Zions Bancorporation, National Association (ZION) 10-Q 6 Aug 19 2019 Q2 Quarterly report Financial data

Cover

Cover - shares	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Document Information [Line Items]
Entity Address, City or Town	Salt Lake City,
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Entity Registrant Name	ZIONS BANCORPORATION, NATIONAL ASSOCIATION
Entity Central Index Key	0000109380
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		176,962,996
Entity Emerging Growth Company	false
Entity Small Business	false
Entity File Number	001-12307
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Tax Identification Number	87-0189025
City Area Code	801
Local Phone Number	844-7637
Entity Address, Address Line One	One South Main
Entity Address, State or Province	UT
Entity Address, Postal Zip Code	84133-1109
Document Quarterly Report	true
Document Transition Report	false
Entity Incorporation, State or Country Code	X1
Entity Interactive Data Current	Yes
Common Stock [Member] | NASDAQ - ALL MARKETS [Member]
Document Information [Line Items]
Trading Symbol	ZION
Title of 12(b) Security	Common Stock, par value $0.001
Security Exchange Name	NASDAQ
Warrant [Member] | NASDAQ - ALL MARKETS [Member]
Document Information [Line Items]
Trading Symbol	ZIONW
Title of 12(b) Security	Warrants to Purchase Common Stock (expiring May 22, 2020)
Security Exchange Name	NASDAQ
Series A Floating-Rate Non-Cumulative Perpetual Preferred Stock [Member] | NEW YORK STOCK EXCHANGE, INC. [Member]
Document Information [Line Items]
Trading Symbol	ZB/A
Title of 12(b) Security	Series A Floating-Rate Non-Cumulative Perpetual Preferred Stock
Security Exchange Name	NYSE
Series G Fixed/Floating-Rate Non-Cumulative Perpetual Preferred Stock [Member] | NEW YORK STOCK EXCHANGE, INC. [Member]
Document Information [Line Items]
Trading Symbol	ZB/G
Title of 12(b) Security	Series G Fixed/Floating-Rate Non-Cumulative Perpetual Preferred Stock
Security Exchange Name	NYSE
Series H 5.75% Non-Cumulative Perpetual Preferred Stock [Member] | NEW YORK STOCK EXCHANGE, INC. [Member]
Document Information [Line Items]
Trading Symbol	ZB/H
Title of 12(b) Security	Series H 5.75% Non-Cumulative Perpetual Preferred Stock
Security Exchange Name	NYSE
Fixed-to-Floating Rate Subordinated Notes [Member] | NEW YORK STOCK EXCHANGE, INC. [Member]
Document Information [Line Items]
Trading Symbol	ZBK
Title of 12(b) Security	6.95% Fixed-to-Floating Rate Subordinated Notes due September 15, 2028
Security Exchange Name	NYSE

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) shares in Thousands, $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Held-to-maturity, fair value	$ 698
ASSETS
Cash and due from banks	538	$ 614
Money market investments:
Interest-bearing deposits	634	619
Federal funds sold and security resell agreements	620	1,461
Investment securities:
Available-for-sale, at fair value	14,672	14,737
Trading account, at fair value	148	106
Total investment securities	15,515	15,617
Loans held for sale	105	93
Loans held for investment, net of allowance
Loans and leases, net of unearned income and fees	48,617	46,714
Less allowance for loan losses	503	495
Loans held for investment, net of allowance	48,114	46,219
Other noninterest-bearing investments	1,056	1,046
Premises, equipment and software, net	1,133	1,124
Goodwill and intangibles	1,014	1,015
Other real estate owned	5	4
Other assets	1,331	934
Total assets	70,065	68,746
Liabilities and Equity [Abstract]
Noninterest-bearing demand	22,947	23,645
Interest-bearing:
Savings and money market	26,470	26,120
Total deposits	54,332	54,101
Federal funds purchased and other short-term borrowings	6,023	5,653
Long-term Debt	1,236	724
Reserve for unfunded lending commitments	60	57
Other liabilities	815	633
Liabilities	62,466	61,168
Shareholders' equity:
Preferred stock, without par value	566	566
Additional Paid-in Capital	3,271	3,806
Retained earnings	3,737	3,456
Accumulated other comprehensive income (loss)	25	(250)
Stockholders' Equity	7,599	7,578
Total liabilities and shareholders' equity	$ 70,065	$ 68,746
Preferred Stock, Shares Authorized	4,400	4,400
Common Stock, Shares Authorized	350,000	350,000
Common Stock, Shares, Issued	176,935	187,554
Common stock, outstanding shares	176,935	187,554
Fair Value, Inputs, Level 2 [Member]
Investment securities:
Held-to-maturity, at amortized cost	$ 695	$ 774
Trading account, at fair value	130	92
Interest-bearing:
Time	4,915	4,336
Long-term Debt	1,236	724
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Held-to-maturity, fair value	698	767
Interest-bearing:
Time	4,923	4,319
Long-term Debt	$ 1,248	$ 727

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Preferred Stock, Shares Authorized	4,400	4,400
Common Stock, Shares Authorized	350,000	350,000
Common Stock, Par or Stated Value Per Share	$ 0.001
Common Stock, Shares, Issued	176,935	187,554
Held-to-maturity, fair value	$ 698
Common stock, outstanding shares	176,935	187,554
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Held-to-maturity, fair value	$ 698	$ 767

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest Income (Expense), Net [Abstract]
Interest and Fees and Loans	$ 581	$ 514	$ 1,151	$ 1,011
Interest on Money Market Investments	8	7	17	13
Interest on Securities	95	85	191	170
Total Interest Income	684	606	1,359	1,194
Interest Expense [Abstract]
Interest on Deposits	66	29	123	48
Interest on short- and long-term borrowings	49	29	91	56
Total Interest Expense	115	58	214	104
Net interest income	569	548	1,145	1,090
Provision for loan losses	20	5	22	(35)
Provision for unfunded lending commitments	1	7	3	0
Provision for Credit Losses	21	12	25	(35)
Net interest income after provision for loan losses	548	536	1,120	1,125
Noninterest income:
Capital Markets and Foreign Exchange Gain (Loss)	9	7	16	15
Other service charges, commissions, and fees	58	55	113	110
Wealth management and trust income	13	14	26	25
Loan Sales and Servicing Income	9	7	14	13
Customer-related Fees	130	125	250	247
Dividends and Other Investment Income	9	11	18	22
Securities Gains, Net	(3)	1	(2)	1
Noninterest Income, Other Operating Income	(4)	1	(2)	6
Noninterest Income	132	138	264	276
Noninterest expense:
Salaries and Employee Benefits	274	266	562	535
Occupancy, Net	32	32	65	63
Furniture, Equipment, and Software, Net	35	32	67	65
Other real estate expense, net	0	0	1	(1)
Credit-Related Expense	8	7	13	13
Professional and Legal Fees	13	14	23	26
Advertising	5	7	11	13
FDIC Premiums	6	14	12	26
Other	51	49	102	98
Total Noninterest Expense	424	421	854	840
Income Before Income Taxes	256	253	530	561
Income taxes	58	56	119	126
Net income	198	197	411	435
Preferred Stock Dividends	(9)	(10)	(17)	(17)
Net Earnings Available to Common Shareholders	$ 189	$ 187	$ 394	$ 418
Weighted average common shares outstanding during the period:
Weighted Average Number of Shares Outstanding, Basic	179,156	195,583	181,946	196,149
Weighted Average Number of Shares Outstanding, Diluted	189,098	209,247	192,206	209,859
Earnings Per Share, Basic	$ 1.05	$ 0.95	$ 2.15	$ 2.11
Earnings Per Share, Diluted	$ 0.99	$ 0.89	$ 2.04	$ 1.97

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net income for the period	$ 198	$ 197	$ 411	$ 435
Other comprehensive income (loss), net of tax:
Unrealized holding gains (losses) on investment securities	116	(50)	237	(175)
Net unrealized gains (losses) on other noninterest-bearing investments	0	2	(3)	3
Net unrealized holding gains (losses) on derivative instruments	31	(2)	39	(5)
Reclassification adjustment for decrease in interest income recognized in earnings on derivatives instruments	1	1	2	1
Other comprehensive income (loss)	148	(49)	275	(176)
Comprehensive income	$ 346	$ 148	$ 686	$ 259

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Statement of Cash Flows [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 411	$ 435
Provision for Loan, Lease, and Other Losses	25	(35)
Depreciation, Depletion and Amortization, Nonproduction	93	92
Share-based Payment Arrangement, Noncash Expense	18	18
Deferred Income Tax Expense (Benefit)	3	2
Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI	42	59
Increase (Decrease) in Loans Held-for-sale	39	34
Increase (Decrease) in Operating Liabilities	(73)	85
Increase (Decrease) in Other Operating Assets	166	52
Other Noncash Income (Expense)	10	14
Net cash provided by (used in) operating activities	220	438
Payments for (Proceeds from) Short-term Investments	(827)	(40)
Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities	239	114
Payments to Acquire Held-to-maturity Securities	160	222
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale	1,345	1,404
Payments to Acquire Available-for-sale Securities	1,028	1,176
Payments for (Proceeds from) Other Loans and Leases	1,877	431
Net change in other noninterest-bearing investments	(5)	(4)
Payments to Acquire Property, Plant, and Equipment	60	54
Payments for (Proceeds from) Other Investing Activities	(4)	0
Net Cash Provided by (Used in) Investing Activities, Total	(715)	(329)
Increase (Decrease) in Deposits	232	965
Proceeds from (Repayments of) Short-term Debt	371	1,181
Repayments of debt over 90 days and up to one year	0	2,000
Proceeds from (Repayments of) Debt	497	0
Proceeds from Issuance of Common Stock	7	17
Payments for Repurchase of Common Stock	551	248
Payments of Dividends	127	104
Proceeds from (Payments for) Other Financing Activities	(10)	0
Net Cash Provided by (Used in) Financing Activities, Total	419	(189)
Net increase (decrease) in cash and due from banks	(76)	(80)
Cash and Due from Banks	538	468
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	199	100
Income Taxes Paid, Net	132	91
Real Estate Owned, Transfer to Real Estate Owned	6	6
Transfer of Portfolio Loans and Leases to Held-for-sale	$ 0	$ 39

Statement

Statement - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Stockholders' Equity	$ 7,599		$ 7,599			$ 7,578
Common stock, outstanding shares	176,935		176,935			187,554
Additional Paid-in Capital	$ 3,271		$ 3,271			$ 3,806
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	198	$ 197	411	$ 435
Other comprehensive income (loss)	$ 148	$ (49)	$ 275	$ (176)
Stock Repurchased During Period, Shares	5,800	4,300	11,300
Common Stock, Dividends, Per Share, Declared			$ 0.60	$ 0.44
Preferred Stock [Member]
Stockholders' Equity	$ 566	$ 566	$ 566	$ 566	$ 566	566	$ 566	$ 566
Common Stock [Member]
Stockholders' Equity	$ 0	$ 4,231	$ 0	$ 4,231	$ 0	$ 0	$ 4,346	$ 4,445
Common stock, outstanding shares	176,935	195,392	176,935	195,392	182,513	187,554	197,050	197,532
Stock Repurchased During Period, Shares	5,857	2,270	11,363	4,541
Stock Repurchased During Period, Value		$ (127)		$ (248)
Net Shares Issued From Stock Warrant Exercises	7	53	8	1,095
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	272	559	736	1,306
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		$ 12		$ 34
Additional Paid-in Capital [Member]
Additional Paid-in Capital	$ 3,271	0	$ 3,271	0	$ 3,541	$ 3,806	$ 0	$ 0
Stock Repurchased During Period, Value	(276)		(551)
Employee Plans, Accumulated Paid-in Capital	6		16
Retained Earnings [Member]
Cumulative Effect of ASU 2017-08			(3)
Stockholders' Equity	3,737	3,139	3,737	3,139	3,603	3,456	2,999	2,807
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	198	197	411	435
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				1
Dividends, Preferred Stock	10	10	17	17
Dividends, Common Stock	(54)	(47)	(110)	(87)
Accumulated Other Comprehensive Income (Loss) [Member]
Stockholders' Equity	25	(315)	25	(315)	122	(250)	267	(139)
Other comprehensive income (loss)	147	(48)	275	(176)
Parent [Member]
Cumulative Effect of ASU 2017-08			(3)
Stockholders' Equity	7,599	7,621	7,599	7,621	$ 7,588	$ 7,578	$ 7,644	$ 7,679
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	198	197	411	435
Other comprehensive income (loss)	147	(48)	275	(176)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				1
Stock Repurchased During Period, Value	(276)	(127)	(551)	(248)
Employee Plans, Accumulated Paid-in Capital	6	12	16
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures				34
Dividends, Preferred Stock	10	10	17	17
Dividends, Common Stock	$ (54)	$ (47)	$ (110)	$ (87)

Basis of Presentation (Notes)

Basis of Presentation (Notes)	6 Months Ended
	Jun. 30, 2019
Basis Of Presentation [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	BASIS OF PRESENTATION The accompanying unaudited consolidated financial statements of Zions Bancorporation, National Association and its majority-owned subsidiaries (collectively “Zions Bancorporation, N.A.,” “the Bank,” “we,” “our,” “us”) have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“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 of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. References to GAAP, including standards promulgated by the Financial Accounting Standards Board (“FASB”), are made according to sections of the Accounting Standards Codification (“ASC”). Changes to the ASC are made with Accounting Standards Updates (“ASU”) that include consensus issues of the Emerging Issues Task Force. Operating results for the six months ended June 30, 2019 and 2018 are not necessarily indicative of the results that may be expected in future periods. In preparing the consolidated financial statements, we are required to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. The consolidated balance sheet at December 31, 2018 is from the audited financial statements at that date, but does not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in the Bank’s 2018 Annual Report on Form 10-K. Certain prior period amounts have been reclassified to conform with the current period presentation. These reclassifications did not affect net income or shareholders’ equity.

Certain Recent Accounting Prono

Certain Recent Accounting Pronouncements (Notes)	6 Months Ended
	Jun. 30, 2019
Certain Recent Accounting Pronouncements [Abstract]
Certain Recent Accounting Pronouncements [Text Block]	RECENT ACCOUNTING PRONOUNCEMENTS AND DEVELOPMENTS Standard Description Date of adoption Effect on the financial statements or other significant matters Standards not yet adopted by the Bank ASU 2016-13, Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments and subsequent related ASUs This ASU, and subsequent updates, significantly changes how entities will measure credit losses for virtually all financial assets and certain other instruments that are not measured at fair value through net income that have the contractual right to receive cash. The standard replaces today’s “incurred loss” approach with an “expected loss” model for instruments such as loans and held-to-maturity (“HTM”) securities that are measured at amortized cost. The standard requires credit losses relating to available-for sale (“AFS”) debt securities to be recorded through an allowance for credit loss (“ACL”) rather than a reduction of the carrying amount and replaces the historically required other-than-temporary impairment (“OTTI”) analysis. It also changes the accounting for purchased credit-impaired debt securities and loans. January 1, Our implementation team, led jointly by our internal Credit, Treasury, and Accounting groups, has developed models to meet the new standard. We continue to analyze the results of our models. Next steps include establishing and testing controls, further challenging model results, finalizing the qualitative allowance process, and developing disclosures. Based on our current analysis, we believe the standard may potentially have a material impact on the Bank’s financial statements, and we expect more volatility in the credit loss estimate over economic cycles. The Bank will adopt this guidance beginning January 1, 2020. Transition to the new standard is through a cumulative-effect adjustment to the opening retained earnings as of the beginning of January 1, 2020. ASU 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment This ASU removes the requirements in step two of the current goodwill impairment model, eliminating the requirement to calculate and compare the implied fair value of the reporting entity with the carrying amount of that entity, including goodwill, to measure any impairment charge. Instead, entities will record an impairment charge based on the excess of a reporting unit’s carrying amount of goodwill over its implied fair value of goodwill (i.e., measure the charge based on step one of the current guidance). January 1, We do not currently expect this guidance will have a material impact on the Bank’s financial statements since the fair values of our reporting units were not lower than their respective carrying amounts of goodwill at the time of our impairment analysis for 2018 and there were no significant decreases in the fair value identified for the relevant reporting units since the analysis was performed. Standard Description Date of adoption Effect on the financial statements or other significant matters Standards adopted by the Bank during 2019 ASU 2016-02, Leases (Topic 842) and subsequent related ASUs Although lessor accounting was left materially unchanged by ASU 2016-02 (and all related ASUs which together have been codified in ASC 842), ASC 842 requires that all lessees recognize a right-of-use ("ROU") asset and an offsetting lease liability for all leases with a term greater than 12 months. As the lessee, we adopted an accounting policy election, by class of underlying asset, to not recognize lease assets or liabilities for leases with a term of 12 months or less. January 1, The Bank adopted ASC 842 as of January 1, 2019 using the second of two permitted modified retrospective approaches for initial adoption. Under this method, the Bank recorded a right-of use asset of approximately $225 million and a lease liability of approximately $242 million. There was no impact to retained earnings upon adoption. ASU 2017-08, Nonrefundable Fees and Other Costs (Subtopic 310-20). Premium Amortization on Purchased Callable Debt Securities The amendments in this ASU shorten the amortization period for certain callable debt securities held at a premium. The standard requires the premium of qualifying debt securities to be amortized to the earliest call date. The update does not change the accounting for callable debt securities held at a discount. January 1, We adopted this standard as of January 1, 2019 using a modified retrospective transition approach. As a result of adoption, we recorded a $3 million decrease to retained earnings on January 1, 2019, as a cumulative effect adjustment. ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement The purpose of this ASU is to improve the effectiveness of disclosures in the notes to the financial statements. This update removes, modifies, and makes certain additions to the disclosure requirements for fair value measurement. January 1, We early adopted this ASU as of January 1, 2019. This standard ASU 2018-15, Intangibles – Goodwill and Other-Internal- Use Software (Topic 350-40): Customer’s Accounting for Implementation Cost Incurred in a Cloud Computing Arrangement That Is a Service Contract This ASU aligns the requirements for capitalizing implementation costs associated with Cloud Computing Arrangements that meet the definition of a service contract with requirements already provided for costs associated with internal-use software. Additionally, it clarifies that: January 1, We early adopted this ASU as of January 1, 2019. The Bank has historically been applying the guidance as clarified in this ASU. Consequently, the adoption of the ASU did not have a material impact on the Bank’s financial statements.

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value	FAIR VALUE Fair Value Measurement Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. For a discussion of the Bank’s valuation methodologies for assets and liabilities measured at fair value and the fair value hierarchy, see Note 3 of our 2018 Annual Report on Form 10-K. Quantitative Disclosure by Fair Value Hierarchy Assets and liabilities measured at fair value by class on a recurring basis are summarized as follows: (In millions) June 30, 2019 Level 1 Level 2 Level 3 Total ASSETS Investment securities: Available-for-sale: 1 U.S. Treasury, agencies and corporations $ 40 $ 13,257 $ — $ 13,297 Municipal securities 1,350 1,350 Other debt securities 25 25 Total Available-for-sale 40 14,632 — 14,672 Trading account 18 130 148 Other noninterest-bearing investments: Bank-owned life insurance 522 522 Private equity investments 105 105 Other assets: Agriculture loan servicing and interest-only strips 19 19 Deferred compensation plan assets 106 106 Derivatives: Derivatives designated as hedges 26 26 Derivatives not designated as hedges: Customer-facing interest rate 139 139 Other interest rate 2 2 Foreign exchange 3 3 Total Assets $ 167 $ 15,451 $ 124 $ 15,742 LIABILITIES Securities sold, not yet purchased $ 66 $ — $ — $ 66 Other liabilities: Deferred compensation plan obligations 106 106 Derivatives: Derivatives not designated as hedges: Customer-facing interest rate 11 11 Other interest rate 1 1 Foreign exchange 2 2 Total Liabilities $ 174 $ 12 $ — $ 186 1 We used a third-party pricing service to measure fair value for approximately 94% of our AFS Level 2 securities. (In millions) December 31, 2018 Level 1 Level 2 Level 3 Total ASSETS Investment securities: Available-for-sale: 1 U.S. Treasury, agencies and corporations $ 40 $ 13,385 $ — $ 13,425 Municipal securities 1,291 1,291 Other debt securities 21 21 Total Available-for-sale 40 14,697 — 14,737 Trading account 14 92 106 Other noninterest-bearing investments: Bank-owned life insurance 516 516 Private equity investments 102 102 Other assets: Agriculture loan servicing and interest-only strips 18 18 Deferred compensation plan assets 95 95 Derivatives: Derivatives not designated as hedges: Customer-facing interest rate 40 40 Other interest rate 1 1 Foreign exchange 4 4 Total Assets $ 153 $ 15,346 $ 120 $ 15,619 LIABILITIES Securities sold, not yet purchased $ 85 $ — $ — $ 85 Other liabilities: Deferred compensation plan obligations 95 95 Derivatives: Derivatives not designated as hedges: Customer-facing interest rate 36 36 Other interest rate 1 1 Foreign exchange 2 2 Total Liabilities $ 182 $ 37 $ — $ 219 1 We used a third-party pricing service to measure fair value for approximately 95% of our AFS Level 2 securities. Level 3 Valuations The Bank’s Level 3 holdings include private equity investments (“PEIs”), agriculture loan servicing, and interest-only strips. For additional information regarding the financial instruments measured under Level 3, and the methods and significant assumptions used to estimate their fair value, see Note 3 of our 2018 Annual Report on Form 10-K. Reconciliation of Level 3 Fair Value Measurements The following reconciles the beginning and ending balances of assets and liabilities that are measured at fair value by class on a recurring basis using Level 3 inputs: Level 3 Instruments Three Months Ended Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 (In millions) Private Ag loan svcg and int-only strips Private Ag loan svcg and int-only strips Private equity investments Ag loan svcg and int-only strips Private equity investments Ag loan svcg and int-only strips Balance at beginning of period $ 107 $ 17 $ 100 $ 18 $ 102 $ 18 $ 95 $ 18 Securities gains (losses), net (2) — 1 — (1) — 1 — Other noninterest income — 2 — — — 1 — — Purchases — — 1 — 4 — 6 — Balance at end of period $ 105 $ 19 $ 102 $ 18 $ 105 $ 19 $ 102 $ 18 The reconciliation of Level 3 instruments does not include any realized gains and losses in the statement of income during the three months ended June 30, 2019 and 2018. During the six months ended June 30, there were no realized gains or losses in the statement of income in 2019 and $3 million in realized losses in 2018. Nonrecurring Fair Value Measurements Included in the balance sheet amounts are the following amounts of assets that had fair value changes measured on a nonrecurring basis. (In millions) Fair value at June 30, 2019 Fair value at December 31, 2018 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total ASSETS Private equity investments $ — $ — $ — $ — $ — $ — $ 1 $ 1 Impaired loans — 6 — 6 — 32 — 32 Other real estate owned — 1 — 1 — — — — Total $ — $ 7 $ — $ 7 $ — $ 32 $ 1 $ 33 The previous fair values may not be current as of the dates indicated, but rather as of the date the fair value change occurred, such as a charge for impairment. Accordingly, carrying values may not equal current fair value. Gains (losses) from fair value changes (In millions) Three Months Ended Six Months Ended 2019 2018 2019 2018 ASSETS Private equity investments $ — $ — $ — $ — Impaired loans (9) (1) (9) (5) Other real estate owned — — — (1) Total $ (9) $ (1) $ (9) $ (6) During the three months ended June 30, we recognized an insignificant amount of net gains in 2019 and 2018 from the sale of other real estate owned (“OREO”) properties. During the six months ended June 30, we recognized approximately $1 million of net gains in 2019 and 2018 from the sale of OREO properties that had a carrying value, at the time of sale, of approximately $2 million during these same periods. Prior to their sale, we recognized an insignificant amount of impairment on these properties during the six months ended June 30, 2019 and 2018. Private equity investments carried at cost were measured at fair value for impairment purposes according to the methodology previously discussed for these investments. Amounts of PEIs carried at cost were $9 million at June 30, 2019 and $10 million at December 31, 2018. Amounts of other noninterest-bearing investments carried at cost were $332 million at June 30, 2019 and $329 million at December 31, 2018, which were comprised of Federal Reserve and Federal Home Loan Bank (“FHLB”) stock. Private equity investments accounted for using the equity method were $38 million at June 30, 2019 and $35 million at December 31, 2018. Impaired (or nonperforming) loans that are collateral-dependent were measured at fair value based on the fair value of the collateral. OREO was measured initially at fair value based on collateral appraisals at the time of transfer and subsequently at the lower of cost or fair value. For additional information regarding the measurement of fair value for impaired loans, collateral-dependent loans, and OREO, see Note 3 of our 2018 Annual Report on Form 10-K. Fair Value of Certain Financial Instruments Following is a summary of the carrying values and estimated fair values of certain financial instruments: June 30, 2019 December 31, 2018 (In millions) Carrying Estimated Level Carrying Estimated Level Financial assets: HTM investment securities $ 695 $ 698 2 $ 774 $ 767 2 Loans and leases (including loans held for sale), net of allowance 48,219 47,475 3 46,312 45,251 3 Financial liabilities: Time deposits 4,915 4,923 2 4,336 4,319 2 Long-term debt 1,236 1,248 2 724 727 2 This summary excludes financial assets and liabilities for which carrying value approximates fair value and financial instruments that are recorded at fair value on a recurring basis. For additional information regarding the financial instruments within the scope of this disclosure, and the methods and significant assumptions used to estimate their fair value, see Note 3 of our 2018 Annual Report on Form 10-K.

Offsetting Assets and Liabiliti

Offsetting Assets and Liabilities (Notes)	6 Months Ended
	Jun. 30, 2019
Offsetting Assets and Liabilities [Abstract]
Cash, Cash Equivalents, and Short-term Investments [Text Block]	OFFSETTING ASSETS AND LIABILITIES Gross and net information for selected financial instruments in the balance sheet is as follows: June 30, 2019 (In millions) Gross amounts not offset in the balance sheet Description Gross amounts recognized Gross amounts offset in the balance sheet Net amounts presented in the balance sheet Financial instruments Cash collateral received/pledged Net amount Assets: Federal funds sold and security resell agreements $ 876 $ (256) $ 620 $ — $ — $ 620 Derivatives (included in other assets) 170 — 170 (10) (14) 146 Total assets $ 1,046 $ (256) $ 790 $ (10) $ (14) $ 766 Liabilities: Federal funds and other short-term borrowings $ 6,279 $ (256) $ 6,023 $ — $ — $ 6,023 Derivatives (included in other liabilities) 14 — 14 (10) (2) 2 Total Liabilities $ 6,293 $ (256) $ 6,037 $ (10) $ (2) $ 6,025 December 31, 2018 (In millions) Gross amounts not offset in the balance sheet Description Gross amounts recognized Gross amounts offset in the balance sheet Net amounts presented in the balance sheet Financial instruments Cash collateral received/pledged Net amount Assets: Federal funds sold and security resell agreements $ 1,461 $ — $ 1,461 $ — $ — $ 1,461 Derivatives (included in other assets) 45 — 45 (35) (3) 7 Total assets $ 1,506 $ — $ 1,506 $ (35) $ (3) $ 1,468 Liabilities: Federal funds and other short-term borrowings $ 5,653 $ — $ 5,653 $ — $ — $ 5,653 Derivatives (included in other liabilities) 39 — 39 (35) (1) 3 Total Liabilities $ 5,692 $ — $ 5,692 $ (35) $ (1) $ 5,656 Security repurchase and reverse repurchase (“resell”) agreements are offset, when applicable, in the balance sheet according to master netting agreements. Security repurchase agreements are included with “Federal funds and other short-term borrowings.” Derivative instruments may be offset under their master netting agreements; however, for accounting purposes, we present these items on a gross basis in the Bank’s balance sheet. See Note 7 for further information regarding derivative instruments.

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2019
Investments [Abstract]
Investment Securities	INVESTMENTS Investment Securities Securities are classified as HTM, AFS or trading. HTM securities, which management has the intent and ability to hold until maturity, are carried at amortized cost. AFS securities are carried at fair value and unrealized gains and losses, after applicable taxes, are recorded as net increases or decreases to accumulated other comprehensive income (“AOCI”). Realized gains and losses on AFS securities are determined by using the cost basis of each individual security. Trading securities are carried at fair value with gains and losses recognized in current period earnings. The purchase premiums for callable debt securities classified as HTM or AFS are amortized at a constant effective yield to the earliest call date. The purchase premiums and discounts for all other HTM and AFS securities are amortized and accreted at a constant effective yield to the contractual maturity date and no assumption is made concerning prepayments. As principal prepayments occur, the portion of the unamortized premium or discount associated with the principal reduction is recognized in interest income in the period the principal is reduced. Note 3 of our 2018 Annual Report on Form 10-K discusses the process to estimate fair value for investment securities. June 30, 2019 (In millions) Amortized Gross unrealized gains Gross unrealized losses Estimated Held-to-maturity Municipal securities $ 695 $ 5 $ 2 $ 698 Available-for-sale U.S. Treasury securities 40 — — 40 U.S. Government agencies and corporations: Agency securities 1,372 6 5 1,373 Agency guaranteed mortgage-backed securities 10,110 86 63 10,133 Small Business Administration loan-backed securities 1,790 1 40 1,751 Municipal securities 1,322 28 — 1,350 Other debt securities 25 — — 25 Total available-for-sale 14,659 121 108 14,672 Total investment securities $ 15,354 $ 126 $ 110 $ 15,370 December 31, 2018 (In millions) Amortized Gross unrealized gains Gross unrealized losses Estimated Held-to-maturity Municipal securities $ 774 $ 4 $ 11 $ 767 Available-for-sale U.S. Treasury securities 40 — — 40 U.S. Government agencies and corporations: Agency securities 1,394 — 19 1,375 Agency guaranteed mortgage-backed securities 10,236 18 240 10,014 Small Business Administration loan-backed securities 2,042 1 47 1,996 Municipal securities 1,303 4 16 1,291 Other debt securities 25 — 4 21 Total available-for-sale debt securities 15,040 23 326 14,737 Total investment securities $ 15,814 $ 27 $ 337 $ 15,504 Maturities The amortized cost and estimated fair value of investment debt securities are shown subsequently as of June 30, 2019, by contractual maturity of principal payments. Actual principal payments may differ from contractual or expected principal payments because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. June 30, 2019 Held-to-maturity Available-for-sale (In millions) Amortized Estimated Amortized Estimated Due in one year or less $ 138 $ 138 $ 177 $ 177 Due after one year through five years 258 259 633 636 Due after five years through ten years 155 158 2,824 2,835 Due after ten years 144 143 11,025 11,024 Total debt investment securities $ 695 $ 698 $ 14,659 $ 14,672 The following is a summary of the amount of gross unrealized losses for debt securities and the estimated fair value by length of time the securities have been in an unrealized loss position: June 30, 2019 Less than 12 months 12 months or more Total (In millions) Gross Estimated Gross Estimated Gross Estimated Held-to-maturity Municipal securities $ — $ 13 $ 2 $ 275 $ 2 $ 288 Available-for-sale U.S. Government agencies and corporations: Agency securities — 14 5 606 5 620 Agency guaranteed mortgage-backed securities 1 72 62 4,535 63 4,607 Small Business Administration loan-backed securities 1 34 39 1,430 40 1,464 Municipal securities — 30 — 159 — 189 Other — — — 15 — 15 Total available-for-sale 2 150 106 6,745 108 6,895 Total investment securities $ 2 $ 163 $ 108 $ 7,020 $ 110 $ 7,183 December 31, 2018 Less than 12 months 12 months or more Total (In millions) Gross Estimated Gross Estimated Gross Estimated Held-to-maturity Municipal securities $ 1 $ 86 $ 10 $ 438 $ 11 $ 524 Available-for-sale U.S. Government agencies and corporations: Agency securities 2 245 17 913 19 1,158 Agency guaranteed mortgage-backed securities 16 1,081 224 6,661 240 7,742 Small Business Administration loan-backed securities 19 1,180 28 711 47 1,891 Municipal securities 2 266 14 641 16 907 Other — — 4 11 4 11 Total available-for-sale 39 2,772 287 8,937 326 11,709 Total investment securities $ 40 $ 2,858 $ 297 $ 9,375 $ 337 $ 12,233 At June 30, 2019 and December 31, 2018, respectively, 284 and 606 HTM and 1,182 and 2,588 AFS investment securities were in an unrealized loss position. Other-Than-Temporary Impairment The Bank did not recognize any OTTI on its investment securities portfolio during the first six months of 2019. We review investment securities on a quarterly basis for the presence of OTTI. Unrealized losses relate to changes in interest rates subsequent to purchase and are not attributable to credit. At June 30, 2019, we did not have an intent to sell identified securities with unrealized losses or initiate such sales, and we believe it is not more likely than not we would be required to sell such securities before recovery of their amortized cost basis. For additional information on our policy and evaluation process relating to OTTI, see Note 5 of our 2018 Annual Report on Form 10-K. The following summarizes gains and losses that were recognized in the statement of income: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 (In millions) Gross gains Gross losses Gross gains Gross losses Gross gains Gross losses Gross gains Gross losses Other noninterest-bearing investments $ 1 $ 4 $ 4 $ 3 $ 5 $ 7 $ 6 $ 5 Net gains (losses) 1 $ (3) $ 1 $ (2) $ 1 1 Net gains were recognized in securities gains (losses), net in the statement of income. Interest income by security type is as follows: Three Months Ended June 30, 2019 2018 (In millions) Taxable Nontaxable Total Taxable Nontaxable Total Investment securities: Held-to-maturity $ 2 $ 4 $ 6 $ 3 $ 3 $ 6 Available-for-sale 81 6 87 70 7 77 Trading — 2 2 — 2 2 Total securities $ 83 $ 12 $ 95 $ 73 $ 12 $ 85 Six Months Ended June 30, 2019 2018 (In millions) Taxable Nontaxable Total Taxable Nontaxable Total Investment securities: Held-to-maturity $ 4 $ 8 $ 12 $ 5 $ 7 $ 12 Available-for-sale 164 12 176 142 13 155 Trading — 3 3 — 3 3 Total $ 168 $ 23 $ 191 $ 147 $ 23 $ 170 Investment securities with a carrying value of $2.1 billion at June 30, 2019 and $2.6 billion at December 31, 2018, respectively, were pledged to secure public and trust deposits, advances, and for other purposes as required by law. Securities are also pledged as collateral for security repurchase agreements.

Loans And Allowance For Credit

Loans And Allowance For Credit Losses	6 Months Ended
	Jun. 30, 2019
Loans And Allowance For Credit Losses [Abstract]
Loans And Allowance For Credit Losses	LOANS AND ALLOWANCE FOR CREDIT LOSSES Loans and Loans Held for Sale Loans are summarized as follows according to major portfolio segment and specific loan class: (In millions) June 30, December 31, Loans held for sale $ 105 $ 93 Commercial: Commercial and industrial $ 14,883 $ 14,513 Leasing 337 327 Owner-occupied 7,828 7,661 Municipal 2,059 1,661 Total commercial 25,107 24,162 Commercial real estate: Construction and land development 2,609 2,186 Term 9,218 8,939 Total commercial real estate 11,827 11,125 Consumer: Home equity credit line 2,929 2,937 1-4 family residential 7,440 7,176 Construction and other consumer real estate 644 643 Bankcard and other revolving plans 502 491 Other 168 180 Total consumer 11,683 11,427 Total loans 1 $ 48,617 $ 46,714 1 Loans are presented net of unearned income, unamortized purchase premiums and discounts, and net deferred loan fees and costs totaling $52 million and $50 million at June 30, 2019 and December 31, 2018, respectively. Municipal loans generally include loans to state and local governments (“municipalities”) with the debt service being repaid from general funds or pledged revenues of the municipal entity, or to private commercial entities or 501(c)(3) not-for-profit entities utilizing a pass-through municipal entity to achieve favorable tax treatment. Land acquisition and development loans included in the construction and land development loan portfolio were $210 million at June 30, 2019 and $237 million at December 31, 2018. Loans with a carrying value of approximately $23.3 billion at June 30, 2019 and $22.6 billion at December 31, 2018 have been pledged at the Federal Reserve or the FHLB of Des Moines as collateral for current and potential borrowings. We sold loans totaling $132 million and $250 million for the three and six months ended June 30, 2019 and $206 million and $312 million for the three and six months ended June 30, 2018 , respectively, that were classified as loans held for sale. The sold loans were derecognized from the balance sheet. Loans classified as loans held for sale primarily consist of conforming residential mortgages and the guaranteed portion of Small Business Administration (“SBA”) loans. The loans are mainly sold to U.S. government agencies or participated to third parties. At times, we have continuing involvement in the transferred loans in the form of servicing rights or a guarantee from the respective issuer. Amounts added to loans held for sale during these same periods were $170 million and $263 million for the three and six months ended June 30, 2019 and $235 million and $400 million for the three and six months ended June 30, 2018, respectively. See Note 5 for further information regarding guaranteed securities. The principal balance of sold loans for which we retain servicing was approximately $2.2 billion at both June 30, 2019 and December 31, 2018. Income from loans sold, excluding servicing, was $3 million and $5 million for the six months ended June 30, 2019 and $4 million and $7 million for the three and six months ended June 30, 2018, respectively. Allowance for Credit Losses The allowance for credit losses (“ACL”) consists of the allowance for loan and lease losses (“ALLL”) and the reserve for unfunded lending commitments (“RULC”). The ALLL represents our estimate of probable and estimable losses inherent in the loan and lease portfolio as of the balance sheet date. We also estimate a reserve for potential losses associated with off-balance sheet commitments, including standby letters of credit. We determine the RULC using the same procedures and methodologies that we use for the ALLL. For additional information regarding our policies and methodologies used to estimate the ACL, see Note 6 of our 2018 Annual Report on Form 10-K. Changes in the allowance for credit losses are summarized as follows: Three Months Ended June 30, 2019 (In millions) Commercial Commercial Consumer Total Allowance for loan losses Balance at beginning of period $ 328 $ 113 $ 56 $ 497 Provision for loan losses 23 1 (4) 20 Deductions: Gross loan and lease charge-offs 19 — 4 23 Recoveries 6 — 3 9 Net loan and lease charge-offs (recoveries) 13 — 1 14 Balance at end of period $ 338 $ 114 $ 51 $ 503 Reserve for unfunded lending commitments Balance at beginning of period $ 42 $ 17 $ — $ 59 Provision for unfunded lending commitments (1) 2 — 1 Balance at end of period $ 41 $ 19 $ — $ 60 Total allowance for credit losses at end of period Allowance for loan losses $ 338 $ 114 $ 51 $ 503 Reserve for unfunded lending commitments 41 19 — 60 Total allowance for credit losses $ 379 $ 133 $ 51 $ 563 Six Months Ended June 30, 2019 (In millions) Commercial Commercial Consumer Total Allowance for loan losses Balance at beginning of period $ 331 $ 110 $ 54 $ 495 Provision for loan losses 22 2 (2) 22 Deductions: Gross loan and lease charge-offs 27 1 7 35 Recoveries 12 3 6 21 Net loan and lease charge-offs (recoveries) 15 (2) 1 14 Balance at end of period $ 338 $ 114 $ 51 $ 503 Reserve for unfunded lending commitments Balance at beginning of period $ 40 $ 17 $ — $ 57 Provision for unfunded lending commitments 1 2 — 3 Balance at end of period $ 41 $ 19 $ — $ 60 Total allowance for credit losses at end of period Allowance for loan losses $ 338 $ 114 $ 51 $ 503 Reserve for unfunded lending commitments 41 19 — 60 Total allowance for credit losses $ 379 $ 133 $ 51 $ 563 Three Months Ended June 30, 2018 (In millions) Commercial Commercial Consumer Total Allowance for loan losses Balance at beginning of period $ 329 $ 104 $ 40 $ 473 Provision for loan losses (18) 15 8 5 Gross loan and lease charge-offs 10 — 3 13 Recoveries 20 3 2 25 Net loan and lease charge-offs (recoveries) (10) (3) 1 (12) Balance at end of period $ 321 $ 122 $ 47 $ 490 Reserve for unfunded lending commitments Balance at beginning of period $ 40 $ 11 $ — $ 51 Provision for unfunded lending commitments 3 4 — 7 Balance at end of period $ 43 $ 15 $ — $ 58 Total allowance for credit losses at end of period Allowance for loan losses $ 321 $ 122 $ 47 $ 490 Reserve for unfunded lending commitments 43 15 — 58 Total allowance for credit losses $ 364 $ 137 $ 47 $ 548 Six Months Ended June 30, 2018 (In millions) Commercial Commercial Consumer Total Allowance for loan losses Balance at beginning of period $ 371 $ 103 $ 44 $ 518 Provision for loan losses (58) 14 9 (35) Gross loan and lease charge-offs 30 — 9 39 Recoveries 38 5 3 46 Net loan and lease charge-offs (recoveries) (8) (5) 6 (7) Balance at end of period $ 321 $ 122 $ 47 $ 490 Reserve for unfunded lending commitments Balance at beginning of period $ 48 $ 10 $ — $ 58 Provision for unfunded lending commitments (5) 5 — — Balance at end of period $ 43 $ 15 $ — $ 58 Total allowance for credit losses at end of period Allowance for loan losses $ 321 $ 122 $ 47 $ 490 Reserve for unfunded lending commitments 43 15 — 58 Total allowance for credit losses $ 364 $ 137 $ 47 $ 548 The ALLL and outstanding loan balances according to the Bank’s impairment method are summarized as follows: June 30, 2019 (In millions) Commercial Commercial Consumer Total Allowance for loan losses: Individually evaluated for impairment $ 11 $ 1 $ 2 $ 14 Collectively evaluated for impairment 327 113 49 489 Total $ 338 $ 114 $ 51 $ 503 Outstanding loan balances: Individually evaluated for impairment $ 168 $ 48 $ 69 $ 285 Collectively evaluated for impairment 24,939 11,779 11,614 48,332 Total $ 25,107 $ 11,827 $ 11,683 $ 48,617 December 31, 2018 (In millions) Commercial Commercial Consumer Total Allowance for loan losses: Individually evaluated for impairment $ 6 $ 1 $ 2 $ 9 Collectively evaluated for impairment 325 109 52 486 Total $ 331 $ 110 $ 54 $ 495 Outstanding loan balances: Individually evaluated for impairment $ 164 $ 55 $ 72 $ 291 Collectively evaluated for impairment 23,998 11,070 11,355 46,423 Total $ 24,162 $ 11,125 $ 11,427 $ 46,714 Nonaccrual and Past Due Loans Loans are generally placed on nonaccrual status when payment in full of principal and interest is not expected, or the loan is 90 days or more past due as to principal or interest, unless the loan is both well secured and in the process of collection. For further discussion of our policies and processes regarding nonaccrual and past due loans, see Note 6 of our 2018 Annual Report on Form 10-K. Nonaccrual loans are summarized as follows: (In millions) June 30, December 31, Loans held for sale $ — $ 6 Commercial: Commercial and industrial $ 85 $ 82 Leasing 1 2 Owner-occupied 69 67 Municipal 1 1 Total commercial 156 152 Commercial real estate: Construction and land development 1 — Term 31 38 Total commercial real estate 32 38 Consumer: Home equity credit line 12 13 1-4 family residential 44 42 Construction and other consumer real estate 4 — Bankcard and other revolving plans — 1 Other — — Total consumer loans 60 56 Total $ 248 $ 246 Past due loans (accruing and nonaccruing) are summarized as follows: June 30, 2019 (In millions) Current 30-89 days 90+ days Total Total Accruing Nonaccrual loans that are current 1 Loans held for sale $ 105 $ — $ — $ — $ 105 $ — $ — Commercial: Commercial and industrial $ 14,820 $ 37 $ 26 $ 63 $ 14,883 $ 4 $ 53 Leasing 337 — — — 337 — 1 Owner-occupied 7,771 32 25 57 7,828 6 47 Municipal 2,058 — 1 1 2,059 — — Total commercial 24,986 69 52 121 25,107 10 101 Commercial real estate: Construction and land development 2,580 23 6 29 2,609 5 — Term 9,202 10 6 16 9,218 — 24 Total commercial real estate 11,782 33 12 45 11,827 5 24 Consumer: Home equity credit line 2,919 6 4 10 2,929 — 6 1-4 family residential 7,411 8 21 29 7,440 — 17 Construction and other consumer real estate 640 1 3 4 644 — — Bankcard and other revolving plans 497 3 2 5 502 2 — Other 167 1 — 1 168 — — Total consumer loans 11,634 19 30 49 11,683 2 23 Total $ 48,402 $ 121 $ 94 $ 215 $ 48,617 $ 17 $ 148 December 31, 2018 (In millions) Current 30-89 days 90+ days Total Total Accruing Nonaccrual loans that are current 1 Loans held for sale $ 89 $ — $ 4 $ 4 $ 93 $ — $ 2 Commercial: Commercial and industrial $ 14,445 $ 37 $ 31 $ 68 $ 14,513 $ 4 $ 46 Leasing 325 1 1 2 327 — 1 Owner-occupied 7,621 23 17 40 7,661 3 48 Municipal 1,661 — — — 1,661 — 1 Total commercial 24,052 61 49 110 24,162 7 96 Commercial real estate: Construction and land development 2,185 1 — 1 2,186 — — Term 8,924 4 11 15 8,939 1 26 Total commercial real estate 11,109 5 11 16 11,125 1 26 Consumer: Home equity credit line 2,927 4 6 10 2,937 — 4 1-4 family residential 7,143 15 18 33 7,176 — 19 Construction and other consumer real estate 642 1 — 1 643 — — Bankcard and other revolving plans 487 2 2 4 491 2 — Other 179 1 — 1 180 — — Total consumer loans 11,378 23 26 49 11,427 2 23 Total $ 46,539 $ 89 $ 86 $ 175 $ 46,714 $ 10 $ 145 1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected. Credit Quality Indicators In addition to the past due and nonaccrual criteria, we also analyze loans using loan risk-grading systems, which vary based on the size and type of credit risk exposure. The internal risk grades assigned to loans follow our definitions of Pass, Special Mention, Sub-standard, and Doubtful, which are consistent with published definitions of regulatory risk classifications. For further discussion of our policies and processes regarding credit quality indicators and internal loan risk-grading, see Note 6 of our 2018 Annual Report on Form 10-K. Outstanding loan balances (accruing and nonaccruing) categorized by these credit quality classifications are summarized as follows: June 30, 2019 (In millions) Pass Special Sub- Doubtful Total Total Commercial: Commercial and industrial $ 14,247 $ 273 $ 363 $ — $ 14,883 Leasing 321 11 5 — 337 Owner-occupied 7,524 77 227 — 7,828 Municipal 2,032 — 27 — 2,059 Total commercial 24,124 361 622 — 25,107 $ 338 Commercial real estate: Construction and land development 2,586 16 7 — 2,609 Term 9,111 39 68 — 9,218 Total commercial real estate 11,697 55 75 — 11,827 114 Consumer: Home equity credit line 2,913 — 16 — 2,929 1-4 family residential 7,391 — 49 — 7,440 Construction and other consumer real estate 639 — 5 — 644 Bankcard and other revolving plans 499 — 3 — 502 Other 168 — — — 168 Total consumer loans 11,610 — 73 — 11,683 51 Total $ 47,431 $ 416 $ 770 $ — $ 48,617 $ 503 December 31, 2018 (In millions) Pass Special Sub- Doubtful Total Total Commercial: Commercial and industrial $ 13,891 $ 322 $ 300 $ — $ 14,513 Leasing 313 10 4 — 327 Owner-occupied 7,369 72 220 — 7,661 Municipal 1,632 2 27 — 1,661 Total commercial 23,205 406 551 — 24,162 $ 331 Commercial real estate: Construction and land development 2,174 11 1 — 2,186 Term 8,853 10 76 — 8,939 Total commercial real estate 11,027 21 77 — 11,125 110 Consumer: Home equity credit line 2,920 — 17 — 2,937 1-4 family residential 7,129 — 47 — 7,176 Construction and other consumer real estate 641 — 2 — 643 Bankcard and other revolving plans 488 — 3 — 491 Other 179 — 1 — 180 Total consumer loans 11,357 — 70 — 11,427 54 Total $ 45,589 $ 427 $ 698 $ — $ 46,714 $ 495 Impaired Loans Loans are considered impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due in accordance with the contractual terms of the loan agreement, including scheduled interest payments. Payments received on impaired loans that are accruing are recognized in interest income, according to the contractual loan agreement. Payments received on impaired loans that are on nonaccrual are not recognized in interest income, but are applied as a reduction to the principal outstanding. The amount of interest income recognized on a cash basis during the time the loans were impaired within the three months ended June 30, 2019 and 2018 was not significant. For additional information regarding our policies and methodologies used to evaluate impaired loans, see Note 6 of our 2018 Annual Report on Form 10-K. Information on impaired loans individually evaluated is summarized as follows, including the average recorded investment and interest income recognized for the three and six months ended June 30, 2019 and 2018: June 30, 2019 (In millions) Unpaid Recorded investment Total Related with no with Commercial: Commercial and industrial $ 129 $ 36 $ 62 $ 98 $ 10 Owner-occupied 63 44 11 55 1 Municipal 1 1 — 1 — Total commercial 193 81 73 154 11 Commercial real estate: Construction and land development — — — — — Term 38 32 2 34 — Total commercial real estate 38 32 2 34 — Consumer: Home equity credit line 15 12 2 14 — 1-4 family residential 60 29 23 52 2 Construction and other consumer real estate 3 1 2 3 — Other — — — — — Total consumer loans 78 42 27 69 2 Total $ 309 $ 155 $ 102 $ 257 $ 13 December 31, 2018 (In millions) Unpaid Recorded investment Total Related with no with Commercial: Commercial and industrial $ 112 $ 52 $ 36 $ 88 $ 4 Owner-occupied 67 31 29 60 2 Municipal 1 1 — 1 — Total commercial 180 84 65 149 6 Commercial real estate: Construction and land development 1 — — — — Term 44 37 3 40 — Total commercial real estate 45 37 3 40 — Consumer: Home equity credit line 15 12 2 14 — 1-4 family residential 69 32 25 57 2 Construction and other consumer real estate 1 1 — 1 — Other — — — — — Total consumer loans 85 45 27 72 2 Total $ 310 $ 166 $ 95 $ 261 $ 8 Three Months Ended Six Months Ended (In millions) Average Interest Average Interest Commercial: Commercial and industrial $ 108 $ 1 $ 96 $ 2 Owner-occupied 59 — 60 — Municipal 1 — 1 — Total commercial 168 1 157 2 Commercial real estate: Construction and land development — — — — Term 39 — 37 — Total commercial real estate 39 — 37 — Consumer: Home equity credit line 14 — 14 — 1-4 family residential 55 — 55 — Construction and other consumer real estate 3 — 2 — Other — — — — Total consumer loans 72 — 71 — Total $ 279 $ 1 $ 265 $ 2 Three Months Ended Six Months Ended (In millions) Average Interest Average Interest Commercial: Commercial and industrial $ 138 $ — $ 126 $ — Owner-occupied 54 — 55 8 Municipal 1 — 1 — Total commercial 193 — 182 8 Commercial real estate: Construction and land development 5 — 5 — Term 58 — 53 — Total commercial real estate 63 — 58 — Consumer: Home equity credit line 15 — 14 — 1-4 family residential 57 — 55 — Construction and other consumer real estate 2 — 1 — Other — — — — Total consumer loans 74 — 70 — Total $ 330 $ — $ 310 $ 8 Modified and Restructured Loans Loans may be modified in the normal course of business for competitive reasons or to strengthen the Bank’s position. Loan modifications and restructurings may also occur when the borrower experiences financial difficulty and needs temporary or permanent relief from the original contractual terms of the loan. Loans that have been modified to accommodate a borrower who is experiencing financial difficulties, and for which the Bank has granted a concession that it would not otherwise consider, are considered troubled debt restructurings (“TDRs”). For further discussion of our policies and processes regarding TDRs, see Note 6 of our 2018 Annual Report on Form 10-K. Selected information on TDRs that includes the recorded investment on an accruing and nonaccruing basis by loan class and modification type is summarized in the following schedules: June 30, 2019 Recorded investment resulting from the following modification types: (In millions) Interest Maturity Principal Payment Other 1 Multiple modification types 2 Total Accruing Commercial: Commercial and industrial $ 2 $ 4 $ — $ — $ 14 $ 9 $ 29 Owner-occupied 4 1 — — 3 6 14 Municipal — — — — — — — Total commercial 6 5 — — 17 15 43 Commercial real estate: Construction and land development — — — — — — — Term 1 2 — 1 — 4 8 Total commercial real estate 1 2 — 1 — 4 8 Consumer: Home equity credit line — 2 7 — — 3 12 1-4 family residential 1 1 6 — 1 24 33 Construction and other consumer real estate — 1 — — — — 1 Total consumer loans 1 4 13 — 1 27 46 Total accruing 8 11 13 1 18 46 97 Nonaccruing Commercial: Commercial and industrial 1 5 — 1 1 26 34 Owner-occupied 6 1 — — 1 6 14 Municipal — — — — — 1 1 Total commercial 7 6 — 1 2 33 49 Commercial real estate: Term 3 — — 2 3 11 19 Total commercial real estate 3 — — 2 3 11 19 Consumer: Home equity credit line — — 1 — — 1 2 1-4 family residential — — 1 1 1 6 9 Total consumer loans — — 2 1 1 7 11 Total nonaccruing 10 6 2 4 6 51 79 Total $ 18 $ 17 $ 15 $ 5 $ 24 $ 97 $ 176 1 Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc. 2 Includes TDRs that resulted from a combination of any of the previous modification types. December 31, 2018 Recorded investment resulting from the following modification types: (In millions) Interest Maturity Principal Payment Other 1 Multiple modification types 2 Total Accruing Commercial: Commercial and industrial $ 2 $ 4 $ — $ — $ 15 $ 7 $ 28 Owner-occupied 3 2 — — 2 14 21 Total commercial 5 6 — — 17 21 49 Commercial real estate: Construction and land development — — — — — — — Term 2 2 — 1 — 6 11 Total commercial real estate 2 2 — 1 — 6 11 Consumer: Home equity credit line — 1 8 — — 3 12 1-4 family residential 1 2 6 1 1 28 39 Construction and other consumer real estate — — — — — 1 1 Total consumer loans 1 3 14 1 1 32 52 Total accruing 8 11 14 2 18 59 112 Nonaccruing Commercial: Commercial and industrial 1 6 — 1 10 27 45 Owner-occupied 6 — — 1 2 5 14 Municipal — — — — — 1 1 Total commercial 7 6 — 2 12 33 60 Commercial real estate: Term 3 — — 2 14 1 20 Total commercial real estate 3 — — 2 14 1 20 Consumer: Home equity credit line — — 1 — — — 1 1-4 family residential — — 1 — 1 7 9 Total consumer loans — — 2 — 1 7 10 Total nonaccruing 10 6 2 4 27 41 90 Total $ 18 $ 17 $ 16 $ 6 $ 45 $ 100 $ 202 1 Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc. 2 Includes TDRs that resulted from a combination of any of the previous modification types. Unfunded lending commitments on TDRs amounted to approximately $12 million and $11 million at June 30, 2019 and December 31, 2018, respectively. The total recorded investment of all TDRs in which interest rates were modified below market was $84 million at June 30, 2019 and $88 million at December 31, 2018. These loans are included in the previous schedule in the columns for interest rate below market and multiple modification types. The net financial impact on interest income due to interest rate modifications below market for accruing TDRs for the three and six months ended June 30, 2019 and 2018 was not significant. On an ongoing basis, we monitor the performance of all TDRs according to their restructured terms. Subsequent payment default is defined in terms of delinquency, when principal or interest payments are past due 90 days or more for commercial loans, or 60 days or more for consumer loans. The recorded investment of accruing and nonaccruing TDRs that had a payment default during the period listed below (and are still in default at period end) and are within 12 months or less of being modified as TDRs is as follows: Three Months Ended Six Months Ended (In millions) Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial: Commercial and industrial $ — $ 3 $ 3 $ — $ 6 $ 6 Owner-occupied — — — — — — Total commercial — 3 3 — 6 6 Commercial real estate: Term — — — — 1 1 Consumer: 1-4 family residential — 1 1 — 1 1 Total $ — $ 4 $ 4 $ — $ 8 $ 8 Three Months Ended Six Months Ended (In millions) Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial: Commercial and industrial $ — $ 5 $ 5 $ — $ 5 $ 5 Owner-occupied — — — — 1 1 Total commercial — 5 5 — 6 6 Commercial real estate: Term — 2 2 — 2 2 Consumer: 1-4 family residential — 1 1 — 1 1 Total $ — $ 8 $ 8 $ — $ 9 $ 9 Note: Total loans modified as TDRs during the 12 months previous to June 30, 2019 and 2018 were $69 million and $73 million, respectively. At June 30, 2019 and December 31, 2018, the amount of foreclosed residential real estate property held by the Bank was approximately $1 million and $2 million, and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure was approximately $8 million and $10 million, respectively. Concentrations of Credit Risk Credit risk is the possibility of loss from the failure of a borrower, guarantor, or another obligor to fully perform under the terms of a credit-related contract. We perform an ongoing analysis of our loan portfolio to evaluate whether there is any significant exposure to any concentrations of credit risk. See Note 6 of our 2018 Annual Report on Form 10-K for further discussion of our evaluation of credit risk concentrations. See also Note 7 of our 2018 Annual Report on Form 10-K for a discussion of counterparty risk associated with the Bank’s derivative transactions.

Derivative Instruments And Hedg

Derivative Instruments And Hedging Activities (Note)	6 Months Ended
	Jun. 30, 2019
Summary of Derivative Instruments [Abstract]
Derivative Instruments And Hedging Activities	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES Objectives and Accounting The Bank is exposed to certain risks arising from both its business operations and economic conditions. Our objectives in using derivatives are to add stability to interest income or expense, to modify the duration of specific assets or liabilities as we consider advisable, to manage exposure to interest rate movements or other identified risks, and/or to directly offset derivatives sold to our customers. For a detailed discussion of the use of and accounting policies regarding derivative instruments, see Note 7 of our 2018 Annual Report on Form 10-K. Fair Value Hedges – As of June 30, 2019, the Bank had $1 billion of interest rate swaps designated in two separate qualifying fair value hedge relationships. Each hedge has a notional amount of $500 million, with the first $500 million maturing in August of 2021 and the second $500 million maturing in February of 2022. The hedging instruments used are receive-fixed interest rate swaps converting the interest on our fixed-rate debt to floating. These hedges are designated as fair values hedges of the change in fair value of the London Interbank Offered Rate (“LIBOR”) benchmark swap rate component of the contractual coupon cash flows of these notes. Both swaps are structured to match the critical terms of the hedged notes, resulting in the expectation that the swaps will be highly effective as hedging instruments. The first swap has a received fixed-rate, or strike rate, of 3.50%, while the second swap, which was added during the first quarter of 2019, has a receive-fixed rate of 3.35%, making the average received-fixed strike rate 3.425% for our two existing fair value hedges which continued to be highly effective and meet all other requirements to remain designated and part of a qualifying hedge accounting relationship of the balance sheet date. The Bank has no remaining debt basis adjustments from previously designed fair value hedges so there is no scheduled amortization for previously terminated fair value hedges that will impact the Bank’s financial statements for the foreseeable future. Cash Flow Hedges – As of June 30, 2019, the Bank had $1.7 billion of interest rate swaps and $3.5 billion of interest rate floors designated as cash flow hedges of pools of floating-rate commercial loans. The bank had 24 active interest rate swaps as of June 30, 2019 with a weighted-average maturity of approximately 2.8 years, compared with 2.7 years at March 31, 2019, and a weighted average received-fixed strike rate of 2.1%. During the second quarter of 2019, two of these receive-fixed interest rate swaps matured, each had a notional amount of $75 million. An additional three swaps will mature by year end, and seven total swaps maturing by the end of the second quarter of 2020. During the quarter, the Bank continued to expand its protection against its exposure to potential net interest income and margin compression in a down interest rate environment by expanding its cash flow hedge portfolio by adding four receive-fixed swaps with individual notional amounts of $100 million each (aggregate notional of $400 million). The four additional swaps added to the Bank's cash flow hedge portfolio have maturities ranging from three to five years in tenor. During the first quarter of 2019 the Bank expanded its cash flow hedging program to include purchased floors. The Bank added one additional floor during the second quarter of 2019 with a $500 million notional and a strike rate of 1.5% and a term of approximately 3 years, consistent with the terms of the rest of the cash flow hedge floor portfolio. The additional floor increased the total floor notional to $3.5 billion, which is comprised of seven floors, each with a notional amount of $500 million, a strike rate of 1.5%, and an approximate life of 3 years. The floor added in the second quarter was purchased for $1.4 million making the aggregate purchase price of all seven floors purchased in the six months ended June 30, 2019 approximately $8 million. As of June 30, 2019, the fair value of the floors increased $15 million to $26 million as a result of the change in the LIBOR swap rate during the quarter. Shortly after the end of the second quarter, the Bank modified all of its floors to reduce the strike rate to 1% while doubling the notional amount from $3.5 billion to $7.0 billion. The modification did not result in any additional costs to the Bank. While the accounting is being finalized at the time of this filing, it is expected that there will be no significant changes to the periodic impact on interest income from the premium amortization or any other accounting changes of note. During the second quarter of 2019 the cash flow hedge swap portfolio increased in value by $26 million, which was recognized in AOCI. The fair value hedge swap portfolio increased in value by $12 million which was offset by the change in fair value of the hedged debt, resulting in no direct earnings impact. For the cash flow hedges, changes in fair value remain deferred in AOCI as long as the hedging relationship remains highly effective and qualifies for hedge accounting. Amounts deferred in AOCI are reclassified into earning in the periods in which the hedged forecasted transactions effect earnings. The premium on the purchased floors is deferred in AOCI and amortized using straight-line over the life of the hedges with the offsetting entry to the AOCI release being recorded as a reduction in interest income. Collateral and Credit Risk Exposure to credit risk arises from the possibility of nonperformance by counterparties. No significant losses on derivative instruments have occurred as a result of counterparty nonperformance. For a more detailed discussion of collateral and credit risk related to our derivative contracts, see Note 7 of our 2018 Annual Report on Form 10-K. Our derivative contracts require us to pledge collateral for derivatives that are in a net liability position at a given balance sheet date. Certain of these derivative contracts contain credit-risk-related contingent features that include the requirement to maintain a minimum debt credit rating. We may be required to pledge additional collateral if a credit-risk-related feature were triggered, such as a downgrade of our credit rating. However, in past situations, not all counterparties have demanded that additional collateral be pledged when provided for by the contractual terms. At June 30, 2019, the fair value of our derivative liabilities was $155 million, for which we were required to pledge cash collateral of approximately $64 million in the normal course of business. If our credit rating were downgraded one notch by either Standard & Poor’s (“S&P”) or Moody’s at June 30, 2019, there would likely be no additional collateral required to be pledged. As a result of the Dodd-Frank Wall Street Reform and Consumer Protection Act (“Dodd-Frank Act”), all newly eligible derivatives entered into are cleared through a central clearinghouse. Derivatives that are centrally cleared do not have credit-risk-related features that require additional collateral if our credit rating were downgraded. Derivative Amounts Selected information with respect to notional amounts and recorded gross fair values at June 30, 2019 and December 31, 2018, and the related gain (loss) of derivative instruments for the three and six months ended June 30, 2019 and 2018 is summarized as follows: June 30, 2019 December 31, 2018 Notional Fair value Notional Fair value (In millions) Other Other Other Other Derivatives designated as hedging instruments: Cash flow hedges: Purchased interest rate floors $ 3,500 $ 26 $ — $ — $ — $ — Received-fixed interest rate swaps 1,663 — — 687 — — Fair value hedges: Received-fixed interest rate swaps 1,000 — — 500 — — Total derivatives designated as hedging instruments 6,163 26 — 1,187 — — Derivatives not designated as hedging instruments: Customer-facing interest rate derivatives 1, 2 3,410 138 3 2,826 37 33 Offsetting interest rate derivatives 2 3,451 3 149 2,826 33 40 Other interest rate derivatives 570 2 1 300 1 1 Foreign exchange derivatives 366 3 2 389 4 2 Total derivatives not designated as hedging instruments 7,797 146 155 6,341 75 76 Total derivatives $ 13,960 $ 172 $ 155 $ 7,528 $ 75 $ 76 1 Customer-facing interest rate derivatives in an asset position include an $11 million and $3 million credit valuation adjustment reducing the fair value as of June 30, 2019 and December 31, 2018, respectively. 2 The fair value amounts for these derivatives do not include the settlement amounts for those trades that are cleared. Once the settlement amounts with the clearing houses are included the derivative fair values would be the following: June 30, 2019 December 31, 2018 (In millions) Other assets Other liabilities Other assets Other liabilities Customer-facing interest rate derivatives $ 136 $ 3 $ 7 $ 33 Offsetting interest rate derivatives 3 8 33 3 Amount of derivative gain (loss) recognized/reclassified Three Months Ended June 30, 2019 (In millions) Effective Portion of Derivatives Gain/(Loss) Deferred in OCI Excluded Components Deferred in OCI (Amortization Approach) Amount of Gain/(Loss) Reclassified From OCI into Income Other Noninterest Income/(Expense) Hedge Ineffectiveness / OCI Reclass due to Missed Forecast Derivatives designated as hedging instruments: Cash flow hedges of floating-rate assets 1 : Purchased interest rate floors $ 2 $ 15 $ (1) $ — $ — Interest rate swaps 24 — (1) — — Fair value hedges of fixed-rate debt: Receive-fixed interest rate swaps — — — — — Total derivatives designated as hedging instruments 26 15 (2) — — Derivatives not designated as hedging instruments: Customer-facing interest rate derivatives 86 Offsetting interest rate derivatives (85) Other interest rate derivatives (1) Foreign exchange derivatives 6 Total derivatives not designated as hedging instruments 6 Total derivatives $ 26 $ 15 $ (2) $ 6 $ — Amount of derivative gain (loss) recognized/reclassified Six Months Ended June 30, 2019 (In millions) Effective Portion of Derivatives Gain/(Loss) Deferred in OCI Excluded Components Deferred in OCI (Amortization Approach) Amount of Gain/(Loss) Reclassified From OCI into Income Other Noninterest Income/(Expense) Hedge Ineffectiveness / OCI Reclass due to Missed Forecast Derivatives designated as hedging instruments: Cash flow hedges of floating-rate assets 1 : Purchased interest rate floors $ 2 $ 18 $ (1) $ — $ — Interest rate swaps 33 — (3) — — Fair value hedges of fixed-rate debt: Receive-fixed interest rate swaps — — — — — Total derivatives designated as hedging instruments 35 18 (4) — — Derivatives not designated as hedging instruments: Customer-facing interest rate derivatives 132 Offsetting interest rate derivatives (130) Other interest rate derivatives (1) Foreign exchange derivatives 11 Total derivatives not designated as hedging instruments 12 Total derivatives $ 35 $ 18 $ (4) $ 12 $ — Amount of derivative gain (loss) recognized/reclassified Three Months Ended June 30, 2018 (In millions) Effective Portion of Derivatives Gain/(Loss) Deferred in OCI Excluded Components Deferred in OCI (Amortization Approach) Amount of Gain/(Loss) Reclassified From OCI into Income Other Noninterest Income/(Expense) Hedge Ineffectiveness / OCI Reclass due to Missed Forecast Derivatives designated as hedging instruments: Cash flow hedges of floating-rate assets 1 : Purchased interest rate floors $ — $ — $ — $ — $ — Interest rate swaps (2) — (1) — — Fair value hedges of fixed-rate debt: Receive-fixed interest rate swaps — — — — — Total derivatives designated as hedging instruments (2) — (1) — — Derivatives not designated as hedging instruments: Customer-facing interest rate derivatives (14) Offsetting interest rate derivatives 18 Other interest rate derivatives — Foreign exchange derivatives 5 Total derivatives not designated as hedging instruments 9 Total derivatives $ (2) $ — $ (1) $ 9 $ — Amount of derivative gain (loss) recognized/reclassified Six Months Ended June 30, 2018 (In millions) Effective Portion of Derivatives Gain/(Loss) Deferred in OCI Excluded Components Deferred in OCI (Amortization Approach) Amount of Gain/(Loss) Reclassified From OCI into Income Other Noninterest Income/(Expense) Hedge Ineffectiveness / OCI Reclass due to Missed Forecast Derivatives designated as hedging instruments: Cash flow hedges of floating-rate assets 1 : Purchased interest rate floors $ — $ — $ — $ — $ — Interest rate swaps (7) — (2) — — Fair value hedges of fixed-rate debt: Receive-fixed interest rate swaps — — — — — Total derivatives designated as hedging instruments (7) — (2) — — Derivatives not designated as hedging instruments: Customer-facing interest rate derivatives (43) Offsetting interest rate derivatives 57 Other interest rate derivatives — Foreign exchange derivatives 10 Total derivatives not designated as hedging instruments 24 Total derivatives $ (7) $ — $ (2) $ 24 $ — Note: These schedules are not intended to present at any given time the Bank’s long/short position with respect to its derivative contracts. 1 Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). For the 12 months following June 30, 2019, we estimate that $2 million will be reclassified from AOCI into interest income The following schedule presents derivatives used in fair value hedge accounting relationships, as well as pre-tax gains/(losses) recorded on such derivatives and the related hedged items for the periods presented. Gain/(loss) recorded in income Three Months Ended June 30, 2019 Three Months Ended June 30, 2018 (In millions) Derivatives 2 Hedged items Total income statement impact Derivatives 2 Hedged items Total income statement impact Interest rate swaps 1 $ 12 $ (12) $ — $ — $ — $ — Gain/(loss) recorded in income Six Months Ended June 30, 2019 Six Months Ended June 30, 2018 (In millions) Derivatives 2 Hedged items Total income statement impact Derivatives 2 Hedged items Total income statement impact Interest rate swaps 1 $ 18 $ (18) $ — $ — $ — $ — 1 Consists of hedges of benchmark interest rate risk of fixed-rate long-term debt. Gains and losses were recorded in net interest income. 2 The income for derivatives does not reflect interest income/expense to be consistent with the presentation of the gains/ (losses) on the hedged items. The following schedule provides selected information regarding the long-term debt in the statement of financial position in which the hedged item is included. Carrying amount of the hedged assets/(liabilities) Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities) (In millions) June 30, 2019 December 31, 2018 June 30, 2019 December 31, 2018 Long-term debt $ (1,022) $ (505) $ (22) $ (5) The fair value of derivative assets was reduced by a net credit valuation adjustment of $11 million and $1 million at June 30, 2019 and 2018, respectfully. The adjustment for derivative liabilities was zero at June 30, 2019 and a decrease of less than $2 million at June 30, 2018. These adjustments are required to reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk.

Leases (Notes)

Leases (Notes)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Lessee, Operating Leases [Text Block]	LEASES Leases In February 2016, the FASB issued ASU 2016-02, Leases (“Topic 842”), to increase transparency and comparability among organizations by requiring the recognition of ROU assets and lease liabilities on the balance sheet. Most prominent among the changes in the standard is the recognition of ROU assets and lease liabilities by lessees for those leases classified as operating leases. Under the standard, disclosures are required to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. Upon adoption the Bank has elected to use the following optional exemptions that are permitted under Topic 842, which have been applied consistently: • the Bank elected the optional transition method and there was no impact to retained earnings from recognizing the appropriate amount of lease assets and liabilities on the balance sheet as of the adoption date of the standard. Prior period financial statements were not restated. • the Bank elected the expedient package to not reassess (1) whether any existing or expired contracts are or contain leases, (2) lease classification for any existing or expired leases, and (3) initial direct costs for any existing leases. • the Bank elected to not separate lease components from non-lease components for all classes of underlying assets for lessee or lessor transactions. We determine if a contract is a lease or contains a lease at inception. The right to use leased assets for the lease term are considered ROU assets. Operating lease assets are included in “Other assets” while finance lease assets are included in “Premises, equipment and software, net.” Lease liabilities for operating leases are included in “Other liabilities” while finance leases are included in “Long-term debt” on our consolidated balance sheet. Lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. Because most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at the commencement date in determining the present value of future payments. The lease ROU asset also incorporates any amortization incurred, including initial direct costs, and excludes lease incentives received. Our lease terms may include options to extend or terminate the lease, and the lease term incorporates these when it is reasonably certain that we will exercise these options. The Bank enters into certain lease agreements with both lease and non-lease components, which are not separated out for lessees and lessors on a relative standalone basis. We have operating and finance leases for branches, corporate offices, and data centers. Our equipment leases are not material. At June 30, 2019, we had 432 branches, of which 277 are owned and 155 are leased. We lease our headquarters in Salt Lake City, Utah, and other office or data centers are either owned or leased. The Bank may enter into certain lease arrangements with a term of 12 months or less, and we have elected to exclude these from capitalization. The length of our commitments for leases ranges from 2019 to 2062, some of which include options to extend or terminate the leases. As of June 30, 2019, assets recorded under operating leases were $232 million, while assets recorded under finance leases were less than $1 million. We utilized a secured incremental borrowing rate based on the remaining term of the lease as of the effective date for the discount rate to determine our lease ROU assets and liabilities. The following schedule presents lease-related assets and liabilities, their weighted average remaining life, and the weighted average discount rate. (Dollar amounts in millions) June 30, Operating assets and liabilities Operating right-of-use assets, net of amortization $ 232 Operating lease liabilities 251 Weighted average remaining lease term (years) Operating leases 9.3 Finance leases 0.9 Weighted average discount rate Operating leases 3.2 % Finance leases 12.6 % The components of lease expense are as follows: (In millions) Three Months Ended Six Months Ended June 30, 2019 Operating lease costs $ 12 $ 24 Variable lease costs 13 26 Total lease cost $ 25 $ 50 Supplemental cash flow information related to leases is as follows: (In millions) Three Months Ended Six Months Ended June 30, 2019 Cash paid for amounts in the measurement of lease liabilities: Operating cash disbursements from operating leases $ 12 $ 24 Maturities analysis for lease liabilities as of June 30, 2019 is as follows (undiscounted lease payments): (In millions) 2019 1 $ 32 2020 47 2021 42 2022 37 2023 31 Thereafter 116 Total $ 305 1 Contractual maturities for the six months remaining in 2019. The Bank enters into certain lease agreements where it is the lessor of real estate. Real estate leases are made from bank-owned and subleased property to generate cash flow from the property, including from leasing vacant suites in which the Bank occupies portions of the building. Operating lease income was $3 million for both the second quarters of 2019 and 2018, and $6 million and $5 million for the first six months of 2019 and 2018. The Bank also has a lending division that makes equipment leases, considered to be sales-type leases or direct financing leases, totaling $337 million and $358 million as of June 30, 2019 and 2018, respectively. The Bank uses leasing of equipment as a venue for customers to access equipment without purchasing upfront. The Bank recorded income of $3 million on these leases for both the second quarters of 2019 and 2018, and $7 million for both the first six months of 2019 and 2018.

Debt And Shareholders' Equity

Debt And Shareholders' Equity	6 Months Ended
	Jun. 30, 2019
Capitalization, Long-term Debt and Equity [Abstract]
Debt And Shareholders' Equity	LONG-TERM DEBT AND SHAREHOLDERS’ EQUITY Long-Term Debt Long-term debt is summarized as follows: (In millions) June 30, December 31, 2018 Subordinated notes $ 87 $ 87 Senior notes 1,149 637 Total $ 1,236 $ 724 The preceding carrying values represent the par value of the debt adjusted for any unamortized premium or discount, unamortized debt issuance costs, and valuation adjustments for fair value swaps. During the first six months of 2019, the Bank issued a $500 million senior note with an interest rate of 3.35% and a maturity date of March 4, 2022. Common Stock The Bank’s common stock is traded on the National Association of Securities Dealers Automated Quotations (“NASDAQ”) Global Select Market. As of June 30, 2019, there were 176.9 million shares of 0.001 par value common stock outstanding. As of June 30, 2019, 29.3 million common stock warrants (NASDAQ: ZIONW), with an exercise price of $34.41, were outstanding, and each common stock warrant was convertible into 1.06 shares. These warrants expire on May 22, 2020. Common stock and additional paid-in capital was $3.3 billion at June 30, 2019, and decreased $535 million, or 14%, from December 31, 2018, primarily due to Bank common stock repurchases. During the second quarter of 2019, we continued our common stock buyback program and repurchased 5.8 million shares of common stock outstanding with a fair value of $275 million at an average price of $47.05 per share. During the first six months of 2019 we repurchased 11.3 million shares of common stock outstanding with a fair value of $550 million, at an average price of $48.50 per share compared to 4.3 million shares with a fair value of $235 million at an average price of $54.64 per share for the first six months of 2018. In July 2019, the Bank announced that the Board approved a plan to repurchase $275 million of common stock during the third quarter of 2019. Accumulated Other Comprehensive Income Accumulated other comprehensive income (loss) was $25 million at June 30, 2019 compared with $(250) million at December 31, 2018. Changes in AOCI by component are as follows: (In millions) Net unrealized gains (losses) on investment securities Net unrealized gains (losses) on derivatives and other Pension and post-retirement Total Six Months Ended June 30, 2019 Balance at December 31, 2018 $ (228) $ (1) $ (21) $ (250) OCI before reclassifications, net of tax 237 36 — 273 Amounts reclassified from AOCI, net of tax — 2 — 2 OCI 237 38 — 275 Balance at June 30, 2019 $ 9 $ 37 $ (21) $ 25 Income tax expense included in OCI $ 78 $ 12 $ — $ 90 Six Months Ended June 30, 2018 Balance at December 31, 2017 $ (114) $ (2) $ (23) $ (139) OCI (loss) before reclassifications, net of tax (175) (2) — (177) Amounts reclassified from AOCI, net of tax — 1 — 1 OCI (loss) (175) (1) — (176) Balance at June 30, 2018 $ (289) $ (3) $ (23) $ (315) Income tax benefit included in OCI $ (58) $ — $ — $ (58) Amounts reclassified from AOCI 1 Amounts reclassified from AOCI 1 Statement of income (SI) (In millions) Three Months Ended Six Months Ended Details about AOCI components 2019 2018 2019 2018 Affected line item Net unrealized losses on derivative instruments $ (2) $ (1) $ (4) $ (2) SI Interest and fees on loans Income tax benefit (1) — (2) (1) Amounts Reclassified from AOCI (1) (1) (2) (1) 1 Negative reclassification amounts indicate decreases to earnings in the statement of income.

Commitments, Guarantees, And Co

Commitments, Guarantees, And Contingent Liabilities	6 Months Ended
	Jun. 30, 2019
Guarantees, Commitments And Contingencies [Abstract]
Guarantees, Commitments And Contingencies	COMMITMENTS, GUARANTEES AND CONTINGENT LIABILITIES Commitments and Guarantees Contractual amounts of off-balance sheet financial instruments used to meet the financing needs of our customers are as follows: (In millions) June 30, December 31, Net unfunded commitments to extend credit 1 $ 22,529 $ 21,454 Standby letters of credit: Financial 527 655 Performance 189 199 Commercial letters of credit 19 18 Total unfunded lending commitments $ 23,264 $ 22,326 1 Net of participations The Bank’s 2018 Annual Report on Form 10-K contains further information about these commitments and guarantees including their terms and collateral requirements. At June 30, 2019, the Bank had recorded approximately $4 million as a liability for the guarantees associated with the standby letters of credit, which consisted of $1 million attributable to the RULC and $3 million of deferred commitment fees. Legal Matters We are subject to litigation in court and arbitral proceedings, as well as proceedings, investigations, examinations and other actions brought or considered by governmental and self-regulatory agencies. Litigation may relate to lending, deposit and other customer relationships, vendor and contractual issues, employee matters, intellectual property matters, personal injuries and torts, regulatory and legal compliance, and other matters. While most matters relate to individual claims, we are also subject to putative class action claims and similar broader claims. Proceedings, investigations, examinations and other actions brought or considered by governmental and self-regulatory agencies may relate to our banking, investment advisory, trust, securities, and other products and services; our customers’ involvement in money laundering, fraud, securities violations and other illicit activities or our policies and practices relating to such customer activities; and our compliance with the broad range of banking, securities and other laws and regulations applicable to us. At any given time, we may be in the process of responding to subpoenas, requests for documents, data and testimony relating to such matters and engaging in discussions to resolve the matters. As of June 30, 2019, we were subject to the following material litigation or governmental inquiries: • a civil suit, McFarland as Trustee for International Manufacturing Group v. CB&T, et. al. , brought against us in the United States Bankruptcy Court for the Eastern District of California in May 2016. The Trustee seeks to recover loan payments previously repaid to us by our customer, International Manufacturing Group (“IMG”), alleging that IMG, along with its principal, obtained loans and made loan repayments in furtherance of an alleged Ponzi scheme. Initial motion practice has been completed and discovery is underway. Mediation sessions were held in the second quarter of 2019. No trial date has been set. • a civil suit, JTS Communities, Inc. et. al v. CB&T, Jun Enkoji and Dawn Satow , brought against us in the Superior Court for Sacramento County, California in June 2017. In this case four investors in IMG seek to hold us liable for losses arising from their investments in that company, alleging that we conspired with and knowingly assisted IMG and its principal in furtherance of an alleged Ponzi scheme. This case is in an early phase with initial motion practice having been completed and discovery is underway. Trial is scheduled for February 2020. • a civil class action lawsuit, Evans v. CB&T , brought against us in the United States District Court for the Eastern District of California in May 2017. This case was filed on behalf of a class of up to 50 investors in IMG and seeks to hold us liable for losses of class members arising from their investments in IMG, alleging that we conspired with and knowingly assisted IMG and its principal in furtherance of an alleged Ponzi scheme. In December 2017, the District Court dismissed all claims against the Bank. In January 2018, the plaintiff filed an appeal with the Court of Appeals for the Ninth Circuit. The appeal was heard in early April 2019 with the Court of Appeals reversing the trial court's dismissal. It is likely that trial will not occur for a substantial period of time. • a Private Attorney General Act (“PAGA”) claim under California law, Lawson v. CB&T , brought against us in the Superior Court for the County of San Diego, California, in February 2016. In this case, the plaintiff alleges, on behalf of herself and other current or former employees of the Bank who worked in California on a non-exempt basis, violations by the Bank of California wage and hour laws. The case remains in the early stages of motion practice, to date mainly involving questions of venue and scope of employees covered by the PAGA claims. In March 2018, the Supreme Court of California granted review of an appeal from the intermediate appellate court decision requiring all aspects of the case to be heard in state court, rather than in arbitration. The appellate briefing process has been completed with a ruling anticipated in 2019. Trial has not been scheduled. • two civil cases, Lifescan Inc. and Johnson & Johnson Health Care Services v. Jeffrey Smith, et. al. , brought against us in the United States District Court for the District of New Jersey in December 2017, and Roche Diagnostics and Roche Diabetes Care Inc. v. Jeffrey C. Smith, et. al. , brought against us in the United States District Court for the District of New Jersey in March 2019. In these cases, certain manufacturers and distributors of medical products seek to hold us liable for allegedly fraudulent practices of a borrower of the Bank which filed for bankruptcy protection in 2017. The cases are in early phases, with initial motion practice and discovery underway in the Lifescan case. Trial has not been scheduled in either case. • a civil class action lawsuit, Gregory, et. al. v. Zions Bancorporation , brought against us in the United States District Court in Utah in January 2019. This case was filed on behalf of investors in Rust Rare Coin, Inc. alleging that we aided and abetted a Ponzi scheme fraud perpetrated by Rust Rare Coin, a Zions Bank customer. The case follows civil actions and the establishment of a receivership for Rust Rare Coin by The Commodities Futures Trading Commission and the Utah Division of Securities in November 2018, as well as a separate suit brought by the Securities and Exchange Commission against Rust Rare Coin and its principal, Gaylen Rust. The matter is in the early motion practice state and initial phase discovery has commenced. During the second quarter of 2019, we filed a motion to dismiss. Trial has not been scheduled. A related case, North Valley Partners et. al. vs. Zions Bancorporation, brought against us by a group of investors in Rust Rare Coin, was dismissed without prejudice in the second quarter of 2019 with those plaintiffs opting for now to participate in the Gregory class. • a civil suit, Shou-En Wang v. CB&T, brought against us in the Superior Court for Los Angeles County, Central District in April 2016 was resolved in the second quarter of 2019. The case related to deposit customers who were promoters of an investment program that allegedly misappropriated investors' funds. At least quarterly, we review outstanding and new legal matters, utilizing then available information. In accordance with applicable accounting guidance, if we determine that a loss from a matter is probable and the amount of the loss can be reasonably estimated, we establish an accrual for the loss. In the absence of such a determination, no accrual is made. Once established, accruals are adjusted to reflect developments relating to the matters. In our review, we also assess whether we can determine the range of reasonably possible losses for significant matters in which we are unable to determine that the likelihood of a loss is remote. Because of the difficulty of predicting the outcome of legal matters, discussed subsequently, we are able to meaningfully estimate such a range only for a limited number of matters. Based on information available as of June 30, 2019, we estimated that the aggregate range of reasonably possible losses for those matters to be from $0 million to roughly $45 million in excess of amounts accrued. The matters underlying the estimated range will change from time to time, and actual results may vary significantly from this estimate. Those matters for which a meaningful estimate is not possible are not included within this estimated range and, therefore, this estimated range does not represent our maximum loss exposure. Based on our current knowledge, we believe that our current estimated liability for litigation and other legal actions and claims, reflected in our accruals and determined in accordance with applicable accounting guidance, is adequate and that liabilities in excess of the amounts currently accrued, if any, arising from litigation and other legal actions and claims for which an estimate as previously described is possible, will not have a material impact on our financial condition, results of operations, or cash flows. However, in light of the significant uncertainties involved in these matters, and the very large or indeterminate damages sought in some of these matters, an adverse outcome in one or more of these matters could be material to our financial condition, results of operations, or cash flows for any given reporting period. Any estimate or determination relating to the future resolution of litigation, arbitration, governmental or self-regulatory examinations, investigations or actions or similar matters is inherently uncertain and involves significant judgment. This is particularly true in the early stages of a legal matter, when legal issues and facts have not been well articulated, reviewed, analyzed, and vetted through discovery, preparation for trial or hearings, substantive and productive mediation or settlement discussions, or other actions. It is also particularly true with respect to class action and similar claims involving multiple defendants, matters with complex procedural requirements or substantive issues or novel legal theories, and examinations, investigations and other actions conducted or brought by governmental and self-regulatory agencies, in which the normal adjudicative process is not applicable. Accordingly, we usually are unable to determine whether a favorable or unfavorable outcome is remote, reasonably likely, or probable, or to estimate the amount or range of a probable or reasonably likely loss, until relatively late in the course of a legal matter, sometimes not until a number of years have elapsed. Accordingly, our judgments and

Revenue Recognition (Notes)

Revenue Recognition (Notes) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)States	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)States	Jun. 30, 2018USD ($)
Number of States in which Entity Operates | States	11		11
Other service charges, commissions, and fees	$ 58	$ 55	$ 113	$ 110
Revenue Recognition [Member]
Interest and Fee Income, Loans, Consumer Installment, Credit Card	36	34	69	67
ATM Fees	2	3	4	5
Other Service Charges	3	4	7	7
Other Commissions and Fees	4	5	8	10
Other service charges, commissions, and fees	$ 45	$ 46	$ 88	$ 89

Retirement Plans

Retirement Plans	6 Months Ended
	Jun. 30, 2019
Defined Benefit Plan [Abstract]
Retirement Plans	RETIREMENT PLANS The following discloses the net periodic benefit cost (benefit) and its components for the Bank’s pension and other retirement plans: (In millions) Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Interest cost $ 1 $ 1 $ 3 $ 3 Expected return on plan assets (2) (3) (4) (6) Partial settlement loss — — — 1 Amortization of net actuarial loss 1 1 1 1 Net periodic cost (benefit) $ — $ (1) $ — $ (1) As disclosed in our 2018 Annual Report on Form 10-K, the Bank has frozen its participation and benefit accruals for the pension plan and its contributions for individual benefit payments in the postretirement benefit plan. In October 2018, the Bank decided to terminate its pension plan subject to obtaining necessary regulatory approval. Completion of this termination is expected in early 2020. Plan participant benefits will not be disadvantaged because of this decision.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The effective income tax rate of 22.7% for the second quarter of 2019 was higher than the 2018 second quarter rate of 22.1%. The effective tax rate for both year-to-date periods was 22.5%. The income tax rates for 2019 and 2018 were reduced by nontaxable municipal interest income and nontaxable income from certain bank-owned life insurance, and were increased by the non-deductibility of Federal Deposit Insurance Corporation (“FDIC”) premiums, certain executive compensation and other fringe benefits. We had a net deferred tax asset (“DTA”) balance of $36 million at June 30, 2019, compared with $130 million at December 31, 2018. The decrease in the net DTA resulted primarily from the decrease of accrued compensation and unrealized losses in other comprehensive income ("OCI") related to securities. A reduction of net deferred tax liabilities related to leasing operations, including deferred items associated with the adoption of ASC 842, offset some of the overall decrease in DTA.

Net Earnings per Common Share (

Net Earnings per Common Share (Note)	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	NET EARNINGS PER COMMON SHARE Basic and diluted net earnings per common share based on the weighted average outstanding shares are summarized as follows: Three Months Ended Six Months Ended (In millions, except shares and per share amounts) 2019 2018 2019 2018 Basic: Net income $ 198 $ 197 $ 411 $ 435 Less common and preferred dividends 63 57 127 104 Undistributed earnings 135 140 284 331 Less undistributed earnings applicable to nonvested shares 1 1 2 3 Undistributed earnings applicable to common shares 134 139 282 328 Distributed earnings applicable to common shares 54 47 110 86 Total earnings applicable to common shares $ 188 $ 186 $ 392 $ 414 Weighted average common shares outstanding (in thousands) 179,156 195,583 181,946 196,149 Net earnings per common share $ 1.05 $ 0.95 $ 2.15 $ 2.11 Diluted: Total earnings applicable to common shares $ 188 $ 186 $ 392 $ 414 Weighted average common shares outstanding (in thousands) 179,156 195,583 181,946 196,149 Dilutive effect of common stock warrants (in thousands) 9,318 12,640 9,587 12,627 Dilutive effect of stock options (in thousands) 624 1,024 673 1,083 Weighted average diluted common shares outstanding (in thousands) 189,098 209,247 192,206 209,859 Net earnings per common share $ 0.99 $ 0.89 $ 2.04 $ 1.97 The following schedule presents the weighted average stock awards that were anti-dilutive and not included in the calculation of diluted earnings per share. Three Months Ended Six Months Ended (In thousands) 2019 2018 2019 2018 Restricted stock and restricted stock units 1,446 1,709 1,435 1,733 Stock options 492 194 411 120

Operating Segment Information

Operating Segment Information	6 Months Ended
	Jun. 30, 2019
Operating Segment Information [Abstract]
Operating Segment Information	OPERATING SEGMENT INFORMATIONWe manage our operations and prepare management reports and other information with a primary focus on geographical area. Our banking operations are managed under their own individual brand names, including Zions Bank, Amegy Bank, California Bank & Trust, National Bank of Arizona, Nevada State Bank, Vectra Bank Colorado, and The Commerce Bank of Washington. Performance assessment and resource allocation are based upon this geographical structure. We use an internal funds transfer pricing (“FTP”) allocation system to report results of operations for business segments. This process is continually refined. Total average loans and deposits presented for the banking segments include insignificant intercompany amounts between banking segments and may also include deposits with the Other segment. As of June 30, 2019, our banking business is conducted through 7 locally managed and branded segments in distinct geographical areas. Zions Bank operates 98 branches in Utah, 24 branches in Idaho, and one branch in Wyoming. Amegy operates 74 branches in Texas. CB&T operates 87 branches in California. NBAZ operates 58 branches in Arizona. NSB operates 50 branches in Nevada. Vectra operates 36 branches in Colorado and one branch in New Mexico. TCBW operates two branches in Washington and one branch in Oregon. The operating segment identified as “Other” includes certain non-bank financial service subsidiaries, centralized back-office functions, and eliminations of transactions between segments. The major components of net interest income at the Bank’s back-office include the revenue associated with the investments securities portfolio and the offset of the FTP costs and benefits provided to the business segments. The following schedule does not present total assets or income tax expense for each operating segment, but instead presents average loans, average deposits and income before income taxes because these are the metrics that management uses when evaluating performance and making decisions pertaining to the operating segments. The Bank’s net interest income includes interest expense on borrowed funds. The condensed statement of income identifies the components of income and expense which affect the operating amounts presented in the Other segment. The accounting policies of the individual operating segments are the same as those of the Bank. Transactions between operating segments are primarily conducted at fair value, resulting in profits that are eliminated for reporting consolidated results of operations. The following schedule presents selected operating segment information for the three months ended June 30, 2019 and 2018: Zions Bank Amegy CB&T (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 179 $ 176 $ 132 $ 127 $ 140 $ 131 Provision for credit losses 16 5 (8) (6) 9 2 Net interest income after provision for loan losses 163 171 140 133 131 129 Noninterest income 39 38 34 31 22 19 Noninterest expense 120 117 86 86 82 76 Income (loss) before income taxes $ 82 $ 92 $ 88 $ 78 $ 71 $ 72 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 13,067 $ 12,633 $ 12,254 $ 11,387 $ 10,838 $ 9,908 Total average deposits 15,455 15,346 11,361 11,060 11,412 11,181 NBAZ NSB Vectra (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 62 $ 58 $ 40 $ 38 $ 36 $ 34 Provision for credit losses 2 7 — — 1 2 Net interest income after provision for loan losses 60 51 40 38 35 32 Noninterest income 11 10 11 10 6 6 Noninterest expense 38 38 37 36 27 25 Income (loss) before income taxes $ 33 $ 23 $ 14 $ 12 $ 14 $ 13 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 4,847 $ 4,640 $ 2,570 $ 2,349 $ 3,105 $ 2,881 Total average deposits 5,048 4,942 4,406 4,314 2,811 2,784 TCBW Other Consolidated Bank (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 14 $ 12 $ (34) $ (28) $ 569 $ 548 Provision for credit losses 2 1 (1) 1 21 12 Net interest income after provision for loan losses 12 11 (33) (29) 548 536 Noninterest income 1 1 8 23 132 138 Noninterest expense 5 5 29 38 424 421 Income (loss) before income taxes $ 8 $ 7 $ (54) $ (44) $ 256 $ 253 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 1,203 $ 1,117 $ 440 $ 327 $ 48,324 $ 45,242 Total average deposits 1,053 1,048 2,801 2,221 54,347 52,896 The following schedule presents selected operating segment information for the six months ended June 30, 2019 and 2018: Zions Bank Amegy CB&T (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 358 $ 342 $ 263 $ 254 $ 278 $ 262 Provision for loan losses 26 3 (23) (59) 12 5 Net interest income after provision for loan losses 332 339 286 313 266 257 Noninterest income 72 73 68 64 41 40 Noninterest expense 237 231 174 173 164 154 Income (loss) before income taxes $ 167 $ 181 $ 180 $ 204 $ 143 $ 143 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 13,004 $ 12,543 $ 12,058 $ 11,379 $ 10,707 $ 9,919 Total average deposits 15,490 15,211 11,401 10,938 11,328 11,150 NBAZ NSB Vectra (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 122 $ 111 $ 80 $ 73 $ 72 $ 66 Provision for credit losses 4 9 (1) — 5 5 Net interest income after provision for loan losses 118 102 81 73 67 61 Noninterest income 21 19 21 20 12 12 Noninterest expense 78 75 73 72 54 52 Income (loss) before income taxes $ 61 $ 46 $ 29 $ 21 $ 25 $ 21 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 4,798 $ 4,591 $ 2,535 $ 2,349 $ 3,080 $ 2,837 Total average deposits 4,972 4,863 4,368 4,269 2,816 2,748 TCBW Other Consolidated Bank (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 28 $ 24 $ (56) $ (42) $ 1,145 $ 1,090 Provision for credit losses 2 2 — — 25 (35) Net interest income after provision for loan losses 26 22 (56) (42) 1,120 1,125 Noninterest income 2 3 27 45 264 276 Noninterest expense 11 11 63 72 854 840 Income (loss) before income taxes $ 17 $ 14 $ (92) $ (69) $ 530 $ 561 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 1,156 $ 1,135 $ 412 $ 301 $ 47,750 $ 45,054 Total average deposits 1,064 1,060 2,694 2,208 54,133 52,447

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis	(In millions) June 30, 2019 Level 1 Level 2 Level 3 Total ASSETS Investment securities: Available-for-sale: 1 U.S. Treasury, agencies and corporations $ 40 $ 13,257 $ — $ 13,297 Municipal securities 1,350 1,350 Other debt securities 25 25 Total Available-for-sale 40 14,632 — 14,672 Trading account 18 130 148 Other noninterest-bearing investments: Bank-owned life insurance 522 522 Private equity investments 105 105 Other assets: Agriculture loan servicing and interest-only strips 19 19 Deferred compensation plan assets 106 106 Derivatives: Derivatives designated as hedges 26 26 Derivatives not designated as hedges: Customer-facing interest rate 139 139 Other interest rate 2 2 Foreign exchange 3 3 Total Assets $ 167 $ 15,451 $ 124 $ 15,742 LIABILITIES Securities sold, not yet purchased $ 66 $ — $ — $ 66 Other liabilities: Deferred compensation plan obligations 106 106 Derivatives: Derivatives not designated as hedges: Customer-facing interest rate 11 11 Other interest rate 1 1 Foreign exchange 2 2 Total Liabilities $ 174 $ 12 $ — $ 186 1 We used a third-party pricing service to measure fair value for approximately 94% of our AFS Level 2 securities. (In millions) December 31, 2018 Level 1 Level 2 Level 3 Total ASSETS Investment securities: Available-for-sale: 1 U.S. Treasury, agencies and corporations $ 40 $ 13,385 $ — $ 13,425 Municipal securities 1,291 1,291 Other debt securities 21 21 Total Available-for-sale 40 14,697 — 14,737 Trading account 14 92 106 Other noninterest-bearing investments: Bank-owned life insurance 516 516 Private equity investments 102 102 Other assets: Agriculture loan servicing and interest-only strips 18 18 Deferred compensation plan assets 95 95 Derivatives: Derivatives not designated as hedges: Customer-facing interest rate 40 40 Other interest rate 1 1 Foreign exchange 4 4 Total Assets $ 153 $ 15,346 $ 120 $ 15,619 LIABILITIES Securities sold, not yet purchased $ 85 $ — $ — $ 85 Other liabilities: Deferred compensation plan obligations 95 95 Derivatives: Derivatives not designated as hedges: Customer-facing interest rate 36 36 Other interest rate 1 1 Foreign exchange 2 2 Total Liabilities $ 182 $ 37 $ — $ 219 1 We used a third-party pricing service to measure fair value for approximately 95% of our AFS Level 2 securities.
Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis Using Level 3 Inputs	Level 3 Instruments Three Months Ended Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 (In millions) Private Ag loan svcg and int-only strips Private Ag loan svcg and int-only strips Private equity investments Ag loan svcg and int-only strips Private equity investments Ag loan svcg and int-only strips Balance at beginning of period $ 107 $ 17 $ 100 $ 18 $ 102 $ 18 $ 95 $ 18 Securities gains (losses), net (2) — 1 — (1) — 1 — Other noninterest income — 2 — — — 1 — — Purchases — — 1 — 4 — 6 — Balance at end of period $ 105 $ 19 $ 102 $ 18 $ 105 $ 19 $ 102 $ 18
Schedule Of Assets With Fair Value Changes On Nonrecurring Basis	(In millions) Fair value at June 30, 2019 Fair value at December 31, 2018 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total ASSETS Private equity investments $ — $ — $ — $ — $ — $ — $ 1 $ 1 Impaired loans — 6 — 6 — 32 — 32 Other real estate owned — 1 — 1 — — — — Total $ — $ 7 $ — $ 7 $ — $ 32 $ 1 $ 33 The previous fair values may not be current as of the dates indicated, but rather as of the date the fair value change occurred, such as a charge for impairment. Accordingly, carrying values may not equal current fair value. Gains (losses) from fair value changes (In millions) Three Months Ended Six Months Ended 2019 2018 2019 2018 ASSETS Private equity investments $ — $ — $ — $ — Impaired loans (9) (1) (9) (5) Other real estate owned — — — (1) Total $ (9) $ (1) $ (9) $ (6)
Fair Value, by Balance Sheet Grouping [Table Text Block]	June 30, 2019 December 31, 2018 (In millions) Carrying Estimated Level Carrying Estimated Level Financial assets: HTM investment securities $ 695 $ 698 2 $ 774 $ 767 2 Loans and leases (including loans held for sale), net of allowance 48,219 47,475 3 46,312 45,251 3 Financial liabilities: Time deposits 4,915 4,923 2 4,336 4,319 2 Long-term debt 1,236 1,248 2 724 727 2

Offsetting Assets and Liabili_2

Offsetting Assets and Liabilities (Tables)	6 Months Ended
	Jun. 30, 2019
Offsetting Assets and Liabilities [Abstract]
Offsetting Assets [Table Text Block]	June 30, 2019 (In millions) Gross amounts not offset in the balance sheet Description Gross amounts recognized Gross amounts offset in the balance sheet Net amounts presented in the balance sheet Financial instruments Cash collateral received/pledged Net amount Assets: Federal funds sold and security resell agreements $ 876 $ (256) $ 620 $ — $ — $ 620 Derivatives (included in other assets) 170 — 170 (10) (14) 146 Total assets $ 1,046 $ (256) $ 790 $ (10) $ (14) $ 766 Liabilities: Federal funds and other short-term borrowings $ 6,279 $ (256) $ 6,023 $ — $ — $ 6,023 Derivatives (included in other liabilities) 14 — 14 (10) (2) 2 Total Liabilities $ 6,293 $ (256) $ 6,037 $ (10) $ (2) $ 6,025 December 31, 2018 (In millions) Gross amounts not offset in the balance sheet Description Gross amounts recognized Gross amounts offset in the balance sheet Net amounts presented in the balance sheet Financial instruments Cash collateral received/pledged Net amount Assets: Federal funds sold and security resell agreements $ 1,461 $ — $ 1,461 $ — $ — $ 1,461 Derivatives (included in other assets) 45 — 45 (35) (3) 7 Total assets $ 1,506 $ — $ 1,506 $ (35) $ (3) $ 1,468 Liabilities: Federal funds and other short-term borrowings $ 5,653 $ — $ 5,653 $ — $ — $ 5,653 Derivatives (included in other liabilities) 39 — 39 (35) (1) 3 Total Liabilities $ 5,692 $ — $ 5,692 $ (35) $ (1) $ 5,656

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2019
Investments [Abstract]
Summary Of Investment Securities	June 30, 2019 (In millions) Amortized Gross unrealized gains Gross unrealized losses Estimated Held-to-maturity Municipal securities $ 695 $ 5 $ 2 $ 698 Available-for-sale U.S. Treasury securities 40 — — 40 U.S. Government agencies and corporations: Agency securities 1,372 6 5 1,373 Agency guaranteed mortgage-backed securities 10,110 86 63 10,133 Small Business Administration loan-backed securities 1,790 1 40 1,751 Municipal securities 1,322 28 — 1,350 Other debt securities 25 — — 25 Total available-for-sale 14,659 121 108 14,672 Total investment securities $ 15,354 $ 126 $ 110 $ 15,370 December 31, 2018 (In millions) Amortized Gross unrealized gains Gross unrealized losses Estimated Held-to-maturity Municipal securities $ 774 $ 4 $ 11 $ 767 Available-for-sale U.S. Treasury securities 40 — — 40 U.S. Government agencies and corporations: Agency securities 1,394 — 19 1,375 Agency guaranteed mortgage-backed securities 10,236 18 240 10,014 Small Business Administration loan-backed securities 2,042 1 47 1,996 Municipal securities 1,303 4 16 1,291 Other debt securities 25 — 4 21 Total available-for-sale debt securities 15,040 23 326 14,737 Total investment securities $ 15,814 $ 27 $ 337 $ 15,504
Contractual Maturities Debt Securities	June 30, 2019 Held-to-maturity Available-for-sale (In millions) Amortized Estimated Amortized Estimated Due in one year or less $ 138 $ 138 $ 177 $ 177 Due after one year through five years 258 259 633 636 Due after five years through ten years 155 158 2,824 2,835 Due after ten years 144 143 11,025 11,024 Total debt investment securities $ 695 $ 698 $ 14,659 $ 14,672
Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value	June 30, 2019 Less than 12 months 12 months or more Total (In millions) Gross Estimated Gross Estimated Gross Estimated Held-to-maturity Municipal securities $ — $ 13 $ 2 $ 275 $ 2 $ 288 Available-for-sale U.S. Government agencies and corporations: Agency securities — 14 5 606 5 620 Agency guaranteed mortgage-backed securities 1 72 62 4,535 63 4,607 Small Business Administration loan-backed securities 1 34 39 1,430 40 1,464 Municipal securities — 30 — 159 — 189 Other — — — 15 — 15 Total available-for-sale 2 150 106 6,745 108 6,895 Total investment securities $ 2 $ 163 $ 108 $ 7,020 $ 110 $ 7,183 December 31, 2018 Less than 12 months 12 months or more Total (In millions) Gross Estimated Gross Estimated Gross Estimated Held-to-maturity Municipal securities $ 1 $ 86 $ 10 $ 438 $ 11 $ 524 Available-for-sale U.S. Government agencies and corporations: Agency securities 2 245 17 913 19 1,158 Agency guaranteed mortgage-backed securities 16 1,081 224 6,661 240 7,742 Small Business Administration loan-backed securities 19 1,180 28 711 47 1,891 Municipal securities 2 266 14 641 16 907 Other — — 4 11 4 11 Total available-for-sale 39 2,772 287 8,937 326 11,709 Total investment securities $ 40 $ 2,858 $ 297 $ 9,375 $ 337 $ 12,233
Gains And Losses, Including OTTI, Recognized In Statement Of Income	Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 (In millions) Gross gains Gross losses Gross gains Gross losses Gross gains Gross losses Gross gains Gross losses Other noninterest-bearing investments $ 1 $ 4 $ 4 $ 3 $ 5 $ 7 $ 6 $ 5 Net gains (losses) 1 $ (3) $ 1 $ (2) $ 1 1 Net gains were recognized in securities gains (losses), net in the statement of income.
Tax and Nontaxable Interest Income by Investment Type [Table Text Block]	Three Months Ended June 30, 2019 2018 (In millions) Taxable Nontaxable Total Taxable Nontaxable Total Investment securities: Held-to-maturity $ 2 $ 4 $ 6 $ 3 $ 3 $ 6 Available-for-sale 81 6 87 70 7 77 Trading — 2 2 — 2 2 Total securities $ 83 $ 12 $ 95 $ 73 $ 12 $ 85 Six Months Ended June 30, 2019 2018 (In millions) Taxable Nontaxable Total Taxable Nontaxable Total Investment securities: Held-to-maturity $ 4 $ 8 $ 12 $ 5 $ 7 $ 12 Available-for-sale 164 12 176 142 13 155 Trading — 3 3 — 3 3 Total $ 168 $ 23 $ 191 $ 147 $ 23 $ 170

Loans And Allowance For Credi_2

Loans And Allowance For Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
allowance for loan losses by impairment [Table Text Block]	June 30, 2019 (In millions) Commercial Commercial Consumer Total Allowance for loan losses: Individually evaluated for impairment $ 11 $ 1 $ 2 $ 14 Collectively evaluated for impairment 327 113 49 489 Total $ 338 $ 114 $ 51 $ 503 Outstanding loan balances: Individually evaluated for impairment $ 168 $ 48 $ 69 $ 285 Collectively evaluated for impairment 24,939 11,779 11,614 48,332 Total $ 25,107 $ 11,827 $ 11,683 $ 48,617 December 31, 2018 (In millions) Commercial Commercial Consumer Total Allowance for loan losses: Individually evaluated for impairment $ 6 $ 1 $ 2 $ 9 Collectively evaluated for impairment 325 109 52 486 Total $ 331 $ 110 $ 54 $ 495 Outstanding loan balances: Individually evaluated for impairment $ 164 $ 55 $ 72 $ 291 Collectively evaluated for impairment 23,998 11,070 11,355 46,423 Total $ 24,162 $ 11,125 $ 11,427 $ 46,714
Summary Of Major Portfolio Segment And Specific Loan Class	(In millions) June 30, December 31, Loans held for sale $ 105 $ 93 Commercial: Commercial and industrial $ 14,883 $ 14,513 Leasing 337 327 Owner-occupied 7,828 7,661 Municipal 2,059 1,661 Total commercial 25,107 24,162 Commercial real estate: Construction and land development 2,609 2,186 Term 9,218 8,939 Total commercial real estate 11,827 11,125 Consumer: Home equity credit line 2,929 2,937 1-4 family residential 7,440 7,176 Construction and other consumer real estate 644 643 Bankcard and other revolving plans 502 491 Other 168 180 Total consumer 11,683 11,427 Total loans 1 $ 48,617 $ 46,714
Summary Of Changes in The Allowance For Credit Losses	Three Months Ended June 30, 2019 (In millions) Commercial Commercial Consumer Total Allowance for loan losses Balance at beginning of period $ 328 $ 113 $ 56 $ 497 Provision for loan losses 23 1 (4) 20 Deductions: Gross loan and lease charge-offs 19 — 4 23 Recoveries 6 — 3 9 Net loan and lease charge-offs (recoveries) 13 — 1 14 Balance at end of period $ 338 $ 114 $ 51 $ 503 Reserve for unfunded lending commitments Balance at beginning of period $ 42 $ 17 $ — $ 59 Provision for unfunded lending commitments (1) 2 — 1 Balance at end of period $ 41 $ 19 $ — $ 60 Total allowance for credit losses at end of period Allowance for loan losses $ 338 $ 114 $ 51 $ 503 Reserve for unfunded lending commitments 41 19 — 60 Total allowance for credit losses $ 379 $ 133 $ 51 $ 563 Six Months Ended June 30, 2019 (In millions) Commercial Commercial Consumer Total Allowance for loan losses Balance at beginning of period $ 331 $ 110 $ 54 $ 495 Provision for loan losses 22 2 (2) 22 Deductions: Gross loan and lease charge-offs 27 1 7 35 Recoveries 12 3 6 21 Net loan and lease charge-offs (recoveries) 15 (2) 1 14 Balance at end of period $ 338 $ 114 $ 51 $ 503 Reserve for unfunded lending commitments Balance at beginning of period $ 40 $ 17 $ — $ 57 Provision for unfunded lending commitments 1 2 — 3 Balance at end of period $ 41 $ 19 $ — $ 60 Total allowance for credit losses at end of period Allowance for loan losses $ 338 $ 114 $ 51 $ 503 Reserve for unfunded lending commitments 41 19 — 60 Total allowance for credit losses $ 379 $ 133 $ 51 $ 563 Three Months Ended June 30, 2018 (In millions) Commercial Commercial Consumer Total Allowance for loan losses Balance at beginning of period $ 329 $ 104 $ 40 $ 473 Provision for loan losses (18) 15 8 5 Gross loan and lease charge-offs 10 — 3 13 Recoveries 20 3 2 25 Net loan and lease charge-offs (recoveries) (10) (3) 1 (12) Balance at end of period $ 321 $ 122 $ 47 $ 490 Reserve for unfunded lending commitments Balance at beginning of period $ 40 $ 11 $ — $ 51 Provision for unfunded lending commitments 3 4 — 7 Balance at end of period $ 43 $ 15 $ — $ 58 Total allowance for credit losses at end of period Allowance for loan losses $ 321 $ 122 $ 47 $ 490 Reserve for unfunded lending commitments 43 15 — 58 Total allowance for credit losses $ 364 $ 137 $ 47 $ 548 Six Months Ended June 30, 2018 (In millions) Commercial Commercial Consumer Total Allowance for loan losses Balance at beginning of period $ 371 $ 103 $ 44 $ 518 Provision for loan losses (58) 14 9 (35) Gross loan and lease charge-offs 30 — 9 39 Recoveries 38 5 3 46 Net loan and lease charge-offs (recoveries) (8) (5) 6 (7) Balance at end of period $ 321 $ 122 $ 47 $ 490 Reserve for unfunded lending commitments Balance at beginning of period $ 48 $ 10 $ — $ 58 Provision for unfunded lending commitments (5) 5 — — Balance at end of period $ 43 $ 15 $ — $ 58 Total allowance for credit losses at end of period Allowance for loan losses $ 321 $ 122 $ 47 $ 490 Reserve for unfunded lending commitments 43 15 — 58 Total allowance for credit losses $ 364 $ 137 $ 47 $ 548
Summary Of Nonaccrual Loans	(In millions) June 30, December 31, Loans held for sale $ — $ 6 Commercial: Commercial and industrial $ 85 $ 82 Leasing 1 2 Owner-occupied 69 67 Municipal 1 1 Total commercial 156 152 Commercial real estate: Construction and land development 1 — Term 31 38 Total commercial real estate 32 38 Consumer: Home equity credit line 12 13 1-4 family residential 44 42 Construction and other consumer real estate 4 — Bankcard and other revolving plans — 1 Other — — Total consumer loans 60 56 Total $ 248 $ 246
Summary Of Past Due Loans (Accruing And Nonaccruing)	June 30, 2019 (In millions) Current 30-89 days 90+ days Total Total Accruing Nonaccrual loans that are current 1 Loans held for sale $ 105 $ — $ — $ — $ 105 $ — $ — Commercial: Commercial and industrial $ 14,820 $ 37 $ 26 $ 63 $ 14,883 $ 4 $ 53 Leasing 337 — — — 337 — 1 Owner-occupied 7,771 32 25 57 7,828 6 47 Municipal 2,058 — 1 1 2,059 — — Total commercial 24,986 69 52 121 25,107 10 101 Commercial real estate: Construction and land development 2,580 23 6 29 2,609 5 — Term 9,202 10 6 16 9,218 — 24 Total commercial real estate 11,782 33 12 45 11,827 5 24 Consumer: Home equity credit line 2,919 6 4 10 2,929 — 6 1-4 family residential 7,411 8 21 29 7,440 — 17 Construction and other consumer real estate 640 1 3 4 644 — — Bankcard and other revolving plans 497 3 2 5 502 2 — Other 167 1 — 1 168 — — Total consumer loans 11,634 19 30 49 11,683 2 23 Total $ 48,402 $ 121 $ 94 $ 215 $ 48,617 $ 17 $ 148 December 31, 2018 (In millions) Current 30-89 days 90+ days Total Total Accruing Nonaccrual loans that are current 1 Loans held for sale $ 89 $ — $ 4 $ 4 $ 93 $ — $ 2 Commercial: Commercial and industrial $ 14,445 $ 37 $ 31 $ 68 $ 14,513 $ 4 $ 46 Leasing 325 1 1 2 327 — 1 Owner-occupied 7,621 23 17 40 7,661 3 48 Municipal 1,661 — — — 1,661 — 1 Total commercial 24,052 61 49 110 24,162 7 96 Commercial real estate: Construction and land development 2,185 1 — 1 2,186 — — Term 8,924 4 11 15 8,939 1 26 Total commercial real estate 11,109 5 11 16 11,125 1 26 Consumer: Home equity credit line 2,927 4 6 10 2,937 — 4 1-4 family residential 7,143 15 18 33 7,176 — 19 Construction and other consumer real estate 642 1 — 1 643 — — Bankcard and other revolving plans 487 2 2 4 491 2 — Other 179 1 — 1 180 — — Total consumer loans 11,378 23 26 49 11,427 2 23 Total $ 46,539 $ 89 $ 86 $ 175 $ 46,714 $ 10 $ 145 1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.
Summary Of Outstanding Loan Balances (Accruing And Nonaccruing) Categorized By Credit Quality Indicators	June 30, 2019 (In millions) Pass Special Sub- Doubtful Total Total Commercial: Commercial and industrial $ 14,247 $ 273 $ 363 $ — $ 14,883 Leasing 321 11 5 — 337 Owner-occupied 7,524 77 227 — 7,828 Municipal 2,032 — 27 — 2,059 Total commercial 24,124 361 622 — 25,107 $ 338 Commercial real estate: Construction and land development 2,586 16 7 — 2,609 Term 9,111 39 68 — 9,218 Total commercial real estate 11,697 55 75 — 11,827 114 Consumer: Home equity credit line 2,913 — 16 — 2,929 1-4 family residential 7,391 — 49 — 7,440 Construction and other consumer real estate 639 — 5 — 644 Bankcard and other revolving plans 499 — 3 — 502 Other 168 — — — 168 Total consumer loans 11,610 — 73 — 11,683 51 Total $ 47,431 $ 416 $ 770 $ — $ 48,617 $ 503 December 31, 2018 (In millions) Pass Special Sub- Doubtful Total Total Commercial: Commercial and industrial $ 13,891 $ 322 $ 300 $ — $ 14,513 Leasing 313 10 4 — 327 Owner-occupied 7,369 72 220 — 7,661 Municipal 1,632 2 27 — 1,661 Total commercial 23,205 406 551 — 24,162 $ 331 Commercial real estate: Construction and land development 2,174 11 1 — 2,186 Term 8,853 10 76 — 8,939 Total commercial real estate 11,027 21 77 — 11,125 110 Consumer: Home equity credit line 2,920 — 17 — 2,937 1-4 family residential 7,129 — 47 — 7,176 Construction and other consumer real estate 641 — 2 — 643 Bankcard and other revolving plans 488 — 3 — 491 Other 179 — 1 — 180 Total consumer loans 11,357 — 70 — 11,427 54 Total $ 45,589 $ 427 $ 698 $ — $ 46,714 $ 495
Summary Of Information On Impaired Loans	June 30, 2019 (In millions) Unpaid Recorded investment Total Related with no with Commercial: Commercial and industrial $ 129 $ 36 $ 62 $ 98 $ 10 Owner-occupied 63 44 11 55 1 Municipal 1 1 — 1 — Total commercial 193 81 73 154 11 Commercial real estate: Construction and land development — — — — — Term 38 32 2 34 — Total commercial real estate 38 32 2 34 — Consumer: Home equity credit line 15 12 2 14 — 1-4 family residential 60 29 23 52 2 Construction and other consumer real estate 3 1 2 3 — Other — — — — — Total consumer loans 78 42 27 69 2 Total $ 309 $ 155 $ 102 $ 257 $ 13 December 31, 2018 (In millions) Unpaid Recorded investment Total Related with no with Commercial: Commercial and industrial $ 112 $ 52 $ 36 $ 88 $ 4 Owner-occupied 67 31 29 60 2 Municipal 1 1 — 1 — Total commercial 180 84 65 149 6 Commercial real estate: Construction and land development 1 — — — — Term 44 37 3 40 — Total commercial real estate 45 37 3 40 — Consumer: Home equity credit line 15 12 2 14 — 1-4 family residential 69 32 25 57 2 Construction and other consumer real estate 1 1 — 1 — Other — — — — — Total consumer loans 85 45 27 72 2 Total $ 310 $ 166 $ 95 $ 261 $ 8 Three Months Ended Six Months Ended (In millions) Average Interest Average Interest Commercial: Commercial and industrial $ 108 $ 1 $ 96 $ 2 Owner-occupied 59 — 60 — Municipal 1 — 1 — Total commercial 168 1 157 2 Commercial real estate: Construction and land development — — — — Term 39 — 37 — Total commercial real estate 39 — 37 — Consumer: Home equity credit line 14 — 14 — 1-4 family residential 55 — 55 — Construction and other consumer real estate 3 — 2 — Other — — — — Total consumer loans 72 — 71 — Total $ 279 $ 1 $ 265 $ 2 Three Months Ended Six Months Ended (In millions) Average Interest Average Interest Commercial: Commercial and industrial $ 138 $ — $ 126 $ — Owner-occupied 54 — 55 8 Municipal 1 — 1 — Total commercial 193 — 182 8 Commercial real estate: Construction and land development 5 — 5 — Term 58 — 53 — Total commercial real estate 63 — 58 — Consumer: Home equity credit line 15 — 14 — 1-4 family residential 57 — 55 — Construction and other consumer real estate 2 — 1 — Other — — — — Total consumer loans 74 — 70 — Total $ 330 $ — $ 310 $ 8
Financing Receivable, Troubled Debt Restructuring [Table Text Block]	June 30, 2019 Recorded investment resulting from the following modification types: (In millions) Interest Maturity Principal Payment Other 1 Multiple modification types 2 Total Accruing Commercial: Commercial and industrial $ 2 $ 4 $ — $ — $ 14 $ 9 $ 29 Owner-occupied 4 1 — — 3 6 14 Municipal — — — — — — — Total commercial 6 5 — — 17 15 43 Commercial real estate: Construction and land development — — — — — — — Term 1 2 — 1 — 4 8 Total commercial real estate 1 2 — 1 — 4 8 Consumer: Home equity credit line — 2 7 — — 3 12 1-4 family residential 1 1 6 — 1 24 33 Construction and other consumer real estate — 1 — — — — 1 Total consumer loans 1 4 13 — 1 27 46 Total accruing 8 11 13 1 18 46 97 Nonaccruing Commercial: Commercial and industrial 1 5 — 1 1 26 34 Owner-occupied 6 1 — — 1 6 14 Municipal — — — — — 1 1 Total commercial 7 6 — 1 2 33 49 Commercial real estate: Term 3 — — 2 3 11 19 Total commercial real estate 3 — — 2 3 11 19 Consumer: Home equity credit line — — 1 — — 1 2 1-4 family residential — — 1 1 1 6 9 Total consumer loans — — 2 1 1 7 11 Total nonaccruing 10 6 2 4 6 51 79 Total $ 18 $ 17 $ 15 $ 5 $ 24 $ 97 $ 176 1 Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc. 2 Includes TDRs that resulted from a combination of any of the previous modification types. December 31, 2018 Recorded investment resulting from the following modification types: (In millions) Interest Maturity Principal Payment Other 1 Multiple modification types 2 Total Accruing Commercial: Commercial and industrial $ 2 $ 4 $ — $ — $ 15 $ 7 $ 28 Owner-occupied 3 2 — — 2 14 21 Total commercial 5 6 — — 17 21 49 Commercial real estate: Construction and land development — — — — — — — Term 2 2 — 1 — 6 11 Total commercial real estate 2 2 — 1 — 6 11 Consumer: Home equity credit line — 1 8 — — 3 12 1-4 family residential 1 2 6 1 1 28 39 Construction and other consumer real estate — — — — — 1 1 Total consumer loans 1 3 14 1 1 32 52 Total accruing 8 11 14 2 18 59 112 Nonaccruing Commercial: Commercial and industrial 1 6 — 1 10 27 45 Owner-occupied 6 — — 1 2 5 14 Municipal — — — — — 1 1 Total commercial 7 6 — 2 12 33 60 Commercial real estate: Term 3 — — 2 14 1 20 Total commercial real estate 3 — — 2 14 1 20 Consumer: Home equity credit line — — 1 — — — 1 1-4 family residential — — 1 — 1 7 9 Total consumer loans — — 2 — 1 7 10 Total nonaccruing 10 6 2 4 27 41 90 Total $ 18 $ 17 $ 16 $ 6 $ 45 $ 100 $ 202 1 Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc. 2 Includes TDRs that resulted from a combination of any of the previous modification types.	Three Months Ended Six Months Ended (In millions) Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial: Commercial and industrial $ — $ 3 $ 3 $ — $ 6 $ 6 Owner-occupied — — — — — — Total commercial — 3 3 — 6 6 Commercial real estate: Term — — — — 1 1 Consumer: 1-4 family residential — 1 1 — 1 1 Total $ — $ 4 $ 4 $ — $ 8 $ 8 Three Months Ended Six Months Ended (In millions) Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial: Commercial and industrial $ — $ 5 $ 5 $ — $ 5 $ 5 Owner-occupied — — — — 1 1 Total commercial — 5 5 — 6 6 Commercial real estate: Term — 2 2 — 2 2 Consumer: 1-4 family residential — 1 1 — 1 1 Total $ — $ 8 $ 8 $ — $ 9 $ 9 Note: Total loans modified as TDRs during the 12 months previous to June 30, 2019 and 2018 were $69 million and $73 million, respectively.

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2019
Summary of Derivative Instruments [Abstract]
Schedule of Derivative Instruments	June 30, 2019 December 31, 2018 Notional Fair value Notional Fair value (In millions) Other Other Other Other Derivatives designated as hedging instruments: Cash flow hedges: Purchased interest rate floors $ 3,500 $ 26 $ — $ — $ — $ — Received-fixed interest rate swaps 1,663 — — 687 — — Fair value hedges: Received-fixed interest rate swaps 1,000 — — 500 — — Total derivatives designated as hedging instruments 6,163 26 — 1,187 — — Derivatives not designated as hedging instruments: Customer-facing interest rate derivatives 1, 2 3,410 138 3 2,826 37 33 Offsetting interest rate derivatives 2 3,451 3 149 2,826 33 40 Other interest rate derivatives 570 2 1 300 1 1 Foreign exchange derivatives 366 3 2 389 4 2 Total derivatives not designated as hedging instruments 7,797 146 155 6,341 75 76 Total derivatives $ 13,960 $ 172 $ 155 $ 7,528 $ 75 $ 76 1 Customer-facing interest rate derivatives in an asset position include an $11 million and $3 million credit valuation adjustment reducing the fair value as of June 30, 2019 and December 31, 2018, respectively. 2 The fair value amounts for these derivatives do not include the settlement amounts for those trades that are cleared. Once the settlement amounts with the clearing houses are included the derivative fair values would be the following: June 30, 2019 December 31, 2018 (In millions) Other assets Other liabilities Other assets Other liabilities Customer-facing interest rate derivatives $ 136 $ 3 $ 7 $ 33 Offsetting interest rate derivatives 3 8 33 3 Amount of derivative gain (loss) recognized/reclassified Three Months Ended June 30, 2019 (In millions) Effective Portion of Derivatives Gain/(Loss) Deferred in OCI Excluded Components Deferred in OCI (Amortization Approach) Amount of Gain/(Loss) Reclassified From OCI into Income Other Noninterest Income/(Expense) Hedge Ineffectiveness / OCI Reclass due to Missed Forecast Derivatives designated as hedging instruments: Cash flow hedges of floating-rate assets 1 : Purchased interest rate floors $ 2 $ 15 $ (1) $ — $ — Interest rate swaps 24 — (1) — — Fair value hedges of fixed-rate debt: Receive-fixed interest rate swaps — — — — — Total derivatives designated as hedging instruments 26 15 (2) — — Derivatives not designated as hedging instruments: Customer-facing interest rate derivatives 86 Offsetting interest rate derivatives (85) Other interest rate derivatives (1) Foreign exchange derivatives 6 Total derivatives not designated as hedging instruments 6 Total derivatives $ 26 $ 15 $ (2) $ 6 $ — Amount of derivative gain (loss) recognized/reclassified Six Months Ended June 30, 2019 (In millions) Effective Portion of Derivatives Gain/(Loss) Deferred in OCI Excluded Components Deferred in OCI (Amortization Approach) Amount of Gain/(Loss) Reclassified From OCI into Income Other Noninterest Income/(Expense) Hedge Ineffectiveness / OCI Reclass due to Missed Forecast Derivatives designated as hedging instruments: Cash flow hedges of floating-rate assets 1 : Purchased interest rate floors $ 2 $ 18 $ (1) $ — $ — Interest rate swaps 33 — (3) — — Fair value hedges of fixed-rate debt: Receive-fixed interest rate swaps — — — — — Total derivatives designated as hedging instruments 35 18 (4) — — Derivatives not designated as hedging instruments: Customer-facing interest rate derivatives 132 Offsetting interest rate derivatives (130) Other interest rate derivatives (1) Foreign exchange derivatives 11 Total derivatives not designated as hedging instruments 12 Total derivatives $ 35 $ 18 $ (4) $ 12 $ — Amount of derivative gain (loss) recognized/reclassified Three Months Ended June 30, 2018 (In millions) Effective Portion of Derivatives Gain/(Loss) Deferred in OCI Excluded Components Deferred in OCI (Amortization Approach) Amount of Gain/(Loss) Reclassified From OCI into Income Other Noninterest Income/(Expense) Hedge Ineffectiveness / OCI Reclass due to Missed Forecast Derivatives designated as hedging instruments: Cash flow hedges of floating-rate assets 1 : Purchased interest rate floors $ — $ — $ — $ — $ — Interest rate swaps (2) — (1) — — Fair value hedges of fixed-rate debt: Receive-fixed interest rate swaps — — — — — Total derivatives designated as hedging instruments (2) — (1) — — Derivatives not designated as hedging instruments: Customer-facing interest rate derivatives (14) Offsetting interest rate derivatives 18 Other interest rate derivatives — Foreign exchange derivatives 5 Total derivatives not designated as hedging instruments 9 Total derivatives $ (2) $ — $ (1) $ 9 $ — Amount of derivative gain (loss) recognized/reclassified Six Months Ended June 30, 2018 (In millions) Effective Portion of Derivatives Gain/(Loss) Deferred in OCI Excluded Components Deferred in OCI (Amortization Approach) Amount of Gain/(Loss) Reclassified From OCI into Income Other Noninterest Income/(Expense) Hedge Ineffectiveness / OCI Reclass due to Missed Forecast Derivatives designated as hedging instruments: Cash flow hedges of floating-rate assets 1 : Purchased interest rate floors $ — $ — $ — $ — $ — Interest rate swaps (7) — (2) — — Fair value hedges of fixed-rate debt: Receive-fixed interest rate swaps — — — — — Total derivatives designated as hedging instruments (7) — (2) — — Derivatives not designated as hedging instruments: Customer-facing interest rate derivatives (43) Offsetting interest rate derivatives 57 Other interest rate derivatives — Foreign exchange derivatives 10 Total derivatives not designated as hedging instruments 24 Total derivatives $ (7) $ — $ (2) $ 24 $ —
Schedule Of Gain (Loss) Of Derivative Instruments	Amount of derivative gain (loss) recognized/reclassified Three Months Ended June 30, 2019 (In millions) Effective Portion of Derivatives Gain/(Loss) Deferred in OCI Excluded Components Deferred in OCI (Amortization Approach) Amount of Gain/(Loss) Reclassified From OCI into Income Other Noninterest Income/(Expense) Hedge Ineffectiveness / OCI Reclass due to Missed Forecast Derivatives designated as hedging instruments: Cash flow hedges of floating-rate assets 1 : Purchased interest rate floors $ 2 $ 15 $ (1) $ — $ — Interest rate swaps 24 — (1) — — Fair value hedges of fixed-rate debt: Receive-fixed interest rate swaps — — — — — Total derivatives designated as hedging instruments 26 15 (2) — — Derivatives not designated as hedging instruments: Customer-facing interest rate derivatives 86 Offsetting interest rate derivatives (85) Other interest rate derivatives (1) Foreign exchange derivatives 6 Total derivatives not designated as hedging instruments 6 Total derivatives $ 26 $ 15 $ (2) $ 6 $ — Amount of derivative gain (loss) recognized/reclassified Six Months Ended June 30, 2019 (In millions) Effective Portion of Derivatives Gain/(Loss) Deferred in OCI Excluded Components Deferred in OCI (Amortization Approach) Amount of Gain/(Loss) Reclassified From OCI into Income Other Noninterest Income/(Expense) Hedge Ineffectiveness / OCI Reclass due to Missed Forecast Derivatives designated as hedging instruments: Cash flow hedges of floating-rate assets 1 : Purchased interest rate floors $ 2 $ 18 $ (1) $ — $ — Interest rate swaps 33 — (3) — — Fair value hedges of fixed-rate debt: Receive-fixed interest rate swaps — — — — — Total derivatives designated as hedging instruments 35 18 (4) — — Derivatives not designated as hedging instruments: Customer-facing interest rate derivatives 132 Offsetting interest rate derivatives (130) Other interest rate derivatives (1) Foreign exchange derivatives 11 Total derivatives not designated as hedging instruments 12 Total derivatives $ 35 $ 18 $ (4) $ 12 $ — Amount of derivative gain (loss) recognized/reclassified Three Months Ended June 30, 2018 (In millions) Effective Portion of Derivatives Gain/(Loss) Deferred in OCI Excluded Components Deferred in OCI (Amortization Approach) Amount of Gain/(Loss) Reclassified From OCI into Income Other Noninterest Income/(Expense) Hedge Ineffectiveness / OCI Reclass due to Missed Forecast Derivatives designated as hedging instruments: Cash flow hedges of floating-rate assets 1 : Purchased interest rate floors $ — $ — $ — $ — $ — Interest rate swaps (2) — (1) — — Fair value hedges of fixed-rate debt: Receive-fixed interest rate swaps — — — — — Total derivatives designated as hedging instruments (2) — (1) — — Derivatives not designated as hedging instruments: Customer-facing interest rate derivatives (14) Offsetting interest rate derivatives 18 Other interest rate derivatives — Foreign exchange derivatives 5 Total derivatives not designated as hedging instruments 9 Total derivatives $ (2) $ — $ (1) $ 9 $ — Amount of derivative gain (loss) recognized/reclassified Six Months Ended June 30, 2018 (In millions) Effective Portion of Derivatives Gain/(Loss) Deferred in OCI Excluded Components Deferred in OCI (Amortization Approach) Amount of Gain/(Loss) Reclassified From OCI into Income Other Noninterest Income/(Expense) Hedge Ineffectiveness / OCI Reclass due to Missed Forecast Derivatives designated as hedging instruments: Cash flow hedges of floating-rate assets 1 : Purchased interest rate floors $ — $ — $ — $ — $ — Interest rate swaps (7) — (2) — — Fair value hedges of fixed-rate debt: Receive-fixed interest rate swaps — — — — — Total derivatives designated as hedging instruments (7) — (2) — — Derivatives not designated as hedging instruments: Customer-facing interest rate derivatives (43) Offsetting interest rate derivatives 57 Other interest rate derivatives — Foreign exchange derivatives 10 Total derivatives not designated as hedging instruments 24 Total derivatives $ (7) $ — $ (2) $ 24 $ — Note: These schedules are not intended to present at any given time the Bank’s long/short position with respect to its derivative contracts. 1 Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). For the 12 months following June 30, 2019, we estimate that $2 million will be reclassified from AOCI into interest income
Schedule of Derivative Instruments	Gain/(loss) recorded in income Three Months Ended June 30, 2019 Three Months Ended June 30, 2018 (In millions) Derivatives 2 Hedged items Total income statement impact Derivatives 2 Hedged items Total income statement impact Interest rate swaps 1 $ 12 $ (12) $ — $ — $ — $ — Gain/(loss) recorded in income Six Months Ended June 30, 2019 Six Months Ended June 30, 2018 (In millions) Derivatives 2 Hedged items Total income statement impact Derivatives 2 Hedged items Total income statement impact Interest rate swaps 1 $ 18 $ (18) $ — $ — $ — $ — 1 Consists of hedges of benchmark interest rate risk of fixed-rate long-term debt. Gains and losses were recorded in net interest income. 2 The income for derivatives does not reflect interest income/expense to be consistent with the presentation of the gains/ (losses) on the hedged items.
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	Carrying amount of the hedged assets/(liabilities) Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities) (In millions) June 30, 2019 December 31, 2018 June 30, 2019 December 31, 2018 Long-term debt $ (1,022) $ (505) $ (22) $ (5)

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Lessee, Operating Lease, Disclosure	(Dollar amounts in millions) June 30, Operating assets and liabilities Operating right-of-use assets, net of amortization $ 232 Operating lease liabilities 251 Weighted average remaining lease term (years) Operating leases 9.3 Finance leases 0.9 Weighted average discount rate Operating leases 3.2 % Finance leases 12.6 %
Lease, Cost [Table Text Block]	(In millions) Three Months Ended Six Months Ended June 30, 2019 Operating lease costs $ 12 $ 24 Variable lease costs 13 26 Total lease cost $ 25 $ 50
Supplemental Cash Flow, Lease Related	(In millions) Three Months Ended Six Months Ended June 30, 2019 Cash paid for amounts in the measurement of lease liabilities: Operating cash disbursements from operating leases $ 12 $ 24
Finance Lease, Liability, Maturity [Table Text Block]	(In millions) 2019 1 $ 32 2020 47 2021 42 2022 37 2023 31 Thereafter 116 Total $ 305 1 Contractual maturities for the six months remaining in 2019.

Debt and Long-Term Debt (Tables

Debt and Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2019
Table Text Block [Abstract]
Schedule of Long-term Debt Instruments [Table Text Block]	Long-term debt is summarized as follows: (In millions) June 30, December 31, 2018 Subordinated notes $ 87 $ 87 Senior notes 1,149 637 Total $ 1,236 $ 724
Schedule Of Changes In Accumulated Other Comprehensive Income (Loss)	(In millions) Net unrealized gains (losses) on investment securities Net unrealized gains (losses) on derivatives and other Pension and post-retirement Total Six Months Ended June 30, 2019 Balance at December 31, 2018 $ (228) $ (1) $ (21) $ (250) OCI before reclassifications, net of tax 237 36 — 273 Amounts reclassified from AOCI, net of tax — 2 — 2 OCI 237 38 — 275 Balance at June 30, 2019 $ 9 $ 37 $ (21) $ 25 Income tax expense included in OCI $ 78 $ 12 $ — $ 90 Six Months Ended June 30, 2018 Balance at December 31, 2017 $ (114) $ (2) $ (23) $ (139) OCI (loss) before reclassifications, net of tax (175) (2) — (177) Amounts reclassified from AOCI, net of tax — 1 — 1 OCI (loss) (175) (1) — (176) Balance at June 30, 2018 $ (289) $ (3) $ (23) $ (315) Income tax benefit included in OCI $ (58) $ — $ — $ (58)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	Amounts reclassified from AOCI 1 Amounts reclassified from AOCI 1 Statement of income (SI) (In millions) Three Months Ended Six Months Ended Details about AOCI components 2019 2018 2019 2018 Affected line item Net unrealized losses on derivative instruments $ (2) $ (1) $ (4) $ (2) SI Interest and fees on loans Income tax benefit (1) — (2) (1) Amounts Reclassified from AOCI (1) (1) (2) (1) 1 Negative reclassification amounts indicate decreases to earnings in the statement of income.

Commitments, Guarantees, And _2

Commitments, Guarantees, And Contingent Liabilities (Tables)	6 Months Ended
	Jun. 30, 2019
Guarantees, Commitments And Contingencies [Abstract]
Schedule Of Guarantees Issued	(In millions) June 30, December 31, Net unfunded commitments to extend credit 1 $ 22,529 $ 21,454 Standby letters of credit: Financial 527 655 Performance 189 199 Commercial letters of credit 19 18 Total unfunded lending commitments $ 23,264 $ 22,326 1 Net of participations

Revenue Recognition (Tables)

Revenue Recognition (Tables) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	$ 41	$ 42	$ 81	$ 84
Noninterest income, Customer-related Fees	130	125	250	247
Noninterest Income	132	138	264	276
Other service charges, commissions, and fees	58	55	113	110
Wealth Management and Trust Income	13	14	26	25
Capital Market and Foreign Exchange Gain (Loss)	9	7	16	15
Net interest income	569	548	$ 1,145	1,090
Revenue Recognition, Services, Commissions [Policy Text Block]			Three Months Ended Six Months Ended (In millions) 2019 2018 2019 2018 Card fee income $ 36 $ 34 $ 69 $ 67 ATM fees 2 3 4 5 Other service charges 3 4 7 7 Other commissions and fees 4 5 8 10 Total $ 45 $ 46 $ 88 $ 89
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]			Zions Bank Amegy CB&T (In millions) 2019 2018 2019 2018 2019 2018 Service charges and fees on deposit accounts $ 14 $ 15 $ 11 $ 11 $ 7 $ 7 Other service charges, commissions, and fees 18 18 9 9 7 6 Wealth management and trust income 4 4 3 3 1 1 Capital markets and foreign exchange 2 1 (2) (1) 1 1 Total noninterest income from contracts with customers (ASC 606) 38 38 21 22 16 15 Other noninterest income (Non-ASC 606 customer related) 1 — 13 9 6 4 Total customer-related fees 39 38 34 31 22 19 Other noninterest income (non-customer related) — — — — — — Total noninterest income 39 38 34 31 22 19 Other real estate owned gain from sale — — — — — — Net interest income 179 176 132 127 140 131 Total income less interest expense $ 218 $ 214 $ 166 $ 158 $ 162 $ 150 NBAZ NSB Vectra (In millions) 2019 2018 2019 2018 2019 2018 Service charges and fees on deposit accounts $ 3 $ 3 $ 4 $ 4 $ 2 $ 2 Other service charges, commissions, and fees 3 3 3 3 2 2 Wealth management and trust income — — 1 1 — — Capital markets and foreign exchange — — — — — — Total noninterest income from contracts with customers (ASC 606) 6 6 8 8 4 4 Other noninterest income (Non-ASC 606 customer related) 4 3 3 2 2 2 Total customer-related fees 10 9 11 10 6 6 Other noninterest income (non-customer related) 1 1 — — — — Total noninterest income 11 10 11 10 6 6 Other real estate owned gain from sale — — — — — — Net interest income 62 58 40 38 36 34 Total income less interest expense $ 73 $ 68 $ 51 $ 48 $ 42 $ 40 TCBW Other Consolidated Bank (In millions) 2019 2018 2019 2018 2019 2018 Service charges and fees on deposit accounts $ — $ — $ — $ — $ 41 $ 42 Other service charges, commissions, and fees 1 1 3 4 46 46 Wealth management and trust income — — 4 4 13 13 Capital markets and foreign exchange — — 1 2 2 3 Total noninterest income from contracts with customers (ASC 606) 1 1 8 10 102 104 Other noninterest income (Non-ASC 606 customer related) — — (1) 1 28 21 Total customer-related fees 1 1 7 11 130 125 Other noninterest income (non-customer related) — — 1 12 2 13 Total noninterest income 1 1 8 23 132 138 Other real estate owned gain from sale — — — — — — Net interest income 14 12 (34) (28) 569 548 Total income less interest expense $ 15 $ 13 $ (26) $ (5) $ 701 $ 686 The following schedule sets forth the noninterest income and net revenue by operating segments for the six months ended June 30, 2019 and 2018: Zions Bank Amegy CB&T (In millions) 2019 2018 2019 2018 2019 2018 Service charges and fees on deposit accounts $ 27 $ 29 $ 22 $ 22 $ 14 $ 14 Other service charges, commissions, and fees 36 35 18 19 13 12 Wealth management and trust income 8 7 5 5 2 2 Capital markets and foreign exchange 3 3 (3) (3) 2 2 Other noninterest income from contracts with customers — — — — — — Total noninterest income from contracts with customers (ASC 606) 74 74 42 43 31 30 Other noninterest income (Non-ASC 606 customer related) (2) (1) 26 21 10 8 Total customer-related fees 72 73 68 64 41 38 Other noninterest income (non-customer related) — — — — — 2 Total noninterest income 72 73 68 64 41 40 Other real estate owned gain from sale 1 — — — — — Net interest income 358 342 263 254 278 262 Total income less interest expense $ 431 $ 415 $ 331 $ 318 $ 319 $ 302 NBAZ NSB Vectra (In millions) 2019 2018 2019 2018 2019 2018 Service charges and fees on deposit accounts $ 6 $ 6 $ 7 $ 8 $ 4 $ 4 Other service charges, commissions, and fees 6 6 6 6 3 3 Wealth management and trust income 1 1 2 2 1 1 Capital markets and foreign exchange — — 1 — — — Other noninterest income from contracts with customers — — — — — — Total noninterest income from contracts with customers (ASC 606) 13 13 16 16 8 8 Other noninterest income (Non-ASC 606 customer related) 6 4 5 4 4 4 Total customer-related fees 19 17 21 20 12 12 Other noninterest income (non-customer related) 2 2 — — — — Total noninterest income 21 19 21 20 12 12 Other real estate owned gain from sale — — — — — — Net interest income 122 111 80 73 72 66 Total income less interest expense $ 143 $ 130 $ 101 $ 93 $ 84 $ 78 TCBW Other Consolidated Bank (In millions) 2019 2018 2019 2018 2019 2018 Service charges and fees on deposit accounts $ 1 $ 1 $ — $ — $ 81 $ 84 Other service charges, commissions, and fees 1 1 5 7 88 89 Wealth management and trust income — — 7 7 26 25 Capital markets and foreign exchange — — 2 4 5 6 Other noninterest income from contracts with customers — — 1 1 1 1 Total noninterest income from contracts with customers (ASC 606) 2 2 15 19 201 205 Other noninterest income (Non-ASC 606 customer related) — 1 — 1 49 42 Total customer-related fees 2 3 15 20 250 247 Other noninterest income (non-customer related) — — 12 25 14 29 Total noninterest income 2 3 27 45 264 276 Other real estate owned gain from sale — — 1 1 2 1 Net interest income 28 24 (56) (42) 1,145 1,090 Total income less interest expense $ 30 $ 27 $ (28) $ 4 $ 1,411 $ 1,367
Zions Bank [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	14	15	$ 27	29
Noninterest income, Customer-related Fees	39	38	72	73
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	39	38	72	73
Gains (Losses) on Sales of Other Real Estate	0	0	1	0
Other service charges, commissions, and fees	18	18	36	35
Wealth Management and Trust Income	4	4	8	7
Capital Market and Foreign Exchange Gain (Loss)	2	1	3	3
Total non-interest income from contracts with customers (ASC 606)	38	38	74	74
Other non-interest income (Non-ASC 606 customer related)	1	0	(2)	(1)
Net interest income	179	176	358	342
Revenues	218	214	431	415
National Bank Of Arizona [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	3	3	6	6
Noninterest income, Customer-related Fees	10	9	19	17
Other non-interest income (non-customer related)	1	1	2	2
Noninterest Income	11	10	21	19
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other service charges, commissions, and fees	3	3	6	6
Wealth Management and Trust Income	0	0	1	1
Capital Market and Foreign Exchange Gain (Loss)	0	0	0	0
Total non-interest income from contracts with customers (ASC 606)	6	6	13	13
Other non-interest income (Non-ASC 606 customer related)	4	3	6	4
Net interest income	62	58	122	111
Revenues	73	68	143	130
Nevada State Bank [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	4	4	7	8
Noninterest income, Customer-related Fees	11	10	21	20
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	11	10	21	20
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other service charges, commissions, and fees	3	3	6	6
Wealth Management and Trust Income	1	1	2	2
Capital Market and Foreign Exchange Gain (Loss)	0	0	1	0
Total non-interest income from contracts with customers (ASC 606)	8	8	16	16
Other non-interest income (Non-ASC 606 customer related)	3	2	5	4
Net interest income	40	38	80	73
Revenues	51	48	101	93
Vectra Bank Colorado [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	2	2	4	4
Noninterest income, Customer-related Fees	6	6	12	12
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	6	6	12	12
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other service charges, commissions, and fees	2	2	3	3
Wealth Management and Trust Income	0	0	1	1
Capital Market and Foreign Exchange Gain (Loss)	0	0	0	0
Total non-interest income from contracts with customers (ASC 606)	4	4	8	8
Other non-interest income (Non-ASC 606 customer related)	2	2	4	4
Net interest income	36	34	72	66
Revenues	42	40	84	78
Commerce Bank Of Washington [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	0	0	1	1
Noninterest income, Customer-related Fees	1	1	2	3
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	1	1	2	3
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other service charges, commissions, and fees	1	1	1	1
Wealth Management and Trust Income	0	0	0	0
Capital Market and Foreign Exchange Gain (Loss)	0	0	0	0
Total non-interest income from contracts with customers (ASC 606)	1	1	2	2
Other non-interest income (Non-ASC 606 customer related)	0	0	0	1
Net interest income	14	12	28	24
Revenues	15	13	30	27
Other Segment [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	0	0	0	0
Noninterest income, Customer-related Fees	7	11	15	20
Other non-interest income (non-customer related)	1	12	12	25
Noninterest Income	8	23	27	45
Gains (Losses) on Sales of Other Real Estate	0	0	1	1
Other service charges, commissions, and fees	3	4	5	7
Wealth Management and Trust Income	4	4	7	7
Capital Market and Foreign Exchange Gain (Loss)	1	2	2	4
Total non-interest income from contracts with customers (ASC 606)	8	10	15	19
Other non-interest income (Non-ASC 606 customer related)	(1)	1	0	1
Net interest income	(34)	(28)	(56)	(42)
Revenues	26	(5)	(28)	4
Amegy Corporation [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	11	11	22	22
Noninterest income, Customer-related Fees	34	31	68	64
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	34	31	68	64
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other service charges, commissions, and fees	9	9	18	19
Wealth Management and Trust Income	3	3	5	5
Capital Market and Foreign Exchange Gain (Loss)	(2)	(1)	(3)	(3)
Total non-interest income from contracts with customers (ASC 606)	21	22	42	43
Other non-interest income (Non-ASC 606 customer related)	13	9	26	21
Net interest income	132	127	263	254
Revenues	166	158	331	318
California Bank Trust [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	7	7	14	14
Noninterest income, Customer-related Fees	22	19	41	38
Other non-interest income (non-customer related)	0	0	0	2
Noninterest Income	22	19	41	40
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other service charges, commissions, and fees	7	6	13	12
Wealth Management and Trust Income	1	1	2	2
Capital Market and Foreign Exchange Gain (Loss)	1	1	2	2
Total non-interest income from contracts with customers (ASC 606)	16	15	31	30
Other non-interest income (Non-ASC 606 customer related)	6	4	10	8
Net interest income	140	131	278	262
Revenues	162	150	319	302
Consolidated Entities [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	41	42	81	84
Noninterest income, Customer-related Fees	130	125	250	247
Other non-interest income (non-customer related)	2	13	14	29
Noninterest Income	132	138	264	276
Gains (Losses) on Sales of Other Real Estate	0	0	2	1
Other service charges, commissions, and fees	46	46	88	89
Wealth Management and Trust Income	13	13	26	25
Capital Market and Foreign Exchange Gain (Loss)	2	3	5	6
Total non-interest income from contracts with customers (ASC 606)	102	104	201	205
Other non-interest income (Non-ASC 606 customer related)	28	21	49	42
Net interest income	569	548	1,145	1,090
Revenues	$ 701	$ 686	$ 1,411	$ 1,367

Retirement Plans (Tables)

Retirement Plans (Tables)	6 Months Ended
	Jun. 30, 2019
Defined Benefit Plan [Abstract]
Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans	(In millions) Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Interest cost $ 1 $ 1 $ 3 $ 3 Expected return on plan assets (2) (3) (4) (6) Partial settlement loss — — — 1 Amortization of net actuarial loss 1 1 1 1 Net periodic cost (benefit) $ — $ (1) $ — $ (1)

Net Earnings per Common Share_2

Net Earnings per Common Share (Tables)	6 Months Ended
	Jun. 30, 2019
Table Text Block Supplement [Abstract]
Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block]	Three Months Ended Six Months Ended (In millions, except shares and per share amounts) 2019 2018 2019 2018 Basic: Net income $ 198 $ 197 $ 411 $ 435 Less common and preferred dividends 63 57 127 104 Undistributed earnings 135 140 284 331 Less undistributed earnings applicable to nonvested shares 1 1 2 3 Undistributed earnings applicable to common shares 134 139 282 328 Distributed earnings applicable to common shares 54 47 110 86 Total earnings applicable to common shares $ 188 $ 186 $ 392 $ 414 Weighted average common shares outstanding (in thousands) 179,156 195,583 181,946 196,149 Net earnings per common share $ 1.05 $ 0.95 $ 2.15 $ 2.11 Diluted: Total earnings applicable to common shares $ 188 $ 186 $ 392 $ 414 Weighted average common shares outstanding (in thousands) 179,156 195,583 181,946 196,149 Dilutive effect of common stock warrants (in thousands) 9,318 12,640 9,587 12,627 Dilutive effect of stock options (in thousands) 624 1,024 673 1,083 Weighted average diluted common shares outstanding (in thousands) 189,098 209,247 192,206 209,859 Net earnings per common share $ 0.99 $ 0.89 $ 2.04 $ 1.97
Schedule of Weighted Average Number of Shares [Table Text Block]	Three Months Ended Six Months Ended (In thousands) 2019 2018 2019 2018 Restricted stock and restricted stock units 1,446 1,709 1,435 1,733 Stock options 492 194 411 120

Operating Segment Information (

Operating Segment Information (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Reporting Information [Line Items]
Operating Segment Information	OPERATING SEGMENT INFORMATIONWe manage our operations and prepare management reports and other information with a primary focus on geographical area. Our banking operations are managed under their own individual brand names, including Zions Bank, Amegy Bank, California Bank & Trust, National Bank of Arizona, Nevada State Bank, Vectra Bank Colorado, and The Commerce Bank of Washington. Performance assessment and resource allocation are based upon this geographical structure. We use an internal funds transfer pricing (“FTP”) allocation system to report results of operations for business segments. This process is continually refined. Total average loans and deposits presented for the banking segments include insignificant intercompany amounts between banking segments and may also include deposits with the Other segment. As of June 30, 2019, our banking business is conducted through 7 locally managed and branded segments in distinct geographical areas. Zions Bank operates 98 branches in Utah, 24 branches in Idaho, and one branch in Wyoming. Amegy operates 74 branches in Texas. CB&T operates 87 branches in California. NBAZ operates 58 branches in Arizona. NSB operates 50 branches in Nevada. Vectra operates 36 branches in Colorado and one branch in New Mexico. TCBW operates two branches in Washington and one branch in Oregon. The operating segment identified as “Other” includes certain non-bank financial service subsidiaries, centralized back-office functions, and eliminations of transactions between segments. The major components of net interest income at the Bank’s back-office include the revenue associated with the investments securities portfolio and the offset of the FTP costs and benefits provided to the business segments. The following schedule does not present total assets or income tax expense for each operating segment, but instead presents average loans, average deposits and income before income taxes because these are the metrics that management uses when evaluating performance and making decisions pertaining to the operating segments. The Bank’s net interest income includes interest expense on borrowed funds. The condensed statement of income identifies the components of income and expense which affect the operating amounts presented in the Other segment. The accounting policies of the individual operating segments are the same as those of the Bank. Transactions between operating segments are primarily conducted at fair value, resulting in profits that are eliminated for reporting consolidated results of operations. The following schedule presents selected operating segment information for the three months ended June 30, 2019 and 2018: Zions Bank Amegy CB&T (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 179 $ 176 $ 132 $ 127 $ 140 $ 131 Provision for credit losses 16 5 (8) (6) 9 2 Net interest income after provision for loan losses 163 171 140 133 131 129 Noninterest income 39 38 34 31 22 19 Noninterest expense 120 117 86 86 82 76 Income (loss) before income taxes $ 82 $ 92 $ 88 $ 78 $ 71 $ 72 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 13,067 $ 12,633 $ 12,254 $ 11,387 $ 10,838 $ 9,908 Total average deposits 15,455 15,346 11,361 11,060 11,412 11,181 NBAZ NSB Vectra (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 62 $ 58 $ 40 $ 38 $ 36 $ 34 Provision for credit losses 2 7 — — 1 2 Net interest income after provision for loan losses 60 51 40 38 35 32 Noninterest income 11 10 11 10 6 6 Noninterest expense 38 38 37 36 27 25 Income (loss) before income taxes $ 33 $ 23 $ 14 $ 12 $ 14 $ 13 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 4,847 $ 4,640 $ 2,570 $ 2,349 $ 3,105 $ 2,881 Total average deposits 5,048 4,942 4,406 4,314 2,811 2,784 TCBW Other Consolidated Bank (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 14 $ 12 $ (34) $ (28) $ 569 $ 548 Provision for credit losses 2 1 (1) 1 21 12 Net interest income after provision for loan losses 12 11 (33) (29) 548 536 Noninterest income 1 1 8 23 132 138 Noninterest expense 5 5 29 38 424 421 Income (loss) before income taxes $ 8 $ 7 $ (54) $ (44) $ 256 $ 253 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 1,203 $ 1,117 $ 440 $ 327 $ 48,324 $ 45,242 Total average deposits 1,053 1,048 2,801 2,221 54,347 52,896 The following schedule presents selected operating segment information for the six months ended June 30, 2019 and 2018: Zions Bank Amegy CB&T (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 358 $ 342 $ 263 $ 254 $ 278 $ 262 Provision for loan losses 26 3 (23) (59) 12 5 Net interest income after provision for loan losses 332 339 286 313 266 257 Noninterest income 72 73 68 64 41 40 Noninterest expense 237 231 174 173 164 154 Income (loss) before income taxes $ 167 $ 181 $ 180 $ 204 $ 143 $ 143 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 13,004 $ 12,543 $ 12,058 $ 11,379 $ 10,707 $ 9,919 Total average deposits 15,490 15,211 11,401 10,938 11,328 11,150 NBAZ NSB Vectra (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 122 $ 111 $ 80 $ 73 $ 72 $ 66 Provision for credit losses 4 9 (1) — 5 5 Net interest income after provision for loan losses 118 102 81 73 67 61 Noninterest income 21 19 21 20 12 12 Noninterest expense 78 75 73 72 54 52 Income (loss) before income taxes $ 61 $ 46 $ 29 $ 21 $ 25 $ 21 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 4,798 $ 4,591 $ 2,535 $ 2,349 $ 3,080 $ 2,837 Total average deposits 4,972 4,863 4,368 4,269 2,816 2,748 TCBW Other Consolidated Bank (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 28 $ 24 $ (56) $ (42) $ 1,145 $ 1,090 Provision for credit losses 2 2 — — 25 (35) Net interest income after provision for loan losses 26 22 (56) (42) 1,120 1,125 Noninterest income 2 3 27 45 264 276 Noninterest expense 11 11 63 72 854 840 Income (loss) before income taxes $ 17 $ 14 $ (92) $ (69) $ 530 $ 561 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 1,156 $ 1,135 $ 412 $ 301 $ 47,750 $ 45,054 Total average deposits 1,064 1,060 2,694 2,208 54,133 52,447
Schedule of Segment Reporting Information, by Segment	Zions Bank Amegy CB&T (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 179 $ 176 $ 132 $ 127 $ 140 $ 131 Provision for credit losses 16 5 (8) (6) 9 2 Net interest income after provision for loan losses 163 171 140 133 131 129 Noninterest income 39 38 34 31 22 19 Noninterest expense 120 117 86 86 82 76 Income (loss) before income taxes $ 82 $ 92 $ 88 $ 78 $ 71 $ 72 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 13,067 $ 12,633 $ 12,254 $ 11,387 $ 10,838 $ 9,908 Total average deposits 15,455 15,346 11,361 11,060 11,412 11,181 NBAZ NSB Vectra (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 62 $ 58 $ 40 $ 38 $ 36 $ 34 Provision for credit losses 2 7 — — 1 2 Net interest income after provision for loan losses 60 51 40 38 35 32 Noninterest income 11 10 11 10 6 6 Noninterest expense 38 38 37 36 27 25 Income (loss) before income taxes $ 33 $ 23 $ 14 $ 12 $ 14 $ 13 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 4,847 $ 4,640 $ 2,570 $ 2,349 $ 3,105 $ 2,881 Total average deposits 5,048 4,942 4,406 4,314 2,811 2,784 TCBW Other Consolidated Bank (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 14 $ 12 $ (34) $ (28) $ 569 $ 548 Provision for credit losses 2 1 (1) 1 21 12 Net interest income after provision for loan losses 12 11 (33) (29) 548 536 Noninterest income 1 1 8 23 132 138 Noninterest expense 5 5 29 38 424 421 Income (loss) before income taxes $ 8 $ 7 $ (54) $ (44) $ 256 $ 253 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 1,203 $ 1,117 $ 440 $ 327 $ 48,324 $ 45,242 Total average deposits 1,053 1,048 2,801 2,221 54,347 52,896 The following schedule presents selected operating segment information for the six months ended June 30, 2019 and 2018: Zions Bank Amegy CB&T (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 358 $ 342 $ 263 $ 254 $ 278 $ 262 Provision for loan losses 26 3 (23) (59) 12 5 Net interest income after provision for loan losses 332 339 286 313 266 257 Noninterest income 72 73 68 64 41 40 Noninterest expense 237 231 174 173 164 154 Income (loss) before income taxes $ 167 $ 181 $ 180 $ 204 $ 143 $ 143 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 13,004 $ 12,543 $ 12,058 $ 11,379 $ 10,707 $ 9,919 Total average deposits 15,490 15,211 11,401 10,938 11,328 11,150 NBAZ NSB Vectra (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 122 $ 111 $ 80 $ 73 $ 72 $ 66 Provision for credit losses 4 9 (1) — 5 5 Net interest income after provision for loan losses 118 102 81 73 67 61 Noninterest income 21 19 21 20 12 12 Noninterest expense 78 75 73 72 54 52 Income (loss) before income taxes $ 61 $ 46 $ 29 $ 21 $ 25 $ 21 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 4,798 $ 4,591 $ 2,535 $ 2,349 $ 3,080 $ 2,837 Total average deposits 4,972 4,863 4,368 4,269 2,816 2,748 TCBW Other Consolidated Bank (In millions) 2019 2018 2019 2018 2019 2018 SELECTED INCOME STATEMENT DATA Net interest income $ 28 $ 24 $ (56) $ (42) $ 1,145 $ 1,090 Provision for credit losses 2 2 — — 25 (35) Net interest income after provision for loan losses 26 22 (56) (42) 1,120 1,125 Noninterest income 2 3 27 45 264 276 Noninterest expense 11 11 63 72 854 840 Income (loss) before income taxes $ 17 $ 14 $ (92) $ (69) $ 530 $ 561 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 1,156 $ 1,135 $ 412 $ 301 $ 47,750 $ 45,054 Total average deposits 1,064 1,060 2,694 2,208 54,133 52,447

Basis of Presentation (Details)

Basis of Presentation (Details)	Jun. 30, 2019States
Basis Of Presentation [Abstract]
Number of States in which Entity Operates	11
Number of community regional banks operating in distinct geographical areas	7

Accounting Policies (Details)

Accounting Policies (Details) $ in Millions	Jan. 01, 2019USD ($)
Accounting Policies [Abstract]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 3
Assets added upon adoption of new lease accounting standard	225
Liabilities added upon adoption of new lease accounting standard	$ 242

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	$ 0	$ 0	$ 0	$ (3,000,000)
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities		2,000,000		2,000,000
Other noninterest-bearing investments valued under the cost method	9,000,000		9,000,000		$ 10,000,000
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	332,000,000		332,000,000			$ 329,000,000
Fair value of AFS securities	14,672,000,000		14,672,000,000			14,737,000,000
Principal amount of other real estate owned property sold			2,000,000	2,000,000
Equity Method Investments, Fair Value Disclosure	38,000,000		38,000,000			35,000,000
Fair Value, Inputs, Level 1 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	40,000,000		40,000,000			40,000,000
Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	14,632,000,000		14,632,000,000			14,697,000,000
Fair Value, Inputs, Level 3 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	0		0			0
Third Party Pricing Service [Member] | Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	0.94		0.94			0.95
Interest Rate Swaps For Customers [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities, Fair Value Disclosure	11,000,000		11,000,000			36,000,000
Other Assets, Fair Value Disclosure	139,000,000		139,000,000			40,000,000
Interest Rate Swaps For Customers [Member] | Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities, Fair Value Disclosure	11,000,000		11,000,000			36,000,000
Other Assets, Fair Value Disclosure	139,000,000		139,000,000			40,000,000
Available-for-sale Securities [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	1,350,000,000		1,350,000,000			1,291,000,000
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	1,350,000,000		1,350,000,000			1,291,000,000
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities
Other Real Estate Owned Properties [Member]
Derivatives, Fair Value [Line Items]
Net gains on sale of OREO properties	0	$ 0	1,000,000	$ 1,000,000
Derivatives [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities, Fair Value Disclosure	1,000,000		1,000,000			1,000,000
Other Assets, Fair Value Disclosure	2,000,000		2,000,000			1,000,000
Derivatives [Member] | Fair Value, Inputs, Level 1 [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities, Fair Value Disclosure	2,000,000		2,000,000			2,000,000
Other Assets, Fair Value Disclosure	$ 3,000,000		$ 3,000,000			4,000,000
Derivatives [Member] | Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities, Fair Value Disclosure						$ 1,000,000

Fair Value (Schedule Of Assets

Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis) (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	$ 14,672,000,000	$ 14,737,000,000
Debt Securities, Trading, and Equity Securities, FV-NI	148,000,000	106,000,000
Assets, Fair Value Disclosure	15,742,000,000	15,619,000,000
Financial Instruments Sold, Not yet Purchased, at Fair Value	66,000,000	85,000,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	186,000,000	219,000,000
US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	13,297,000,000	13,425,000,000
Asset-backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	25,000,000	21,000,000
Interest Rate Swaps For Customers [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	139,000,000	40,000,000
Other Liabilities, Fair Value Disclosure	11,000,000	36,000,000
Available-for-sale Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	1,350,000,000	1,291,000,000
Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	2,000,000	1,000,000
Other Liabilities, Fair Value Disclosure	1,000,000	1,000,000
Bank-owned life insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	522,000,000	516,000,000
Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	105,000,000	102,000,000
Assets, Fair Value Disclosure	0	1,000,000
Interest-Only-Strip [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	19,000,000	18,000,000
Derivatives Designated As Hedging Instruments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	26,000,000
Foreign Exchange Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	3,000,000	4,000,000
Other Liabilities, Fair Value Disclosure	2,000,000	2,000,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	40,000,000	40,000,000
Debt Securities, Trading, and Equity Securities, FV-NI	18,000,000	14,000,000
Assets, Fair Value Disclosure	167,000,000	153,000,000
Financial Instruments Sold, Not yet Purchased, at Fair Value	66,000,000	85,000,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	174,000,000	182,000,000
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	40,000,000	40,000,000
Fair Value, Inputs, Level 1 [Member] | Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	3,000,000	4,000,000
Other Liabilities, Fair Value Disclosure	2,000,000	2,000,000
Fair Value, Inputs, Level 1 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	14,632,000,000	14,697,000,000
Debt Securities, Trading, and Equity Securities, FV-NI	130,000,000	92,000,000
Assets, Fair Value Disclosure	15,451,000,000	15,346,000,000
Financial Instruments Sold, Not yet Purchased, at Fair Value	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	12,000,000	37,000,000
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	13,257,000,000	13,385,000,000
Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	25,000,000	21,000,000
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps For Customers [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	139,000,000	40,000,000
Other Liabilities, Fair Value Disclosure	11,000,000	36,000,000
Fair Value, Inputs, Level 2 [Member] | Derivative Interest Rate Related And Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	2,000,000	1,000,000
Other Liabilities, Fair Value Disclosure	1,000,000
Fair Value, Inputs, Level 2 [Member] | Available-for-sale Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	1,350,000,000	1,291,000,000
Fair Value, Inputs, Level 2 [Member] | Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Liabilities, Fair Value Disclosure		1,000,000
Fair Value, Inputs, Level 2 [Member] | Bank-owned life insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	522,000,000	516,000,000
Fair Value, Inputs, Level 2 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member] | Derivatives Designated As Hedging Instruments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	26,000,000
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	124,000,000	120,000,000
Financial Instruments Sold, Not yet Purchased, at Fair Value	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure
Fair Value, Inputs, Level 3 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	105,000,000	102,000,000
Assets, Fair Value Disclosure	0	1,000,000
Fair Value, Inputs, Level 3 [Member] | Interest-Only-Strip [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	19,000,000	18,000,000
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	106,000,000	95,000,000
Other Liabilities, Fair Value Disclosure	106,000,000	95,000,000
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure		95,000,000
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Warranty, Rights and Obligations, Fair Value Option [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	106,000,000
Other Liabilities, Fair Value Disclosure	106,000,000	95,000,000
Third Party Pricing Service [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	$ 0.94	$ 0.95

Fair Value (Schedule Of Asset_2

Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis Using Level 3 Inputs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	$ 107	$ 100	$ 102	$ 95
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Equity Securities Gains (Losses), Net	(2)	1	(1)	1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Noninterest Income	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	1	4	6
Fair value of assets, Ending balance	105	102	105	102
Servicing Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	17	18	18	18
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Equity Securities Gains (Losses), Net	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Noninterest Income	2	0	1	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	0	0	0
Fair value of assets, Ending balance	$ 19	$ 18	$ 19	$ 18

Fair Value (Schedule Of Realize

Fair Value (Schedule Of Realized Gains (Losses) Using Level 3 Inputs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	$ 15,742		$ 15,742			$ 15,619
Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	105	$ 102	105	$ 102	$ 107	102	$ 100	$ 95
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Equity Securities Gains (Losses), Net	(2)	1	(1)	1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	1	4	6
Servicing Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	19	18	19	18	$ 17	18	$ 18	$ 18
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Equity Securities Gains (Losses), Net	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	$ 0	0	$ 0
Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	6		6			32
Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			1
Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	1		1			0
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	7		7			33
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	167		167			153
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 1 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	15,451		15,451			15,346
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	6		6			32
Fair Value, Inputs, Level 2 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	1		1			0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	7		7			32
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	124		124			120
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 3 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			1
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	$ 0		$ 0			$ 1

Fair Value (Schedule Of Asset_3

Fair Value (Schedule Of Assets With Fair Value Changes On Nonrecurring Basis) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Principal amount of other real estate owned property sold			$ 2	$ 2
Gains (losses) from fair value changes	$ (9)	$ (1)	(9)	(6)
Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains (losses) from fair value changes	(9)	(1)	(9)	(5)
Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains (losses) from fair value changes	0	0	0
Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains (losses) from fair value changes	$ 0	$ 0	$ 0	$ (1)

Fair Value (Schedule Of Carryin

Fair Value (Schedule Of Carrying Values And Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Held-to-maturity, fair value	$ 698
Long-term Debt	(1,236)	$ (724)
Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Held-to-maturity	695	774
Time deposits	4,915	4,336
Long-term Debt	(1,236)	(724)
Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases (including loans held for sale), net of allowance	48,219	46,312
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Held-to-maturity, fair value	698	767
Time deposits	4,923	4,319
Long-term Debt	(1,248)	(727)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases (including loans held for sale), net of allowance	$ 47,475	$ 45,251

Offsetting Assets and Liabili_3

Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell [Member] | Assets [Member]
Offsetting Assets [Line Items]
Net amount	$ 620	$ 1,461
Gross amounts recognized	876	1,461
Gross amounts offset in the balance sheet	(256)	0
Net amounts presented in the balance sheet	620	1,461
Gross amounts not offset in the balance sheet	0	0
Cash Collateral Received/Pledged	0	0
Derivative Financial Instruments, Assets [Member] | Assets [Member]
Offsetting Assets [Line Items]
Net amount	146	7
Gross amounts recognized	170	45
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	170	45
Gross amounts not offset in the balance sheet	(10)	(35)
Cash Collateral Received/Pledged	(14)	(3)
Assets, Total [Member] | Assets [Member]
Offsetting Assets [Line Items]
Net amount	766	1,468
Gross amounts recognized	1,046	1,506
Gross amounts offset in the balance sheet	(256)	0
Net amounts presented in the balance sheet	790	1,506
Gross amounts not offset in the balance sheet	(10)	(35)
Cash Collateral Received/Pledged	(14)	(3)
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member] | Other Liabilities [Member]
Offsetting Assets [Line Items]
Net amount	6,023	5,653
Gross amounts recognized	6,279	5,653
Gross amounts offset in the balance sheet	(256)	0
Net amounts presented in the balance sheet	6,023	5,653
Gross amounts not offset in the balance sheet	0	0
Cash Collateral Received/Pledged	0	0
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member]
Offsetting Assets [Line Items]
Net amount	2	3
Gross amounts recognized	14	39
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	14	39
Gross amounts not offset in the balance sheet	(10)	(35)
Cash Collateral Received/Pledged	(2)	(1)
Liabilities, Total [Member] | Other Liabilities [Member]
Offsetting Assets [Line Items]
Net amount	6,025	5,656
Gross amounts recognized	6,293	5,692
Gross amounts offset in the balance sheet	(256)	0
Net amounts presented in the balance sheet	6,037	5,692
Gross amounts not offset in the balance sheet	(10)	(35)
Cash Collateral Received/Pledged	$ (2)	$ (1)

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) $ in Millions	Jun. 30, 2019USD ($)hTMNumberinvestment	Dec. 31, 2018USD ($)hTMNumberinvestment
Investment [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 1	$ 2
Number of HTM investment securities in an unrealized loss position | hTMNumber	284	606
Number of AFS investment securities in an unrealized loss position | investment	1,182	2,588
Carrying value of pledged securities	$ 2,100	$ 2,600

Investment Securities (Summary

Investment Securities (Summary Of Investment Securities) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Investment [Line Items]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost	$ 138
Held-to-maturity, fair value	698
Available-for-sale, Amortized cost	14,659	$ 15,040
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I		23
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I		326
Available-for-sale, Estimated fair value	14,672	14,737
Available-for-sale Securities, Gross Unrealized Gain	121
Available-for-sale, Amortized cost	14,659
Available-for-sale, Gross unrealized losses, Recognized in OCI	108
Available-for-sale securities, Estimated fair value	14,672	14,737
amortized cost of investment securities	15,354	15,814
Gross Unrealized Gains of Investment Securities Recognized in OCI	126	27
Gross Unrealized Losses of Investment Securities Recognized in OCI	110	337
Estimated Fair Value of Investment Securities	15,370	15,504
Held-to-maturity, Due in one year or less, Estimated fair value	138
Available-for-sale, Due in one year or less, Amortized cost	177
Available-for-sale, Due in one year or less, Estimated fair value	177
Held-to-maturity, Due after one year through five years, Amortized cost	258
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	259
Available-for-sale, Due after one year through five years, Amortized cost	633
Available-for-sale, Due after one year through five years, Estimated fair value	636
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost	155
Held-to-maturity, Due after five years through ten years, Estimated fair value	158
Available-for-sale, Due after five years through ten years, Amortized cost	2,824
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	2,835
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	144
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	143
Available-for-sale, Due after ten years, Amortized cost	11,025
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	11,024
Held-to-maturity, Amortized cost	695
Available-for-sale, Other debt securities [Member]
Investment [Line Items]
Available-for-sale, Amortized cost	25	25
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	0	0
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	0	4
Available-for-sale, Estimated fair value	25	21
Small Business Administration Loan Backed Securities [Member]
Investment [Line Items]
Available-for-sale, Amortized cost	1,790	2,042
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	1	1
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	40	47
Available-for-sale, Estimated fair value	1,751	1,996
Agency Guaranteed Mortgage Backed Securities [Member]
Investment [Line Items]
Available-for-sale, Amortized cost	10,110	10,236
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	86	18
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	63	240
Available-for-sale, Estimated fair value	10,133	10,014
Agency Securities [Member]
Investment [Line Items]
Available-for-sale, Amortized cost	1,372	1,394
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	6	0
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	5	19
Available-for-sale, Estimated fair value	1,373	1,375
US Treasury Securities [Member]
Investment [Line Items]
Available-for-sale, Amortized cost	40	40
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	0	0
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	0	0
Available-for-sale, Estimated fair value	40	40
US States and Political Subdivisions Debt Securities [Member]
Investment [Line Items]
Held-to-maturity, fair value	698	767
Held-to-maturity, Amortized cost	695	774
Available-for-sale, Amortized cost	1,322	1,303
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	28	4
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	0	16
Available-for-sale, Estimated fair value	1,350	1,291
Held-to-maturity Securities, Unrecognized Holding Gain (Deprecated 2018-01-31)	5	4
Held-to-maturity Securities, Unrecognized Holding Loss (Deprecated 2018-01-31)	$ 2	$ 11

Investment Securities (Contract

Investment Securities (Contractual Maturities Debt Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost	$ 138
Held-to-maturity, Due in one year or less, Estimated fair value	138
Held-to-maturity, Due after one year through five years, Amortized cost	258
Held-to-maturity, Due after one year through five years, Estimated fair value	259
Held-to-maturity, Due after five years through ten years, Amortized cost	155
Held-to-maturity, Due after five years through ten years, Estimated fair value	158
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	144
Held-to-maturity, Due after ten years, Estimated fair value	143
Held-to-maturity, Amortized cost	695
Held-to-maturity, fair value	698
Available-for-sale, Due in one year or less, Amortized cost	177
Available-for-sale, Due in one year or less, Estimated fair value	177
Available-for-sale, Due after one year through five years, Amortized cost	633
Available-for-sale, Due after one year through five years, Estimated fair value	636
Available-for-sale, Due after five years through ten years, Amortized cost	2,824
Available-for-sale, Due after five years through ten years, Estimated fair value	2,835
Available-for-sale, Due after ten years, Amortized cost	11,025
Available-for-sale, Due after ten years, Estimated fair value	11,024
Available-for-sale, Amortized cost	14,659	$ 15,040
Available-for-sale, Estimated fair value	$ 14,672	$ 14,737

Investment Securities (Summar_2

Investment Securities (Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Investment [Line Items]
Investment Securities Gross Unrealized Losses Less Than 12 Months	$ 2	$ 40
Investment Securities Estimated Fair Value Less Than 12 Months	163	2,858
Investment Securities Gross Unrealized Losses 12 Months or More	108	297
Investment Securities Estimated Fair Value 12 Months or More	7,020	9,375
Investment Securities Gross Unrealized Losses Total	110	337
Investment Securities Estimated Fair Value Total	7,183	12,233
Available-for-sale Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2	39
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	150	2,772
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	106	287
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	6,745	8,937
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	108	326
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 6,895	$ 11,709

Investment Securities (Rollforw

Investment Securities (Rollforward Of Total Amount Of Credit-Related OTTI) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Noninterest Income	$ 95	$ 85	$ 191	$ 170
Taxable [Member]
Noninterest Income	83	73	168	147
Nontaxable [Member]
Noninterest Income	12	12	23	23
Held-to-maturity Securities [Member]
Noninterest Income	6	6	12	12
Held-to-maturity Securities [Member] | Taxable [Member]
Noninterest Income	2	3	4	5
Held-to-maturity Securities [Member] | Nontaxable [Member]
Noninterest Income	4	3	8	7
Available-for-sale Securities [Member]
Noninterest Income	87	77	176	155
Available-for-sale Securities [Member] | Taxable [Member]
Noninterest Income	81	70	164	142
Available-for-sale Securities [Member] | Nontaxable [Member]
Noninterest Income	6	7	12	13
Other Trading [Member]
Noninterest Income	2	2	3	3
Other Trading [Member] | Taxable [Member]
Noninterest Income	0	0	0	0
Other Trading [Member] | Nontaxable [Member]
Noninterest Income	$ 2	$ 2	$ 3	$ 3

Investment Securities (Gains An

Investment Securities (Gains And Losses, Including OTTI, Recognized In Statement Of Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Investments [Abstract]
Other noninterest-bearing investments, Nonmarketable equity securities, Gross gains	$ 1	$ 4	$ 5	$ 6
Other noninterest-bearing investments, Nonmarketable equity securities, Gross losses	4	3	7	5
Gain (Loss) on Investments	$ (3)	$ 1	$ (2)	$ 1

Loans And Allowance For Credi_3

Loans And Allowance For Credit Losses (Narrative) (Details)		3 Months Ended			6 Months Ended
		Jun. 30, 2019USD ($)		Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)d		Jun. 30, 2018USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Loans And Allowance For Credit Losses [Line Items]
Loans Credit Quality Outstanding, Commercial And Industrial		$ 14,883,000,000			$ 14,883,000,000				$ 14,513,000,000
Average recorded investment		279,000,000		$ 330,000,000	265,000,000		$ 310,000,000
Interest income recognized		1,000,000		0	2,000,000		8,000,000
Impaired Financing Receivable, Recorded Investment		257,000,000			257,000,000				261,000,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		14,000,000			14,000,000				9,000,000
Loans Modified As Troubled Debt Restructurings Loans					69,000,000		73,000,000
Unfunded Lending Commitments on Troubled Debt Restructuring		12,000,000			12,000,000				11,000,000
Loans and Leases Receivable, Gross		48,617,000,000			48,617,000,000				46,714,000,000
Financing Receivable, Recorded Investment, Current		48,402,000,000			48,402,000,000				46,539,000,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		4,000,000		8,000,000	8,000,000		9,000,000
Unearned income and fees, net of related costs		52,000,000			52,000,000				50,000,000
Land Development Loans		210,000,000			210,000,000				237,000,000
Loans at carrying value pledged as collateral for current and potential borrowings		23,300,000,000			23,300,000,000				22,600,000,000
Payments for Origination and Purchases of Loans Held-for-sale		170,000,000		235,000,000	263,000,000		400,000,000
Principal Balance of Loans Sold, Serviced Loans		2,200,000,000			2,200,000,000
Loans and Leases Receivable, Gain (Loss) on Sales, Net		3,000,000		4,000,000	5,000,000		7,000,000
Principle amount of loans held for sale sold		132,000,000		206,000,000	$ 250,000,000		312,000,000
Minimum number of days past due for nonaccrual status | d					90
Recorded investment in TDR loans modified with interest rates below market		84,000,000			$ 84,000,000				88,000,000
Provision for Loan and Lease Losses		20,000,000		5,000,000	22,000,000		(35,000,000)
Provision for Unfunded Lending Commitments (decrease)		1,000,000		7,000,000	3,000,000		0
Other Real Estate, Foreclosed Assets, and Repossessed Assets		1,000,000			1,000,000				2,000,000
Other Real Estate, In Process of Forecloseing Assets		8,000,000			8,000,000				10,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		121,000,000			121,000,000				89,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		94,000,000			94,000,000				86,000,000
Financing Receivable, Recorded Investment, Past Due		215,000,000			215,000,000				175,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		17,000,000			17,000,000				10,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	148,000,000			148,000,000				145,000,000
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		489,000,000			489,000,000				486,000,000
Allowance for loan losses		503,000,000		490,000,000	503,000,000		490,000,000	$ 497,000,000	495,000,000	$ 473,000,000	$ 518,000,000
Financing Receivable, Individually Evaluated for Impairment		285,000,000			285,000,000				291,000,000
Financing Receivable, Collectively Evaluated for Impairment		48,332,000,000			48,332,000,000				46,423,000,000
Loan Credit Quality Outstanding, Leasing		337,000,000			337,000,000				327,000,000
Commercial Lending Loans - Owner Occupied		7,828,000,000			7,828,000,000				7,661,000,000
Loans Credit Quality Outstanding, Municipal		2,059,000,000			2,059,000,000				1,661,000,000
Land Development Loans, Loans Receivable Commercial Construction and Land Development		2,609,000,000			2,609,000,000				2,186,000,000
Commercial Real Estate Term Loans		9,218,000,000			9,218,000,000				8,939,000,000
Loans Credit Quality Outstanding, Commercial Real Estate		11,827,000,000			11,827,000,000				11,125,000,000
Loans Credit Quality Outstanding, Home Equity Credit Line		2,929,000,000			2,929,000,000				2,937,000,000
Loans Credit Quality Outstanding, 1-4 Family Residential		7,440,000,000			7,440,000,000				7,176,000,000
Loans Credit Quality Outstanding, Construction and Other		644,000,000			644,000,000				643,000,000
Loans Credit Quality Outstanding, Bankcard		502,000,000			502,000,000				491,000,000
Loans Credit Quality Outstanding, Other		168,000,000			168,000,000				180,000,000
Impaired Financing Receivable, Related Allowance		13,000,000			13,000,000				8,000,000
Unpaid principal balance		309,000,000			309,000,000				310,000,000
Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Average recorded investment		1,000,000		1,000,000	1,000,000		1,000,000
Interest income recognized		0		0	0		0
Impaired Financing Receivable, Recorded Investment		1,000,000			1,000,000				1,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status		1,000,000			1,000,000				1,000,000
Impaired Financing Receivable, Related Allowance		0			0				0
Unpaid principal balance		1,000,000			1,000,000				1,000,000
Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Average recorded investment		3,000,000		2,000,000	2,000,000		1,000,000
Interest income recognized		0		0			0
Impaired Financing Receivable, Recorded Investment		3,000,000			3,000,000				1,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status		4,000,000			4,000,000				0
Impaired Financing Receivable, Related Allowance		0			0				0
Unpaid principal balance		3,000,000			3,000,000				1,000,000
One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Average recorded investment		55,000,000		57,000,000	55,000,000		55,000,000
Interest income recognized		0		0	0		0
Impaired Financing Receivable, Recorded Investment		52,000,000			52,000,000				57,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status		44,000,000			44,000,000				42,000,000
Impaired Financing Receivable, Related Allowance		2,000,000			2,000,000				2,000,000
Unpaid principal balance		60,000,000			60,000,000				69,000,000
Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		98,000,000			98,000,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3,000,000		5,000,000	6,000,000		5,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status		85,000,000			85,000,000				82,000,000
Impaired Financing Receivable, Related Allowance		10,000,000			10,000,000				4,000,000
Unpaid principal balance		129,000,000			129,000,000				112,000,000
Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Average recorded investment		14,000,000		15,000,000	14,000,000		14,000,000
Interest income recognized		0		0	0		0
Impaired Financing Receivable, Recorded Investment		14,000,000			14,000,000				14,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status		12,000,000			12,000,000				13,000,000
Impaired Financing Receivable, Related Allowance		0			0				0
Unpaid principal balance		15,000,000			15,000,000				15,000,000
Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Average recorded investment		72,000,000		74,000,000	71,000,000		70,000,000
Interest income recognized		0		0	0		0
Impaired Financing Receivable, Recorded Investment		69,000,000			69,000,000				72,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status		60,000,000			60,000,000				56,000,000
Impaired Financing Receivable, Related Allowance		2,000,000			2,000,000				2,000,000
Unpaid principal balance		78,000,000			78,000,000				85,000,000
Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Credit Quality Outstanding, Commercial And Industrial		14,883,000,000			14,883,000,000				14,513,000,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		11,000,000			11,000,000				6,000,000
Loans and Leases Receivable, Gross		25,107,000,000			$ 25,107,000,000				24,162,000,000
Subsequent payment default period, number of days | d					90
Provision for Loan and Lease Losses		(23,000,000)		18,000,000	$ 22,000,000		(58,000,000)
Provision for Unfunded Lending Commitments (decrease)		(1,000,000)		3,000,000	1,000,000		(5,000,000)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		327,000,000			327,000,000				325,000,000
Allowance for loan losses		338,000,000		321,000,000	338,000,000		321,000,000	328,000,000	331,000,000	329,000,000	371,000,000
Loan Credit Quality Outstanding, Leasing		337,000,000			337,000,000				327,000,000
Commercial Lending Loans - Owner Occupied		7,828,000,000			7,828,000,000				7,661,000,000
Loans Credit Quality Outstanding, Municipal		2,059,000,000			2,059,000,000				1,661,000,000
Loans and Leases Receivable, before Fees, Gross		25,107,000,000			25,107,000,000				24,162,000,000
Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Average recorded investment		0		0	0		0
Interest income recognized		0		0	0		0
Impaired Financing Receivable, Recorded Investment		0			0				0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		2,000,000			2,000,000				2,000,000
Loans and Leases Receivable, Gross		11,683,000,000			$ 11,683,000,000				11,427,000,000
Subsequent payment default period, number of days | d					60
Provision for Loan and Lease Losses		(4,000,000)		8,000,000	$ (2,000,000)		9,000,000
Provision for Unfunded Lending Commitments (decrease)		0		0	0		0
Financing Receivable, Recorded Investment, Nonaccrual Status		0			0				0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		49,000,000			49,000,000				52,000,000
Allowance for loan losses		51,000,000		47,000,000	51,000,000		47,000,000	56,000,000	54,000,000	40,000,000	44,000,000
Loans and Leases Receivable, before Fees, Gross		11,683,000,000			11,683,000,000				11,427,000,000
Loans Credit Quality Outstanding, Home Equity Credit Line		2,929,000,000			2,929,000,000				2,937,000,000
Loans Credit Quality Outstanding, 1-4 Family Residential		7,440,000,000			7,440,000,000				7,176,000,000
Loans Credit Quality Outstanding, Construction and Other		644,000,000			644,000,000				643,000,000
Loans Credit Quality Outstanding, Bankcard		502,000,000			502,000,000				491,000,000
Loans Credit Quality Outstanding, Other		168,000,000			168,000,000				180,000,000
Impaired Financing Receivable, Related Allowance		0			0				0
Unpaid principal balance		0			0				0
Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Average recorded investment		39,000,000		63,000,000	37,000,000		58,000,000
Interest income recognized		0		0	0		0
Impaired Financing Receivable, Recorded Investment		34,000,000			34,000,000				40,000,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment									1,000,000
Loans and Leases Receivable, Gross									11,125,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status		32,000,000			32,000,000				38,000,000
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment									109,000,000
Allowance for loan losses									110,000,000
Impaired Financing Receivable, Related Allowance		0			0				0
Unpaid principal balance		38,000,000			38,000,000				45,000,000
Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Average recorded investment		0		5,000,000	0		5,000,000
Interest income recognized		0		0	0		0
Impaired Financing Receivable, Recorded Investment									0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		1,000,000			1,000,000
Loans and Leases Receivable, Gross		11,827,000,000			11,827,000,000
Provision for Loan and Lease Losses		1,000,000		15,000,000	2,000,000		14,000,000
Provision for Unfunded Lending Commitments (decrease)		2,000,000		4,000,000	2,000,000		5,000,000
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		113,000,000			113,000,000
Allowance for loan losses		114,000,000		122,000,000	114,000,000		122,000,000	$ 113,000,000	110,000,000	$ 104,000,000	$ 103,000,000
Land Development Loans, Loans Receivable Commercial Construction and Land Development									2,186,000,000
Commercial Real Estate Term Loans		9,218,000,000			9,218,000,000				8,939,000,000
Loans Credit Quality Outstanding, Commercial Real Estate		11,827,000,000			11,827,000,000				11,125,000,000
Construction and Land Development [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		1,000,000			1,000,000				0
Land Development Loans, Loans Receivable Commercial Construction and Land Development		2,609,000,000			2,609,000,000
Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		0			0
Impaired Financing Receivable, Related Allowance		0			0				0
Unpaid principal balance		0			0				1,000,000
Bankcard And Other Revolving Plans [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		0			0				1,000,000
Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Average recorded investment		59,000,000		54,000,000	60,000,000		55,000,000
Interest income recognized		0		0	0		8,000,000
Impaired Financing Receivable, Recorded Investment		55,000,000			55,000,000				60,000,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		1,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status		69,000,000			69,000,000				67,000,000
Impaired Financing Receivable, Related Allowance		1,000,000			1,000,000				2,000,000
Unpaid principal balance		63,000,000			63,000,000				67,000,000
Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Average recorded investment		39,000,000		58,000,000	37,000,000		53,000,000
Interest income recognized		0		0	0		0
Impaired Financing Receivable, Recorded Investment		34,000,000			34,000,000				40,000,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		2,000,000	1,000,000		2,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status		31,000,000			31,000,000				38,000,000
Impaired Financing Receivable, Related Allowance		0			0				0
Unpaid principal balance		38,000,000			38,000,000				44,000,000
Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		11,683,000,000			11,683,000,000				11,427,000,000
Financing Receivable, Recorded Investment, Current		11,634,000,000			11,634,000,000				11,378,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		19,000,000			19,000,000				23,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		30,000,000			30,000,000				26,000,000
Financing Receivable, Recorded Investment, Past Due		49,000,000			49,000,000				49,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		2,000,000			2,000,000				2,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	23,000,000			23,000,000				23,000,000
Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		168,000,000			168,000,000				180,000,000
Financing Receivable, Recorded Investment, Current									179,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									1,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									0
Financing Receivable, Recorded Investment, Past Due		1,000,000			1,000,000				1,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									0
Consumer Portfolio Segment [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		167,000,000			167,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		1,000,000			1,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0			0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0			0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0			0				0
Finance Leases Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		337,000,000			337,000,000				327,000,000
Financing Receivable, Recorded Investment, Current									325,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									1,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									1,000,000
Financing Receivable, Recorded Investment, Past Due		0			0				2,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									0
Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		7,828,000,000			7,828,000,000				7,661,000,000
Financing Receivable, Recorded Investment, Current									7,621,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									23,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									17,000,000
Financing Receivable, Recorded Investment, Past Due		57,000,000			57,000,000				40,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									3,000,000
Owner Occupied [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		7,771,000,000			7,771,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		32,000,000			32,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		25,000,000			25,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		6,000,000			6,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	47,000,000			47,000,000				48,000,000
Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		2,059,000,000			2,059,000,000				1,661,000,000
Financing Receivable, Recorded Investment, Current									1,661,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									0
Financing Receivable, Recorded Investment, Past Due		1,000,000			1,000,000				0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									0
Municipal [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		2,058,000,000			2,058,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0			0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		1,000,000			1,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0			0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0			0				1,000,000
Commercial Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		25,107,000,000			25,107,000,000				24,162,000,000
Financing Receivable, Recorded Investment, Current		24,986,000,000			24,986,000,000				24,052,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		69,000,000			69,000,000				61,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		52,000,000			52,000,000				49,000,000
Financing Receivable, Recorded Investment, Past Due		121,000,000			121,000,000				110,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		10,000,000			10,000,000				7,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	101,000,000			101,000,000				96,000,000
Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		2,609,000,000			2,609,000,000				2,186,000,000
Financing Receivable, Recorded Investment, Current									2,185,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									1,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									0
Financing Receivable, Recorded Investment, Past Due		29,000,000			29,000,000				1,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		2,580,000,000			2,580,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		23,000,000			23,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		6,000,000			6,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		5,000,000			5,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0			0				0
Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		9,218,000,000			9,218,000,000				8,939,000,000
Financing Receivable, Recorded Investment, Current									8,924,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									4,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									11,000,000
Financing Receivable, Recorded Investment, Past Due		16,000,000			16,000,000				15,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									1,000,000
Term [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		9,202,000,000			9,202,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		10,000,000			10,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		6,000,000			6,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0			0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	24,000,000			24,000,000				26,000,000
Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		11,827,000,000			11,827,000,000				11,125,000,000
Financing Receivable, Recorded Investment, Current		11,782,000,000			11,782,000,000				11,109,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		33,000,000			33,000,000				5,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		12,000,000			12,000,000				11,000,000
Financing Receivable, Recorded Investment, Past Due		45,000,000			45,000,000				16,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		5,000,000			5,000,000				1,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	24,000,000			24,000,000				26,000,000
Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		2,929,000,000			2,929,000,000				2,937,000,000
Financing Receivable, Recorded Investment, Current									2,927,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									4,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									6,000,000
Financing Receivable, Recorded Investment, Past Due		10,000,000			10,000,000				10,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									0
Home Equity Line of Credit [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		2,919,000,000			2,919,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		6,000,000			6,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		4,000,000			4,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0			0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	6,000,000			6,000,000				4,000,000
One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		7,440,000,000			7,440,000,000				7,176,000,000
Financing Receivable, Recorded Investment, Current									7,143,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									15,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									18,000,000
Financing Receivable, Recorded Investment, Past Due		29,000,000			29,000,000				33,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									0
One Through Four Family Residential [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		7,411,000,000			7,411,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		8,000,000			8,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		21,000,000			21,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0			0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	17,000,000			17,000,000				19,000,000
Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		644,000,000			644,000,000				643,000,000
Financing Receivable, Recorded Investment, Current									642,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									1,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									0
Financing Receivable, Recorded Investment, Past Due		4,000,000			4,000,000				1,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									0
Construction And Other Consumer Real Estate [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		640,000,000			640,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		1,000,000			1,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		3,000,000			3,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0			0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0			0				0
Revolving Credit Facility [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		502,000,000			502,000,000				491,000,000
Financing Receivable, Recorded Investment, Current									487,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									2,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									2,000,000
Financing Receivable, Recorded Investment, Past Due		5,000,000			5,000,000				4,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									2,000,000
Revolving Credit Facility [Member] | Bankcard And Other Revolving Plans [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		497,000,000			497,000,000
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		3,000,000			3,000,000
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		2,000,000			2,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		2,000,000			2,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0			0				0
Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		97,000,000			97,000,000				112,000,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		0
Accruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,000,000			1,000,000				1,000,000
Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		33,000,000			33,000,000				39,000,000
Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		29,000,000			29,000,000				28,000,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		0
Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		12,000,000			12,000,000				12,000,000
Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		46,000,000			46,000,000				52,000,000
Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		8,000,000			8,000,000				11,000,000
Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Accruing [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		14,000,000			14,000,000				21,000,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		0
Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		8,000,000			8,000,000				11,000,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		0
Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		176,000,000			176,000,000				202,000,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		4,000,000		8,000,000	8,000,000		9,000,000
Nonaccruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,000,000			1,000,000				1,000,000
Nonaccruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		9,000,000			9,000,000				9,000,000
Nonaccruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		34,000,000			34,000,000				45,000,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3,000,000		5,000,000	6,000,000		5,000,000
Nonaccruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,000,000			2,000,000				1,000,000
Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		79,000,000			79,000,000				90,000,000
Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		11,000,000			11,000,000				10,000,000
Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		19,000,000			19,000,000				20,000,000
Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		14,000,000			14,000,000				14,000,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		1,000,000
Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		19,000,000			19,000,000				20,000,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		$ 2,000,000	1,000,000		$ 2,000,000
Outstanding Loan Balances [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment		168,000,000			168,000,000				164,000,000
Financing Receivable, Collectively Evaluated for Impairment		24,939,000,000			24,939,000,000				23,998,000,000
Outstanding Loan Balances [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment		69,000,000			69,000,000				72,000,000
Financing Receivable, Collectively Evaluated for Impairment		11,614,000,000			11,614,000,000				11,355,000,000
Outstanding Loan Balances [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment		48,000,000			48,000,000				55,000,000
Financing Receivable, Collectively Evaluated for Impairment		11,779,000,000			11,779,000,000				11,070,000,000
Pass [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		47,431,000,000			47,431,000,000				45,589,000,000
Pass [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Credit Quality Outstanding, Commercial And Industrial		14,247,000,000			14,247,000,000				13,891,000,000
Loan Credit Quality Outstanding, Leasing		321,000,000			321,000,000				313,000,000
Commercial Lending Loans - Owner Occupied		7,524,000,000			7,524,000,000				7,369,000,000
Loans Credit Quality Outstanding, Municipal		2,032,000,000			2,032,000,000				1,632,000,000
Loans and Leases Receivable, before Fees, Gross		24,124,000,000			24,124,000,000				23,205,000,000
Pass [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		11,610,000,000			11,610,000,000				11,357,000,000
Loans Credit Quality Outstanding, Home Equity Credit Line		2,913,000,000			2,913,000,000				2,920,000,000
Loans Credit Quality Outstanding, 1-4 Family Residential		7,391,000,000			7,391,000,000				7,129,000,000
Loans Credit Quality Outstanding, Construction and Other		639,000,000			639,000,000				641,000,000
Loans Credit Quality Outstanding, Bankcard		499,000,000			499,000,000				488,000,000
Loans Credit Quality Outstanding, Other		168,000,000			168,000,000				179,000,000
Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development									2,174,000,000
Commercial Real Estate Term Loans		9,111,000,000			9,111,000,000				8,853,000,000
Loans Credit Quality Outstanding, Commercial Real Estate		11,697,000,000			11,697,000,000				11,027,000,000
Pass [Member] | Construction and Land Development [Member]
Loans And Allowance For Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development		2,586,000,000			2,586,000,000
Special Mention [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		416,000,000			416,000,000				427,000,000
Special Mention [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Credit Quality Outstanding, Commercial And Industrial		273,000,000			273,000,000				322,000,000
Loan Credit Quality Outstanding, Leasing		11,000,000			11,000,000				10,000,000
Commercial Lending Loans - Owner Occupied		77,000,000			77,000,000				72,000,000
Loans Credit Quality Outstanding, Municipal		0			0				2,000,000
Loans and Leases Receivable, before Fees, Gross		361,000,000			361,000,000				406,000,000
Special Mention [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		0			0				0
Loans Credit Quality Outstanding, Home Equity Credit Line		0			0				0
Loans Credit Quality Outstanding, 1-4 Family Residential		0			0				0
Loans Credit Quality Outstanding, Construction and Other		0			0				0
Loans Credit Quality Outstanding, Bankcard		0			0				0
Loans Credit Quality Outstanding, Other		0			0				0
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development									11,000,000
Commercial Real Estate Term Loans		39,000,000			39,000,000				10,000,000
Loans Credit Quality Outstanding, Commercial Real Estate		55,000,000			55,000,000				21,000,000
Special Mention [Member] | Construction and Land Development [Member]
Loans And Allowance For Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development		16,000,000			16,000,000
Substandard [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		770,000,000			770,000,000				698,000,000
Substandard [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Credit Quality Outstanding, Commercial And Industrial		363,000,000			363,000,000				300,000,000
Loan Credit Quality Outstanding, Leasing		5,000,000			5,000,000				4,000,000
Commercial Lending Loans - Owner Occupied		227,000,000			227,000,000				220,000,000
Loans Credit Quality Outstanding, Municipal		27,000,000			27,000,000				27,000,000
Loans and Leases Receivable, before Fees, Gross		622,000,000			622,000,000				551,000,000
Substandard [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		73,000,000			73,000,000				70,000,000
Loans Credit Quality Outstanding, Home Equity Credit Line		16,000,000			16,000,000				17,000,000
Loans Credit Quality Outstanding, 1-4 Family Residential		49,000,000			49,000,000				47,000,000
Loans Credit Quality Outstanding, Construction and Other		5,000,000			5,000,000				2,000,000
Loans Credit Quality Outstanding, Bankcard		3,000,000			3,000,000				3,000,000
Loans Credit Quality Outstanding, Other		0			0				1,000,000
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development									1,000,000
Commercial Real Estate Term Loans		68,000,000			68,000,000				76,000,000
Loans Credit Quality Outstanding, Commercial Real Estate		75,000,000			75,000,000				77,000,000
Substandard [Member] | Construction and Land Development [Member]
Loans And Allowance For Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development		7,000,000			7,000,000
Doubtful [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		0			0				0
Doubtful [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Credit Quality Outstanding, Commercial And Industrial		0			0				0
Loan Credit Quality Outstanding, Leasing		0			0				0
Commercial Lending Loans - Owner Occupied		0			0				0
Loans Credit Quality Outstanding, Municipal		0			0				0
Loans and Leases Receivable, before Fees, Gross		0			0				0
Doubtful [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		0			0				0
Loans Credit Quality Outstanding, Home Equity Credit Line		0			0				0
Loans Credit Quality Outstanding, 1-4 Family Residential		0			0				0
Loans Credit Quality Outstanding, Construction and Other		0			0				0
Loans Credit Quality Outstanding, Bankcard		0			0				0
Loans Credit Quality Outstanding, Other		0			0				0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development									0
Commercial Real Estate Term Loans		0			0				0
Loans Credit Quality Outstanding, Commercial Real Estate		0			0				0
Doubtful [Member] | Construction and Land Development [Member]
Loans And Allowance For Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development		0			0
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		503,000,000			503,000,000
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		51,000,000			51,000,000
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		338,000,000			338,000,000
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Credit Quality Outstanding, Commercial Real Estate		114,000,000			114,000,000
Impaired Financing Receivable Recorded Investment With No Allowance [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		155,000,000			155,000,000				166,000,000
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		1,000,000			1,000,000				1,000,000
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		1,000,000			1,000,000				1,000,000
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		29,000,000			29,000,000				32,000,000
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		36,000,000			36,000,000				52,000,000
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		12,000,000			12,000,000				12,000,000
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		42,000,000			42,000,000				45,000,000
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		0			0				0
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		32,000,000			32,000,000				37,000,000
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		0			0				0
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		44,000,000			44,000,000				31,000,000
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		32,000,000			32,000,000				37,000,000
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		0			0
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		2,000,000			2,000,000
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		23,000,000			23,000,000
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		2,000,000			2,000,000
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		0			0
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		0			0
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		11,000,000			11,000,000
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		2,000,000			2,000,000
Impaired Financing Receivable Related Allowance [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		102,000,000			102,000,000				95,000,000
Impaired Financing Receivable Related Allowance [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									0
Impaired Financing Receivable Related Allowance [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									0
Impaired Financing Receivable Related Allowance [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									25,000,000
Impaired Financing Receivable Related Allowance [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		62,000,000			62,000,000				36,000,000
Impaired Financing Receivable Related Allowance [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									2,000,000
Impaired Financing Receivable Related Allowance [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		27,000,000			27,000,000				27,000,000
Impaired Financing Receivable Related Allowance [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									0
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		2,000,000			2,000,000				3,000,000
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									0
Impaired Financing Receivable Related Allowance [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									29,000,000
Impaired Financing Receivable Related Allowance [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									3,000,000
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	18,000,000			18,000,000				18,000,000
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	1,000,000			1,000,000				1,000,000
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	0			0				0
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									2,000,000
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	24,000,000			24,000,000				45,000,000
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	6,000,000			6,000,000				27,000,000
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	1,000,000			1,000,000				1,000,000
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	3,000,000			3,000,000				14,000,000
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]								2,000,000
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]								14,000,000
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	[2]		0	[2]			0
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,000,000	[2]		1,000,000	[2]			1,000,000
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		14,000,000	[2]		14,000,000	[2]			15,000,000
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	[2]		0	[2]			0
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	0			0
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	3,000,000			3,000,000
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	0			0
Multiple Modification Types [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	46,000,000			46,000,000				59,000,000
Multiple Modification Types [Member] | Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	27,000,000			27,000,000				32,000,000
Multiple Modification Types [Member] | Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	4,000,000			4,000,000				6,000,000
Multiple Modification Types [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Multiple Modification Types [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									14,000,000
Multiple Modification Types [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									6,000,000
Multiple Modification Types [Member] | Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	97,000,000			97,000,000				100,000,000
Multiple Modification Types [Member] | Nonaccruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									1,000,000
Multiple Modification Types [Member] | Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	51,000,000			51,000,000				41,000,000
Multiple Modification Types [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	7,000,000			7,000,000				7,000,000
Multiple Modification Types [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	11,000,000			11,000,000				1,000,000
Multiple Modification Types [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]								5,000,000
Multiple Modification Types [Member] | Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]								1,000,000
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	[3]		0	[3]			1,000,000
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		24,000,000	[3]		24,000,000	[3]			28,000,000
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		9,000,000	[3]		9,000,000	[3]			7,000,000
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		3,000,000	[3]		3,000,000	[3]			3,000,000
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	0			0
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	6,000,000			6,000,000
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	4,000,000			4,000,000
Interest Rate Below Market [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		8,000,000			8,000,000				8,000,000
Interest Rate Below Market [Member] | Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,000,000			1,000,000				1,000,000
Interest Rate Below Market [Member] | Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,000,000			1,000,000				2,000,000
Interest Rate Below Market [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Interest Rate Below Market [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									3,000,000
Interest Rate Below Market [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									2,000,000
Interest Rate Below Market [Member] | Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		18,000,000			18,000,000				18,000,000
Interest Rate Below Market [Member] | Nonaccruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Interest Rate Below Market [Member] | Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		10,000,000			10,000,000				10,000,000
Interest Rate Below Market [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0				0
Interest Rate Below Market [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		3,000,000			3,000,000				3,000,000
Interest Rate Below Market [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									6,000,000
Interest Rate Below Market [Member] | Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									3,000,000
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0				0
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,000,000			1,000,000				1,000,000
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,000,000			2,000,000				2,000,000
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0				0
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		4,000,000			4,000,000
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,000,000			1,000,000
Maturity Or Team Extension [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		11,000,000			11,000,000				11,000,000
Maturity Or Team Extension [Member] | Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		4,000,000			4,000,000				3,000,000
Maturity Or Team Extension [Member] | Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,000,000			2,000,000				2,000,000
Maturity Or Team Extension [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Maturity Or Team Extension [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									2,000,000
Maturity Or Team Extension [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									2,000,000
Maturity Or Team Extension [Member] | Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		17,000,000			17,000,000				17,000,000
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		6,000,000			6,000,000				6,000,000
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0				0
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0				0
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,000,000			1,000,000				0
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,000,000			1,000,000				2,000,000
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		4,000,000			4,000,000				4,000,000
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,000,000			2,000,000				1,000,000
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,000,000			1,000,000
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,000,000			2,000,000
Principal Forgiveness [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		13,000,000			13,000,000				14,000,000
Principal Forgiveness [Member] | Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		13,000,000			13,000,000				14,000,000
Principal Forgiveness [Member] | Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0				0
Principal Forgiveness [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Principal Forgiveness [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Principal Forgiveness [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Principal Forgiveness [Member] | Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		15,000,000			15,000,000				16,000,000
Principal Forgiveness [Member] | Nonaccruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Principal Forgiveness [Member] | Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,000,000			2,000,000				2,000,000
Principal Forgiveness [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,000,000			2,000,000				2,000,000
Principal Forgiveness [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0				0
Principal Forgiveness [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Principal Forgiveness [Member] | Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0				0
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		6,000,000			6,000,000				6,000,000
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0				0
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		7,000,000			7,000,000				8,000,000
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Payment Deferral [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,000,000			1,000,000				2,000,000
Payment Deferral [Member] | Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0				1,000,000
Payment Deferral [Member] | Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,000,000			1,000,000				1,000,000
Payment Deferral [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Payment Deferral [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Payment Deferral [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									1,000,000
Payment Deferral [Member] | Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		5,000,000			5,000,000				6,000,000
Payment Deferral [Member] | Nonaccruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Payment Deferral [Member] | Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		4,000,000			4,000,000				4,000,000
Payment Deferral [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1,000,000			1,000,000				0
Payment Deferral [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		2,000,000			2,000,000				2,000,000
Payment Deferral [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									1,000,000
Payment Deferral [Member] | Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									2,000,000
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0				0
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0				1,000,000
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0				0
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0				$ 0
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		$ 1,000,000			$ 1,000,000
[1]	1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.
[2]	1 Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.
[3]	2 Includes TDRs that resulted from a combination of any of the previous modification types.

Loans And Allowance For Credi_4

Loans And Allowance For Credit Losses (Summary Of Major Portfolio Segment And Specific Loan Class) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at end of period	$ 503	$ 490	$ 503	$ 490
Loans held for sale	105		105			$ 93
Loans Credit Quality Outstanding, Commercial And Industrial	14,883		14,883			14,513
Loan Credit Quality Outstanding, Leasing	337		337			327
Owner occupied	7,828		7,828			7,661
Loans Credit Quality Outstanding, Municipal	2,059		2,059			1,661
Land Development Loans, Loans Receivable Commercial Construction and Land Development	2,609		2,609			2,186
Term	9,218		9,218			8,939
Loans Credit Quality Outstanding, Commercial Real Estate	11,827		11,827			11,125
Provision for loan losses	(20)	(5)	(22)	35
Allowance for Loan and Lease Losses, Write-offs	(23)	(13)	(35)	(39)
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	9	25	21	46
Net loan and lease charge-offs	14	(12)	14	(7)
Reserve for unfunded lending commitments	60	58	60	58	$ 59	57	$ 51	$ 58
Provision for Unfunded Lending Commitments (decrease)	1	7	3	0
Allowance for loan and lease losses and reserve for unfunded lending commitments	563	$ 548	563	$ 548
Loans Credit Quality Outstanding, Home Equity Credit Line	2,929		2,929			2,937
Loans Credit Quality Outstanding, 1-4 Family Residential	7,440		7,440			7,176
Loans Credit Quality Outstanding, Construction and Other	644		644			643
Loans Credit Quality Outstanding, Bankcard	502		502			491
Loans Credit Quality Outstanding, Other	168		168			180
Loans and Leases Receivable, Gross	48,617		48,617			46,714
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross	25,107		25,107			24,162
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross	$ 11,683		$ 11,683			$ 11,427

Loans And Allowance For Credi_5

Loans And Allowance For Credit Losses (Summary Of Changes In The Allowance For Credit Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	$ (20)	$ (5)	$ (22)	$ 35
Allowance for Loan and Lease Losses, Write-offs	(23)	(13)	(35)	(39)
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	497	473	495	518
Net loan and lease charge-offs	14	(12)	14	(7)
Balance at end of period	60	58	60	58
Allowance for loan losses	503	473	503	518	$ 503	$ 497	$ 495	$ 490	$ 473	$ 518
Reserve for unfunded lending commitments	60	58	60	58	60	59	57	58	51	58
Allowance for loan and lease losses and reserve for unfunded lending commitments					563			548
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	9	25	21	46
Provision for Unfunded Lending Commitments (decrease)	1	7	3	0
Balance at end of period	503	490	503	490
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	23	(18)	(22)	58
Allowance for Loan and Lease Losses, Write-offs	(19)	(10)	(27)	(30)
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	328	329	331	371
Net loan and lease charge-offs	13	(10)	15	(8)
Balance at end of period	41	43	41	43
Allowance for loan losses	328	329	338	371	338	328	331	321	329	371
Reserve for unfunded lending commitments	41	43	41	43	41	42	40	43	40	48
Allowance for loan and lease losses and reserve for unfunded lending commitments					379			364
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	6	20	12	38
Provision for Unfunded Lending Commitments (decrease)	(1)	3	1	(5)
Balance at end of period	338	321	338	321
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	(1)	(15)	(2)	(14)
Allowance for Loan and Lease Losses, Write-offs	0	0	(1)	0
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	113	104	110	103
Net loan and lease charge-offs	0	(3)	(2)	(5)
Balance at end of period	19	15	19	15
Allowance for loan losses	113	104	114	103	114	113	110	122	104	103
Reserve for unfunded lending commitments	19	15	19	15	19	17	17	15	11	10
Allowance for loan and lease losses and reserve for unfunded lending commitments					133			137
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	0	3	3	5
Provision for Unfunded Lending Commitments (decrease)	2	4	2	5
Balance at end of period	114	122	114	122
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	4	(8)	2	(9)
Allowance for Loan and Lease Losses, Write-offs	(4)	(3)	(7)	(9)
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	56	40	54	44
Net loan and lease charge-offs	1	1	1	6
Balance at end of period	0	0	0	0
Allowance for loan losses	56	40	51	47	51	56	54	47	40	44
Reserve for unfunded lending commitments	0	0	0	0	0	$ 0	$ 0	0	$ 0	$ 0
Allowance for loan and lease losses and reserve for unfunded lending commitments					$ 51			$ 47
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	3	2	6	3
Provision for Unfunded Lending Commitments (decrease)	0	0	0	0
Balance at end of period	$ 51	$ 47	$ 51	$ 47

Loans And Allowance For Credi_6

Loans And Allowance For Credit Losses (Summary Of ALLL And Outstanding Loan Balances According To The Company's Impairment Method) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 279	$ 330	$ 265	$ 310
Impaired Financing Receivable, Interest Income, Accrual Method	1	0	2	8
Allowance for loan losses: Individually evaluated for impairment	(14)		(14)			$ (9)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	489		489			486
Financing Receivable, Individually Evaluated for Impairment	285		285			291
Financing Receivable, Collectively Evaluated for Impairment	48,332		48,332			46,423
Loans and Leases Receivable, Gross	48,617		48,617			46,714
Allowance for loan losses	503	490	503	490	$ 497	495	$ 473	$ 518
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	59	54	60	55
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	8
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Individually evaluated for impairment	(11)		(11)			(6)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	327		327			325
Loans and Leases Receivable, Gross	25,107		25,107			24,162
Allowance for loan losses	338	321	338	321	328	331	329	371
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	0	5	0	5
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Allowance for loan losses: Individually evaluated for impairment	(1)		(1)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	113		113
Loans and Leases Receivable, Gross	11,827		11,827
Allowance for loan losses	114	122	114	122	113	110	104	103
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	0	0	0	0
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Allowance for loan losses: Individually evaluated for impairment	(2)		(2)			(2)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	49		49			52
Loans and Leases Receivable, Gross	11,683		11,683			11,427
Allowance for loan losses	51	47	51	47	$ 56	54	$ 40	$ 44
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	168	193	157	182
Impaired Financing Receivable, Interest Income, Accrual Method	1	0	2	8
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	39	58	37	53
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	39	63	37	58
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Allowance for loan losses: Individually evaluated for impairment						(1)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment						109
Loans and Leases Receivable, Gross						11,125
Allowance for loan losses						110
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	14	15	14	14
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	55	57	55	55
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	3	2	2	1
Impaired Financing Receivable, Interest Income, Accrual Method	0	0		0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	72	74	71	70
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	1	1	1	1
Impaired Financing Receivable, Interest Income, Accrual Method	0	$ 0	0	$ 0
Outstanding Loan Balances [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	168		168			164
Financing Receivable, Collectively Evaluated for Impairment	24,939		24,939			23,998
Outstanding Loan Balances [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	48		48			55
Financing Receivable, Collectively Evaluated for Impairment	11,779		11,779			11,070
Outstanding Loan Balances [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	69		69			72
Financing Receivable, Collectively Evaluated for Impairment	$ 11,614		$ 11,614			$ 11,355

Loans And Allowance For Credi_7

Loans And Allowance For Credit Losses (Summary Of Nonaccrual Loans) (Details) - USD ($) $ in Millions		Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	[1]	$ 148	$ 145
loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		0	6
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		0	0
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		1	2
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		69	67
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		1	1
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		156	152
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		31	38
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		32	38
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		12	13
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		44	42
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		4	0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		60	56
Financing Receivables, Total [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		$ 248	$ 246
[1]	1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

Loans And Allowance For Credi_8

Loans And Allowance For Credit Losses (Summary Of Past Due Loans (Accruing And Nonaccruing)) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 4	$ 8	$ 8	$ 9
Financing Receivable, Recorded Investment, Current		48,402		48,402		$ 46,539
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		121		121		89
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		94		94		86
Financing Receivable, Recorded Investment, Past Due		215		215		175
Loans and Leases Receivable, Gross		48,617		48,617		46,714
Accruing loans 90+ days past due		17		17		10
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	148		148		145
Bankcard And Other Revolving Plans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		0		0		1
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3	5	6	5
Financing Receivable, Recorded Investment, Nonaccrual Status		85		85		82
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		25,107		25,107		24,162
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3	5	6	6
Financing Receivable, Recorded Investment, Nonaccrual Status		156		156		152
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		11,827		11,827
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		11,683		11,683		11,427
Financing Receivable, Recorded Investment, Nonaccrual Status		0		0		0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		60		60		56
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		1		1		2
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	1
Financing Receivable, Recorded Investment, Nonaccrual Status		69		69		67
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		1		1		1
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	2	1	2
Financing Receivable, Recorded Investment, Nonaccrual Status		31		31		38
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross						11,125
Financing Receivable, Recorded Investment, Nonaccrual Status		32		32		38
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		12		12		13
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		44		44		42
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		4		4		0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		11,634		11,634		11,378
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		19		19		23
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		30		30		26
Financing Receivable, Recorded Investment, Past Due		49		49		49
Loans and Leases Receivable, Gross		11,683		11,683		11,427
Accruing loans 90+ days past due		2		2		2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	23		23		23
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						179
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						0
Financing Receivable, Recorded Investment, Past Due		1		1		1
Loans and Leases Receivable, Gross		168		168		180
Accruing loans 90+ days past due						0
Consumer Portfolio Segment [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		167		167
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		1		1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0		0
Revolving Credit Facility [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						487
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						2
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						2
Financing Receivable, Recorded Investment, Past Due		5		5		4
Loans and Leases Receivable, Gross		502		502		491
Accruing loans 90+ days past due						2
Revolving Credit Facility [Member] | Bankcard And Other Revolving Plans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		497		497
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		3		3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		2		2
Accruing loans 90+ days past due		2		2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0		0
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						642
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						0
Financing Receivable, Recorded Investment, Past Due		4		4		1
Loans and Leases Receivable, Gross		644		644		643
Accruing loans 90+ days past due						0
Construction And Other Consumer Real Estate [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		640		640
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		1		1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		3		3
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0		0
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						7,143
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						15
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						18
Financing Receivable, Recorded Investment, Past Due		29		29		33
Loans and Leases Receivable, Gross		7,440		7,440		7,176
Accruing loans 90+ days past due						0
One Through Four Family Residential [Member] | One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		7,411		7,411
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		8		8
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		21		21
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	17		17		19
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						2,927
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						4
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						6
Financing Receivable, Recorded Investment, Past Due		10		10		10
Loans and Leases Receivable, Gross		2,929		2,929		2,937
Accruing loans 90+ days past due						0
Home Equity Line of Credit [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		2,919		2,919
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		6		6
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		4		4
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	6		6		4
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		11,782		11,782		11,109
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		33		33		5
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		12		12		11
Financing Receivable, Recorded Investment, Past Due		45		45		16
Loans and Leases Receivable, Gross		11,827		11,827		11,125
Accruing loans 90+ days past due		5		5		1
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	24		24		26
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						8,924
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						4
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						11
Financing Receivable, Recorded Investment, Past Due		16		16		15
Loans and Leases Receivable, Gross		9,218		9,218		8,939
Accruing loans 90+ days past due						1
Term [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		9,202		9,202
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		10		10
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		6		6
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	24		24		26
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						2,185
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						0
Financing Receivable, Recorded Investment, Past Due		29		29		1
Loans and Leases Receivable, Gross		2,609		2,609		2,186
Accruing loans 90+ days past due						0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		2,580		2,580
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		23		23
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		6		6
Accruing loans 90+ days past due		5		5
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0		0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		24,986		24,986		24,052
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		69		69		61
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		52		52		49
Financing Receivable, Recorded Investment, Past Due		121		121		110
Loans and Leases Receivable, Gross		25,107		25,107		24,162
Accruing loans 90+ days past due		10		10		7
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	101		101		96
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						1,661
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						0
Financing Receivable, Recorded Investment, Past Due		1		1		0
Loans and Leases Receivable, Gross		2,059		2,059		1,661
Accruing loans 90+ days past due						0
Municipal [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		2,058		2,058
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		1		1
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0		1
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						7,621
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						23
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						17
Financing Receivable, Recorded Investment, Past Due		57		57		40
Loans and Leases Receivable, Gross		7,828		7,828		7,661
Accruing loans 90+ days past due						3
Owner Occupied [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		7,771		7,771
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		32		32
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		25		25
Accruing loans 90+ days past due		6		6
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	47		47		48
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						325
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						1
Financing Receivable, Recorded Investment, Past Due		0		0		2
Loans and Leases Receivable, Gross		337		337		327
Accruing loans 90+ days past due						0
Finance Leases Portfolio Segment [Member] | Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		337		337
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1		1		1
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						14,445
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						37
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						31
Financing Receivable, Recorded Investment, Past Due		63		63		68
Loans and Leases Receivable, Gross		14,883		14,883		14,513
Accruing loans 90+ days past due						4
Commercial And Industrial [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		14,820		14,820
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		37		37
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		26		26
Accruing loans 90+ days past due		4		4
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	53		53		46
loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		105		105		89
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0		0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0		4
Financing Receivable, Recorded Investment, Past Due		0		0		4
Loans and Leases Receivable, Gross		105		105		93
Accruing loans 90+ days past due		0		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0		$ 2
Accruing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Accruing [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Accruing [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Nonaccruing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		4	8	8	9
Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3	5	6	5
Nonaccruing [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3	5	6	6
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	1
Nonaccruing [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 0	$ 2	$ 1	$ 2
[1]	1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

Loans And Allowance For Credi_9

Loans And Allowance For Credit Losses (Summary Of Outstanding Loan Balances (Accruing And Nonaccruing) Categorized By Credit Quality Indicators) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans Credit Quality Outstanding, Commercial And Industrial		$ 14,883		$ 14,883		$ 14,513
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		4	$ 8	8	$ 9
Financing Receivable, Recorded Investment, Current		48,402		48,402		46,539
Loans held for sale		105		105		93
Loan Credit Quality Outstanding, Leasing		337		337		327
Owner occupied		7,828		7,828		7,661
Municipal		2,059		2,059		1,661
Land Development Loans, Loans Receivable Commercial Construction and Land Development		2,609		2,609		2,186
Term		9,218		9,218		8,939
Loans Credit Quality Outstanding, Commercial Real Estate		11,827		11,827		11,125
Loans Credit Quality Outstanding, Home Equity Credit Line		2,929		2,929		2,937
Loans Credit Quality Outstanding, 1-4 Family Residential		7,440		7,440		7,176
Loans Credit Quality Outstanding, Construction and Other		644		644		643
Loans Credit Quality Outstanding, Bankcard		502		502		491
Other		168		168		180
Loans and Leases Receivable, Gross		48,617		48,617		46,714
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		121		121		89
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		94		94		86
Financing Receivable, Recorded Investment, Past Due		215		215		175
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		17		17		10
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	148		148		145
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		11,683		11,683		11,427
Loans Credit Quality Outstanding, Home Equity Credit Line		2,929		2,929		2,937
Loans Credit Quality Outstanding, 1-4 Family Residential		7,440		7,440		7,176
Loans Credit Quality Outstanding, Construction and Other		644		644		643
Loans Credit Quality Outstanding, Bankcard		502		502		491
Other		168		168		180
Loans and Leases Receivable, Gross		11,683		11,683		11,427
Financing Receivable, Recorded Investment, Nonaccrual Status		0		0		0
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development						2,186
Term		9,218		9,218		8,939
Loans Credit Quality Outstanding, Commercial Real Estate		11,827		11,827		11,125
Loans and Leases Receivable, Gross		11,827		11,827
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans Credit Quality Outstanding, Commercial And Industrial		14,883		14,883		14,513
Loan Credit Quality Outstanding, Leasing		337		337		327
Owner occupied		7,828		7,828		7,661
Municipal		2,059		2,059		1,661
Loans and Leases Receivable, before Fees, Gross		25,107		25,107		24,162
Loans and Leases Receivable, Gross		25,107		25,107		24,162
Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		47,431		47,431		45,589
Pass [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		11,610		11,610		11,357
Loans Credit Quality Outstanding, Home Equity Credit Line		2,913		2,913		2,920
Loans Credit Quality Outstanding, 1-4 Family Residential		7,391		7,391		7,129
Loans Credit Quality Outstanding, Construction and Other		639		639		641
Loans Credit Quality Outstanding, Bankcard		499		499		488
Other		168		168		179
Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development						2,174
Term		9,111		9,111		8,853
Loans Credit Quality Outstanding, Commercial Real Estate		11,697		11,697		11,027
Pass [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans Credit Quality Outstanding, Commercial And Industrial		14,247		14,247		13,891
Loan Credit Quality Outstanding, Leasing		321		321		313
Owner occupied		7,524		7,524		7,369
Municipal		2,032		2,032		1,632
Loans and Leases Receivable, before Fees, Gross		24,124		24,124		23,205
Special Mention [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		416		416		427
Special Mention [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		0		0		0
Loans Credit Quality Outstanding, Home Equity Credit Line		0		0		0
Loans Credit Quality Outstanding, 1-4 Family Residential		0		0		0
Loans Credit Quality Outstanding, Construction and Other		0		0		0
Loans Credit Quality Outstanding, Bankcard		0		0		0
Other		0		0		0
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development						11
Term		39		39		10
Loans Credit Quality Outstanding, Commercial Real Estate		55		55		21
Special Mention [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans Credit Quality Outstanding, Commercial And Industrial		273		273		322
Loan Credit Quality Outstanding, Leasing		11		11		10
Owner occupied		77		77		72
Municipal		0		0		2
Loans and Leases Receivable, before Fees, Gross		361		361		406
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross						495
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross						54
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans Credit Quality Outstanding, Commercial Real Estate						110
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross						331
Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		0		0		0
Doubtful [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		0		0		0
Loans Credit Quality Outstanding, Home Equity Credit Line		0		0		0
Loans Credit Quality Outstanding, 1-4 Family Residential		0		0		0
Loans Credit Quality Outstanding, Construction and Other		0		0		0
Loans Credit Quality Outstanding, Bankcard		0		0		0
Other		0		0		0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development						0
Term		0		0		0
Loans Credit Quality Outstanding, Commercial Real Estate		0		0		0
Doubtful [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans Credit Quality Outstanding, Commercial And Industrial		0		0		0
Loan Credit Quality Outstanding, Leasing		0		0		0
Owner occupied		0		0		0
Municipal		0		0		0
Loans and Leases Receivable, before Fees, Gross		0		0		0
Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		770		770		698
Substandard [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		73		73		70
Loans Credit Quality Outstanding, Home Equity Credit Line		16		16		17
Loans Credit Quality Outstanding, 1-4 Family Residential		49		49		47
Loans Credit Quality Outstanding, Construction and Other		5		5		2
Loans Credit Quality Outstanding, Bankcard		3		3		3
Other		0		0		1
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Land Development Loans, Loans Receivable Commercial Construction and Land Development						1
Term		68		68		76
Loans Credit Quality Outstanding, Commercial Real Estate		75		75		77
Substandard [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans Credit Quality Outstanding, Commercial And Industrial		363		363		300
Loan Credit Quality Outstanding, Leasing		5		5		4
Owner occupied		227		227		220
Municipal		27		27		27
Loans and Leases Receivable, before Fees, Gross		622		622		551
loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		105		105		89
Loans and Leases Receivable, Gross		105		105		93
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0		0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0		4
Financing Receivable, Recorded Investment, Past Due		0		0		4
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0		2
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						14,445
Loans and Leases Receivable, Gross		14,883		14,883		14,513
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						37
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						31
Financing Receivable, Recorded Investment, Past Due		63		63		68
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing						4
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		11,634		11,634		11,378
Loans and Leases Receivable, Gross		11,683		11,683		11,427
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		19		19		23
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		30		30		26
Financing Receivable, Recorded Investment, Past Due		49		49		49
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		2		2		2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	23		23		23
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						179
Loans and Leases Receivable, Gross		168		168		180
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						0
Financing Receivable, Recorded Investment, Past Due		1		1		1
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing						0
Consumer Portfolio Segment [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		167		167
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		1		1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0		0
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						8,924
Loans and Leases Receivable, Gross		9,218		9,218		8,939
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						4
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						11
Financing Receivable, Recorded Investment, Past Due		16		16		15
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing						1
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						2,185
Loans and Leases Receivable, Gross		2,609		2,609		2,186
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						0
Financing Receivable, Recorded Investment, Past Due		29		29		1
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing						0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		2,580		2,580
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		23		23
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		6		6
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		5		5
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0		0
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						325
Loans and Leases Receivable, Gross		337		337		327
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						1
Financing Receivable, Recorded Investment, Past Due		0		0		2
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing						0
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						7,621
Loans and Leases Receivable, Gross		7,828		7,828		7,661
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						23
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						17
Financing Receivable, Recorded Investment, Past Due		57		57		40
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing						3
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						1,661
Loans and Leases Receivable, Gross		2,059		2,059		1,661
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						0
Financing Receivable, Recorded Investment, Past Due		1		1		0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing						0
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		11,782		11,782		11,109
Loans and Leases Receivable, Gross		11,827		11,827		11,125
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		33		33		5
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		12		12		11
Financing Receivable, Recorded Investment, Past Due		45		45		16
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		5		5		1
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	24		24		26
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						2,927
Loans and Leases Receivable, Gross		2,929		2,929		2,937
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						4
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						6
Financing Receivable, Recorded Investment, Past Due		10		10		10
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing						0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		24,986		24,986		24,052
Loans and Leases Receivable, Gross		25,107		25,107		24,162
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		69		69		61
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		52		52		49
Financing Receivable, Recorded Investment, Past Due		121		121		110
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		10		10		7
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	101		101		96
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						7,143
Loans and Leases Receivable, Gross		7,440		7,440		7,176
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						15
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						18
Financing Receivable, Recorded Investment, Past Due		29		29		33
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing						0
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current						642
Loans and Leases Receivable, Gross		644		644		643
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due						1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due						0
Financing Receivable, Recorded Investment, Past Due		$ 4		$ 4		1
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing						$ 0
[1]	1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

Loans And Allowance For Cred_10

Loans And Allowance For Credit Losses (Summary Of Information On Impaired Loans) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	$ 309		$ 309		$ 310
Impaired Financing Receivable, Recorded Investment	257		257		261
Impaired Financing Receivable, Related Allowance	13		13		8
Average recorded investment	279	$ 330	265	$ 310
Interest income recognized	1	0	2	8
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	129		129		112
Impaired Financing Receivable, Recorded Investment	98		98
Impaired Financing Receivable, Related Allowance	10		10		4
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	63		63		67
Impaired Financing Receivable, Recorded Investment	55		55		60
Impaired Financing Receivable, Related Allowance	1		1		2
Average recorded investment	59	54	60	55
Interest income recognized	0	0	0	8
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1		1		1
Impaired Financing Receivable, Recorded Investment	1		1		1
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	1	1	1	1
Interest income recognized	0	0	0	0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	193		193		180
Impaired Financing Receivable, Recorded Investment	154		154		149
Impaired Financing Receivable, Related Allowance	11		11		6
Average recorded investment	168	193	157	182
Interest income recognized	1	0	2	8
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					0
Average recorded investment	0	5	0	5
Interest income recognized	0	0	0	0
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	38		38		44
Impaired Financing Receivable, Recorded Investment	34		34		40
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	39	58	37	53
Interest income recognized	0	0	0	0
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	38		38		45
Impaired Financing Receivable, Recorded Investment	34		34		40
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	39	63	37	58
Interest income recognized	0	0	0	0
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	15		15		15
Impaired Financing Receivable, Recorded Investment	14		14		14
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	14	15	14	14
Interest income recognized	0	0	0	0
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	0		0		0
Impaired Financing Receivable, Recorded Investment	0		0		0
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	0	0	0	0
Interest income recognized	0	0	0	0
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	60		60		69
Impaired Financing Receivable, Recorded Investment	52		52		57
Impaired Financing Receivable, Related Allowance	2		2		2
Average recorded investment	55	57	55	55
Interest income recognized	0	0	0	0
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3		3		1
Impaired Financing Receivable, Recorded Investment	3		3		1
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	3	2	2	1
Interest income recognized	0	0		0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	78		78		85
Impaired Financing Receivable, Recorded Investment	69		69		72
Impaired Financing Receivable, Related Allowance	2		2		2
Average recorded investment	72	74	71	70
Interest income recognized	0	0	0	0
Impaired Financing Receivable Related Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	102		102		95
Impaired Financing Receivable Related Allowance [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	62		62		36
Impaired Financing Receivable Related Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					29
Impaired Financing Receivable Related Allowance [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					0
Impaired Financing Receivable Related Allowance [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	73		73		65
Impaired Financing Receivable Related Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					3
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	2		2		3
Impaired Financing Receivable Related Allowance [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					2
Impaired Financing Receivable Related Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					0
Impaired Financing Receivable Related Allowance [Member] | One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					25
Impaired Financing Receivable Related Allowance [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					0
Impaired Financing Receivable Related Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	27		27		27
Impaired Financing Receivable Recorded Investment With No Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	155		155		166
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	36		36		52
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	44		44		31
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	1		1		1
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	81		81		84
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	32		32		37
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	32		32		37
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	12		12		12
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	0		0		0
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	29		29		32
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	1		1		1
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	42		42		45
Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					$ 88
Average recorded investment	108		96
Interest income recognized	$ 1		$ 2
Commercial and Industrial Sector [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Average recorded investment		138		126
Interest income recognized		$ 0		$ 0

Loans And Allowance For Cred_11

Loans And Allowance For Credit Losses (Summary Of Selected Information On TDRs That Includes Recorded Investment On An Accruing And Nonaccruing Basis By Loan Class And Modification Type) (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2019		Jun. 30, 2018	Jun. 30, 2019		Jun. 30, 2018	Dec. 31, 2018
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 4		$ 8	$ 8		$ 9
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3		5	6		5
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		1
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3		5	6		6
Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		2	1		2
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		0
Recorded investment resulting from the following modification types		97			97			$ 112
Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		0
Recorded investment resulting from the following modification types		29			29			28
Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		0
Recorded investment resulting from the following modification types		14			14			21
Accruing [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Accruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		0
Recorded investment resulting from the following modification types		43			43			49
Accruing [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Accruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		0
Recorded investment resulting from the following modification types		8			8			11
Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		8			8			11
Accruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		33			33			39
Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1			1
Accruing [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		46			46			52
Accruing [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		12			12			12
Accruing [Member] | Interest Rate Below Market [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		8			8			8
Accruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								3
Accruing [Member] | Interest Rate Below Market [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		6			6			5
Accruing [Member] | Interest Rate Below Market [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								2
Accruing [Member] | Interest Rate Below Market [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1			2
Accruing [Member] | Interest Rate Below Market [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1			1
Accruing [Member] | Maturity Or Team Extension [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		11			11			11
Accruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								2
Accruing [Member] | Maturity Or Team Extension [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		5			5			6
Accruing [Member] | Maturity Or Team Extension [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								2
Accruing [Member] | Maturity Or Team Extension [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2			2			2
Accruing [Member] | Maturity Or Team Extension [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		4			4			3
Accruing [Member] | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		13			13			14
Accruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								0
Accruing [Member] | Principal Forgiveness [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Accruing [Member] | Principal Forgiveness [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								0
Accruing [Member] | Principal Forgiveness [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Accruing [Member] | Principal Forgiveness [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		13			13			14
Accruing [Member] | Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1			2
Accruing [Member] | Payment Deferral [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								0
Accruing [Member] | Payment Deferral [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Accruing [Member] | Payment Deferral [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								1
Accruing [Member] | Payment Deferral [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1			1
Accruing [Member] | Payment Deferral [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			1
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	18			18			18
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								2
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	17			17			17
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	0			0			0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	1			1			1
Accruing [Member] | Multiple Modification Types [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	46			46			59
Accruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								14
Accruing [Member] | Multiple Modification Types [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	15			15			21
Accruing [Member] | Multiple Modification Types [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								6
Accruing [Member] | Multiple Modification Types [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	4			4			6
Accruing [Member] | Multiple Modification Types [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	27			27			32
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		4		8	8		9
Recorded investment resulting from the following modification types		176			176			202
Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3		5	6		5
Recorded investment resulting from the following modification types		34			34			45
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		1
Recorded investment resulting from the following modification types		14			14			14
Nonaccruing [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1			1
Nonaccruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3		5	6		6
Recorded investment resulting from the following modification types		49			49			60
Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		$ 2	1		$ 2
Recorded investment resulting from the following modification types		19			19			20
Nonaccruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		19			19			20
Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		9			9			9
Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		11			11			10
Nonaccruing [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		79			79			90
Nonaccruing [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2			2			1
Nonaccruing [Member] | Interest Rate Below Market [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		18			18			18
Nonaccruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								6
Nonaccruing [Member] | Interest Rate Below Market [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		7			7			7
Nonaccruing [Member] | Interest Rate Below Market [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								3
Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		3			3			3
Nonaccruing [Member] | Interest Rate Below Market [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		10			10			10
Nonaccruing [Member] | Maturity Or Team Extension [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		17			17			17
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		6			6			6
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		6			6			6
Nonaccruing [Member] | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		15			15			16
Nonaccruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								0
Nonaccruing [Member] | Principal Forgiveness [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								0
Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Nonaccruing [Member] | Principal Forgiveness [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								0
Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Nonaccruing [Member] | Principal Forgiveness [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2			2			2
Nonaccruing [Member] | Principal Forgiveness [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2			2			2
Nonaccruing [Member] | Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		5			5			6
Nonaccruing [Member] | Payment Deferral [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								1
Nonaccruing [Member] | Payment Deferral [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								0
Nonaccruing [Member] | Payment Deferral [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1			2
Nonaccruing [Member] | Payment Deferral [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								2
Nonaccruing [Member] | Payment Deferral [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2			2			2
Nonaccruing [Member] | Payment Deferral [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1			0
Nonaccruing [Member] | Payment Deferral [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		4			4			4
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	24			24			45
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]							2
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	2			2			12
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]							14
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	3			3			14
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	1			1			1
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	6			6			27
Nonaccruing [Member] | Multiple Modification Types [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	97			97			100
Nonaccruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]							5
Nonaccruing [Member] | Multiple Modification Types [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types								1
Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	33			33			33
Nonaccruing [Member] | Multiple Modification Types [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]							1
Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	11			11			1
Nonaccruing [Member] | Multiple Modification Types [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	7			7			7
Nonaccruing [Member] | Multiple Modification Types [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	51			51			41
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2			2			2
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		4			4
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1			1
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		4			4			4
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2			2
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1			2
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1			0
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2			2			1
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		6			6			6
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		7			7			8
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			1
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		14	[1]		14	[1]		15
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	3			3
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	0			0
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	0			0
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1	[1]		1	[1]		1
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0	[1]		0	[1]		0
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0	[1]		0	[1]		0
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		9	[2]		9	[2]		7
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	6			6
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	0			0
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	4			4
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		24	[2]		24	[2]		28
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0	[2]		0	[2]		1
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		3	[2]		3	[2]		3
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1			1
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		6			6
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		3			3
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		5			5			6
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1			1
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1			1
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1			1
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2			2
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1			0
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0			0
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	1			1			10
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	1			1
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	3			3
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	1			1			1
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	0			0			0
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	26			26			27
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	6			6
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1			1
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	11			11
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	6			6			7
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	$ 1			$ 1			$ 0
[1]	1 Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.
[2]	2 Includes TDRs that resulted from a combination of any of the previous modification types.

Loans And Allowance For Cred_12

Loans And Allowance For Credit Losses (Summary Of Net Financial Impact On Interest Income Due To Interest Rate Modifications Below Market For Accruing TDR Loans) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 4	$ 8	$ 8	$ 9
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	1
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	3	5	6	6
Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	2	1	2
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	4	8	8	9
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	1
Nonaccruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	3	5	6	6
Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	2	1	2
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Accruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Accruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0	$ 0	$ 0

Loans And Allowance For Cred_13

Loans And Allowance For Credit Losses (Schedule Of Investment Of Accruing And Nonaccruing Loans Modified As Troubled Debt Restructurings) (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2019		Jun. 30, 2018	Jun. 30, 2019		Jun. 30, 2018	Dec. 31, 2018
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 4		$ 8	$ 8		$ 9
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		0
Financing Receivable, Modifications, Recorded Investment		97			97			$ 112
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		4		8	8		9
Financing Receivable, Modifications, Recorded Investment		176			176			202
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3		5	6		5
Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		0
Financing Receivable, Modifications, Recorded Investment		29			29			28
Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3		5	6		5
Financing Receivable, Modifications, Recorded Investment		34			34			45
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		1
Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		0
Financing Receivable, Modifications, Recorded Investment		14			14			21
Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		1
Financing Receivable, Modifications, Recorded Investment		14			14			14
Municipal [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1			1
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3		5	6		6
Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		0
Financing Receivable, Modifications, Recorded Investment		43			43			49
Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3		5	6		6
Financing Receivable, Modifications, Recorded Investment		49			49			60
Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		2	1		2
Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0	0		0
Financing Receivable, Modifications, Recorded Investment		8			8			11
Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		$ 2	1		$ 2
Financing Receivable, Modifications, Recorded Investment		19			19			20
Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		8			8			11
Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		19			19			20
Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		12			12			12
Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2			2			1
One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		33			33			39
One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		9			9			9
Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1			1
Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		11			11			10
Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		46			46			52
Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		79			79			90
Interest Rate Below Market [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		8			8			8
Interest Rate Below Market [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		18			18			18
Interest Rate Below Market [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								3
Interest Rate Below Market [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								6
Interest Rate Below Market [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Interest Rate Below Market [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		6			6			5
Interest Rate Below Market [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		7			7			7
Interest Rate Below Market [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Interest Rate Below Market [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								2
Interest Rate Below Market [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								3
Interest Rate Below Market [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1			2
Interest Rate Below Market [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3			3			3
Interest Rate Below Market [Member] | Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Interest Rate Below Market [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1			1
Interest Rate Below Market [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		10			10			10
Maturity Or Team Extension [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		11			11			11
Maturity Or Team Extension [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		17			17			17
Maturity Or Team Extension [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								2
Maturity Or Team Extension [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Maturity Or Team Extension [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Maturity Or Team Extension [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		5			5			6
Maturity Or Team Extension [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		6			6			6
Maturity Or Team Extension [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Maturity Or Team Extension [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								2
Maturity Or Team Extension [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Maturity Or Team Extension [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2			2			2
Maturity Or Team Extension [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Maturity Or Team Extension [Member] | Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Maturity Or Team Extension [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4			4			3
Maturity Or Team Extension [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		6			6			6
Principal Forgiveness [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		13			13			14
Principal Forgiveness [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		15			15			16
Principal Forgiveness [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Principal Forgiveness [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Principal Forgiveness [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Principal Forgiveness [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Principal Forgiveness [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Principal Forgiveness [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Principal Forgiveness [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Principal Forgiveness [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Principal Forgiveness [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Principal Forgiveness [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Principal Forgiveness [Member] | Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2			2			2
Principal Forgiveness [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		13			13			14
Principal Forgiveness [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2			2			2
Payment Deferral [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1			2
Payment Deferral [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		5			5			6
Payment Deferral [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Payment Deferral [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								1
Payment Deferral [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Payment Deferral [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Payment Deferral [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1			2
Payment Deferral [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Payment Deferral [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								1
Payment Deferral [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								2
Payment Deferral [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1			1
Payment Deferral [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2			2			2
Payment Deferral [Member] | Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1			0
Payment Deferral [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			1
Payment Deferral [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4			4			4
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	18			18			18
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	24			24			45
Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								2
Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]							2
Other Recorded Investment Resulting From Following Modification [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	17			17			17
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	2			2			12
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Other Recorded Investment Resulting From Following Modification [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Other Recorded Investment Resulting From Following Modification [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]							14
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	0			0			0
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	3			3			14
Other Recorded Investment Resulting From Following Modification [Member] | Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	1			1			1
Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	1			1			1
Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	6			6			27
Multiple Modification Types [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	46			46			59
Multiple Modification Types [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	97			97			100
Multiple Modification Types [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								14
Multiple Modification Types [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]							5
Multiple Modification Types [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								1
Multiple Modification Types [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	15			15			21
Multiple Modification Types [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	33			33			33
Multiple Modification Types [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								0
Multiple Modification Types [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment								6
Multiple Modification Types [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]							1
Multiple Modification Types [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	4			4			6
Multiple Modification Types [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	11			11			1
Multiple Modification Types [Member] | Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	7			7			7
Multiple Modification Types [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	27			27			32
Multiple Modification Types [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	51			51			41
Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1			1
Nonaccruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		6			6
Nonaccruing [Member] | Interest Rate Below Market [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3			3
Nonaccruing [Member] | Interest Rate Below Market [Member] | Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Nonaccruing [Member] | Interest Rate Below Market [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		5			5			6
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Nonaccruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Nonaccruing [Member] | Principal Forgiveness [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Nonaccruing [Member] | Principal Forgiveness [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Nonaccruing [Member] | Principal Forgiveness [Member] | Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1			1
Nonaccruing [Member] | Principal Forgiveness [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1			1
Nonaccruing [Member] | Payment Deferral [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1			1
Nonaccruing [Member] | Payment Deferral [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Nonaccruing [Member] | Payment Deferral [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Nonaccruing [Member] | Payment Deferral [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2			2
Nonaccruing [Member] | Payment Deferral [Member] | Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Nonaccruing [Member] | Payment Deferral [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1			0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	1			1			10
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	1			1
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	3			3
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	0			0			0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	1			1			1
Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	26			26			27
Nonaccruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	6			6
Nonaccruing [Member] | Multiple Modification Types [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1
Nonaccruing [Member] | Multiple Modification Types [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	11			11
Nonaccruing [Member] | Multiple Modification Types [Member] | Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	1			1			0
Nonaccruing [Member] | Multiple Modification Types [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	6			6			7
Accruing [Member] | Interest Rate Below Market [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2			2			2
Accruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4			4
Accruing [Member] | Interest Rate Below Market [Member] | Municipal [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Accruing [Member] | Interest Rate Below Market [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1
Accruing [Member] | Interest Rate Below Market [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Accruing [Member] | Interest Rate Below Market [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1			1
Accruing [Member] | Interest Rate Below Market [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Accruing [Member] | Maturity Or Team Extension [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4			4			4
Accruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1
Accruing [Member] | Maturity Or Team Extension [Member] | Municipal [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Accruing [Member] | Maturity Or Team Extension [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2			2
Accruing [Member] | Maturity Or Team Extension [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2			2			1
Accruing [Member] | Maturity Or Team Extension [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1			2
Accruing [Member] | Maturity Or Team Extension [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1			0
Accruing [Member] | Principal Forgiveness [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Accruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Accruing [Member] | Principal Forgiveness [Member] | Municipal [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Accruing [Member] | Principal Forgiveness [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Accruing [Member] | Principal Forgiveness [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		7			7			8
Accruing [Member] | Principal Forgiveness [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		6			6			6
Accruing [Member] | Principal Forgiveness [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Accruing [Member] | Payment Deferral [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Accruing [Member] | Payment Deferral [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Accruing [Member] | Payment Deferral [Member] | Municipal [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Accruing [Member] | Payment Deferral [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1			1
Accruing [Member] | Payment Deferral [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Accruing [Member] | Payment Deferral [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			1
Accruing [Member] | Payment Deferral [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0			0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		14	[1]		14	[1]		15
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	3			3
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Municipal [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	0			0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	[1]		0	[1]		0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1	[1]		1	[1]		1
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0	[1]		0	[1]		0
Accruing [Member] | Multiple Modification Types [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		9	[2]		9	[2]		7
Accruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	6			6
Accruing [Member] | Multiple Modification Types [Member] | Municipal [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0			0
Accruing [Member] | Multiple Modification Types [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	4			4
Accruing [Member] | Multiple Modification Types [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3	[2]		3	[2]		3
Accruing [Member] | Multiple Modification Types [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		24	[2]		24	[2]		28
Accruing [Member] | Multiple Modification Types [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		$ 0	[2]		$ 0	[2]		$ 1
[1]	1 Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.
[2]	2 Includes TDRs that resulted from a combination of any of the previous modification types.

Loans And Allowance For Cred_14

Loans And Allowance For Credit Losses (Schedule Of Outstanding Balances Of All Required Payments And The Related Carrying Amounts For PCI Loans) (Details) - USD ($) $ in Millions		Jun. 30, 2019	Dec. 31, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		$ 215	$ 175
Financing Receivable, Recorded Investment, Current		48,402	46,539
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		121	89
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		94	86
Loans and Leases Receivable, Gross		48,617	46,714
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		17	10
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	148	145
loans held for sale [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		0	4
Financing Receivable, Recorded Investment, Current		105	89
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0	0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0	4
Loans and Leases Receivable, Gross		105	93
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0	2
Commercial And Industrial [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		63	68
Financing Receivable, Recorded Investment, Current			14,445
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			37
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			31
Loans and Leases Receivable, Gross		14,883	14,513
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			4
Finance Leases Portfolio Segment [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		0	2
Financing Receivable, Recorded Investment, Current			325
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			1
Loans and Leases Receivable, Gross		337	327
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			0
Owner Occupied [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		57	40
Financing Receivable, Recorded Investment, Current			7,621
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			23
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			17
Loans and Leases Receivable, Gross		7,828	7,661
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			3
Municipal [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		1	0
Financing Receivable, Recorded Investment, Current			1,661
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			0
Loans and Leases Receivable, Gross		2,059	1,661
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			0
Commercial Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		121	110
Financing Receivable, Recorded Investment, Current		24,986	24,052
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		69	61
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		52	49
Loans and Leases Receivable, Gross		25,107	24,162
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		10	7
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	101	96
Commercial Real Estate Portfolio Segment [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		29	1
Financing Receivable, Recorded Investment, Current			2,185
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			0
Loans and Leases Receivable, Gross		2,609	2,186
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			0
Term [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		16	15
Financing Receivable, Recorded Investment, Current			8,924
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			4
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			11
Loans and Leases Receivable, Gross		9,218	8,939
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			1
Commercial Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		45	16
Financing Receivable, Recorded Investment, Current		11,782	11,109
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		33	5
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		12	11
Loans and Leases Receivable, Gross		11,827	11,125
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		5	1
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	24	26
Home Equity Line of Credit [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		10	10
Financing Receivable, Recorded Investment, Current			2,927
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			4
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			6
Loans and Leases Receivable, Gross		2,929	2,937
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			0
One Through Four Family Residential [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		29	33
Financing Receivable, Recorded Investment, Current			7,143
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			15
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			18
Loans and Leases Receivable, Gross		7,440	7,176
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			0
Construction And Other Consumer Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		4	1
Financing Receivable, Recorded Investment, Current			642
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			0
Loans and Leases Receivable, Gross		644	643
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			0
Revolving Credit Facility [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		5	4
Financing Receivable, Recorded Investment, Current			487
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			2
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			2
Loans and Leases Receivable, Gross		502	491
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			2
Consumer Portfolio Segment [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		1	1
Financing Receivable, Recorded Investment, Current			179
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			0
Loans and Leases Receivable, Gross		168	180
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			0
Consumer Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		49	49
Financing Receivable, Recorded Investment, Current		11,634	11,378
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		19	23
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		30	26
Loans and Leases Receivable, Gross		11,683	11,427
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		2	2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	$ 23	$ 23
[1]	1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

Derivative Instruments And He_3

Derivative Instruments And Hedging Activities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2019	Jul. 31, 2019	Dec. 31, 2018	Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Receive-fixed Swaps, Notional Amounts	$ 100		$ 100
Receive-fixed Swaps, Notional Amounts, Aggregate	400		400
Cash Flow Floor, Notional Amounts	$ 500		$ 500
Cash Flow Floor, Strike Rate	1.50%		1.50%
Cash Flow Floor, Term		3 years
Cash Flow Floor, Purchased	$ 1.4		$ 8
Cash Flow Hedge Swap Portfolio, Change	26
Fair Value Hedge Swap Portfolio, Change	$ 12
Derivative, Fixed Interest Rate	3.35%		3.35%
Senior Notes	$ 1,149		$ 1,149		$ 637
Derivative, Notional Amount, Strike Rate	1.00%		1.00%
Derivative, Fixed Interest Rate 3.5%	3.50%		3.50%
Derivative, Average Fixed Interest Rate	3.425%		3.425%
Derivative, Average Remaining Maturity		2 years 8 months 12 days	2 years 9 months 18 days
Derivative, Average Fixed Interest Rate 2.08%	2.10%		2.10%
Common Stock and Additional Paid-in Capital	$ 3,300		$ 3,300
Cash collateral pledged for derivative liabilities	64		64
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion			2
Change In Fair Value Of Derivative Asset By Credit Value Adjustment	(11)		(11)		(3)	$ (1)
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities						$ 2
Senior Notes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Senior Notes	500		500
Derivatives Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	6,163		6,163		1,187
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gross amounts recognized	14		14		39
Fair Value Hedging [Member] | Interest Rate Swap [Member] | Derivatives Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	1,000		1,000		500
Cash Flow Hedging [Member] | Interest Rate Floor [Member] | Derivatives Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	3,500		3,500		0
Cash Flow Hedging [Member] | Interest Rate Floor [Member] | Derivatives Designated As Hedging Instruments [Member] | Subsequent Event [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount				$ 7,000
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Derivatives Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Interest Rate Swaps, Notional Amount	1,700		1,700
Derivative, Notional Amount	$ 1,663		$ 1,663		$ 687

Notional and Recorded Fair Valu

Notional and Recorded Fair Values (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Other Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 172	$ 75
Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	155	76
Other Debt Obligations [Member]
Derivative [Line Items]
Derivative, Notional Amount	13,960	7,528
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount	6,163	1,187
Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	26	0
Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	0	0
Designated as Hedging Instrument [Member] | Interest Rate Floor [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	3,500	0
Designated as Hedging Instrument [Member] | Interest Rate Floor [Member] | Other Assets [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	26	0
Designated as Hedging Instrument [Member] | Interest Rate Floor [Member] | Other Liabilities [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	0	0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,663	687
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,000	500
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Assets [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Assets [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Liabilities [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	0	0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Liabilities [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	0	0
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Derivative, Notional Amount	7,797	6,341
Derivatives Not Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	146	75
Derivatives Not Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	155	76
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member]
Derivative [Line Items]
Derivative, Notional Amount	366	389
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member] | Other Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	3	4
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	2	2
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	570	300
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	2	1
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	1	1
Derivatives Not Designated As Hedging Instruments [Member] | Offsetting Interest Rate Derivatives [Member]
Derivative [Line Items]
Derivative, Notional Amount	3,451	2,826
Derivatives Not Designated As Hedging Instruments [Member] | Offsetting Interest Rate Derivatives [Member] | Other Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	3	33
Derivatives Not Designated As Hedging Instruments [Member] | Offsetting Interest Rate Derivatives [Member] | Other Assets [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	3	33
Derivatives Not Designated As Hedging Instruments [Member] | Offsetting Interest Rate Derivatives [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	149	40
Derivatives Not Designated As Hedging Instruments [Member] | Offsetting Interest Rate Derivatives [Member] | Other Liabilities [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	8	3
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member]
Derivative [Line Items]
Derivative, Notional Amount	3,410	2,826
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	138	37
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Assets [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	136	7
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	3	33
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Liabilities [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities	$ 3	$ 33

Derivative gain (loss) recogniz

Derivative gain (loss) recognized/reclassified (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 26	$ (2)	$ 35	$ (7)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, before Tax	15	0	18	0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(2)	(1)	(4)	(2)
Derivative Instrument, Noninterest Income (Expense)	6	9	12	24
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	0	0	0	0
Derivatives Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	26	(2)	35	(7)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, before Tax	15	0	18	0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(2)	(1)	(4)	(2)
Derivative Instrument, Noninterest Income (Expense)	0	0	0	0
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	0	0	0	0
Derivatives Designated As Hedging Instruments [Member] | Cash Flow Hedging [Member] | Interest Rate Floor [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	2	0	2	0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, before Tax	15	0	18	0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(1)	0	(1)	0
Derivative Instrument, Noninterest Income (Expense)	0	0	0	0
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	0	0	0	0
Derivatives Designated As Hedging Instruments [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	24	(2)	33	(7)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, before Tax	0	0	0	0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(1)	(1)	(3)	(2)
Derivative Instrument, Noninterest Income (Expense)	0	0	0	0
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	0	0	0	0
Derivatives Designated As Hedging Instruments [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	0	0	0	0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, before Tax	0	0	0	0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	0	0	0
Derivative Instrument, Noninterest Income (Expense)	0	0	0	0
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	0	0	0	0
Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instrument, Noninterest Income (Expense)	6	9	12	24
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instrument, Noninterest Income (Expense)	6	5	11	10
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instrument, Noninterest Income (Expense)	(1)	0	(1)	0
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instrument, Noninterest Income (Expense)	86	(14)	132	(43)
Derivatives Not Designated As Hedging Instruments [Member] | Offsetting Interest Rate Derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instrument, Noninterest Income (Expense)	$ (85)	$ 18	$ (130)	$ 57

Gain (loss) recorded in income

Gain (loss) recorded in income (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Summary of Derivative Instruments [Abstract]
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge	$ (12)	$ 0
Types of Items Hedged by Interest Rate Derivatives	$12	$—
Derivatives, Gain (Loss) on Derivative, Net	$ 0	$ 0

Long-term debt hedged items (De

Long-term debt hedged items (Details) - Fair Value Hedging [Member] - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Liability, Fair Value Hedge	$ (1,022)	$ (505)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	$ (22)	$ (5)

Leases (Narrative) (Details)

Leases (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)BranchesnumberOfBranches	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)BranchesnumberOfBranches	Jun. 30, 2018USD ($)
Leases [Abstract]
Number of Branches | Branches	432		432
Number of Branches Owned | numberOfBranches	277		277
Number of Branches Leased | numberOfBranches	155		155
Operating Lease, Right-of-Use Asset	$ 232		$ 232
Finance Lease, Right-of-Use Asset	1		1
Operating Lease, Liability	$ 251		$ 251
Operating Lease, Weighted Average Remaining Lease Term	9 years 3 months 18 days		9 years 3 months 18 days
Finance Lease, Weighted Average Remaining Lease Term	10 months 24 days		10 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	3.20%		3.20%
Finance Lease, Weighted Average Discount Rate, Percent	12.60%		12.60%
Operating Lease, Cost	$ 12		$ 24
Variable Lease, Cost	13		26
Lease, Cost	25		50
Operating Cash Disbursement From Operating Leases	12		24
Lease Liabilities, Maturity One Year	32		32
Liabilities	47		47
Lease Liabilities, Maturity Year Three	42		42
Lease Liabilities, Maturity Year Four	37		37
Lease Liabilities, Maturity Year Five	31		31
Lease Liabilities, Maturity Year Thereafter	116		116
Lease Liabilities, Maturity	305		305
Operating Lease, Lease Income	3	$ 3	6	$ 5
Sales-type and Direct Financing Leases, Lease Receivable	337	358	337	358
Sales-type and Direct Financing Leases, Profit (Loss)	$ 3	$ 3	$ 7	$ 7

Debt (Narrative) (Details)

Debt (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Debt Instruments [Abstract]
Senior Notes	$ 1,149	$ 637
Debt Instrument, Interest Rate Terms	3.35%

Shareholders' Equity (Narrative

Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Additional Paid-in Capital	$ 3,271	$ 3,271		$ 3,271	$ 3,806
Common Stock and Additional Paid-in Capital Percentage Change	14.00%	14.00%		14.00%
Common Stock and Additional Paid-in Capital Change	$ 535	$ 535		$ 535
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 25	$ 25	$ (315)	$ 25	$ (250)	$ (139)
Stock Repurchased During Period, Shares		5,800,000	4,300,000	11,300,000
Shares, Issued	176,900,000	176,900,000		176,900,000
Treasury Stock Acquired, Average Cost Per Share		$ 47.05	$ 54.64	$ 48.50
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 275	$ 275		$ 275
Common Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001		$ 0.001
Stock Repurchased and Retired During Period, Value		$ 275	$ 235	$ 550
Common Stock, Terms of Conversion	1.06
Warrant [Member]
Warrant Exercise Price	$ 34.41	$ 34.41		$ 34.41
Class of Warrant or Right, Outstanding	29,300,000	29,300,000		29,300,000

Long-term Debt (Details)

Long-term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Debt Instruments [Abstract]
Long-term Debt, Gross	$ 1,236	$ 724
Senior Notes	1,149	637
Subordinated Debt	$ 87	$ 87

Changes In Accumulated Other Co

Changes In Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 25	$ (315)	$ 25	$ (315)	$ (250)	$ (139)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			273	(177)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(2)	(1)
Other comprehensive income (loss)	148	(49)	275	(176)
Other Comprehensive Income (Loss), Tax			90	(58)
Other Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	9	(289)	9	(289)	228	(114)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			237	(175)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0	0
Other comprehensive income (loss)			237	(175)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax			78	(58)
Other Pension, Postretirement and Supplemental Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	37	(3)	37	(3)	(1)	(2)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			36	(2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(2)	(1)
Other comprehensive income (loss)			38	(1)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax			12	0
Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (21)	$ (23)	(21)	(23)	$ (21)	$ (23)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0	0
Other comprehensive income (loss)			0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax			$ 0	$ 0

Amounts Reclassified from AOCI

Amounts Reclassified from AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income taxes	$ 58	$ 56	$ 119	$ 126
Interest Rate Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, Current Period, Tax	(1)	(1)	(2)	(1)
Gain (Loss) on Derivative Instruments, Net, Pretax	(2)	(1)	(4)	(2)
Income taxes	$ (1)	$ 0	$ (2)	$ (1)

Commitments, Guarantees, And _3

Commitments, Guarantees, And Contingent Liabilities (Narrative) (Details) $ in Millions	Jun. 30, 2019USD ($)
Guarantor Obligations [Line Items]
Letters of credit, accrued liability	$ 4
Reserve for unfunded lending commitments	1
Deferred commitment fees	3
Minimum [Member]
Guarantor Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	0
Maximum [Member]
Guarantor Obligations [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 45

Commitments, Guarantees, And _4

Commitments, Guarantees, And Contingent Liabilities (Schedule Of Guarantees Issued) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Unused Commitments to Extend Credit	$ 22,529	$ 21,454
Commercial Letters Of Credit	19	18
Total Unfunded Lending Commitments	23,264	22,326
Financial [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	527	655
Performance [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	189	$ 199
Minimum [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Loss Contingency, Estimate of Possible Loss	0
Maximum [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 45

Other Service charges, commissi

Other Service charges, commissions and fees (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Service charges, commissions and fees [Line Items]
Other service charges, commissions, and fees	$ 58	$ 55	$ 113	$ 110
Revenue Recognition [Member]
Other Service charges, commissions and fees [Line Items]
Other Service Charges	3	4	7	7
Other service charges, commissions, and fees	$ 45	$ 46	$ 88	$ 89

Revenue Recognition and Deferre

Revenue Recognition and Deferred Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]
Service Charges and Fees on Deposit Accounts	$ 41	$ 42	$ 81	$ 84
Other service charges, commissions, and fees	58	55	113	110
Wealth Management and Trust Income	13	14	26	25
Capital Market and Foreign Exchange Gain (Loss)	9	7	16	15
Noninterest income, Customer-related Fees	130	125	250	247
Noninterest Income	132	138	264	276
Net interest income	569	548	1,145	1,090
Gains (losses) from fair value changes	(9)	(1)	(9)	(6)
Consolidated Entities [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Service Charges and Fees on Deposit Accounts	41	42	81	84
Other service charges, commissions, and fees	46	46	88	89
Wealth Management and Trust Income	13	13	26	25
Capital Market and Foreign Exchange Gain (Loss)	2	3	5	6
Other Noninterest Income From Contracts With Customers			1	1
Total non-interest income from contracts with customers (ASC 606)	102	104	201	205
Other non-interest income (Non-ASC 606 customer related)	28	21	49	42
Noninterest income, Customer-related Fees	130	125	250	247
Other non-interest income (non-customer related)	2	13	14	29
Noninterest Income	132	138	264	276
Gains (Losses) on Sales of Other Real Estate	0	0	2	1
Net interest income	569	548	1,145	1,090
Revenues	701	686	1,411	1,367
Zions Bank [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Service Charges and Fees on Deposit Accounts	14	15	27	29
Other service charges, commissions, and fees	18	18	36	35
Wealth Management and Trust Income	4	4	8	7
Capital Market and Foreign Exchange Gain (Loss)	2	1	3	3
Other Noninterest Income From Contracts With Customers			0	0
Total non-interest income from contracts with customers (ASC 606)	38	38	74	74
Other non-interest income (Non-ASC 606 customer related)	1	0	(2)	(1)
Noninterest income, Customer-related Fees	39	38	72	73
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	39	38	72	73
Gains (Losses) on Sales of Other Real Estate	0	0	1	0
Net interest income	179	176	358	342
Revenues	218	214	431	415
Amegy Corporation [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Service Charges and Fees on Deposit Accounts	11	11	22	22
Other service charges, commissions, and fees	9	9	18	19
Wealth Management and Trust Income	3	3	5	5
Capital Market and Foreign Exchange Gain (Loss)	(2)	(1)	(3)	(3)
Other Noninterest Income From Contracts With Customers			0	0
Total non-interest income from contracts with customers (ASC 606)	21	22	42	43
Other non-interest income (Non-ASC 606 customer related)	13	9	26	21
Noninterest income, Customer-related Fees	34	31	68	64
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	34	31	68	64
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Net interest income	132	127	263	254
Revenues	166	158	331	318
California Bank Trust [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Service Charges and Fees on Deposit Accounts	7	7	14	14
Other service charges, commissions, and fees	7	6	13	12
Wealth Management and Trust Income	1	1	2	2
Capital Market and Foreign Exchange Gain (Loss)	1	1	2	2
Other Noninterest Income From Contracts With Customers			0	0
Total non-interest income from contracts with customers (ASC 606)	16	15	31	30
Other non-interest income (Non-ASC 606 customer related)	6	4	10	8
Noninterest income, Customer-related Fees	22	19	41	38
Other non-interest income (non-customer related)	0	0	0	2
Noninterest Income	22	19	41	40
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Net interest income	140	131	278	262
Revenues	162	150	319	302
National Bank Of Arizona [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Service Charges and Fees on Deposit Accounts	3	3	6	6
Other service charges, commissions, and fees	3	3	6	6
Wealth Management and Trust Income	0	0	1	1
Capital Market and Foreign Exchange Gain (Loss)	0	0	0	0
Other Noninterest Income From Contracts With Customers			0	0
Total non-interest income from contracts with customers (ASC 606)	6	6	13	13
Other non-interest income (Non-ASC 606 customer related)	4	3	6	4
Noninterest income, Customer-related Fees	10	9	19	17
Other non-interest income (non-customer related)	1	1	2	2
Noninterest Income	11	10	21	19
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Net interest income	62	58	122	111
Revenues	73	68	143	130
Nevada State Bank [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Service Charges and Fees on Deposit Accounts	4	4	7	8
Other service charges, commissions, and fees	3	3	6	6
Wealth Management and Trust Income	1	1	2	2
Capital Market and Foreign Exchange Gain (Loss)	0	0	1	0
Other Noninterest Income From Contracts With Customers			0	0
Total non-interest income from contracts with customers (ASC 606)	8	8	16	16
Other non-interest income (Non-ASC 606 customer related)	3	2	5	4
Noninterest income, Customer-related Fees	11	10	21	20
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	11	10	21	20
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Net interest income	40	38	80	73
Revenues	51	48	101	93
Vectra Bank Colorado [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Service Charges and Fees on Deposit Accounts	2	2	4	4
Other service charges, commissions, and fees	2	2	3	3
Wealth Management and Trust Income	0	0	1	1
Capital Market and Foreign Exchange Gain (Loss)	0	0	0	0
Other Noninterest Income From Contracts With Customers			0	0
Total non-interest income from contracts with customers (ASC 606)	4	4	8	8
Other non-interest income (Non-ASC 606 customer related)	2	2	4	4
Noninterest income, Customer-related Fees	6	6	12	12
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	6	6	12	12
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Net interest income	36	34	72	66
Revenues	42	40	84	78
Commerce Bank Of Washington [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Service Charges and Fees on Deposit Accounts	0	0	1	1
Other service charges, commissions, and fees	1	1	1	1
Wealth Management and Trust Income	0	0	0	0
Capital Market and Foreign Exchange Gain (Loss)	0	0	0	0
Other Noninterest Income From Contracts With Customers			0	0
Total non-interest income from contracts with customers (ASC 606)	1	1	2	2
Other non-interest income (Non-ASC 606 customer related)	0	0	0	1
Noninterest income, Customer-related Fees	1	1	2	3
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	1	1	2	3
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Net interest income	14	12	28	24
Revenues	15	13	30	27
Other Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Service Charges and Fees on Deposit Accounts	0	0	0	0
Other service charges, commissions, and fees	3	4	5	7
Wealth Management and Trust Income	4	4	7	7
Capital Market and Foreign Exchange Gain (Loss)	1	2	2	4
Other Noninterest Income From Contracts With Customers			1	1
Total non-interest income from contracts with customers (ASC 606)	8	10	15	19
Other non-interest income (Non-ASC 606 customer related)	(1)	1	0	1
Noninterest income, Customer-related Fees	7	11	15	20
Other non-interest income (non-customer related)	1	12	12	25
Noninterest Income	8	23	27	45
Gains (Losses) on Sales of Other Real Estate	0	0	1	1
Net interest income	(34)	(28)	(56)	(42)
Revenues	$ 26	$ (5)	$ (28)	$ 4

Retirement Plans (Schedule Of N

Retirement Plans (Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans) (Details) - Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1	$ 1	$ 3	$ 3
Expected return on plan assets	(2)	(3)	(4)	(6)
Amortization of net actuarial (gain) loss	1	1	1	1
Net periodic benefit cost (credit)	0	(1)	0	(1)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ 0	$ 0	$ 0	$ 1

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Percent	22.70%	22.10%	22.50%	22.50%
Deferred Tax Assets, Net	$ 36		$ 36		$ 130

Basic and diluted net earnings

Basic and diluted net earnings per common share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income for the period	$ 198	$ 197	$ 411	$ 435
Undistributed Earnings Applicable to Nonvested Shares	1	1	2	3
Dividends	63	57	127	104
Undistributed Earnings, Basic	135	140	284	331
Undistributed Earnings (Loss) Available to Common Shareholders, Diluted	134	139	282	328
Distributed Earnings	54	47	110	86
Net Income (Loss) Available to Common Stockholders, Diluted	$ 188	$ 186	$ 392	$ 414
Weighted Average Number of Shares Outstanding, Basic	179,156	195,583	181,946	196,149
Earnings Per Share, Basic	$ 1.05	$ 0.95	$ 2.15	$ 2.11
Dilutive Effect of Common Stock Warrants	9,318	12,640	9,587	12,627
Dilutive Effect of Stock Options	624	1,024	673	1,083
Weighted Average Number of Shares Outstanding, Diluted	189,098	209,247	192,206	209,859
Earnings Per Share, Diluted	$ 0.99	$ 0.89	$ 2.04	$ 1.97

Stock awards that were anti-dil

Stock awards that were anti-dilutive (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	492	194	411	120
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,446	1,709	1,435	1,733

Operating Segment Information_2

Operating Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)Branches	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)Branches	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Segment Reporting Information [Line Items]
Number of community regional banks operating in distinct geographical areas	7		7
Net interest income	$ 569	$ 548	$ 1,145	$ 1,090
Provision for loan losses	20	5	22	(35)
Interest Income (Expense), after Provision for Loan Loss	548	536	1,120	1,125
Noninterest Income, Other Operating Income	(4)	1	(2)	6
Total Noninterest Expense	424	421	854	840
Income Before Income Taxes	$ 256	253	$ 530	561
Number of Branches | Branches	432		432
Investment Securities Gross Unrealized Losses Less Than 12 Months	$ 2		$ 2		$ 40
Investment Securities Estimated Fair Value Less Than 12 Months	163		163		2,858
Investment Securities Gross Unrealized Losses 12 Months or More	108		108		297
Investment Securities Estimated Fair Value 12 Months or More	7,020		7,020		9,375
Investment Securities Gross Unrealized Losses Total	110		110		337
Investment Securities Estimated Fair Value Total	7,183		7,183		12,233
Zions Bank [Member]
Segment Reporting Information [Line Items]
Net interest income	179	176	358	342
Provision for loan losses	16	(5)	26	(3)
Interest Income (Expense), after Provision for Loan Loss	163	171	332	339
Noninterest Income, Other Operating Income	39	38	72	73
Total Noninterest Expense	120	117	237	231
Income Before Income Taxes	82	92	167	181
Average Loans And Leases	13,067	12,633	13,004	12,543
Average Deposits	15,455	15,346	15,490	15,211
Amegy Corporation [Member]
Segment Reporting Information [Line Items]
Net interest income	132	127	263	254
Provision for loan losses	8	6	23	59
Interest Income (Expense), after Provision for Loan Loss	140	133	286	313
Noninterest Income, Other Operating Income	34	31	68	64
Total Noninterest Expense	86	86	174	173
Income Before Income Taxes	88	78	180	204
Average Loans And Leases	12,254	11,387	12,058	11,379
Average Deposits	11,361	11,060	11,401	10,938
National Bank Of Arizona [Member]
Segment Reporting Information [Line Items]
Net interest income	62	58	122	111
Provision for loan losses	2	7	4	9
Interest Income (Expense), after Provision for Loan Loss	60	51	118	102
Noninterest Income, Other Operating Income	11	10	21	19
Total Noninterest Expense	38	38	78	75
Income Before Income Taxes	33	23	61	46
Average Loans And Leases	4,847	4,640	4,798	4,591
Average Deposits	5,048	4,942	4,972	4,863
Commerce Bank Of Washington [Member]
Segment Reporting Information [Line Items]
Net interest income	14	12	28	24
Provision for loan losses	2	1	2	2
Interest Income (Expense), after Provision for Loan Loss	12	11	26	22
Noninterest Income, Other Operating Income	1	1	2	3
Total Noninterest Expense	5	5	11	11
Income Before Income Taxes	8	7	17	14
Average Loans And Leases	1,203	1,117	1,156	1,135
Average Deposits	1,053	1,048	1,064	1,060
California Bank Trust [Member]
Segment Reporting Information [Line Items]
Net interest income	140	131	278	262
Provision for loan losses	9	2	12	5
Interest Income (Expense), after Provision for Loan Loss	131	129	266	257
Noninterest Income, Other Operating Income	22	19	41	40
Total Noninterest Expense	82	76	164	154
Income Before Income Taxes	71	72	143	143
Average Loans And Leases	10,838	9,908	10,707	9,919
Average Deposits	11,412	11,181	11,328	11,150
Nevada State Bank [Member]
Segment Reporting Information [Line Items]
Net interest income	40	38	80	73
Provision for loan losses	0	0	(1)	0
Interest Income (Expense), after Provision for Loan Loss	40	38	81	73
Noninterest Income, Other Operating Income	11	10	21	20
Total Noninterest Expense	37	36	73	72
Income Before Income Taxes	14	12	29	21
Average Loans And Leases	2,570	2,349	2,535	2,349
Average Deposits	4,406	4,314	4,368	4,269
Vectra Bank Colorado [Member]
Segment Reporting Information [Line Items]
Net interest income	36	34	72	66
Provision for loan losses	1	2	5	5
Interest Income (Expense), after Provision for Loan Loss	35	32	67	61
Noninterest Income, Other Operating Income	6	6	12	12
Total Noninterest Expense	27	25	54	52
Income Before Income Taxes	14	13	25	21
Average Loans And Leases	3,105	2,881	3,080	2,837
Average Deposits	2,811	2,784	2,816	2,748
Other Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	(34)	(28)	(56)	(42)
Provision for loan losses	1	1	0	0
Interest Income (Expense), after Provision for Loan Loss	(33)	(29)	(56)	(42)
Noninterest Income, Other Operating Income	8	23	27	45
Total Noninterest Expense	29	38	63	72
Income Before Income Taxes	(54)	(44)	(92)	(69)
Average Loans And Leases	440	327	412	301
Average Deposits	$ 2,801	2,221	$ 2,694	2,208
ARIZONA | National Bank Of Arizona [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	58		58
NEVADA | Nevada State Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	50		50
Utah [Member] | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	98		98
Idaho [Member] | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	24		24
WYOMING | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	1		1
Colorado [Member] | Vectra Bank Colorado [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	36		36
New Mexico [Member] | Vectra Bank Colorado [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	1		1
WASHINGTON | Commerce Bank Of Washington [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	2		2
OREGON | Commerce Bank Of Washington [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	1		1
TEXAS | Amegy Corporation [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	74		74
CALIFORNIA | California Bank And Trust [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	87		87
Consolidated Entities [Member]
Segment Reporting Information [Line Items]
Net interest income	$ 569	548	$ 1,145	1,090
Provision for loan losses	21	(12)	25	(35)
Interest Income (Expense), after Provision for Loan Loss	548	536	1,120	1,125
Noninterest Income, Other Operating Income	132	138	264	276
Total Noninterest Expense	424	421	854	840
Income Before Income Taxes	256	253	530	561
Average Loans And Leases	48,324	45,242	47,750	45,054
Average Deposits	54,347	$ 52,896	54,133	$ 52,447
Available-for-sale Securities [Member]
Segment Reporting Information [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2		2		39
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	150		150		2,772
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	106		106		287
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	6,745		6,745		8,937
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	108		108		326
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	6,895		6,895		11,709
Agency Securities [Member]
Segment Reporting Information [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		0		2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	14		14		245
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	5		5		17
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	606		606		913
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	5		5		19
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	620		620		1,158
Agency Guaranteed Mortgage Backed Securities [Member]
Segment Reporting Information [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1		1		16
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	72		72		1,081
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	62		62		224
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	4,535		4,535		6,661
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	63		63		240
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4,607		4,607		7,742
Small Business Administration Loan Backed Securities [Member]
Segment Reporting Information [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1		1		19
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	34		34		1,180
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	39		39		28
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,430		1,430		711
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	40		40		47
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,464		1,464		1,891
US States and Political Subdivisions Debt Securities [Member]
Segment Reporting Information [Line Items]
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	288		288		524
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2		2		10
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		0		1
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	13		13		86
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	275		275		438
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	2		2		11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		0		2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	30		30		266
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0		0		14
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	159		159		641
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0		0		16
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	189		189		907
Available-for-sale, Unrealized losses, Other [Member]
Segment Reporting Information [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0		0		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0		0		4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	15		15		11
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0		0		4
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 15		$ 15		$ 11