrealized losses	(37)	(2)
Government agency issued CMO
Schedule of Investments [Line Items]
Less than 12 months	1,243	586
12 months or longer	179	0
Total fair value	1,422	586
Unrealized Losses
Less than 12 months	(25)	(3)
12 months or longer	(6)	0
Total unrealized losses	(31)	(3)
Other U.S. government agencies
Schedule of Investments [Line Items]
Less than 12 months	495	80
12 months or longer	0	0
Total fair value	495	80
Unrealized Losses
Less than 12 months	(12)	(1)
12 months or longer	0	0
Total unrealized losses	(12)	(1)
States and municipalities
Schedule of Investments [Line Items]
Less than 12 months	107	1
12 months or longer	0	0
Total fair value	107	1
Unrealized Losses
Less than 12 months	(1)	0
12 months or longer	0	0
Total unrealized losses	$ (1)	$ 0

Loans and Leases - Narrative (D

Loans and Leases - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest	$ 143,000,000	$ 143,000,000	$ 180,000,000
Net loans and leases	54,701,000,000	54,701,000,000	57,269,000,000
Loans and leases	55,435,000,000	55,435,000,000	58,232,000,000
Troubled debt restructurings loans	239,000,000	239,000,000	307,000,000
C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral for secured borrowings	174,000,000	174,000,000	167,000,000
Allowance for credit loss, writeoff, collateral	9,000,000	25,000,000
Loans Held For Sale, Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings loans	37,000,000	37,000,000	42,000,000
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	31,516,000,000	31,516,000,000	33,104,000,000
Commercial | Commercial and industrial | Finance And Insurance Companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	3,200,000,000	3,200,000,000
Commercial | Commercial and industrial | Loans to mortgage companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 5,139,000,000	$ 5,139,000,000	5,404,000,000
Percentage contributed	26.00%	26.00%
Commercial | Commercial and industrial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 26,377,000,000	$ 26,377,000,000	27,700,000,000
Collateral for secured borrowings	161,000,000	161,000,000
Commercial | Loans to mortgage companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	5,139,000,000	5,139,000,000	5,404,000,000
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	12,194,000,000	12,194,000,000	12,275,000,000
Commercial | Commercial real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	12,194,000,000	12,194,000,000	12,275,000,000
Collateral for secured borrowings	13,000,000	13,000,000
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	10,787,000,000	10,787,000,000	11,725,000,000
Consumer | Consumer Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	10,787,000,000	10,787,000,000	11,725,000,000
Allowance for credit loss, writeoff, collateral	0	0
Consumer | Consumer Real Estate | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	2,041,000,000	2,041,000,000	2,420,000,000
Collateral for secured borrowings	8,000,000	8,000,000	9,000,000
Consumer | Consumer Real Estate | Real estate installment loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	8,746,000,000	8,746,000,000	9,305,000,000
Collateral for secured borrowings	21,000,000	21,000,000	26,000,000
Asset Pledged as Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net loans and leases	$ 37,400,000,000	$ 37,400,000,000	$ 38,600,000,000

Loans and Leases - Schedule Of

Loans and Leases - Schedule Of Loans By Portfolio Segment (Details) - USD ($) $ in Millions	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 55,435		$ 58,232
Allowance for loan and lease losses	(734)	$ (815)	(963)	$ (988)	$ (538)	$ (307)
Net loans and leases	54,701		57,269
Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Property, plant, and equipment and finance lease right-of-use asset	719		587
Commercial | Commercial and Industrial, Excluding Loans to Mortgage Companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	26,377		27,700
Commercial | Loans to mortgage companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	5,139		5,404
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	31,516		33,104
Allowance for loan and lease losses	(374)	(385)	(453)	(489)	(319)	(142)
Commercial | Commercial and industrial | Paycheck Protection Plan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	2,000		4,100
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	12,194		12,275
Allowance for loan and lease losses	(162)	(210)	(242)	(208)	(57)	(29)
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	10,787		11,725
Consumer | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	2,041		2,420
Consumer | Real estate installment loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	8,746		9,305
Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	938		1,128
Allowance for loan and lease losses	$ (19)	$ (17)	$ (26)	$ (26)	$ (18)	$ (15)

Loans and Leases - Balances Of

Loans and Leases - Balances Of Commercial Loan Portfolio Classes, Disaggregated By PD Grade (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 55,435	$ 58,232
Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	5,883	9,331
Financing receivable, originated year two	4,356	5,308
Financing receivable, originated year three	3,957	2,812
Financing receivable, originated year four	1,847	1,829
Financing receivable, originated year five	1,362	1,240
Financing receivable, originated prior to year five	2,652	2,267
LMC, Non-Revolving Loans	5,139	5,404
Revolving loans	6,255	4,793
Revolving Loans converted to term loans	65	120
Loans and leases	31,516	33,104
Revolving loans converted to term loan during period	0	50
Commercial and industrial | PD Grade 1 -12 | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	5,822	9,060
Financing receivable, originated year two	4,208	5,138
Financing receivable, originated year three	3,809	2,628
Financing receivable, originated year four	1,682	1,748
Financing receivable, originated year five	1,294	1,161
Financing receivable, originated prior to year five	2,551	2,145
LMC, Non-Revolving Loans	5,139	5,404
Revolving loans	5,972	4,571
Revolving Loans converted to term loans	13	60
Loans and leases	30,490	31,915
Commercial and industrial | PD Grade 13 | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	20	89
Financing receivable, originated year two	37	93
Financing receivable, originated year three	74	70
Financing receivable, originated year four	59	31
Financing receivable, originated year five	38	37
Financing receivable, originated prior to year five	48	64
LMC, Non-Revolving Loans	0	0
Revolving loans	154	127
Revolving Loans converted to term loans	4	1
Loans and leases	434	512
Commercial and industrial | PD Grade 14 15 16 | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	41	182
Financing receivable, originated year two	111	77
Financing receivable, originated year three	74	114
Financing receivable, originated year four	106	50
Financing receivable, originated year five	30	42
Financing receivable, originated prior to year five	53	58
LMC, Non-Revolving Loans	0	0
Revolving loans	129	95
Revolving Loans converted to term loans	48	59
Loans and leases	592	677
Commercial real estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	12,194	12,275
Commercial real estate | CRE | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2,230	2,555
Financing receivable, originated year two	2,307	3,348
Financing receivable, originated year three	2,876	1,888
Financing receivable, originated year four	1,395	1,257
Financing receivable, originated year five	913	1,044
Financing receivable, originated prior to year five	2,189	1,887
Revolving loans	284	277
Revolving Loans converted to term loans	0	19
Loans and leases	12,194	12,275
Commercial real estate | PD Grade 1 -12 | CRE | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	2,216	2,477
Financing receivable, originated year two	2,264	3,311
Financing receivable, originated year three	2,814	1,750
Financing receivable, originated year four	1,208	1,140
Financing receivable, originated year five	806	946
Financing receivable, originated prior to year five	2,054	1,800
Revolving loans	259	259
Revolving Loans converted to term loans	0	19
Loans and leases	11,621	11,702
Commercial real estate | PD Grade 13 | CRE | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	4	48
Financing receivable, originated year two	26	24
Financing receivable, originated year three	50	117
Financing receivable, originated year four	171	75
Financing receivable, originated year five	69	71
Financing receivable, originated prior to year five	91	54
Revolving loans	0	0
Revolving Loans converted to term loans	0	0
Loans and leases	411	389
Commercial real estate | PD Grade 14 15 16 | CRE | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	10	30
Financing receivable, originated year two	17	13
Financing receivable, originated year three	12	21
Financing receivable, originated year four	16	42
Financing receivable, originated year five	38	27
Financing receivable, originated prior to year five	44	33
Revolving loans	25	18
Revolving Loans converted to term loans	0	0
Loans and leases	$ 162	$ 184

Loans and Leases - Loans by FIC

Loans and Leases - Loans by FICO Score (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 55,435	$ 58,232
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	10,787	11,725
Consumer | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1,610	1,747
Financing receivable, originated year two	1,559	1,670
Financing receivable, originated year three	1,215	1,093
Financing receivable, originated year four	794	920
Financing receivable, originated year five	1,312	1,054
Financing receivable, originated prior to year five	2,256	2,821
Revolving loans	1,748	2,055
Revolving Loans converted to term loans	293	365
Loans and leases	10,787	11,725
Consumer | Consumer real estate | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	1,037	1,186
Financing receivable, originated year two	1,085	1,167
Financing receivable, originated year three	844	703
Financing receivable, originated year four	500	610
Financing receivable, originated year five	682	674
Financing receivable, originated prior to year five	1,692	1,719
Revolving loans	1,104	1,275
Revolving Loans converted to term loans	130	159
Loans and leases	7,074	7,493
Consumer | Consumer real estate | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	135	157
Financing receivable, originated year two	143	158
Financing receivable, originated year three	111	100
Financing receivable, originated year four	78	77
Financing receivable, originated year five	107	92
Financing receivable, originated prior to year five	119	197
Revolving loans	164	186
Revolving Loans converted to term loans	24	29
Loans and leases	881	996
Consumer | Consumer real estate | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	98	122
Financing receivable, originated year two	109	107
Financing receivable, originated year three	78	78
Financing receivable, originated year four	55	76
Financing receivable, originated year five	117	73
Financing receivable, originated prior to year five	131	221
Revolving loans	146	177
Revolving Loans converted to term loans	25	34
Loans and leases	759	888
Consumer | Consumer real estate | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	99	130
Financing receivable, originated year two	137	141
Financing receivable, originated year three	101	123
Financing receivable, originated year four	97	75
Financing receivable, originated year five	148	85
Financing receivable, originated prior to year five	147	296
Revolving loans	215	264
Revolving Loans converted to term loans	48	59
Loans and leases	992	1,173
Consumer | Consumer real estate | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	15	45
Financing receivable, originated year two	33	61
Financing receivable, originated year three	51	37
Financing receivable, originated year four	23	28
Financing receivable, originated year five	65	35
Financing receivable, originated prior to year five	67	127
Revolving loans	71	92
Revolving Loans converted to term loans	31	36
Loans and leases	356	461
Consumer | Consumer real estate | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	226	107
Financing receivable, originated year two	52	36
Financing receivable, originated year three	30	52
Financing receivable, originated year four	41	54
Financing receivable, originated year five	193	95
Financing receivable, originated prior to year five	100	261
Revolving loans	48	61
Revolving Loans converted to term loans	35	48
Loans and leases	725	714
Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	107	122
Financing receivable, originated year two	65	91
Financing receivable, originated year three	55	107
Financing receivable, originated year four	52	78
Financing receivable, originated year five	39	63
Financing receivable, originated prior to year five	184	279
Revolving loans	423	373
Revolving Loans converted to term loans	13	15
Loans and leases	938	1,128
Consumer | Credit Card and Other | FICO score 740 or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	55	57
Financing receivable, originated year two	38	52
Financing receivable, originated year three	33	59
Financing receivable, originated year four	27	37
Financing receivable, originated year five	18	23
Financing receivable, originated prior to year five	70	116
Revolving loans	212	159
Revolving Loans converted to term loans	5	5
Loans and leases	458	508
Consumer | Credit Card and Other | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	9	7
Financing receivable, originated year two	6	7
Financing receivable, originated year three	5	9
Financing receivable, originated year four	4	8
Financing receivable, originated year five	4	8
Financing receivable, originated prior to year five	20	27
Revolving loans	39	91
Revolving Loans converted to term loans	2	2
Loans and leases	89	159
Consumer | Credit Card and Other | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	6	9
Financing receivable, originated year two	6	8
Financing receivable, originated year three	5	9
Financing receivable, originated year four	5	8
Financing receivable, originated year five	4	4
Financing receivable, originated prior to year five	24	38
Revolving loans	42	37
Revolving Loans converted to term loans	1	3
Loans and leases	93	116
Consumer | Credit Card and Other | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	22	30
Financing receivable, originated year two	7	12
Financing receivable, originated year three	6	15
Financing receivable, originated year four	7	9
Financing receivable, originated year five	6	9
Financing receivable, originated prior to year five	33	48
Revolving loans	93	46
Revolving Loans converted to term loans	2	3
Loans and leases	176	172
Consumer | Credit Card and Other | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	3	5
Financing receivable, originated year two	3	5
Financing receivable, originated year three	3	7
Financing receivable, originated year four	4	5
Financing receivable, originated year five	3	10
Financing receivable, originated prior to year five	19	24
Revolving loans	21	20
Revolving Loans converted to term loans	1	1
Loans and leases	57	77
Consumer | Credit Card and Other | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, originated year one	12	14
Financing receivable, originated year two	5	7
Financing receivable, originated year three	3	8
Financing receivable, originated year four	5	11
Financing receivable, originated year five	4	9
Financing receivable, originated prior to year five	18	26
Revolving loans	16	20
Revolving Loans converted to term loans	2	1
Loans and leases	65	96
HELOC | Consumer | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	2,041	$ 2,420
Revolving loans converted to term loan during period	34
Credit Card And Other, Other Consumer Loans | Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving loans converted to term loan during period	$ 4

Loans and Leases - Accruing And

Loans and Leases - Accruing And Non-Accruing Loans By Class (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	$ 54,989	$ 57,730
Total Accruing	55,088	57,847
Current, Non-Accruing	215	205
Total Non-Accruing	347	386
Loans and leases	55,435	58,232
30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	83	100
Past Due, Non-Accruing	16	66
90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	16	17
Past Due, Non-Accruing	116	115
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	31,335	32,945
Total Accruing	31,372	32,960
Current, Non-Accruing	119	88
Total Non-Accruing	144	144
Loans and leases	31,516	33,104
Commercial | Commercial and industrial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	36	15
Past Due, Non-Accruing	9	12
Commercial | Commercial and industrial | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	1	0
Past Due, Non-Accruing	16	44
Commercial | Commercial and industrial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	26,196	27,541
Total Accruing	26,233	27,556
Current, Non-Accruing	119	88
Total Non-Accruing	144	144
Nonaccrual, no allowance	129	101
Loans and leases	26,377	27,700
Commercial | Commercial and industrial | C&I | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	36	15
Past Due, Non-Accruing	9	12
Commercial | Commercial and industrial | C&I | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	1	0
Past Due, Non-Accruing	16	44
Commercial | Commercial and industrial | Loans to mortgage companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	5,139	5,404
Total Accruing	5,139	5,404
Current, Non-Accruing	0	0
Total Non-Accruing	0	0
Loans and leases	5,139	5,404
Commercial | Commercial and industrial | Loans to mortgage companies | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	0	0
Past Due, Non-Accruing	0	0
Commercial | Commercial and industrial | Loans to mortgage companies | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	0	0
Past Due, Non-Accruing	0	0
Commercial | Commercial and industrial | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual, no allowance	52
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	12,194	12,275
Commercial | Commercial real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing		12,194
Total Accruing		12,217
Current, Non-Accruing		10
Total Non-Accruing		58
Loans and leases	12,194	12,275
Commercial | Commercial real estate | CRE | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing		23
Past Due, Non-Accruing		42
Commercial | Commercial real estate | CRE | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing		0
Past Due, Non-Accruing		6
Commercial real estate | Commercial real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	12,120
Total Accruing	12,136
Current, Non-Accruing	8
Total Non-Accruing	58
Loans and leases	12,194
Commercial real estate | Commercial real estate | CRE | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	15
Past Due, Non-Accruing	0
Commercial real estate | Commercial real estate | CRE | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	1
Past Due, Non-Accruing	50
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	10,787	11,725
Consumer | Consumer Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	10,604	11,474
Total Accruing	10,644	11,543
Current, Non-Accruing	88	106
Total Non-Accruing	143	182
Loans and leases	10,787	11,725
Consumer | Consumer Real Estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	28	53
Past Due, Non-Accruing	6	12
Consumer | Consumer Real Estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	12	16
Past Due, Non-Accruing	49	64
Consumer | Consumer Real Estate | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	1,979	2,336
Total Accruing	1,991	2,360
Current, Non-Accruing	37	43
Total Non-Accruing	50	60
Nonaccrual, no allowance	7
Loans and leases	2,041	2,420
Consumer | Consumer Real Estate | HELOC | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	5	13
Past Due, Non-Accruing	2	3
Consumer | Consumer Real Estate | HELOC | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	7	11
Past Due, Non-Accruing	11	14
Consumer | Consumer Real Estate | Real estate installment loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	8,625	9,138
Total Accruing	8,653	9,183
Current, Non-Accruing	51	63
Total Non-Accruing	93	122
Nonaccrual, no allowance	52
Loans and leases	8,746	9,305
Consumer | Consumer Real Estate | Real estate installment loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	23	40
Past Due, Non-Accruing	4	9
Consumer | Consumer Real Estate | Real estate installment loans | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	5	5
Past Due, Non-Accruing	38	50
Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	930	1,117
Total Accruing	936	1,127
Current, Non-Accruing	0	1
Total Non-Accruing	2	2
Loans and leases	938	1,128
Consumer | Credit Card and Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	4	9
Past Due, Non-Accruing	1	0
Consumer | Credit Card and Other | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	2	1
Past Due, Non-Accruing	1	1
Consumer | Credit Card and Other | Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	274	279
Total Accruing	279	283
Current, Non-Accruing	0	0
Total Non-Accruing	0	0
Loans and leases	279	283
Consumer | Credit Card and Other | Credit Card | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	3	3
Past Due, Non-Accruing	0	0
Consumer | Credit Card and Other | Credit Card | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	2	1
Past Due, Non-Accruing	0	0
Consumer | Credit Card and Other | Other Consumer Loans Class
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, Accruing	656	838
Total Accruing	657	844
Current, Non-Accruing	0	1
Total Non-Accruing	2	2
Loans and leases	659	845
Consumer | Credit Card and Other | Other Consumer Loans Class | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	1	6
Past Due, Non-Accruing	1	0
Consumer | Credit Card and Other | Other Consumer Loans Class | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due, Accruing	0	0
Past Due, Non-Accruing	$ 1	$ 1

Loans and Leases - Schedule O_2

Loans and Leases - Schedule Of Troubled Debt Restructurings Occurring During The Year (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | loan	21	186	131	292
Pre-Modification Outstanding Recorded  Investment	$ 8	$ 151	$ 59	$ 172
Post-Modification Outstanding Recorded  Investment	$ 7	$ 140	$ 54	$ 160
Consumer | Credit Card and Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | loan	8	10	36	50
Pre-Modification Outstanding Recorded  Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded  Investment	$ 0	$ 0	$ 0	$ 0
C&I | Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | loan	5	83	32	87
Pre-Modification Outstanding Recorded  Investment	$ 8	$ 130	$ 37	$ 141
Post-Modification Outstanding Recorded  Investment	$ 7	$ 120	$ 34	$ 129
CRE | Commercial | Consumer Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | loan	0	14	1	14
Pre-Modification Outstanding Recorded  Investment	$ 0	$ 12	$ 12	$ 12
Post-Modification Outstanding Recorded  Investment	$ 0	$ 12	$ 10	$ 12
HELOC | Consumer | Consumer Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | loan	2	35	21	47
Pre-Modification Outstanding Recorded  Investment	$ 0	$ 3	$ 2	$ 4
Post-Modification Outstanding Recorded  Investment	$ 0	$ 2	$ 2	$ 4
Real estate installment loans | Consumer | Consumer Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | loan	6	44	41	94
Pre-Modification Outstanding Recorded  Investment	$ 0	$ 6	$ 8	$ 15
Post-Modification Outstanding Recorded  Investment	$ 0	$ 6	$ 8	$ 15

Loans and Leases - Schedule O_3

Loans and Leases - Schedule Of Troubled Debt Restructurings Within The Previous 12 Months (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | loan	12	14	35	45
Recorded Investment | $	$ 14	$ 1	$ 28	$ 1
Consumer | Credit Card and Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | loan	1	7	2	21
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
C&I | Commercial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | loan	6	0	18	0
Recorded Investment | $	$ 3	$ 0	$ 5	$ 0
CRE | Commercial | Consumer Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | loan	4	0	6	0
Recorded Investment | $	$ 10	$ 0	$ 19	$ 0
HELOC | Consumer | Consumer Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | loan	0	1	1	8
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Real estate installment loans | Consumer | Consumer Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number | loan	1	6	8	16
Recorded Investment | $	$ 1	$ 1	$ 4	$ 1

Allowance for Credit Losses - N

Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan and lease losses	$ 734	$ 815	$ 963	$ 988	$ 538	$ 307
COVID-19 Deferrals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan and lease losses	$ 1		$ 1

Allowance for Credit Losses - R

Allowance for Credit Losses - Rollforward of Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 815	$ 538	$ 963	$ 307
Charge-offs	(19)	(78)	(48)	(115)
Recoveries	16	11	47	24
Provision for credit losses	(85)	227	(245)	502
Ending balance	734	988	734	988
Loans and leases	55,435		55,435		$ 58,232
Financial Asset Acquired with Credit Deterioration
Allowance for Loan and Lease Losses [Roll Forward]
Initial allowance on loans purchased with credit deterioration		287		287
Funded commitment
Allowance for Loan and Lease Losses [Roll Forward]
Provision for credit losses	(78)	230	(228)	485
Unfunded commitment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	75	51	85	31
Initial reserve on loans acquired		41		41
Provision for credit losses	(7)	(3)	(17)	17
Ending balance	68	89	68	89
Commercial | Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	385	319	453	142
Charge-offs	(11)	(69)	(27)	(95)
Recoveries	7	3	18	5
Ending balance	374	489	374	489
Loans and leases	31,516		31,516		33,104
Commercial | Commercial and industrial | Financial Asset Acquired with Credit Deterioration
Allowance for Loan and Lease Losses [Roll Forward]
Initial allowance on loans purchased with credit deterioration		138		138
Commercial | Commercial and industrial | Paycheck Protection Plan
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases	2,000		2,000		4,100
Commercial | Commercial and industrial | Funded commitment
Allowance for Loan and Lease Losses [Roll Forward]
Provision for credit losses	(7)	98	(70)	299
Commercial | Commercial and industrial | Unfunded commitment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	57	37	65	21
Initial reserve on loans acquired		12		12
Provision for credit losses	(8)	(2)	(16)	14
Ending balance	49	47	49	47
Commercial | Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	210	57	242	29
Charge-offs	(2)	(4)	(5)	(4)
Recoveries	2	2	5	3
Ending balance	162	208	162	208
Loans and leases	12,194		12,194		12,275
Commercial | Commercial Real Estate | Financial Asset Acquired with Credit Deterioration
Allowance for Loan and Lease Losses [Roll Forward]
Initial allowance on loans purchased with credit deterioration		100		100
Commercial | Commercial Real Estate | Funded commitment
Allowance for Loan and Lease Losses [Roll Forward]
Provision for credit losses	(48)	53	(80)	80
Commercial | Commercial Real Estate | Unfunded commitment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	9	6	10	4
Initial reserve on loans acquired		26		26
Provision for credit losses	1	(1)	0	1
Ending balance	10	31	10	31
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases	10,787		10,787		11,725
Consumer | Consumer Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	203	144	242	121
Charge-offs	(1)	(2)	(5)	(6)
Recoveries	7	5	21	13
Ending balance	179	265	179	265
Loans and leases	10,787		10,787		11,725
Consumer | Consumer Real Estate | Financial Asset Acquired with Credit Deterioration
Allowance for Loan and Lease Losses [Roll Forward]
Initial allowance on loans purchased with credit deterioration		44		44
Consumer | Consumer Real Estate | Funded commitment
Allowance for Loan and Lease Losses [Roll Forward]
Provision for credit losses	(30)	74	(79)	93
Consumer | Consumer Real Estate | Unfunded commitment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	9	8	10	6
Initial reserve on loans acquired		3		3
Provision for credit losses	0	0	(1)	2
Ending balance	9	11	9	11
Consumer | Credit Card and Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	17	18	26	15
Charge-offs	(5)	(3)	(11)	(10)
Recoveries	0	1	3	3
Ending balance	19	26	19	26
Loans and leases	938		938		$ 1,128
Consumer | Credit Card and Other | Financial Asset Acquired with Credit Deterioration
Allowance for Loan and Lease Losses [Roll Forward]
Initial allowance on loans purchased with credit deterioration		5		5
Consumer | Credit Card and Other | Funded commitment
Allowance for Loan and Lease Losses [Roll Forward]
Provision for credit losses	7	5	1	13
Consumer | Credit Card and Other | Unfunded commitment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	0	0	0
Initial reserve on loans acquired		0		0
Provision for credit losses	0	0	0	0
Ending balance	$ 0	$ 0	$ 0	$ 0

Mortgage Banking Activity - Nar

Mortgage Banking Activity - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Mortgage Banking [Line Items]
Net loans and leases	$ 54,701		$ 54,701		$ 57,269
Mortgage banking and title income	34	$ 66	126	$ 72
Mortgage banking and title income
Mortgage Banking [Line Items]
Mortgage banking and title income	1	$ 1	2	$ 1
First Horizon Bank
Mortgage Banking [Line Items]
Net loans and leases	$ 48		$ 48

Mortgage Banking Activity - Res

Mortgage Banking Activity - Residential Mortgage Loans (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Balance at beginning of period	$ 1,022
Balance at end of period	1,052	$ 1,022
Mortgage loans
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Balance at beginning of period	409	4
Acquired	0	320
Originations and purchases	2,154	2,499
Sales, net of gains	(2,302)	(2,405)
Mortgage loans transferred from (to) held for investment	30	(9)
Balance at end of period	$ 291	$ 409

Mortgage Banking Activity - MSR

Mortgage Banking Activity - MSR Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Mortgage Banking [Abstract]
Gross Carrying Amount	$ 36	$ 28
Accumulated Amortization	(7)	(3)
Net Carrying Amount	$ 29	$ 25

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Narrative (Details) $ in Millions	Jul. 01, 2020USD ($)	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)	Jul. 17, 2020USD ($)branch	Dec. 31, 2019USD ($)
Goodwill [Line Items]
Purchase accounting gain		$ 0	$ 532	$ (1)	$ 532
Goodwill		$ 1,511		$ 1,511		$ 1,511		$ 1,433
IBERIABANK (IBKC)
Goodwill [Line Items]
Purchase accounting gain	$ 531					531
Truist Bank Branches
Goodwill [Line Items]
Number of bank branches | branch							30
Goodwill						$ 78	$ 78

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Summary Of Gross Goodwill And Accumulated Impairment Losses And Write-Offs Detailed By Reportable Segments (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,511	$ 1,433
Additions and adjustments	0	78
Goodwill, ending balance	1,511	1,511
Regional Banking
Goodwill [Roll Forward]
Goodwill, beginning balance	880	802
Additions and adjustments	0	78
Goodwill, ending balance	880	880
Specialty Banking
Goodwill [Roll Forward]
Goodwill, beginning balance	631	631
Additions and adjustments	0	0
Goodwill, ending balance	$ 631	$ 631

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Summary Of Intangible Assets and Accumulated Amortization Included In The Consolidated Statements of Condition (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Intangible Assets [Line Items]
Gross Carrying Amount	$ 449	$ 449
Accumulated Amortization	(138)	(95)
Net Carrying Value	311	354
Core deposit intangibles
Intangible Assets [Line Items]
Gross Carrying Amount	371	371
Accumulated Amortization	(117)	(81)
Net Carrying Value	254	290
Customer relationships
Intangible Assets [Line Items]
Gross Carrying Amount	37	37
Accumulated Amortization	(10)	(8)
Net Carrying Value	27	29
Other
Intangible Assets [Line Items]
Gross Carrying Amount	41	41
Accumulated Amortization	(11)	(6)
Net Carrying Value	$ 30	$ 35

Preferred Stock - Non-Cumulativ

Preferred Stock - Non-Cumulative Perpetual Preferred Stock (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Shares Outstanding, preferred (in shares)		26,750
Liquidation Amount		$ 538
Carrying Amount		$ 520	$ 470
Series A
Class of Stock [Line Items]
Annual Dividend Rate		6.20%
Shares Outstanding, preferred (in shares)		0
Liquidation Amount		$ 0
Carrying Amount		$ 0	95
Series B
Class of Stock [Line Items]
Annual Dividend Rate		6.625%
Shares Outstanding, preferred (in shares)		8,000
Liquidation Amount		$ 80
Carrying Amount		$ 77	77
Series B | LIBOR | Beginning on or after August 1, 2025
Class of Stock [Line Items]
Basis spread on variable rate		426.20%
Series C
Class of Stock [Line Items]
Annual Dividend Rate		6.60%
Shares Outstanding, preferred (in shares)		5,750
Liquidation Amount		$ 58
Carrying Amount		$ 59	59
Series C | LIBOR | Beginning on or after May 1, 2026
Class of Stock [Line Items]
Basis spread on variable rate		492.00%
Series D
Class of Stock [Line Items]
Annual Dividend Rate		6.10%
Shares Outstanding, preferred (in shares)		10,000
Liquidation Amount		$ 100
Carrying Amount		$ 94	94
Series D | LIBOR | Beginning on or after May 1, 2024
Class of Stock [Line Items]
Basis spread on variable rate		385.90%
Series E
Class of Stock [Line Items]
Annual Dividend Rate		6.50%
Shares Outstanding, preferred (in shares)		1,500
Liquidation Amount		$ 150
Carrying Amount		$ 145	145
Series F
Class of Stock [Line Items]
Annual Dividend Rate	4.70%	4.70%
Shares Outstanding, preferred (in shares)		1,500
Liquidation Amount		$ 150
Carrying Amount	$ 145	$ 145	$ 0

Preferred Stock - Narrative (De

Preferred Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Preferred stock issuance	$ 145	$ 144
Carrying Amount			$ 520	$ 470
Liquidation Amount			$ 538
Call of preferred stock	100
Preferred stock, shares issued (in shares)			26,750	26,250
Noncontrolling interest			$ 295	$ 295
Retained Earnings
Class of Stock [Line Items]
Call of preferred stock	5		$ 5
Series F
Class of Stock [Line Items]
Preferred stock issuance	$ 150
Annual Dividend Rate	4.70%		4.70%
Carrying Amount	$ 145		$ 145	0
Liquidation Amount			$ 150
Series A
Class of Stock [Line Items]
Annual Dividend Rate			6.20%
Carrying Amount			$ 0	95
Liquidation Amount			0
Series A | Other Liabilities
Class of Stock [Line Items]
Liquidation Amount			$ 100
Preferred Class A
Class of Stock [Line Items]
Annual Dividend Rate			3.75%
Preferred stock, shares issued (in shares)			300,000
Preferred stock, liquidation preference per share (in dollars per share)			$ 1,000
Noncontrolling interest			$ 295	$ 295
Preferred Class A | LIBOR
Class of Stock [Line Items]
Basis spread on variable rate			0.85%

Components of Other Comprehen_3

Components of Other Comprehensive Income (Loss) - Schedule of Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	$ 8,565	$ 8,307	$ 8,307	$ 5,208	$ 5,056	$ 5,076	$ 8,307	$ 5,076
Net unrealized gains (losses)	(41)			(7)			(108)	95
Amounts reclassified from AOCI	3			1			7	4
Other comprehensive income (loss)	(38)	38	(101)	(6)	1	104	(101)	99
Balance, end of period	8,532	8,565	8,307	8,144	5,208	5,056	8,532	8,144
Securities AFS
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	43		108	118		31	108	31
Net unrealized gains (losses)	(38)			(6)			(103)	81
Amounts reclassified from AOCI	0			1			0	1
Other comprehensive income (loss)	(38)			(5)			(103)	82
Balance, end of period	5	43		113	118		5	113
Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	8		12	16		3	12	3
Net unrealized gains (losses)	0			(1)			(1)	14
Amounts reclassified from AOCI	(1)			(2)			(4)	(4)
Other comprehensive income (loss)	(1)			(3)			(5)	10
Balance, end of period	7	8		13	16		7	13
Pension and Post-retirement Plans
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	(254)		(260)	(268)		(273)	(260)	(273)
Net unrealized gains (losses)	(3)			0			(4)	0
Amounts reclassified from AOCI	4			2			11	7
Other comprehensive income (loss)	1			2			7	7
Balance, end of period	(253)	(254)		(266)	(268)		(253)	(266)
Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	(203)		$ (140)	(134)		$ (239)	(140)	(239)
Balance, end of period	$ (241)	$ (203)		$ (140)	$ (134)		$ (241)	$ (140)

Components of Other Comprehen_4

Components of Other Comprehensive Income (Loss) - Schedule of Reclassification from AOCI (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest and fees on loans and leases	$ 482			$ 557			$ 1,485	$ 1,190
Income tax expense (benefit)	63			2			222	20
Other expense	60			52			182	124
Amounts reclassified from AOCI	(235)	$ (311)	$ (236)	(539)	$ (57)	$ (16)	(781)	(612)
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from AOCI	3			1			7	4
Reclassification out of Accumulated Other Comprehensive Income | Securities AFS
Accumulated Other Comprehensive Income (Loss) [Line Items]
Securities gains (losses), net	0			1			0	1
Income tax expense (benefit)	0			0			0	0
Amounts reclassified from AOCI	0			1			0	1
Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest and fees on loans and leases	(2)			(2)			(6)	(5)
Income tax expense (benefit)	1			0			2	1
Amounts reclassified from AOCI	(1)			(2)			(4)	(4)
Reclassification out of Accumulated Other Comprehensive Income | Pension and Post-retirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)	1			(1)			2	(2)
Other expense	3			3			9	9
Amounts reclassified from AOCI	$ 4			$ 2			$ 11	$ 7

Earnings Per Share - Schedule O

Earnings Per Share - Schedule Of Reconciliation Of Net Income/(Loss) to Net Income/(Loss) Available to Common Shareholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 235	$ 311	$ 236	$ 539	$ 57	$ 16	$ 781	$ 612
Net income attributable to noncontrolling interest	3			3			9	8
Net income attributable to controlling interest	232			536			772	604
Preferred stock dividends	8			13			29	16
Net income available to common shareholders	$ 224			$ 523			$ 743	$ 588
Weighted average common shares outstanding - basic (in shares)	545,818			549,690			549,434	391,699
Effect of dilutive securities (in shares)	4,001			1,156			4,765	1,014
Weighted average common shares outstanding - diluted (in shares)	549,819			550,846			554,199	392,713
Basic earnings per common share (in dollars per share)	$ 0.41			$ 0.95			$ 1.35	$ 1.50
Diluted earnings per common share (in dollars per share)	$ 0.41			$ 0.95			$ 1.34	$ 1.50

Earnings Per Share - Schedule_2

Earnings Per Share - Schedule Of Anti-Dilutive Options and Awards (Details) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average exercise price of stock options excluded from the calculation of diluted EPS (in dollars per share)	$ 17.75	$ 15.32	$ 20.64	$ 17.05
Employee Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options and other awards excluded from the calculation of diluted EPS (in shares)	2,901	8,306	1,431	4,564
Other Equity Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options and other awards excluded from the calculation of diluted EPS (in shares)	2,464	6,824	1,394	4,826

Contingencies And Other Discl_2

Contingencies And Other Disclosures (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Estimated litigation liability	$ 1,000,000
Accrued losses on loan repurchase exposure	16,000,000	$ 16,000,000
Minimum
Loss Contingencies [Line Items]
Estimated litigation liability	0
Maximum
Loss Contingencies [Line Items]
Estimated litigation liability	$ 6,000,000

Retirement Plans - Narrative (D

Retirement Plans - Narrative (Details) - Pension Plan - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021	Sep. 30, 2021
Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected future employer contributions, current fiscal year	$ 0
Qualified Plan | Forecast
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected future employer contributions, current fiscal year		$ 0
Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Pension plan contribution	$ 5,000,000
Defined benefit plan, expected future employer contributions, current fiscal year			$ 5,000,000

Retirement Plans - Schedule Of

Retirement Plans - Schedule Of Components Of Net Periodic Benefit Cost (Details) - Pension Plan - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Components of net periodic benefit cost
Interest cost	$ 4	$ 6	$ 12	$ 17
Expected return on plan assets	(7)	(7)	(15)	(19)
Actuarial (gain) loss	2	3	6	10
Other			2	0
Net periodic benefit cost	$ (1)	$ 2	$ 5	$ 8

Business Segment Information -

Business Segment Information - Amounts of Consolidated Revenue, Expense, Tax and Assets by Segment (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Net interest income (expense)	$ 492			$ 532			$ 1,496	$ 1,140
Provision for credit losses	(85)			227			(245)	502
Noninterest income	247			823			829	1,204
Noninterest expense	526			587			1,567	1,210
Income before income taxes	298			541			1,003	632
Income tax expense (benefit)	63			2			222	20
Net income	235	$ 311	$ 236	539	$ 57	$ 16	781	612
Average assets	88,401			81,683			87,131	57,810
Regional Banking
Disaggregation of Revenue [Line Items]
Net interest income (expense)	444			448			1,314	853
Provision for credit losses	(52)			194			(172)	394
Noninterest income	112			97			320	239
Noninterest expense	301			301			851	639
Income before income taxes	307			50			955	59
Income tax expense (benefit)	72			9			223	7
Net income	235			41			732	52
Average assets	40,722			43,703			41,757	27,962
Specialty Banking
Disaggregation of Revenue [Line Items]
Net interest income (expense)	154			161			464	400
Provision for credit losses	(33)			34			(61)	106
Noninterest income	142			181			476	410
Noninterest expense	141			138			441	359
Income before income taxes	188			170			560	345
Income tax expense (benefit)	45			41			135	84
Net income	143			129			425	261
Average assets	20,460			21,693			20,669	18,885
Corporate
Disaggregation of Revenue [Line Items]
Net interest income (expense)	(106)			(77)			(282)	(113)
Provision for credit losses	0			(1)			(12)	2
Noninterest income	(7)			545			33	555
Noninterest expense	84			148			275	212
Income before income taxes	(197)			321			(512)	228
Income tax expense (benefit)	(54)			(48)			(136)	(71)
Net income	(143)			369			(376)	299
Average assets	$ 27,219			$ 16,287			24,705	$ 10,963
Asset impairment charges							$ 35

Business Segment Information _2

Business Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Noninterest income:
Fixed income	$ 96,000	$ 111,000	$ 324,000	$ 319,000
Deposit transactions and cash management	44,000	42,000	130,000	103,000
Mortgage banking and title income	34,000	66,000	126,000	72,000
Brokerage, management fees and commissions	24,000	18,000	65,000	47,000
Bankcard income	15,000	10,000	40,000	24,000
Trust services and investment management	13,000	12,000	39,000	27,000
Securities gains (losses), net	1,000	(1,000)	12,000	(2,000)
Loss on debt extinguishment	(23,000)	0	(23,000)	0
Purchase accounting gain	0	532,000	(1,000)	532,000
Other income	43,000	33,000	117,000	82,000
Total noninterest income	247,000	823,000	829,000	1,204,000
Regional Banking
Noninterest income:
Fixed income	0	0	1,000	1,000
Deposit transactions and cash management	39,000	38,000	117,000	91,000
Mortgage banking and title income	0	0	0	0
Brokerage, management fees and commissions	24,000	18,000	65,000	47,000
Bankcard income	14,000	10,000	37,000	23,000
Trust services and investment management	13,000	12,000	39,000	27,000
Securities gains (losses), net	0	0	0	0
Loss on debt extinguishment	0		0
Purchase accounting gain		0	0	0
Other income	22,000	19,000	61,000	50,000
Total noninterest income	112,000	97,000	320,000	239,000
Specialty Banking
Noninterest income:
Fixed income	96,000	111,000	323,000	318,000
Deposit transactions and cash management	3,000	2,000	8,000	8,000
Mortgage banking and title income	33,000	66,000	124,000	71,000
Brokerage, management fees and commissions	0	0	0	0
Bankcard income	1,000	0	2,000	1,000
Trust services and investment management	0	0	0	0
Securities gains (losses), net	0	0	0	0
Loss on debt extinguishment	0		0
Purchase accounting gain		0	0	0
Other income	9,000	2,000	19,000	12,000
Total noninterest income	142,000	181,000	476,000	410,000
Corporate
Noninterest income:
Fixed income	0	0	0	0
Deposit transactions and cash management	2,000	2,000	5,000	4,000
Mortgage banking and title income	1,000	0	2,000	1,000
Brokerage, management fees and commissions	0	0	0	0
Bankcard income	0	0	1,000	0
Trust services and investment management	0	0	0	0
Securities gains (losses), net	1,000	(1,000)	12,000	(2,000)
Loss on debt extinguishment	(23,000)		(23,000)
Purchase accounting gain		532,000	(1,000)	532,000
Other income	12,000	12,000	37,000	20,000
Total noninterest income	(7,000)	545,000	33,000	555,000
Underwriting, portfolio advisory, and other noninterest income
Noninterest income:
Revenue from contract with customer	$ 12,000	$ 10,000	$ 35,000	$ 29,000

Variable Interest Entities - Su

Variable Interest Entities - Summary Of VIE Consolidated By FHN (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets
Other assets	$ 3,766	$ 4,062
Liabilities:
Other liabilities	1,617	1,699
Rabbi Trusts used for Deferred Compensation Plans
Assets
Other assets	206	195
Liabilities:
Other liabilities	$ 175	$ 165

Variable Interest Entities - _2

Variable Interest Entities - Summary of the Impact of Qualifying LIHTC Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Low income housing tax credits
Variable Interest Entity [Line Items]
Amortization of qualifying LIHTC investments	$ 9	$ 8	$ 26	$ 20
Low income housing tax credits and other tax benefits related to qualifying LIHTC investments	(8)	(7)	(25)	(16)
Other tax benefits related to qualifying LIHTC investments
Variable Interest Entity [Line Items]
Low income housing tax credits and other tax benefits related to qualifying LIHTC investments	$ (2)	$ (3)	$ (7)	$ (8)

Variable Interest Entities - _3

Variable Interest Entities - Summary Of VIE Not Consolidated By FHN (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Total liabilities	$ 80,005	$ 75,902
Trading securities	1,319	1,176
Term borrowings	1,584	1,670
Securities available-for-sale	8,494	8,047
Securities held to maturity, at fair value	303	10
Low income housing partnerships
Variable Interest Entity [Line Items]
Maximum Loss Exposure	349	338
Maximum loss exposure, contractual funding commitments	116	132
Low income housing partnerships | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total liabilities	116	132
Low income housing partnerships | Other Assets
Variable Interest Entity [Line Items]
Maximum loss exposure, current investments	233	206
Other tax credit investments
Variable Interest Entity [Line Items]
Maximum Loss Exposure	63	64
Other tax credit investments | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total liabilities	42	42
Small issuer trust preferred holdings
Variable Interest Entity [Line Items]
Maximum Loss Exposure	202	210
Small issuer trust preferred holdings | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total liabilities	0	0
On-balance sheet trust preferred securitization
Variable Interest Entity [Line Items]
Maximum Loss Exposure	30	32
Loans and leases	112	112
Trading securities	2	2
Term borrowings	84	82
On-balance sheet trust preferred securitization | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total liabilities	84	82
Holdings of agency mortgage-backed securities
Variable Interest Entity [Line Items]
Maximum Loss Exposure	7,380	7,063
Trading securities	514	845
Securities available-for-sale	6,600	6,200
Securities held to maturity, at fair value	304
Holdings of agency mortgage-backed securities | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total liabilities	0	0
Commercial loan troubled debt restructurings
Variable Interest Entity [Line Items]
Maximum Loss Exposure	117	186
Maximum loss exposure, contractual funding commitments	4	10
Loans and leases	113	176
Commercial loan troubled debt restructurings | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total liabilities	0	0
Proprietary trust preferred issuances
Variable Interest Entity [Line Items]
Maximum Loss Exposure	0	0
Proprietary trust preferred issuances | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total liabilities	$ 184	$ 287

Derivatives - Narrative (Detail

Derivatives - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Collateral cash payables		$ 221		$ 221		$ 347
Total trading revenues		85	$ 99	291	$ 278
Hedged amount of foreign currency denominated loans		10		10		12
Derivative assets		451		451		765
Derivative liability		130		130		125
Visa Class B Shares
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liabilities related to sale		16		16		13
Additional Derivative Agreements | Derivative Instruments With Adjustable Collateral Posting Thresholds
Derivative Instruments, Gain (Loss) [Line Items]
Net fair value of derivative assets with adjustable posting thresholds		93		93		200
Net fair value of derivative liabilities with adjustable posting thresholds		17		17		5
Collateral received		221		221		320
Securities posted collateral		3		3		34
Additional Derivative Agreements | Derivative Instruments With Accelerated Termination Provisions
Derivative Instruments, Gain (Loss) [Line Items]
Net fair value of derivative assets with adjustable posting thresholds		103		103		216
Net fair value of derivative liabilities with adjustable posting thresholds		20		20		17
Collateral received		232		232		343
Securities posted collateral		6		6		53
Counterparties
Derivative Instruments, Gain (Loss) [Line Items]
Collateral cash receivables		180		180		280
Collateral cash payables		111		111		166
Senior Subordinated Notes | Senior Debt Maturing In December 2020
Derivative Instruments, Gain (Loss) [Line Items]
Term borrowings	$ 500
Early repayment of senior debt	$ 500
Derivatives, interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Collateral cash payables		217		217		327
Derivative assets		408		408		702
Derivative liability		95		95		60
Credit Risk Contract
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset, notional amount		234		234		233
Derivative liability, notional amount		512		512		464
Embedded Derivative Financial Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative assets		1		1		1
Derivative liability		$ 1		$ 1		$ 1

Derivatives - Derivatives Assoc

Derivatives - Derivatives Associated with Fixed Income Trading Activities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Customer interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional	$ 3,806	$ 3,950
Assets	113	207
Liabilities	36	7
Offsetting upstream interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional	3,806	3,950
Assets	3	2
Liabilities	17	17
Option contracts purchased
Derivative Instruments, Gain (Loss) [Line Items]
Notional	23
Assets	0
Liabilities	0
Forwards and futures purchased
Derivative Instruments, Gain (Loss) [Line Items]
Notional	9,173	10,795
Assets	6	62
Liabilities	31	0
Forwards and futures sold
Derivative Instruments, Gain (Loss) [Line Items]
Notional	9,737	11,633
Assets	37	1
Liabilities	$ 4	$ 65

Derivatives - Derivatives Ass_2

Derivatives - Derivatives Associated With Interest Rate Risk Management Activities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Customer interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional	$ 3,806	$ 3,950
Assets	113	207
Liabilities	36	7
Offsetting upstream interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional	3,806	3,950
Assets	3	2
Liabilities	17	17
Customer Interest Rate Contracts Hedging | Hedging Instruments And Hedged Items | Customer interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional	7,745	6,868
Assets	260	436
Liabilities	16	1
Customer Interest Rate Contracts Hedging | Hedging Instruments And Hedged Items | Offsetting upstream interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional	7,685	6,868
Assets	3	5
Liabilities	$ 26	$ 35

Derivatives - Gains_(Losses) on

Derivatives - Gains/(Losses) on Derivatives Associated with Interest Rate Risk Management Activities (Details) - Hedging Instruments And Hedged Items - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Customer Interest Rate Contracts Hedging | Customer interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) related to interest rate derivatives	$ (29)	$ (14)	$ (197)	$ 197
Customer Interest Rate Contracts Hedging | Offsetting upstream interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) related to interest rate derivatives	29	14	197	(197)
Debt Hedging | Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) related to interest rate derivatives	0	(1)	0	3
Debt Hedging | Term Borrowings
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses) related to term borrowings	$ 0	$ 1	$ 0	$ (2)

Derivatives - Derivatives Ass_3

Derivatives - Derivatives Associated With Cash Flow Hedges (Details) - Cash Flow Hedge - Hedging Instruments And Hedged Items - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Notional	$ 1,100	$ 1,250
Assets	19	32
Liabilities	0	0
Interest Rate Contract
Derivative Instruments, Gain (Loss) [Line Items]
Variability in cash flows related to debt instruments (primarily loans)	$ 1,100	$ 1,250

Derivatives - Gains_(Losses) _2

Derivatives - Gains/(Losses) on Derivatives Associated with Cash Flow Hedges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(loss) expected to be reclassified to earnings in the next twelve months			$ 20
Hedging Instruments And Hedged Items
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss), cash flow hedges	$ 0	$ (1)	(1)	$ 14
Gain (loss) reclassified from AOCI into interest income	(1)	(2)	(4)	(4)
Hedging Instruments And Hedged Items | Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss), cash flow hedges	$ (6)	$ (8)	$ (20)	$ 10

Derivatives - Notional and Fair

Derivatives - Notional and Fair Value of Mortgage Banking Hedges (Details) - Mortgage Banking Hedges - Hedged Items - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Option contracts written
Derivative [Line Items]
Notional	$ 419	$ 667
Assets	7	20
Liabilities	0	0
Forward contracts purchased
Derivative [Line Items]
Notional	522	725
Assets	3	0
Liabilities	$ 0	$ 6

Derivatives - Gains_(Losses) _3

Derivatives - Gains/(Losses) on Derivatives Associated with Mortgage Banking Hedges (Details) - Mortgage Banking Hedges - Hedged Items - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Option contracts written
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments	$ (3)	$ 7	$ (12)	$ 7
Forward contracts purchased
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments	$ (2)	$ (10)	$ 10	$ (10)

Derivatives - Derivative Assets

Derivatives - Derivative Assets and Collateral Received (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Gross amounts of recognized assets	$ 451	$ 765
Derivative liabilities available for offset	0	0
Net amount	451	765
Derivative liabilities available for offset	(51)	(21)
Collateral received	(221)	(347)
Net amount	179	397
Derivative assets not subject to master netting agreements	4	4
Derivatives, interest rate contracts
Derivative [Line Items]
Gross amounts of recognized assets	408	702
Derivative liabilities available for offset	0	0
Net amount	408	702
Derivative liabilities available for offset	(31)	(7)
Collateral received	(217)	(327)
Net amount	160	368
Forward contracts
Derivative [Line Items]
Gross amounts of recognized assets	43	63
Derivative liabilities available for offset	0	0
Net amount	43	63
Derivative liabilities available for offset	(20)	(14)
Collateral received	(4)	(20)
Net amount	$ 19	$ 29

Derivatives - Derivative Liabil

Derivatives - Derivative Liabilities and Collateral Pledged (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Gross amounts of recognized liabilities	$ 130	$ 125
Derivative assets available for offset	0	0
Derivative liability	130	125
Derivative assets  available for offset	(51)	(21)
Collateral pledged	(21)	(82)
Net amount	58	22
Derivative liabilities not subject to master netting agreements	17	22
Derivatives, interest rate contracts
Derivative [Line Items]
Gross amounts of recognized liabilities	95	60
Derivative assets available for offset	0	0
Derivative liability	95	60
Derivative assets  available for offset	(31)	(7)
Collateral pledged	(9)	(31)
Net amount	55	22
Forward contracts
Derivative [Line Items]
Gross amounts of recognized liabilities	35	65
Derivative assets available for offset	0	0
Derivative liability	35	65
Derivative assets  available for offset	(20)	(14)
Collateral pledged	(12)	(51)
Net amount	$ 3	$ 0

Master Netting and Similar Ag_3

Master Netting and Similar Agreements—Repurchase, Reverse Repurchase, and Securities Borrowing Transactions - Securities Purchased Under Agreements To Resell And Collateral Pledged By Counterparties (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Securities Purchased under Agreements to Resell [Abstract]
Gross amounts of recognized assets	$ 355	$ 380
Gross amounts offset in the Balance Sheets	0	0
Net amounts of assets presented in the Balance Sheets	355	380
Offsetting securities sold under agreements to repurchase	(12)	0
Securities collateral (not recognized on FHN’s Balance Sheets)	(341)	(379)
Net amount	$ 2	$ 1

Master Netting and Similar Ag_4

Master Netting and Similar Agreements—Repurchase, Reverse Repurchase, and Securities Borrowing Transactions - Securities Sold Under Agreements To Repurchase And Collateral Pledged By Company (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Securities Sold under Agreements to Repurchase [Abstract]
Gross amounts of recognized liabilities	$ 1,299	$ 1,187
Gross amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	1,299	1,187
Offsetting securities purchased under agreements to resell	(12)	0
Securities/ government guaranteed loans collateral	(1,287)	(1,187)
Net amount	$ 0	$ 0

Master Netting and Similar Ag_5

Master Netting and Similar Agreements—Repurchase, Reverse Repurchase, and Securities Borrowing Transactions - Schedule of the Remaining Contractual Maturity by Collateral Type of Securities Sold Under Agreements To Repurchase (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	$ 1,299	$ 1,187
Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	1,299	1,187
Up to 30 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	0	0
U.S. treasuries
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	17	284
U.S. treasuries | Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	17	284
U.S. treasuries | Up to 30 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	0	0
Government agency issued MBS
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	1,097	616
Government agency issued MBS | Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	1,097	616
Government agency issued MBS | Up to 30 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	0	0
Government agency issued CMO
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	1	10
Government agency issued CMO | Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	1	10
Government agency issued CMO | Up to 30 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	0	0
Other U.S. government agencies
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	51	151
Other U.S. government agencies | Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	51	151
Other U.S. government agencies | Up to 30 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	0	0
Government guaranteed loans (SBA and USDA)
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	133	126
Government guaranteed loans (SBA and USDA) | Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	133	126
Government guaranteed loans (SBA and USDA) | Up to 30 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities sold under agreements to repurchase	$ 0	$ 0

Fair Value of Assets and Liab_3

Fair Value of Assets and Liabilities - Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	$ 1,319	$ 1,176
Loans held-for-sale	301	405
Loans held for investment	0	16
Securities available for sale at fair value	8,494	8,047
Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held-for-sale	301	405
Loans held for investment		16
Securities available for sale at fair value	8,494	8,047
Total other assets	608	912
Total assets	10,722	10,556
Total other liabilities	147	149
Total liabilities	462	502
Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held-for-sale	0	0
Loans held for investment		0
Securities available for sale at fair value	0	0
Total other assets	201	206
Total assets	201	206
Total other liabilities	35	71
Total liabilities	35	71
Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held-for-sale	277	393
Loans held for investment		0
Securities available for sale at fair value	8,478	8,015
Total other assets	407	706
Total assets	10,481	10,290
Total other liabilities	96	64
Total liabilities	411	417
Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held-for-sale	24	12
Loans held for investment		16
Securities available for sale at fair value	16	32
Total other assets	0	0
Total assets	40	60
Total other liabilities	16	14
Total liabilities	16	14
Deferred compensation mutual funds | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	127	118
Deferred compensation mutual funds | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	127	118
Deferred compensation mutual funds | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	0	0
Deferred compensation mutual funds | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	0	0
Equity, mutual funds, and other | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	28	25
Equity, mutual funds, and other | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	28	25
Equity, mutual funds, and other | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	0	0
Equity, mutual funds, and other | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	0	0
Derivatives, forwards and futures | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	46	63
Total other liabilities	35	71
Derivatives, forwards and futures | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	46	63
Total other liabilities	35	71
Derivatives, forwards and futures | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	0	0
Total other liabilities	0	0
Derivatives, forwards and futures | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	0	0
Total other liabilities	0	0
Derivatives, interest rate contracts | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	405	702
Total other liabilities	95	60
Derivatives, interest rate contracts | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	0	0
Total other liabilities	0	0
Derivatives, interest rate contracts | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	405	702
Total other liabilities	95	60
Derivatives, interest rate contracts | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	0	0
Total other liabilities	0	0
Derivatives, other | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	2	4
Total other liabilities	17	18
Derivatives, other | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	0	0
Total other liabilities	0	0
Derivatives, other | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	2	4
Total other liabilities	1	4
Derivatives, other | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	0	0
Total other liabilities	16	14
U.S. treasuries | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	603	613
U.S. treasuries | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	0	0
U.S. treasuries | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	603	613
U.S. treasuries | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	0	0
Government agency issued MBS | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	4,345	3,812
Government agency issued MBS | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	0	0
Government agency issued MBS | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	4,345	3,812
Government agency issued MBS | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	0	0
Government agency issued CMO | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	2,217	2,406
Government agency issued CMO | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	0	0
Government agency issued CMO | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	2,217	2,406
Government agency issued CMO | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	0	0
Other U.S. government agencies | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	788	684
Other U.S. government agencies | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	0	0
Other U.S. government agencies | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	788	684
Other U.S. government agencies | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	0	0
States and municipalities | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	525	460
States and municipalities | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	0	0
States and municipalities | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	525	460
States and municipalities | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	0	0
Corporate and other debt | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value		40
Corporate and other debt | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value		0
Corporate and other debt | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value		40
Corporate and other debt | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value		0
Interest- only strips- AFS | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	16	32
Interest- only strips- AFS | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	0	0
Interest- only strips- AFS | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	0	0
Interest- only strips- AFS | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Securities available for sale at fair value	16	32
Specialty Banking | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	1,319	1,176
Total trading liabilities - fixed income	315	353
Specialty Banking | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0	0
Total trading liabilities - fixed income	0	0
Specialty Banking | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	1,319	1,176
Total trading liabilities - fixed income	315	353
Specialty Banking | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0	0
Total trading liabilities - fixed income	0	0
Specialty Banking | U.S. treasuries | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	66	81
Total trading liabilities - fixed income	222	307
Specialty Banking | U.S. treasuries | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0	0
Total trading liabilities - fixed income	0	0
Specialty Banking | U.S. treasuries | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	66	81
Total trading liabilities - fixed income	222	307
Specialty Banking | U.S. treasuries | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0	0
Total trading liabilities - fixed income	0	0
Specialty Banking | Government agency issued MBS | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	276	633
Total trading liabilities - fixed income		3
Specialty Banking | Government agency issued MBS | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0	0
Total trading liabilities - fixed income		0
Specialty Banking | Government agency issued MBS | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	276	633
Total trading liabilities - fixed income		3
Specialty Banking | Government agency issued MBS | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0	0
Total trading liabilities - fixed income		0
Specialty Banking | Government agency issued CMO | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	238	212
Specialty Banking | Government agency issued CMO | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0	0
Specialty Banking | Government agency issued CMO | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	238	212
Specialty Banking | Government agency issued CMO | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0	0
Specialty Banking | Other U.S. government agencies | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	196	62
Specialty Banking | Other U.S. government agencies | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0	0
Specialty Banking | Other U.S. government agencies | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	196	62
Specialty Banking | Other U.S. government agencies | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0	0
Specialty Banking | States and municipalities | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	39	7
Total trading liabilities - fixed income	1
Specialty Banking | States and municipalities | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0	0
Total trading liabilities - fixed income	0
Specialty Banking | States and municipalities | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	39	7
Total trading liabilities - fixed income	1
Specialty Banking | States and municipalities | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0	0
Total trading liabilities - fixed income	0
Specialty Banking | Corporate and other debt | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	504	181
Total trading liabilities - fixed income	92	43
Specialty Banking | Corporate and other debt | Level 1 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0	0
Total trading liabilities - fixed income	0	0
Specialty Banking | Corporate and other debt | Level 2 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	504	181
Total trading liabilities - fixed income	92	43
Specialty Banking | Corporate and other debt | Level 3 | Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0	0
Total trading liabilities - fixed income	$ 0	$ 0

Fair Value of Assets and Liab_4

Fair Value of Assets and Liabilities - Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value (Details) - Level 3 - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ (18)	$ (19)	$ (14)	$ (23)
Acquired		0		0
Total net gains (losses) included in net income	0	0	(9)	(1)
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	2	2	7	7
Net transfers into (out of) Level 3	0	0	0	0
Ending balance	(16)	(17)	(16)	(17)
Net unrealized gains (losses) included in net income	0	0	(9)	(1)
Trading securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance		1		1
Acquired		0		0
Total net gains (losses) included in net income		0		0
Purchases		0		0
Sales		0		0
Settlements		0		0
Net transfers into (out of) Level 3		0		0
Ending balance		1		1
Net unrealized gains (losses) included in net income		0		0
Interest- only strips- AFS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	30	25	32	19
Acquired		0		0
Total net gains (losses) included in net income	1	(1)	5	(4)
Purchases	0	0	0	5
Sales	(35)	0	(68)	(8)
Settlements	0	0	0	0
Net transfers into (out of) Level 3	20	9	47	21
Ending balance	16	33	16	33
Net unrealized gains (losses) included in net income	0	1	0	3
Loans held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	25	13	12	14
Acquired		0		0
Total net gains (losses) included in net income	0	0	2	1
Purchases	3	0	8	0
Sales	(8)	0	(18)	0
Settlements	0	(1)	(2)	(3)
Net transfers into (out of) Level 3	4	0	22	0
Ending balance	24	12	24	12
Net unrealized gains (losses) included in net income	0	0	2	1
Loans held for investment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance		0	16	0
Acquired		13		13
Total net gains (losses) included in net income		0	0	0
Purchases		0	0	0
Sales		(3)	0	(3)
Settlements		(2)	(2)	(2)
Net transfers into (out of) Level 3		4	(14)	4
Ending balance	$ 0	12	0	12
Net unrealized gains (losses) included in net income		$ 0	$ 0	$ 0

Fair Value of Assets and Liab_5

Fair Value of Assets and Liabilities - Nonrecurring Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	$ 301	$ 405
Loans and leases	55,435	58,232
Non Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases	86	77
OREO	6	15
Other assets	10	9
Non Recurring | First Mortgages
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	1	1
Non Recurring | Small Business Administration And USDA
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	694	509
Non Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases	0	0
OREO	0	0
Other assets	0	0
Non Recurring | Level 1 | First Mortgages
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	0	0
Non Recurring | Level 1 | Small Business Administration And USDA
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	0	0
Non Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases	0	0
OREO	0	0
Other assets	0	0
Non Recurring | Level 2 | First Mortgages
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	0	0
Non Recurring | Level 2 | Small Business Administration And USDA
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	693	508
Non Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases	86	77
OREO	6	15
Other assets	10	9
Non Recurring | Level 3 | First Mortgages
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	1	1
Non Recurring | Level 3 | Small Business Administration And USDA
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	$ 1	$ 1

Fair Value of Assets and Liab_6

Fair Value of Assets and Liabilities - Gains/(losses) on Nonrecurring Fair Value Measurements (Details) - Non Recurring - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains/(losses), Loans, net of unearned income	$ (9)	$ (17)	$ (12)	$ (31)
Net gains/(losses), OREO	0	0	(1)	0
Net gains/(losses), Other assets	(2)	0	(2)	(1)
Gain (loss) on financial assets measured on non-recurring basis	(13)	(19)	(18)	(35)
SBAs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains/(losses), Loans held for sale	$ (2)	$ (2)	$ (3)	$ (3)

Fair Value of Assets and Liab_7

Fair Value of Assets and Liabilities - Narrative (Details) - Corporate - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Fixed asset impairments	$ 1	$ 5	$ 33	$ 6
Asset impairment charges			35
2019 Business Optimization | Disposition of Acquired Properties
Segment Reporting Information [Line Items]
Asset impairment charges	$ 1	$ 4	$ 3	$ 4

Fair Value of Assets and Liab_8

Fair Value of Assets and Liabilities - Schedule Of Unobservable Inputs Utilized In Determining The Fair Value Of Level 3 Recurring And Non-Recurring Measurements (Details) $ in Millions	Sep. 30, 2021USD ($)month	Dec. 31, 2020USD ($)month
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale at fair value	$ 8,494	$ 8,047
Loans held-for-sale	301	405
Derivative liability	130	125
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	16	14
Loans net of unearned income	86	77
OREO, fair value	6	15
Loans held for sale | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment		16
Other Assets | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets	$ 10	$ 9
Constant prepayment rate | Minimum | Discounted cash flow | Loans held for sale | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-investment, measurement input		0
Constant prepayment rate | Maximum | Discounted cash flow | Loans held for sale | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-investment, measurement input		0.26
Constant prepayment rate | Weighted Average | Discounted cash flow | Loans held for sale | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-investment, measurement input		0.11
Foreclosure losses | Minimum | Discounted cash flow | Loans Held For Sale, Residential Real Estate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.63
Foreclosure losses | Maximum | Discounted cash flow | Loans Held For Sale, Residential Real Estate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.65
Foreclosure losses | Weighted Average | Discounted cash flow | Loans Held For Sale, Residential Real Estate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.64
Constant default rate | Minimum | Discounted cash flow | Loans held for sale | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-investment, measurement input		0
Constant default rate | Maximum | Discounted cash flow | Loans held for sale | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-investment, measurement input		0.14
Constant default rate | Weighted Average | Discounted cash flow | Loans held for sale | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-investment, measurement input		0.01
Loss severity | Minimum | Discounted cash flow | Loans held for sale | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-investment, measurement input		0
Loss severity | Maximum | Discounted cash flow | Loans held for sale | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-investment, measurement input		1
Loss severity | Weighted Average | Discounted cash flow | Loans held for sale | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-investment, measurement input		0.11
Visa covered litigation resolution amount | Minimum | Discounted cash flow | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input, value	$ 5,400	$ 5,400
Visa covered litigation resolution amount | Maximum | Discounted cash flow | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input, value	6,000	6,000
Visa covered litigation resolution amount | Weighted Average | Discounted cash flow | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input, value	$ 5,800	$ 5,800
Probability of resolution scenarios | Minimum | Discounted cash flow | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input	0.10	10
Probability of resolution scenarios | Maximum | Discounted cash flow | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input	0.50	50
Probability of resolution scenarios | Weighted Average | Discounted cash flow | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input	0.16	0.16
Time until resolution | Minimum | Discounted cash flow | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input | month	6	3
Time until resolution | Maximum | Discounted cash flow | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input | month	30	27
Time until resolution | Weighted Average | Discounted cash flow | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input | month	21	19
Marketability adjustments for specific properties | Minimum | Appraisals from comparable properties | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans net of unearned income, measurement input	0	0
Marketability adjustments for specific properties | Minimum | Appraisals from comparable properties | Other Assets | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, measurement input	0	0
Marketability adjustments for specific properties | Maximum | Appraisals from comparable properties | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans net of unearned income, measurement input	0.10	10
Marketability adjustments for specific properties | Maximum | Appraisals from comparable properties | Other Assets | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, measurement input	0.25	25
Borrowing base certificates adjustment | Minimum | Other collateral valuations | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans net of unearned income, measurement input	0.20	20
Borrowing base certificates adjustment | Maximum | Other collateral valuations | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans net of unearned income, measurement input	0.50	50
Financial Statements/Auction values adjustment | Minimum | Other collateral valuations | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans net of unearned income, measurement input	0	0
Financial Statements/Auction values adjustment | Maximum | Other collateral valuations | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans net of unearned income, measurement input	0.25	25
Adjustment for value changes since appraisal | Minimum | Appraisals from comparable properties | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO measurement input	0	0
Adjustment for value changes since appraisal | Maximum | Appraisals from comparable properties | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO measurement input	0.10	10
Adjustments to current sales yields for specific properties | Minimum | Discounted cash flow | Other Assets | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, measurement input	0	0
Adjustments to current sales yields for specific properties | Maximum | Discounted cash flow | Other Assets | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, measurement input	0.15	15
Residential Real Estate | Loans Held For Sale, Residential Real Estate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	$ 25	$ 13
Residential Real Estate | Prepayment Speeds | Minimum | Discounted cash flow | Loans Held For Sale, Residential Real Estate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.04	5
Residential Real Estate | Prepayment Speeds | Maximum | Discounted cash flow | Loans Held For Sale, Residential Real Estate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.12	15
Residential Real Estate | Prepayment Speeds | Weighted Average | Discounted cash flow | Loans Held For Sale, Residential Real Estate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.05	0.05
Residential Real Estate | Foreclosure losses | Minimum | Discounted cash flow | Loans Held For Sale, Residential Real Estate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input		59
Residential Real Estate | Foreclosure losses | Maximum | Discounted cash flow | Loans Held For Sale, Residential Real Estate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input		70
Residential Real Estate | Foreclosure losses | Weighted Average | Discounted cash flow | Loans Held For Sale, Residential Real Estate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input		0.63
Residential Real Estate | Loss severity | Minimum | Discounted cash flow | Loans Held For Sale, Residential Real Estate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.01	3
Residential Real Estate | Loss severity | Maximum | Discounted cash flow | Loans Held For Sale, Residential Real Estate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.14	19
Residential Real Estate | Loss severity | Weighted Average | Discounted cash flow | Loans Held For Sale, Residential Real Estate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.08	0.12
Interest- only strips- AFS | Available-for-sale Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale at fair value	$ 16	$ 32
Interest- only strips- AFS | Constant prepayment rate | Discounted cash flow | Available-for-sale Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input		0.12
Interest- only strips- AFS | Constant prepayment rate | Minimum | Discounted cash flow | Available-for-sale Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.11
Interest- only strips- AFS | Constant prepayment rate | Maximum | Discounted cash flow | Available-for-sale Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.12
Interest- only strips- AFS | Constant prepayment rate | Weighted Average | Discounted cash flow | Available-for-sale Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.11	0.12
Interest- only strips- AFS | Bond equivalent yield | Discounted cash flow | Available-for-sale Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.10
Interest- only strips- AFS | Bond equivalent yield | Minimum | Discounted cash flow | Available-for-sale Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input		0.15
Interest- only strips- AFS | Bond equivalent yield | Maximum | Discounted cash flow | Available-for-sale Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input		0.17
Interest- only strips- AFS | Bond equivalent yield | Weighted Average | Discounted cash flow | Available-for-sale Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.10	0.15
SBAs | Loans Held For Sale - SBA | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	$ 1	$ 1
SBAs | Constant prepayment rate | Minimum | Discounted cash flow | Loans Held For Sale - SBA | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.08	8
SBAs | Constant prepayment rate | Maximum | Discounted cash flow | Loans Held For Sale - SBA | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.12	12
SBAs | Constant prepayment rate | Weighted Average | Discounted cash flow | Loans Held For Sale - SBA | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.10	0.10
SBAs | Bond equivalent yield | Discounted cash flow | Loans Held For Sale - SBA | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.08
SBAs | Bond equivalent yield | Minimum | Discounted cash flow | Loans Held For Sale - SBA | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input		7
SBAs | Bond equivalent yield | Maximum | Discounted cash flow | Loans Held For Sale - SBA | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input		8
SBAs | Bond equivalent yield | Weighted Average | Discounted cash flow | Loans Held For Sale - SBA | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.08	0.07

Fair Value of Assets and Liab_9

Fair Value of Assets and Liabilities - Summary Of Differences Between The Fair Value Carrying Amount Of Mortgages Held-For-Sale And Aggregate Unpaid Principal Amount (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held-for-sale	$ 301	$ 405
Loans held for investment	0	16
Fair value carrying amount less aggregate unpaid principal - Total loans		(1)
Nonaccrual loans		1
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans		0
Held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held-for-sale	301	405
Fair value carrying amount less aggregate unpaid principal - Total loans	(4)	(37)
Nonaccrual loans	4	2
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans	(3)	(3)
Loans 90 days or more past due and still accruing	1
Fair value carrying amount less aggregate unpaid principal - Loans 90 days or more past due and still accruing	0
Aggregate unpaid principal
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held for investment		17
Nonaccrual loans		1
Aggregate unpaid principal | Held for sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held-for-sale	305	442
Nonaccrual loans	7	$ 5
Loans 90 days or more past due and still accruing	$ 1

Fair Value of Assets and Lia_10

Fair Value of Assets and Liabilities - Changes In Fair Value Of Assets And Liabilities Which Fair Value Option Included In Current Period Earnings (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Mortgage Banking Noninterest Income | Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value included in net income	$ (3)	$ 2	$ (8)	$ 3

Fair Value of Assets and Lia_11

Fair Value of Assets and Liabilities - Summary Of Book Value And Estimated Fair Value Of Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	$ 54,701	$ 57,269
Short-term financial assets:
Interest-bearing deposits with banks	14,829	8,351
Securities purchased under agreements to resell	355	380
Trading securities	1,319	1,176
Loans held for sale	1,052	1,022
Securities available for sale at fair value	8,494	8,047
Securities held to maturity (fair value of $303 and $10, respectively)	304	10
Derivative assets	451	765
Other assets:
Total assets	88,537	84,209
Liabilities:
Trading liabilities	315	353
Short-term financial liabilities:
Securities sold under agreements to repurchase	1,299	1,187
Term borrowings:
Other long term borrowings	1,584	1,670
Derivative liabilities	130	125
Total liabilities	80,005	75,902
Fair Value, Inputs, Level 3 | FHLB-Cincinnati Stock
Term borrowings:
Restricted investments	29	61
Fair Value, Inputs, Level 3 | FRB Stock
Term borrowings:
Restricted investments	203	202
Reported Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	54,701	57,269
Short-term financial assets:
Interest-bearing deposits with banks	14,829	8,351
Federal funds sold and securities purchased under agreements to resell	6	65
Securities purchased under agreements to resell	355	380
Total short-term financial assets	15,190	8,796
Trading securities	1,319	1,176
Loans held for sale	1,050	1,022
Securities available for sale at fair value	8,494	8,047
Securities held to maturity (fair value of $303 and $10, respectively)	304	10
Derivative assets	453	769
Other assets:
Tax credit investments	409	400
Deferred compensation assets	127	118
Equity, mutual funds, and other	260	288
Total other assets	796	806
Total assets	82,307	77,895
Liabilities:
Defined maturity	3,920	5,070
Trading liabilities	315	353
Short-term financial liabilities:
Federal funds purchased	814	845
Securities sold under agreements to repurchase	1,299	1,187
Other short-term borrowings	111	166
Short Term Financial Liabilities	2,224	2,198
Term borrowings:
Real estate investment trust-preferred	47	46
Term borrowings—new market tax credit investment	45	45
Secured borrowings	4	15
Junior subordinated debentures	160	238
Other long term borrowings	1,328	1,326
Total term borrowings	1,584	1,670
Derivative liabilities	147	149
Total liabilities	8,190	9,440
Reported Value Measurement | Commercial, financial and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	31,142	32,651
Reported Value Measurement | Commercial Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	12,032	12,033
Reported Value Measurement | Consumer Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	10,608	11,483
Reported Value Measurement | Credit Card and Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	919	1,102
Reported Value Measurement | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held for sale	301	405
Reported Value Measurement | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held for sale	693	509
Reported Value Measurement | Other consumer loans- LOCOM
Short-term financial assets:
Loans held for sale	4	31
Reported Value Measurement | Mortgage loans - LOCOM
Short-term financial assets:
Loans held for sale	52	77
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	55,095	57,695
Short-term financial assets:
Interest-bearing deposits with banks	14,829	8,351
Federal funds sold and securities purchased under agreements to resell	6	65
Securities purchased under agreements to resell	355	380
Total short-term financial assets	15,190	8,796
Trading securities	1,319	1,176
Loans held for sale	1,054	1,025
Securities available for sale at fair value	8,494	8,047
Securities held to maturity (fair value of $303 and $10, respectively)	303	10
Derivative assets	453	769
Other assets:
Tax credit investments	395	371
Deferred compensation assets	127	118
Equity, mutual funds, and other	260	288
Total other assets	782	777
Total assets	82,690	78,295
Liabilities:
Defined maturity	3,926	5,083
Trading liabilities	315	353
Short-term financial liabilities:
Federal funds purchased	814	845
Securities sold under agreements to repurchase	1,299	1,187
Other short-term borrowings	111	166
Short Term Financial Liabilities	2,224	2,198
Term borrowings:
Real estate investment trust-preferred	47	47
Term borrowings—new market tax credit investment	44	45
Secured borrowings	4	15
Junior subordinated debentures	184	223
Other long term borrowings	1,464	1,455
Total term borrowings	1,743	1,785
Derivative liabilities	147	149
Total liabilities	8,355	9,568
Unfunded Commitments:
Loan commitments	1	2
Standby and other commitments	8	6
Estimate of Fair Value Measurement | Commercial, financial and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	30,972	32,582
Estimate of Fair Value Measurement | Commercial Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	12,027	12,079
Estimate of Fair Value Measurement | Consumer Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	11,151	11,903
Estimate of Fair Value Measurement | Credit Card and Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	945	1,131
Estimate of Fair Value Measurement | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held for sale	301	405
Estimate of Fair Value Measurement | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held for sale	697	512
Estimate of Fair Value Measurement | Other consumer loans- LOCOM
Short-term financial assets:
Loans held for sale	4	31
Estimate of Fair Value Measurement | Mortgage loans - LOCOM
Short-term financial assets:
Loans held for sale	52	77
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	0	0
Short-term financial assets:
Interest-bearing deposits with banks	14,829	8,351
Federal funds sold and securities purchased under agreements to resell	0	0
Securities purchased under agreements to resell	0	0
Total short-term financial assets	14,829	8,351
Trading securities	0	0
Loans held for sale	0	0
Securities available for sale at fair value	0	0
Securities held to maturity (fair value of $303 and $10, respectively)	0	0
Derivative assets	46	63
Other assets:
Tax credit investments	0	0
Deferred compensation assets	127	118
Equity, mutual funds, and other	28	25
Total other assets	155	143
Total assets	15,030	8,557
Liabilities:
Defined maturity	0	0
Trading liabilities	0	0
Short-term financial liabilities:
Federal funds purchased	0	0
Securities sold under agreements to repurchase	0	0
Other short-term borrowings	0	0
Short Term Financial Liabilities	0	0
Term borrowings:
Real estate investment trust-preferred	0	0
Term borrowings—new market tax credit investment	0	0
Secured borrowings	0	0
Junior subordinated debentures	0	0
Other long term borrowings	0	0
Total term borrowings	0	0
Derivative liabilities	35	71
Total liabilities	35	71
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Commercial, financial and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Commercial Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Consumer Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Credit Card and Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held for sale	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held for sale	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Other consumer loans- LOCOM
Short-term financial assets:
Loans held for sale	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Mortgage loans - LOCOM
Short-term financial assets:
Loans held for sale	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	0	0
Short-term financial assets:
Interest-bearing deposits with banks	0	0
Federal funds sold and securities purchased under agreements to resell	6	65
Securities purchased under agreements to resell	355	380
Total short-term financial assets	361	445
Trading securities	1,319	1,176
Loans held for sale	977	935
Securities available for sale at fair value	8,478	8,015
Securities held to maturity (fair value of $303 and $10, respectively)	303	0
Derivative assets	407	706
Other assets:
Tax credit investments	0	0
Deferred compensation assets	0	0
Equity, mutual funds, and other	0	0
Total other assets	0	0
Total assets	11,845	11,277
Liabilities:
Defined maturity	3,926	5,083
Trading liabilities	315	353
Short-term financial liabilities:
Federal funds purchased	814	845
Securities sold under agreements to repurchase	1,299	1,187
Other short-term borrowings	111	166
Short Term Financial Liabilities	2,224	2,198
Term borrowings:
Real estate investment trust-preferred	0	0
Term borrowings—new market tax credit investment	0	0
Secured borrowings	0	0
Junior subordinated debentures	0	0
Other long term borrowings	1,464	1,455
Total term borrowings	1,464	1,455
Derivative liabilities	96	64
Total liabilities	8,025	9,153
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Commercial, financial and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Commercial Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Consumer Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Credit Card and Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held for sale	277	393
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held for sale	696	511
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Other consumer loans- LOCOM
Short-term financial assets:
Loans held for sale	4	31
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Mortgage loans - LOCOM
Short-term financial assets:
Loans held for sale	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	55,095	57,695
Short-term financial assets:
Interest-bearing deposits with banks	0	0
Federal funds sold and securities purchased under agreements to resell	0	0
Securities purchased under agreements to resell	0	0
Total short-term financial assets	0	0
Trading securities	0	0
Loans held for sale	77	90
Securities available for sale at fair value	16	32
Securities held to maturity (fair value of $303 and $10, respectively)	0	10
Derivative assets	0	0
Other assets:
Tax credit investments	395	371
Deferred compensation assets	0	0
Equity, mutual funds, and other	232	263
Total other assets	627	634
Total assets	55,815	58,461
Liabilities:
Defined maturity	0	0
Trading liabilities	0	0
Short-term financial liabilities:
Federal funds purchased	0	0
Securities sold under agreements to repurchase	0	0
Other short-term borrowings	0	0
Short Term Financial Liabilities	0	0
Term borrowings:
Real estate investment trust-preferred	47	47
Term borrowings—new market tax credit investment	44	45
Secured borrowings	4	15
Junior subordinated debentures	184	223
Other long term borrowings	0	0
Total term borrowings	279	330
Derivative liabilities	16	14
Total liabilities	295	344
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Commercial, financial and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	30,972	32,582
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Commercial Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	12,027	12,079
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Consumer Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	11,151	11,903
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Credit Card and Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net loans and leases	945	1,131
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held for sale	24	12
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held for sale	1	1
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Other consumer loans- LOCOM
Short-term financial assets:
Loans held for sale	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Mortgage loans - LOCOM
Short-term financial assets:
Loans held for sale	52	77
Contractual Amount
Unfunded Commitments:
Loan commitments	23,279	20,796
Standby and other commitments	$ 749	$ 751

Uncategorized Items - fhn-20210

Label	Element	Value
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-13 [Member]