Zions Bancorporation, National Association (ZION) 10-Q 8 Aug 18 2018 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 31, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Trading Symbol	zion
Entity Registrant Name	ZIONS BANCORPORATION /UT/
Entity Central Index Key	109,380
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		194,402,811

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) shares in Thousands, $ in Millions	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 468	$ 548
Money market investments:
Interest-bearing deposits	698	782
Federal funds sold and security resell agreements	558	514
Investment securities:
Held-to-maturity, at amortized cost	878	770
Available-for-sale, at fair value	14,627	15,161
Trading account, at fair value	207	148
Total investment securities	15,712	16,079
Loans held for sale	84	44
Loans held for investment, net of allowance
Loans and leases, net of unearned income and fees	45,230	44,780
Less allowance for loan losses	490	518
Loans held for investment, net of allowance	44,740	44,262
Other noninterest-bearing investments	1,054	1,029
Premises, equipment and software, net	1,099	1,094
Goodwill and intangibles	1,015	1,016
Other real estate owned	5	4
Other assets	1,024	916
Total assets	66,457	66,288
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing demand	24,007	23,886
Interest-bearing:
Savings and money market	25,562	25,620
Time	4,011	3,115
Total deposits	53,580	52,621
Federal funds purchased and other short-term borrowings	4,158	4,976
Long-term debt	383	383
Reserve for unfunded lending commitments	58	58
Other liabilities	657	571
Total liabilities	58,836	58,609
Shareholders' equity:
Preferred stock, without par value	566	566
Common stock, without par value	4,231	4,445
Retained earnings	3,139	2,807
Accumulated other comprehensive income (loss)	(315)	(139)
Stockholders' Equity	7,621	7,679
Total liabilities and shareholders' equity	$ 66,457	$ 66,288
Preferred Stock, Shares Authorized	4,400	4,400
Common Stock, Shares Authorized	350,000	350,000
Common Stock, Shares, Issued	195,392	197,532
Common Stock, Shares, Outstanding	195,392	197,532
Fair Value, Inputs, Level 2 [Member]
Investment securities:
Trading account, at fair value	$ 118	$ 148
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]
Interest-bearing:
Long-term debt	$ 383	$ 383

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Preferred Stock, Shares Authorized	4,400	4,400
Common Stock, Shares Authorized	350,000	350,000
Common Stock, Shares, Issued	195,392	197,532
Held-to-maturity, fair value	$ 866
Common stock, outstanding shares	195,392	197,532
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Held-to-maturity, fair value	$ 866	$ 762

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest income:
Interest and Fees and Loans	$ 514	$ 469	$ 1,011	$ 902
Interest on Money Market Investments	7	5	13	9
Interest on Securities	85	84	170	162
Total Interest Income	606	558	1,194	1,073
Interest expense:
Interest on Deposits	29	14	48	28
Interest on short- and long-term borrowings	29	16	56	28
Total Interest Expense	58	30	104	56
Net interest income	548	528	1,090	1,017
Provision for loan losses	5	7	(35)	30
Net interest income after provision for loan losses	543	521	1,125	987
Noninterest income:
Service charges and fees on deposit accounts	42	43	84	85
Other service charges, commissions, and fees	55	56	110	105
Wealth management and trust income	14	10	25	20
Loan Sales and Servicing Income	7	6	13	13
Capital markets and foreign exchange	7	6	15	13
Customer-related Fees	125	121	247	236
Dividends and Other Investment Income	11	10	22	22
Securities Gains, Net	1	2	1	7
Other	1	(1)	6	(1)
Noninterest Income	138	132	276	264
Noninterest expense:
Salaries and Employee Benefits	266	240	535	502
Occupancy, Net	32	32	63	66
Furniture, Equipment, and Software, Net	32	32	65	64
Other real estate expense, net	0	0	(1)	0
Credit-Related Expense	7	8	13	15
Provision for unfunded lending commitments	7	3	0	(2)
Professional and Legal Fees	14	14	26	28
Advertising	7	6	13	11
FDIC Premiums	14	13	26	25
Other	49	57	98	110
Total Noninterest Expense	428	405	840	819
Income Before Income Taxes	253	248	561	432
Income taxes	56	80	126	124
Net income	197	168	435	308
Preferred Stock Dividends	(10)	(12)	(17)	(23)
Preferred Stock Redemption	0	(2)	0	(2)
Net Earnings Available to Common Shareholders	$ 187	$ 154	$ 418	$ 283
Weighted average common shares outstanding during the period:
Weighted Average Number of Shares Outstanding, Basic	195,583	201,822	196,149	202,083
Weighted Average Number of Shares Outstanding, Diluted	209,247	208,183	209,859	209,353
Earnings Per Share, Basic	$ 0.95	$ 0.76	$ 2.11	$ 1.39
Earnings Per Share, Diluted	$ 0.89	$ 0.73	$ 1.97	$ 1.34

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income for the period	$ 197	$ 168	$ 435	$ 308
Other comprehensive income, net of tax:
Unrealized holding gains (losses) on investment securities	(50)	61	(175)	73
Net unrealized gains on other noninterest-bearing investments	2	1	3	2
Net unrealized holding gains (losses) on derivative instruments	0	1	(3)	0
Reclassification adjustment for increase in interest income recognized in earnings on derivatives instruments	(1)	(1)	(1)	(2)
Other comprehensive income (loss)	(49)	62	(176)	73
Comprehensive income	$ 148	$ 230	$ 259	$ 381

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Shareholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity	$ 7,634	$ 710	$ 4,725	$ 2,321	$ (122)
Balance (in shares) at Dec. 31, 2016			203,085
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for the period	308			308
Other comprehensive income, net of tax	73				73
Preferred Stock Redemption	(144)	(144)	$ 2	(2)
Stock Issued During Period, Value, Conversion of Convertible Securities
Stock Repurchased and Retired During Period, Value	(90)		$ (90)
Company Common Stock Repurchased, Shares			(2,158)
Net activity under employee plans and related tax benefits	23		$ 23
Net activity under employee plans and related tax benefits, shares			1,204
Dividends on preferred stock	(23)			(23)
Dividends on common stock	(32)			(32)
Balance (in shares) at Jun. 30, 2017			202,131
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity	7,749	566	$ 4,660	2,572	(49)
Stock Repurchased and Retired During Period, Value	$ 465
Balance (in shares) at Jun. 30, 2018	195,392		195,392
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity	$ 7,679	566	$ 4,445	2,807	(139)
Balance (in shares) at Dec. 31, 2017	197,532		197,532
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for the period	$ 435			435
Other comprehensive income, net of tax	(176)				(176)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	1			1
Stock Repurchased and Retired During Period, Value	$ (235)		$ (235)
Net Shares Issued From Stock Warrant Exercises			1,095
Company Common Stock Repurchased, Shares	4,000		(4,301)
Net activity under employee plans and related tax benefits	$ 21		$ 21
Net activity under employee plans and related tax benefits, shares			1,066
Dividends on preferred stock	(17)			(17)
Dividends on common stock	$ (87)			(87)
Balance (in shares) at Jun. 30, 2018	195,392		195,392
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity	$ 7,621	$ 566	$ 4,231	$ 3,139	$ (315)

Consolidated Statements Of Cha7

Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Common Stock, Dividends, Per Share, Declared	$ 0.44	$ 0.16

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income for the period	$ 197	$ 168	$ 435	$ 308
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	12	10	(35)	28
Depreciation and amortization	49	47	92	84
Share-based Compensation	5	5	18	17
Deferred income tax expense (benefit)	(11)	(5)	2	8
Net decrease (increase) in trading securities	(63)	(22)	(59)	54
Net decrease (increase) in loans held for sale	(1)	53	(34)	89
Change in other liabilities	81	(63)	85	(21)
Change in other assets	(100)	12	(52)	33
Other, net	(6)	(10)	(14)	(24)
Net cash provided by operating activities	163	195	438	576
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in money market investments	157	530	40	385
Proceeds from maturities and paydowns of investment securities held-to-maturity	55	75	114	166
Purchases of investment securities held-to-maturity	(165)	(66)	(222)	(73)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	735	630	1,404	1,160
Purchases of investment securities available-for-sale	(564)	(353)	(1,176)	(3,466)
Net change in loans and leases	(120)	(919)	(431)	(1,036)
Net change in other noninterest-bearing investments	27	(29)	(4)	(103)
Purchases of premises and equipment	(26)	(44)	(54)	(94)
Other, net	1	3	0	8
Net cash provided by (used in) investing activities	100	(173)	(329)	(3,053)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	618	(1,099)	965	(858)
Net change in short-term funds borrowed	(709)	205	1,181	2,015
Proceeds from debt over 90 days and up to one year	0	1,250	0	1,750
Repayments of debt over 90 days and up to one year	0	(250)	(2,000)	(250)
Cash paid for preferred stock redemption	0	144	0	144
Repayment of long-term debt	0	0	0	(153)
Proceeds from Issuance of Common Stock	7	9	17	18
Dividends paid on common and preferred stock	(55)	(26)	(104)	(55)
Company common stock repurchased	(126)	(52)	(248)	(102)
Net cash provided by (used in) financing activities	(265)	(107)	(189)	2,221
Net decrease in cash and due from banks	(2)	(85)	(80)	(256)
Cash and due from banks at beginning of period	470	566	548	737
Cash and due from banks at end of period	468	481	468	481
Cash paid for interest	55	30	100	52
Net cash paid for income taxes	90	128	91	122
Loans Held for Investment Transferred to Other Real Estate Owned	3	2	6	4
Loans Held for Investment Reclassified to Loans Held for Sale, Net	$ (24)	$ (12)	$ (39)	$ (11)

Basis of Presentaion

Basis of Presentaion	6 Months Ended
	Jun. 30, 2018
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 (“the Parent”) and its majority-owned subsidiaries (collectively “the Company,” “Zions,” “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, 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. In certain cases, ASUs are issued jointly with International Financial Reporting Standards. Operating results for the six months ended June 30, 2018 and 2017 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, 2017 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 Company’s 2017 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. Zions Bancorporation is a financial holding company headquartered in Salt Lake City, Utah, which owns and operates a commercial bank. The Parent and its subsidiaries (collectively “the Company”) provide a full range of banking and related services in 11 Western and Southwestern states through 7 separately managed and branded units as follows: Zions Bank, in Utah, Idaho and Wyoming; Amegy Bank (“Amegy”), in Texas; California Bank & Trust (“CB&T”); National Bank of Arizona (“NBAZ”); Nevada State Bank (“NSB”); Vectra Bank Colorado (“Vectra”), in Colorado and New Mexico; and The Commerce Bank of Washington (“TCBW”) which operates under that name in Washington and under the name The Commerce Bank of Oregon in Oregon. The Parent also owns and operates certain nonbank subsidiaries that engage in financial services.

Certain Recent Accounting Prono

Certain Recent Accounting Pronouncements (Notes)	6 Months Ended
	Jun. 30, 2018
Certain Recent Accounting Pronouncements [Abstract]
Certain Recent Accounting Pronouncements [Text Block]	RECENT ACCOUNTING PRONOUNCEMENTS Standard Description Date of adoption Effect on the financial statements or other significant matters Standards not yet adopted by the Company ASU 2016-02, Leases (Topic 842) and subsequent related ASUs The standard requires that a lessee recognize assets and liabilities for leases on the balance sheet. For leases with a term of 12 months or less, however, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee will depend primarily on its classification as a finance or operating lease. The standard also requires disclosures to better understand the amount, timing, and uncertainty of cash flows arising from leases. These disclosures include qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements. January 1, 2019 Upon adoption of the standard, we currently estimate the right-of-use asset to be between $200-$250 million. This estimate may change depending on the Company’s lease activity. The implementation team is working on gathering all key lease data elements to meet the requirements of the new guidance. Additionally, we are implementing new lease software that will accommodate the new accounting requirements. 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 to be amortized to the earliest call date. The update does not change the accounting for securities held at a discount. January 1, 2019 Our analysis suggests this guidance will not have a material impact on the Company’s financial statements, but we will continue to monitor its impact as we move closer to implementation. ASU 2016-13, Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments The standard significantly changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. 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. It also changes the accounting for purchased credit-impaired debt securities and loans. The standard retains many of the current disclosure requirements in US GAAP and expands certain disclosure requirements. Early adoption of the guidance is permitted as of January 1, 2019. January 1, 2020 We have formed an implementation team led jointly by Credit, Treasury, and the Corporate Controller’s group, that also includes other lines of business and functions within the Company. The implementation team is developing models that can meet the requirements of the new guidance. While this standard may potentially have a material impact on the Company’s financial statements, we are still in process of conducting our evaluation. ASU 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment The standard eliminates the requirement to calculate the implied fair value of goodwill (i.e. Step 2 of the current goodwill impairment test) to measure a goodwill impairment charge. Instead, entities would record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value (i.e., measure the charge based on Step 1 of the current guidance). The standard does not change the guidance on completing Step 1 of the goodwill impairment test. The standard also continues to allow entities to perform the optional qualitative goodwill impairment assessment before determining whether to proceed to Step 1. The standard is effective for the Company as of January 1, 2020. Early adoption is allowed for any goodwill impairment test performed after January 1, 2017. January 1, 2020 We do not currently expect this guidance will have a material impact on the Company’s financial statements since the fair values of our reporting units were not lower than their respective carrying amounts at the time of our goodwill impairment analysis for 2017. Standard Description Date of adoption Effect on the financial statements or other significant matters Standards adopted by the Company ASU 2014-09, Revenue from Contracts with Customers (Topic 606) and subsequent related ASUs The core principle of the new guidance is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those goods or services. The banking industry does not expect significant changes because major sources of revenue are from financial instruments that have been excluded from the scope of the new standard, (including loans, derivatives, debt and equity securities, etc.). However, these new standards affect other fees charged by banks, such as asset management fees, credit card interchange fees, deposit account fees, etc. Adoption may be made on a full retrospective basis with practical expedients, or on a modified retrospective basis with a cumulative effect adjustment. Additionally, the new guidance significantly increases the disclosures related to revenue recognition practices. January 1, 2018 We adopted this guidance using the modified retrospective transition method. There was no material impact at adoption to the Company’s consolidated financial statements. New disclosures are found in Footnote 10. ASU 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities The standard provides revised accounting guidance related to the accounting for and reporting of financial instruments. Some of the main provisions include: January 1, 2018 The transition adjustment upon adoption of this guidance was not material. We refined our valuation models to better account for an exit price, which does not impact our financial statements, but does have an impact on our disclosures, as provided in Footnote 3. ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities The purpose of this standard is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. The standard is effective for public business entities for fiscal years beginning after December 15, 2018, with early adoption, including adoption in an interim period, permitted. The standard requires a modified retrospective transition method that requires recognition of the cumulative effect of the change on the opening balance of each affected component of equity in the statement of financial position as of the date of adoption. January 1, 2018 We early adopted this guidance in the first quarter. The adoption of this guidance did not have a material impact on our consolidated financial statements at transition.

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2018
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 Company’s valuation methodologies for assets and liabilities measured at fair value and the fair value hierarchy, see Note 3 of our 2017 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, 2018 Level 1 Level 2 Level 3 Total ASSETS Investment securities: Available-for-sale: 1 U.S. Treasury, agencies and corporations $ 25 $ 13,266 $ — $ 13,291 Municipal securities 1,312 1,312 Other debt securities 24 24 Total Available-for-sale 25 14,602 — 14,627 Trading account 89 118 207 Other noninterest-bearing investments: Bank-owned life insurance 513 513 Private equity investments 102 102 Other assets: Agriculture loan servicing and interest-only strips 18 18 Deferred compensation plan assets 108 108 Derivatives: Interest rate swaps and forwards 1 1 Interest rate swaps for customers 22 22 Foreign currency exchange contracts 6 6 Total Assets $ 228 $ 15,256 $ 120 $ 15,604 LIABILITIES Securities sold, not yet purchased $ 44 $ — $ — $ 44 Other liabilities: Deferred compensation plan obligations 108 108 Derivatives: Interest rate swaps for customers 65 65 Foreign currency exchange contracts 5 5 Total Liabilities $ 157 $ 65 $ — $ 222 1 We used a third-party pricing service to measure fair value for approximately 95% of our AFS Level 2 securities. (In millions) December 31, 2017 Level 1 Level 2 Level 3 Total ASSETS Investment securities: Available-for-sale: 1 U.S. Treasury, agencies and corporations $ 25 $ 13,706 $ — $ 13,731 Municipal securities 1,334 1,334 Other debt securities 24 24 Money market mutual funds and other 71 1 72 Total Available-for-sale 96 15,065 — 15,161 Trading account 148 148 Other noninterest-bearing investments: Bank-owned life insurance 507 507 Private equity investments 95 95 Other assets: Agriculture loan servicing and interest-only strips 18 18 Deferred compensation plan assets 102 102 Derivatives: Interest rate swaps and forwards 1 1 Interest rate swaps for customers 28 28 Foreign currency exchange contracts 9 9 Total Assets $ 207 $ 15,749 $ 113 $ 16,069 LIABILITIES Securities sold, not yet purchased $ 95 $ — $ — $ 95 Other liabilities: Deferred compensation plan obligations 102 102 Derivatives: Interest rate swaps for customers 33 33 Foreign currency exchange contracts 7 7 Total Liabilities $ 204 $ 33 $ — $ 237 1 We used a third-party pricing service to measure fair value for approximately 92% of our AFS Level 2 securities. Level 3 Valuations Private Equity Investments Private equity investments (“PEIs”) are generally measured under Level 3. Certain investments that have converted to being publicly-traded are measured under Level 1. The majority of these PEIs are held in Zions’ Small Business Investment Company (“SBIC”) and are early-stage venture investments. The fair value measurements of these investments are updated at least on a quarterly basis, including whenever a new round of financing occurs. Certain of these investments are measured using multiples of operating performance. The fair value measurements of PEIs are reviewed on a quarterly basis by the Securities Valuation Committee. The Equity Investments Committee, consisting of executives familiar with the investments, reviews periodic financial information, including audited financial statements when available. Certain valuation analytics may be employed that include current and projected financial performance, recent financing activities, economic and market conditions, market comparables, market liquidity, sales restrictions, and other factors. A significant change in the expected performance of the individual investment would result in a change in the fair value measurement of the investment. The amount of unfunded commitments to invest is disclosed in Note 5 . Certain restrictions apply for the redemption of these investments and certain investments are prohibited by the Volcker Rule. See discussions in Note 5 . Agriculture Loan Servicing This asset results from our servicing of agriculture loans approved and funded by Federal Agricultural Mortgage Corporation (“FAMC”). We provide this servicing under an agreement with FAMC for loans they own. The asset’s fair value represents our projection of the present value of future cash flows measured under Level 3 using discounted cash flow methodologies. Interest-Only Strips Interest-only strips are created as a by-product of the securitization process. When the guaranteed portions of Small Business Administration (“SBA”) 7(a) loans are pooled, interest-only strips may be created in the pooling process. The asset’s fair value represents our projection of the present value of future cash flows measured under Level 3 using discounted cash flow methodologies. 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, 2018 June 30, 2017 June 30, 2018 June 30, 2017 (In millions) Private Ag loan svcg and int-only strips Private Ag loan svcg and int-only strips Private Ag loan svcg and int-only strips Private Ag loan svcg and int-only strips Balance at beginning of period $ 100 $ 18 $ 78 $ 20 $ 95 $ 18 $ 73 $ 20 Securities gains (losses), net 1 — (1 ) — 1 — 2 — Other noninterest income — — — (1 ) — — — (1 ) Purchases 1 — 5 — 6 — 12 — Redemptions and paydowns — — — — — — (5 ) — Balance at end of period $ 102 $ 18 $ 82 $ 19 $ 102 $ 18 $ 82 $ 19 No transfers of assets or liabilities occurred among Levels 1, 2 or 3 for the three and six months ended June 30, 2018 and 2017 . The reconciliation of Level 3 instruments includes the following realized gains and losses in the statement of income: (In millions) Three Months Ended Six Months Ended 2018 2017 2018 2017 Securities gains (losses), net $ — $ — $ (3 ) $ 3 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, 2018 Fair value at December 31, 2017 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total ASSETS Private equity investments $ — $ — $ — $ — $ — $ — $ 1 $ 1 Impaired loans — 24 — 24 — 9 — 9 Other real estate owned — 1 — 1 — — — — Total $ — $ 25 $ — $ 25 $ — $ 9 $ 1 $ 10 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 2018 2017 2018 2017 ASSETS Private equity investments $ — $ — $ — $ (1 ) Impaired loans (1 ) (6 ) (5 ) (7 ) Other real estate owned — — (1 ) — Total $ (1 ) $ (6 ) $ (6 ) $ (8 ) During the three months ended June 30 , we recognized an insignificant amount of net gains in 2018 and 2017 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 2018 and an insignificant amount in 2017 from the sale of OREO properties that had a carrying value at the time of sale of approximately $2 million and $3 million during the six months ended June 30, 2018 and 2017 , respectively. Previous to their sale in these periods, we recognized impairment on these properties of an insignificant amount in 2018 and 2017 . 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 $10 million at both June 30, 2018 and December 31, 2017 . Amounts of other noninterest-bearing investments carried at cost were $341 million at June 30, 2018 and $338 million at December 31, 2017 , 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, 2018 and $36 million at December 31, 2017 . 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 2017 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, 2018 December 31, 2017 (In millions) Carrying value Estimated fair value Level Carrying value Estimated fair value Level Financial assets: HTM investment securities $ 878 $ 866 2 $ 770 $ 762 2 Loans and leases (including loans held for sale), net of allowance 44,824 43,715 3 44,306 44,226 3 Financial liabilities: Time deposits 4,011 3,985 2 3,115 3,099 2 Other short-term borrowings 3,650 3,650 2 3,600 3,600 2 Long-term debt 383 390 2 383 402 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. With the adoption of ASU 2016-01, we have updated our process for estimating the fair value for our loans and leases, net of allowance. Our updated process identifies an exit price using current origination rates, making certain adjustments based on credit and utilizing publicly available rates and indices. 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 2017 Annual Report on Form 10-K.

Offsetting Assets and Liabiliti

Offsetting Assets and Liabilities (Notes)	6 Months Ended
	Jun. 30, 2018
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, 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 $ 607 $ (49 ) $ 558 $ — $ — $ 558 Derivatives (included in other assets) 29 — 29 (4 ) (9 ) 16 Total assets $ 636 $ (49 ) $ 587 $ (4 ) $ (9 ) $ 574 Liabilities: Federal funds and other short-term borrowings $ 4,207 $ (49 ) $ 4,158 $ — $ — $ 4,158 Derivatives (included in other liabilities) 70 — 70 (4 ) (1 ) 65 Total Liabilities $ 4,277 $ (49 ) $ 4,228 $ (4 ) $ (1 ) $ 4,223 December 31, 2017 (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 $ 809 $ (295 ) $ 514 $ — $ — $ 514 Derivatives (included in other assets) 38 — 38 (9 ) (1 ) 28 Total assets $ 847 $ (295 ) $ 552 $ (9 ) $ (1 ) $ 542 Liabilities: Federal funds and other short-term borrowings $ 5,271 $ (295 ) $ 4,976 $ — $ — $ 4,976 Derivatives (included in other liabilities) 40 — 40 (9 ) (6 ) 25 Total Liabilities $ 5,311 $ (295 ) $ 5,016 $ (9 ) $ (6 ) $ 5,001 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 Company’s balance sheet. See Note 7 for further information regarding derivative instruments.

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2018
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 are reported 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 and discounts for both 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 2017 Annual Report on Form 10-K discusses the process to estimate fair value for investment securities. June 30, 2018 (In millions) Amortized cost Gross unrealized gains Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 878 $ 4 $ 16 $ 866 Available-for-sale U.S. Treasury securities 25 — — 25 U.S. Government agencies and corporations: Agency securities 1,683 — 26 1,657 Agency guaranteed mortgage-backed securities 9,831 8 301 9,538 Small Business Administration loan-backed securities 2,115 1 45 2,071 Municipal securities 1,333 2 23 1,312 Other debt securities 25 — 1 24 Total available-for-sale 15,012 11 396 14,627 Total investment securities $ 15,890 $ 15 $ 412 $ 15,493 December 31, 2017 (In millions) Amortized Gross unrealized gains Gross unrealized losses Estimated Held-to-maturity Municipal securities $ 770 $ 5 $ 13 $ 762 Available-for-sale U.S. Treasury securities 25 — — 25 U.S. Government agencies and corporations: Agency securities 1,830 1 13 1,818 Agency guaranteed mortgage-backed securities 9,798 9 141 9,666 Small Business Administration loan-backed securities 2,227 10 15 2,222 Municipal securities 1,336 9 11 1,334 Other debt securities 25 — 1 24 Total available-for-sale debt securities 15,241 29 181 15,089 Money market mutual funds and other 72 — — 72 Total available-for-sale 15,313 29 181 15,161 Total investment securities $ 16,083 $ 34 $ 194 $ 15,923 Maturities The amortized cost and estimated fair value of investment debt securities are shown subsequently as of June 30, 2018 , by expected timing 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, 2018 Held-to-maturity Available-for-sale (In millions) Amortized cost Estimated fair value Amortized cost Estimated fair value Due in one year or less $ 295 $ 294 $ 1,773 $ 1,738 Due after one year through five years 380 376 4,444 4,330 Due after five years through ten years 147 143 4,565 4,445 Due after ten years 56 53 4,230 4,114 Total $ 878 $ 866 $ 15,012 $ 14,627 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, 2018 Less than 12 months 12 months or more Total (In millions) Gross unrealized losses Estimated fair value Gross unrealized losses Estimated fair value Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 4 $ 259 $ 12 $ 306 $ 16 $ 565 Available-for-sale U.S. Government agencies and corporations: Agency securities 16 899 10 655 26 1,554 Agency guaranteed mortgage-backed securities 118 4,531 183 4,175 301 8,706 Small Business Administration loan-backed securities 21 1,427 24 585 45 2,012 Municipal securities 14 860 9 216 23 1,076 Other — — 1 13 1 13 Total available-for-sale 169 7,717 227 5,644 396 13,361 Total $ 173 $ 7,976 $ 239 $ 5,950 $ 412 $ 13,926 December 31, 2017 Less than 12 months 12 months or more Total (In millions) Gross unrealized losses Estimated fair value Gross unrealized losses Estimated fair value Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 3 $ 263 $ 10 $ 292 $ 13 $ 555 Available-for-sale U.S. Government agencies and corporations: Agency securities 6 808 7 808 13 1,616 Agency guaranteed mortgage-backed securities 29 3,609 112 4,721 141 8,330 Small Business Administration loan-backed securities 3 408 12 649 15 1,057 Municipal securities 6 554 5 230 11 784 Other — — 1 14 1 14 Total available-for-sale 44 5,379 137 6,422 181 11,801 Total $ 47 $ 5,642 $ 147 $ 6,714 $ 194 $ 12,356 At June 30, 2018 and December 31, 2017 , respectively, 653 and 667 HTM and 4,317 and 2,262 AFS investment securities were in an unrealized loss position. Other-Than-Temporary Impairment The Company did not recognize any other-than-temporary impairment (“OTTI”) on its investment securities portfolio during the first six months of 2018 . 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, 2018 , 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 2017 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, 2018 2017 2018 2017 (In millions) Gross gains Gross losses Gross gains Gross losses Gross gains Gross losses Gross gains Gross losses Investment securities: Other noninterest-bearing investments $ 4 $ 3 $ 4 $ 2 $ 6 $ 5 $ 14 $ 7 Net gains 1 $ 1 $ 2 $ 1 $ 7 1 Net gains were recognized in securities gains, net in the statement of income. Interest income by security type is as follows: Three Months Ended June 30, (In millions) 2018 2017 Taxable Nontaxable Total Taxable Nontaxable Total Investment securities: Held-to-maturity $ 3 $ 3 $ 6 $ 2 $ 3 $ 5 Available-for-sale 70 7 77 71 7 78 Trading 2 — 2 1 — 1 Total $ 75 $ 10 $ 85 $ 74 $ 10 $ 84 Six Months Ended June 30, (In millions) 2018 2017 Taxable Nontaxable Total Taxable Nontaxable Total Investment securities: Held-to-maturity $ 5 $ 7 $ 12 $ 5 $ 7 $ 12 Available-for-sale 142 13 155 137 12 149 Trading 3 — 3 1 — 1 Total $ 150 $ 20 $ 170 $ 143 $ 19 $ 162 Investment securities with a carrying value of $2.1 billion at both June 30, 2018 and December 31, 2017 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. Private Equity Investments Effect of Volcker Rule The Company’s PEIs are subject to the provisions of the Dodd-Frank Wall Street Reform and Consumer Protection Act (“Dodd-Frank Act”). The Volcker Rule of the Dodd-Frank Act prohibits banks and bank holding companies from holding PEIs, except for SBIC funds and certain other permitted exclusions, beyond a required deadline. The Federal Reserve Board (“FRB”) announced in December 2016 that it would allow banks to apply for an additional five-year extension beyond the July 21, 2017 deadline to comply with the Dodd-Frank Act requirement for these investments. The Company applied for and was granted an extension for its eligible PEIs. All positions in the remaining portfolio of PEIs are subject to the extended deadline or other applicable exclusions. Of the recorded PEIs of $151 million at June 30, 2018 , approximately $3 million remain prohibited by the Volcker Rule. At June 30, 2018 , we have $32 million of unfunded commitments for PEIs, of which approximately $3 million relate to prohibited PEIs. We currently do not believe that this divestiture requirement will ultimately have a material impact on our financial statements. See other discussions related to private equity investments in Note 3 .

Loans And Allowance For Credit

Loans And Allowance For Credit Losses	6 Months Ended
	Jun. 30, 2018
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 $ 84 $ 44 Commercial: Commercial and industrial $ 14,134 $ 14,003 Leasing 358 364 Owner-occupied 7,365 7,288 Municipal 1,388 1,271 Total commercial 23,245 22,926 Commercial real estate: Construction and land development 2,202 2,021 Term 8,771 9,103 Total commercial real estate 10,973 11,124 Consumer: Home equity credit line 2,825 2,777 1-4 family residential 6,861 6,662 Construction and other consumer real estate 661 597 Bankcard and other revolving plans 490 509 Other 175 185 Total consumer 11,012 10,730 Total loans $ 45,230 $ 44,780 Loan balances are presented net of unearned income and fees, which amounted to $62 million at June 30, 2018 and $65 million at December 31, 2017 . Owner-occupied and commercial real estate loans include unamortized premiums of approximately $15 million at June 30, 2018 and $16 million December 31, 2017 . 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 development loans included in the construction and land development loan class were $243 million at June 30, 2018 and $220 million at December 31, 2017 . Loans with a carrying value of approximately $24.4 billion at June 30, 2018 and $25.6 billion at December 31, 2017 have been pledged at the Federal Reserve or the FHLB of Des Moines as collateral for current and potential borrowings. We sold loans totaling $206 million and $312 million for the three and six months ended June 30, 2018 and $234 million and $550 million for the three and six months ended June 30, 2017 , 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 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 was $235 million and $400 million for the three and six months ended June 30, 2018 and $176 million and $479 million for the three and six months ended June 30, 2017 , 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, 2018 and December 31, 2017 . Income from loans sold, excluding servicing, was $4 million and $7 million for the three and six months ended June 30, 2018 , and $4 million and $8 million for the three and six months ended June 30, 2017 , 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 2017 Annual Report on Form 10-K. Changes in the allowance for credit losses are summarized as follows: Three Months Ended June 30, 2018 (In millions) Commercial Commercial real estate 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 real estate 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 Three Months Ended June 30, 2017 (In millions) Commercial Commercial real estate Consumer Total Allowance for loan losses Balance at beginning of period $ 397 $ 114 $ 33 $ 544 Provision for loan losses 9 (5 ) 3 7 Gross loan and lease charge-offs 31 1 3 35 Recoveries 18 8 2 28 Net loan and lease charge-offs (recoveries) 13 (7 ) 1 7 Balance at end of period $ 393 $ 116 $ 35 $ 544 Reserve for unfunded lending commitments Balance at beginning of period $ 51 $ 9 $ — $ 60 Provision for unfunded lending commitments 3 — — 3 Balance at end of period $ 54 $ 9 $ — $ 63 Total allowance for credit losses at end of period Allowance for loan losses $ 393 $ 116 $ 35 $ 544 Reserve for unfunded lending commitments 54 9 — 63 Total allowance for credit losses $ 447 $ 125 $ 35 $ 607 Six Months Ended June 30, 2017 (In millions) Commercial Commercial real estate Consumer Total Allowance for loan losses Balance at beginning of period $ 420 $ 116 $ 31 $ 567 Provision for loan losses 32 (9 ) 7 30 Gross loan and lease charge-offs 82 2 8 92 Recoveries 23 11 5 39 Net loan and lease charge-offs (recoveries) 59 (9 ) 3 53 Balance at end of period $ 393 $ 116 $ 35 $ 544 Reserve for unfunded lending commitments Balance at beginning of period $ 54 $ 11 $ — $ 65 Provision for unfunded lending commitments — (2 ) — (2 ) Balance at end of period $ 54 $ 9 $ — $ 63 Total allowance for credit losses at end of period Allowance for loan losses $ 393 $ 116 $ 35 $ 544 Reserve for unfunded lending commitments 54 9 — 63 Total allowance for credit losses $ 447 $ 125 $ 35 $ 607 The ALLL and outstanding loan balances according to the Company’s impairment method are summarized as follows: June 30, 2018 (In millions) Commercial Commercial real estate Consumer Total Allowance for loan losses: Individually evaluated for impairment $ 9 $ 5 $ 3 $ 17 Collectively evaluated for impairment 312 117 44 473 Purchased loans with evidence of credit deterioration — — — — Total $ 321 $ 122 $ 47 $ 490 Outstanding loan balances: Individually evaluated for impairment $ 217 $ 77 $ 76 $ 370 Collectively evaluated for impairment 23,028 10,896 10,936 44,860 Purchased loans with evidence of credit deterioration — — — — Total $ 23,245 $ 10,973 $ 11,012 $ 45,230 December 31, 2017 (In millions) Commercial Commercial real estate Consumer Total Allowance for loan losses: Individually evaluated for impairment $ 26 $ 1 $ 4 $ 31 Collectively evaluated for impairment 345 102 40 487 Purchased loans with evidence of credit deterioration — — — — Total $ 371 $ 103 $ 44 $ 518 Outstanding loan balances: Individually evaluated for impairment $ 314 $ 69 $ 76 $ 459 Collectively evaluated for impairment 22,598 11,048 10,648 44,294 Purchased loans with evidence of credit deterioration 14 7 6 27 Total $ 22,926 $ 11,124 $ 10,730 $ 44,780 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 2017 Annual Report on Form 10-K. Nonaccrual loans are summarized as follows: (In millions) June 30, December 31, Loans held for sale $ — $ 12 Commercial: Commercial and industrial $ 142 $ 195 Leasing 7 8 Owner-occupied 63 90 Municipal 1 1 Total commercial 213 294 Commercial real estate: Construction and land development 5 4 Term 53 36 Total commercial real estate 58 40 Consumer: Home equity credit line 14 13 1-4 family residential 56 55 Construction and other consumer real estate 1 — Bankcard and other revolving plans — — Other — — Total consumer loans 71 68 Total $ 342 $ 402 Past due loans (accruing and nonaccruing) are summarized as follows: June 30, 2018 (In millions) Current 30-89 days past due 90+ days past due Total past due Total loans Accruing loans 90+ days past due Nonaccrual loans that are current 1 Loans held for sale $ 84 $ — $ — $ — $ 84 $ — $ — Commercial: Commercial and industrial $ 14,030 $ 59 $ 45 $ 104 $ 14,134 $ 3 $ 93 Leasing 356 1 1 2 358 — 7 Owner-occupied 7,324 19 22 41 7,365 — 36 Municipal 1,388 — — — 1,388 — 1 Total commercial 23,098 79 68 147 23,245 3 137 Commercial real estate: Construction and land development 2,196 1 5 6 2,202 — — Term 8,726 36 9 45 8,771 1 43 Total commercial real estate 10,922 37 14 51 10,973 1 43 Consumer: Home equity credit line 2,814 4 7 11 2,825 — 5 1-4 family residential 6,830 11 20 31 6,861 — 32 Construction and other consumer real estate 657 4 — 4 661 — 1 Bankcard and other revolving plans 486 3 1 4 490 1 — Other 174 1 — 1 175 — — Total consumer loans 10,961 23 28 51 11,012 1 38 Total $ 44,981 $ 139 $ 110 $ 249 $ 45,230 $ 5 $ 218 December 31, 2017 (In millions) Current 30-89 days past due 90+ days past due Total past due Total loans Accruing loans 90+ days past due Nonaccrual loans that are current 1 Loans held for sale $ 44 $ — $ — $ — $ 44 $ — $ 12 Commercial: Commercial and industrial $ 13,887 $ 60 $ 56 $ 116 $ 14,003 $ 13 $ 146 Leasing 363 1 — 1 364 — 8 Owner-occupied 7,219 29 40 69 7,288 4 49 Municipal 1,271 — — — 1,271 — 1 Total commercial 22,740 90 96 186 22,926 17 204 Commercial real estate: Construction and land development 2,014 3 4 7 2,021 — — Term 9,079 13 11 24 9,103 2 25 Total commercial real estate 11,093 16 15 31 11,124 2 25 Consumer: Home equity credit line 2,763 9 5 14 2,777 — 5 1-4 family residential 6,621 16 25 41 6,662 1 27 Construction and other consumer real estate 590 6 1 7 597 1 — Bankcard and other revolving plans 506 2 1 3 509 1 — Other 184 1 — 1 185 — — Total consumer loans 10,664 34 32 66 10,730 3 32 Total $ 44,497 $ 140 $ 143 $ 283 $ 44,780 $ 22 $ 261 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 2017 Annual Report on Form 10-K. Outstanding loan balances (accruing and nonaccruing) categorized by these credit quality classifications are summarized as follows: June 30, 2018 (In millions) Pass Special Mention Sub- standard Doubtful Total loans Total allowance Commercial: Commercial and industrial $ 13,361 $ 288 $ 484 $ 1 $ 14,134 Leasing 339 5 14 — 358 Owner-occupied 7,077 59 229 — 7,365 Municipal 1,367 2 19 — 1,388 Total commercial 22,144 354 746 1 23,245 $ 321 Commercial real estate: Construction and land development 2,190 7 5 — 2,202 Term 8,551 110 110 — 8,771 Total commercial real estate 10,741 117 115 — 10,973 122 Consumer: Home equity credit line 2,807 — 18 — 2,825 1-4 family residential 6,799 — 62 — 6,861 Construction and other consumer real estate 659 — 2 — 661 Bankcard and other revolving plans 488 — 2 — 490 Other 174 — 1 — 175 Total consumer loans 10,927 — 85 — 11,012 47 Total $ 43,812 $ 471 $ 946 $ 1 $ 45,230 $ 490 December 31, 2017 (In millions) Pass Special Mention Sub- standard Doubtful Total loans Total allowance Commercial: Commercial and industrial $ 13,001 $ 395 $ 606 $ 1 $ 14,003 Leasing 342 6 16 — 364 Owner-occupied 6,920 93 275 — 7,288 Municipal 1,257 13 1 — 1,271 Total commercial 21,520 507 898 1 22,926 $ 371 Commercial real estate: Construction and land development 2,002 15 4 — 2,021 Term 8,816 138 149 — 9,103 Total commercial real estate 10,818 153 153 — 11,124 103 Consumer: Home equity credit line 2,759 — 18 — 2,777 1-4 family residential 6,602 — 60 — 6,662 Construction and other consumer real estate 596 — 1 — 597 Bankcard and other revolving plans 507 — 2 — 509 Other 185 — — — 185 Total consumer loans 10,649 — 81 — 10,730 44 Total $ 42,987 $ 660 $ 1,132 $ 1 $ 44,780 $ 518 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, 2018 and 2017 was not significant. For additional information regarding our policies and methodologies used to evaluate impaired loans, see Note 6 of our 2017 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, 2018 and 2017 : June 30, 2018 (In millions) Unpaid principal balance Recorded investment Total recorded investment Related allowance with no allowance with allowance Commercial: Commercial and industrial $ 189 $ 84 $ 53 $ 137 $ 8 Owner-occupied 64 39 18 57 1 Municipal 1 1 — 1 — Total commercial 254 124 71 195 9 Commercial real estate: Construction and land development 7 4 1 5 — Term 63 33 24 57 4 Total commercial real estate 70 37 25 62 4 Consumer: Home equity credit line 18 13 2 15 — 1-4 family residential 70 27 32 59 3 Construction and other consumer real estate 2 1 1 2 — Other — — — — — Total consumer loans 90 41 35 76 3 Total $ 414 $ 202 $ 131 $ 333 $ 16 December 31, 2017 (In millions) Unpaid principal balance Recorded investment Total recorded investment Related allowance with no allowance with allowance Commercial: Commercial and industrial $ 293 $ 80 $ 142 $ 222 $ 24 Owner-occupied 120 79 23 102 2 Municipal 1 1 — 1 — Total commercial 414 160 165 325 26 Commercial real estate: Construction and land development 8 4 2 6 — Term 56 36 12 48 — Total commercial real estate 64 40 14 54 — Consumer: Home equity credit line 25 13 9 22 — 1-4 family residential 67 28 29 57 4 Construction and other consumer real estate 2 1 1 2 — Other 1 1 — 1 — Total consumer loans 95 43 39 82 4 Total $ 573 $ 243 $ 218 $ 461 $ 30 Three Months Ended Six Months Ended (In millions) Average recorded investment Interest income recognized Average recorded investment Interest income recognized 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 Three Months Ended Six Months Ended (In millions) Average recorded investment Interest income recognized Average recorded investment Interest income recognized Commercial: Commercial and industrial $ 398 $ 4 $ 356 $ 4 Owner-occupied 109 1 102 4 Municipal 1 — 1 — Total commercial 508 5 459 8 Commercial real estate: Construction and land development 11 — 11 — Term 59 7 60 9 Total commercial real estate 70 7 71 9 Consumer: Home equity credit line 21 — 21 — 1-4 family residential 58 1 56 1 Construction and other consumer real estate 2 — 3 — Other 1 — 1 — Total consumer loans 82 1 81 1 Total $ 660 $ 13 $ 611 $ 18 Modified and Restructured Loans Loans may be modified in the normal course of business for competitive reasons or to strengthen the Company’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 Company 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 2017 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, 2018 Recorded investment resulting from the following modification types: (In millions) Interest rate below market Maturity or term extension Principal forgiveness Payment deferral Other 1 Multiple modification types 2 Total Accruing Commercial: Commercial and industrial $ — $ 4 $ — $ — $ 4 $ 6 $ 14 Owner-occupied 2 — — — 10 9 21 Municipal — — — — — 2 2 Total commercial 2 4 — — 14 17 37 Commercial real estate: Construction and land development — — — — — 1 1 Term 4 2 — 1 — 6 13 Total commercial real estate 4 2 — 1 — 7 14 Consumer: Home equity credit line — 2 7 — — 3 12 1-4 family residential 1 — 7 — 1 30 39 Construction and other consumer real estate — 1 — — — 1 2 Total consumer loans 1 3 14 — 1 34 53 Total accruing 7 9 14 1 15 58 104 Nonaccruing Commercial: Commercial and industrial — 6 1 1 10 29 47 Owner-occupied 1 2 — 1 1 5 10 Municipal — 1 — — — — 1 Total commercial 1 9 1 2 11 34 58 Commercial real estate: Term 3 — — — — 3 6 Total commercial real estate 3 — — — — 3 6 Consumer: Home equity credit line — — 2 — — — 2 1-4 family residential — — 1 — 2 8 11 Total consumer loans — — 3 — 2 8 13 Total nonaccruing 4 9 4 2 13 45 77 Total $ 11 $ 18 $ 18 $ 3 $ 28 $ 103 $ 181 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, 2017 Recorded investment resulting from the following modification types: (In millions) Interest rate below market Maturity or term extension Principal forgiveness Payment deferral Other 1 Multiple modification types 2 Total Accruing Commercial: Commercial and industrial $ — $ 2 $ — $ — $ 12 $ 33 $ 47 Owner-occupied 1 1 — — 7 14 23 Total commercial 1 3 — — 19 47 70 Commercial real estate: Construction and land development — — — — — 2 2 Term 6 — — 1 — 7 14 Total commercial real estate 6 — — 1 — 9 16 Consumer: Home equity credit line — 2 9 — 1 3 15 1-4 family residential 1 — 6 1 2 26 36 Construction and other consumer real estate — 1 — — — 1 2 Total consumer loans 1 3 15 1 3 30 53 Total accruing 8 6 15 2 22 86 139 Nonaccruing Commercial: Commercial and industrial — 3 5 2 28 24 62 Owner-occupied 1 2 — 1 1 5 10 Municipal — 1 — — — — 1 Total commercial 1 6 5 3 29 29 73 Commercial real estate: Term 2 — — — — 3 5 Total commercial real estate 2 — — — — 3 5 Consumer: Home equity credit line — — 1 — — — 1 1-4 family residential — — 2 — 1 5 8 Total consumer loans — — 3 — 1 5 9 Total nonaccruing 3 6 8 3 30 37 87 Total $ 11 $ 12 $ 23 $ 5 $ 52 $ 123 $ 226 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 $27 million at June 30, 2018 and $22 million at December 31, 2017 . The total recorded investment of all TDRs in which interest rates were modified below market was $93 million at June 30, 2018 and $120 million at December 31, 2017 . 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, 2018 and 2017 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 $ — $ 5 $ 5 $ — $ 5 1,291 $ 5 Owner-occupied — — — — 1 5,405 1 Total commercial — 5 5 — 6 6 Commercial real estate: Term — 2 2 — 2 2 Total commercial real estate — 2 2 — 2 2 Consumer: 1-4 family residential — 1 1 — 1 1 Total consumer loans — 1 1 — 1 1 Total $ — $ 8 $ 8 $ — $ 9 $ 9 Three Months Ended Six Months Ended (In millions) Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial: Commercial and industrial $ — $ — $ — $ — $ — 1,291 $ — Owner-occupied — 3 3 — 3 5,405 3 Total commercial — 3 3 — 3 3 Total $ — $ 3 $ 3 $ — $ 3 $ 3 Note: Total loans modified as TDRs during the 12 months previous to June 30, 2018 and 2017 were $73 million and $123 million , respectively. At June 30, 2018 and December 31, 2017 , the amount of foreclosed residential real estate property held by the Company was approximately $2 million and less than $1 million , and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure was approximately $9 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 2017 Annual Report on Form 10-K for further discussion of our evaluation of credit risk concentrations. See also Note 7 of our 2017 Annual Report on Form 10-K for a discussion of counterparty risk associated with the Company’s derivative transactions.

Derivative Instruments And Hedg

Derivative Instruments And Hedging Activities	6 Months Ended
	Jun. 30, 2018
Summary of Derivative Instruments [Abstract]
Derivative Instruments And Hedging Activities	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES Objectives and Accounting 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 2017 Annual Report on Form 10-K. 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 2017 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 under their contracts. At June 30, 2018 , the fair value of our derivative liabilities was $70 million , for which we were required to pledge cash collateral of approximately $47 million in the normal course of business. If our credit rating were downgraded one notch by either Standard & Poor’s or Moody’s at June 30, 2018 , there would likely be no additional collateral required to be pledged. As a result of the 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, 2018 and December 31, 2017 , and the related gain (loss) of derivative instruments for the three and six months ended June 30, 2018 and 2017 is summarized as follows: June 30, 2018 December 31, 2017 Notional amount Fair value Notional amount Fair value (In millions) Other assets Other liabilities Other assets Other liabilities Derivatives designated as hedging instruments: Interest rate swaps $ 1,038 $ — $ — $ 1,138 $ — $ — Total derivatives designated as hedging instruments 1,038 — — 1,138 — — Derivatives not designated as hedging instruments: Interest rate swaps and forwards 243 1 — 223 1 — Interest rate swaps for customers 1 5,302 22 65 4,550 28 33 Foreign exchange 354 6 5 913 9 7 Total derivatives not designated as hedging instruments 5,899 29 70 5,686 38 40 Total derivatives $ 6,937 $ 29 $ 70 $ 6,824 $ 38 $ 40 1 Notional amounts include both the customer swaps and the offsetting derivative contracts. Amount of derivative gain (loss) recognized/reclassified Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 (In millions) OCI Reclassified from AOCI to interest income Noninterest income (expense) Offset to interest expense OCI Reclassified from AOCI to interest income Noninterest Offset to Derivatives designated as hedging instruments: Cash flow hedges 1 : Interest rate swaps $ (2 ) $ (1 ) $ (7 ) $ (2 ) Derivatives not designated as hedging instruments: Interest rate swaps for customers $ 4 $ 9 Foreign exchange 5 10 Total derivatives $ (2 ) $ (1 ) $ 9 $ — $ (7 ) $ (2 ) $ 19 $ — Amount of derivative gain (loss) recognized/reclassified Three Months Ended June 30, 2017 Six Months Ended June 30, 2017 (In millions) OCI Reclassified from AOCI to interest income Noninterest income (expense) Offset to interest expense OCI Reclassified from AOCI to interest income Noninterest Offset to Derivatives designated as hedging instruments: Cash flow hedges 1 : Interest rate swaps $ 2 $ 1 $ — $ 3 Derivatives not designated as hedging instruments: Interest rate swaps for customers $ 3 $ 4 Foreign exchange 4 7 Total derivatives $ 2 $ 1 $ 7 $ — $ — $ 3 $ 11 $ — Note: These schedules are not intended to present at any given time the Company’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, 2018 , we estimate that $(7) million will be reclassified from AOCI into interest income. The fair value of derivative assets was reduced by a net credit valuation adjustment of $1 million and $2 million at June 30 , 2018 and 2017 , respectively. The adjustment for derivative liabilities was a decrease of $2 million and $1 million at June 30 , 2018 and 2017 , respectively. These adjustments are required to reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk.

Debt And Shareholders' Equity

Debt And Shareholders' Equity	6 Months Ended
	Jun. 30, 2018
Capitalization, Long-term Debt and Equity [Abstract]
Debt And Shareholders' Equity	LONG-TERM DEBT AND SHAREHOLDERS’ EQUITY Long-term debt is summarized as follows: (In millions) June 30, December 31, 2017 Subordinated notes $ 247 $ 247 Senior notes 135 135 Capital lease obligations 1 1 Total $ 383 $ 383 The preceding carrying values represent the par value of the debt adjusted for any unamortized premium or discount or unamortized debt issuance costs. Repurchases of Company Common Stock During the second quarter of 2018 , we continued our common stock buyback program and repurchased 2.1 million shares of common stock outstanding with a fair value of $120 million at an average price of $55.82 per share. During the first six months of 2018, we repurchased 4.3 million common shares outstanding with a fair value of $235 million at an average price of $54.64 per share. As of June 30, 2018, we had repurchased $465 million of our common stock at an average price of $50.81 per share, which was the total planned common stock repurchases in our 2017 capital plan (which spans the timeframe of July 2017 to June 2018). During the first six months of 2017 , we repurchased 2.2 million shares of common stock outstanding with a fair value of $90 million , at an average price of $41.70 per share. In July 2018, the Company announced that the Board approved a plan to repurchase $185 million of common stock during the third quarter of 2018 and began the repurchases. Common Stock Warrants During the first six months of 2018, 1.1 million shares of common stock were issued from the cashless exercise of 3.3 million common stock ZIONZ warrants. As of June 30, 2018, 2.5 million common stock ZIONZ warrants with an exercise price of $36.27 per share, were outstanding. These warrants expire on November 14, 2018 and were associated with the preferred stock issued under the Troubled Asset Relief Program, which was redeemed in 2012. Additionally, as of June 30, 2018, 29.3 million common stock ZIONW warrants, with an exercise price of $35.22 , were outstanding. These warrants expire on May 22, 2020. Accumulated Other Comprehensive Income Accumulated other comprehensive income (loss) was $(315) million at June 30, 2018 compared with $(139) million at December 31, 2017 . 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, 2018 Balance at December 31, 2017 $ (114 ) $ (2 ) $ (23 ) $ (139 ) OCI (loss) before reclassifications, net of tax (175 ) — — (175 ) 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 (loss) $ (58 ) $ — $ — $ (58 ) Six Months Ended June 30, 2017 Balance at December 31, 2016 $ (93 ) $ 2 $ (31 ) $ (122 ) OCI before reclassifications, net of tax 73 2 — 75 Amounts reclassified from AOCI, net of tax — (2 ) — (2 ) OCI 73 — — 73 Balance at June 30, 2017 $ (20 ) $ 2 $ (31 ) $ (49 ) Income tax expense included in OCI $ 45 $ — $ — $ 45 Amounts reclassified from AOCI 1 Amounts reclassified from AOCI 1 Statement of income (SI) Balance sheet (BS) (In millions) Three Months Ended Six Months Ended Details about AOCI components 2018 2017 2018 2017 Affected line item Net unrealized gains on derivative instruments $ 1 $ 1 $ 2 $ 3 SI Interest and fees on loans Income tax expense — — 1 1 Amounts Reclassified from AOCI $ 1 $ 1 $ 1 $ 2 1 Positive reclassification amounts indicate increases to earnings in the statement of income and decreases to balance sheet assets.

Commitments, Guarantees, And Co

Commitments, Guarantees, And Contingent Liabilities	6 Months Ended
	Jun. 30, 2018
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 $ 20,312 $ 19,583 Standby letters of credit: Financial 699 721 Performance 183 196 Commercial letters of credit 15 31 Total unfunded lending commitments $ 21,209 $ 20,531 1 Net of participations The Company’s 2017 Annual Report on Form 10-K contains further information about these commitments and guarantees including their terms and collateral requirements. At June 30, 2018 , the Company had recorded approximately $5 million as a liability for the guarantees associated with the standby letters of credit, which consisted of $1 million attributable to the RULC and $4 million of deferred commitment fees. At June 30, 2018 , we had unfunded commitments for PEIs of approximately $32 million . These obligations have no stated maturity. PEIs related to these commitments that are prohibited by the Volcker Rule were $3 million at June 30, 2018 . See related discussions about these investments in Note 5 . 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, 2018 , we were subject to the following material litigation or governmental inquiries: • 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. The case relates to our depositor relationships with customers who were promoters of an investment program that allegedly misappropriated investors’ funds. This case is in an early phase, with initial motion practice having been completed and discovery being underway. • 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. • 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 but discovery not having been commenced. • 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 Company. In January 2018, the plaintiff filed an appeal with the Court of Appeals for the Ninth Circuit. The appellate briefing process is underway and is scheduled to be completed in the third quarter of 2018. • 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 Company who worked in California on a non-exempt basis, violations by the Company 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. • a civil case, 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. In this case, certain manufacturers and distributors of medical products seek to hold us liable for allegedly fraudulent practices of a borrower of the Company which filed for bankruptcy protection in 2017. The case is in early phase, with initial motion practice underway. 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, 2018 , we estimated that the aggregate range of reasonably possible losses for those matters to be from $0 million to roughly $15 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 estimates relating to claims will change from time to time in light of developments and actual outcomes will differ from our estimates. These differences may be material.

Retirement Plans

Retirement Plans	6 Months Ended
	Jun. 30, 2018
Defined Benefit Plan [Abstract]
Retirement Plans	RETIREMENT PLANS The following discloses the net periodic benefit cost (credit) and its components for the Company’s pension and other retirement plans: (In millions) Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Interest cost $ 1 $ 2 $ 3 $ 4 Expected return on plan assets (3 ) (3 ) (6 ) (6 ) Partial settlement loss — 1 1 1 Amortization of net actuarial loss 1 1 1 2 Net periodic benefit cost (benefit) $ (1 ) $ 1 $ (1 ) $ 1 As disclosed in our 2017 Annual Report on Form 10-K, the Company has frozen its participation and benefit accruals for the pension plan and its contributions for individual benefit payments in the postretirement benefit plan.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The effective income tax rate of 22.1% for the second quarter of 2018 was lower than the 2017 second quarter rate of 32.3% . The effective tax rates for the first six months of 2018 and 2017 were 22.5% and 28.7% , respectively. The tax rates for 2018 and 2017 were reduced by nontaxable municipal interest income and nontaxable income from certain bank-owned life insurance. The income tax rate for 2018 was positively impacted by the decrease in the corporate federal income tax rate to 21% from 35% due to the Tax Cuts and Jobs Act, which was effective January 1, 2018. This rate benefit was partially reduced by the non-deductibility of Federal Deposit Insurance Corporation (“FDIC”) premiums and certain fringe benefits as enacted by the new tax law. The tax rate for 2017 was also impacted by a one-time $14 million benefit to tax expense related to state tax adjustments and a one-time $4 million benefit due to changes in the carrying value of various state deferred tax items. We had a net deferred tax asset (“DTA”) balance of $149 million at June 30, 2018 , compared with $93 million at December 31, 2017 . The increase in the net DTA resulted primarily from the increase of accrued compensation and unrealized losses in OCI related to securities, and the decrease in deferred tax liabilities related to premises and equipment and the deferred gain on a prior period debt exchange. Net charge-offs exceeding the provision for loan losses offset some of the overall increase in DTA.

Net Earnings per Common Share (

Net Earnings per Common Share (Notes)	6 Months Ended
	Jun. 30, 2018
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) 2018 2017 2018 2017 Basic: Net income $ 197 $ 168 $ 435 $ 308 Less common and preferred dividends 57 30 104 57 Undistributed earnings 140 138 331 251 Less undistributed earnings applicable to nonvested shares 1 1 3 3 Undistributed earnings applicable to common shares 139 137 328 248 Distributed earnings applicable to common shares 47 16 86 32 Total earnings applicable to common shares $ 186 $ 153 $ 414 $ 280 Weighted average common shares outstanding (in thousands) 195,583 201,822 196,149 202,083 Net earnings per common share $ 0.95 $ 0.76 $ 2.11 $ 1.39 Diluted: Total earnings applicable to common shares $ 186 $ 153 $ 414 $ 280 Weighted average common shares outstanding (in thousands) 195,583 201,822 196,149 202,083 Dilutive effect of common stock warrants (in thousands) 12,640 5,351 12,627 6,159 Dilutive effect of stock options (in thousands) 1,024 1,010 1,083 1,111 Weighted average diluted common shares outstanding (in thousands) 209,247 208,183 209,859 209,353 Net earnings per common share $ 0.89 $ 0.73 $ 1.97 $ 1.34 The following schedule presents the weighted average shares of 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) 2018 2017 2018 2017 Restricted stock and restricted stock units 1,709 2,094 1,733 2,108

Operating Segment Information

Operating Segment Information	6 Months Ended
	Jun. 30, 2018
Operating Segment Information [Abstract]
Operating Segment Information	OPERATING SEGMENT INFORMATION We 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 continues to be refined. Prior period amounts have been reclassified to reflect these changes. Total average loans and deposits presented for the banking segments do not include intercompany amounts between banking segments, but may include deposits with the Other segment. As of June 30, 2018 , our banking business is conducted through 7 locally managed and branded segments in distinct geographical areas. Zions Bank operates 97 branches in Utah, 23 branches in Idaho, and one branch in Wyoming. Amegy operates 73 branches in Texas. CB&T operates 91 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 one branch in Washington and one branch in Oregon. The operating segment identified as “Other” includes the Parent, certain nonbank 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 Parent’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 Company. 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, 2018 and 2017 : (In millions) Zions Bank Amegy CB&T NBAZ NSB 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 170 $ 165 $ 126 $ 122 $ 129 $ 122 $ 57 $ 50 $ 38 $ 33 Provision for loan losses 4 (2 ) (11 ) 7 2 (1 ) 7 (1 ) — — Net interest income after provision for loan losses 166 167 137 115 127 123 50 51 38 33 Noninterest income 38 37 31 30 19 19 10 10 10 10 Noninterest expense 118 109 91 89 77 76 38 36 36 35 Income (loss) before income taxes $ 86 $ 95 $ 77 $ 56 $ 69 $ 66 $ 22 $ 25 $ 12 $ 8 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 12,633 $ 12,483 $ 11,387 $ 10,856 $ 9,908 $ 9,476 $ 4,640 $ 4,246 $ 2,349 $ 2,372 Total average deposits 15,983 15,982 11,060 11,218 11,181 10,917 4,942 4,762 4,314 4,233 (In millions) Vectra TCBW Other Consolidated Company 2018 2017 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 34 $ 31 $ 13 $ 11 $ (19 ) $ (6 ) $ 548 $ 528 Provision for loan losses 2 3 1 — — 1 5 7 Net interest income after provision for loan losses 32 28 12 11 (19 ) (7 ) 543 521 Noninterest income 6 7 1 1 23 18 138 132 Noninterest expense 26 25 5 5 37 30 428 405 Income (loss) before income taxes $ 12 $ 10 $ 8 $ 7 $ (33 ) $ (19 ) $ 253 $ 248 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 2,881 $ 2,603 $ 1,117 $ 911 $ 363 $ 296 $ 45,278 $ 43,243 Total average deposits 2,784 2,728 1,048 1,094 1,584 1,400 52,896 52,334 The following schedule presents selected operating segment information for the six months ended June 30, 2018 and 2017 : (In millions) Zions Bank Amegy CB&T NBAZ NSB 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 337 $ 318 $ 253 $ 235 $ 260 $ 231 $ 111 $ 100 $ 74 $ 64 Provision for loan losses 2 33 (56 ) 8 4 (6 ) 9 1 — (5 ) Net interest income after provision for loan losses 335 285 309 227 256 237 102 99 74 69 Noninterest income 73 72 64 59 40 36 19 20 20 20 Noninterest expense 232 221 170 173 154 151 76 73 73 70 Income (loss) before income taxes $ 176 $ 136 $ 203 $ 113 $ 142 $ 122 $ 45 $ 46 $ 21 $ 19 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 12,543 $ 12,486 $ 11,379 $ 10,747 $ 9,919 $ 9,391 $ 4,591 $ 4,254 $ 2,349 $ 2,355 Total average deposits 15,848 16,117 10,938 11,268 11,150 10,919 4,863 4,712 4,269 4,222 (In millions) Vectra TCBW Other Consolidated Company 2018 2017 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 66 $ 61 $ 25 $ 22 $ (36 ) $ (14 ) $ 1,090 $ 1,017 Provision for loan losses 5 — 2 (1 ) (1 ) — (35 ) 30 Net interest income after provision for loan losses 61 61 23 23 (35 ) (14 ) 1,125 987 Noninterest income 12 12 3 2 45 43 276 264 Noninterest expense 53 50 11 10 71 71 840 819 Income (loss) before income taxes $ 20 $ 23 $ 15 $ 15 $ (61 ) $ (42 ) $ 561 $ 432 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 2,837 $ 2,569 $ 1,101 $ 894 $ 370 $ 210 $ 45,089 $ 42,906 Total average deposits 2,748 2,759 1,060 1,097 1,571 1,180 52,447 52,274

Basis of Presentaion Organizati

Basis of Presentaion Organization and Presentation (Policies)	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	BASIS OF PRESENTATION The accompanying unaudited consolidated financial statements of Zions Bancorporation (“the Parent”) and its majority-owned subsidiaries (collectively “the Company,” “Zions,” “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, 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. In certain cases, ASUs are issued jointly with International Financial Reporting Standards. Operating results for the six months ended June 30, 2018 and 2017 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, 2017 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 Company’s 2017 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. Zions Bancorporation is a financial holding company headquartered in Salt Lake City, Utah, which owns and operates a commercial bank. The Parent and its subsidiaries (collectively “the Company”) provide a full range of banking and related services in 11 Western and Southwestern states through 7 separately managed and branded units as follows: Zions Bank, in Utah, Idaho and Wyoming; Amegy Bank (“Amegy”), in Texas; California Bank & Trust (“CB&T”); National Bank of Arizona (“NBAZ”); Nevada State Bank (“NSB”); Vectra Bank Colorado (“Vectra”), in Colorado and New Mexico; and The Commerce Bank of Washington (“TCBW”) which operates under that name in Washington and under the name The Commerce Bank of Oregon in Oregon. The Parent also owns and operates certain nonbank subsidiaries that engage in financial services.

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis	(In millions) June 30, 2018 Level 1 Level 2 Level 3 Total ASSETS Investment securities: Available-for-sale: 1 U.S. Treasury, agencies and corporations $ 25 $ 13,266 $ — $ 13,291 Municipal securities 1,312 1,312 Other debt securities 24 24 Total Available-for-sale 25 14,602 — 14,627 Trading account 89 118 207 Other noninterest-bearing investments: Bank-owned life insurance 513 513 Private equity investments 102 102 Other assets: Agriculture loan servicing and interest-only strips 18 18 Deferred compensation plan assets 108 108 Derivatives: Interest rate swaps and forwards 1 1 Interest rate swaps for customers 22 22 Foreign currency exchange contracts 6 6 Total Assets $ 228 $ 15,256 $ 120 $ 15,604 LIABILITIES Securities sold, not yet purchased $ 44 $ — $ — $ 44 Other liabilities: Deferred compensation plan obligations 108 108 Derivatives: Interest rate swaps for customers 65 65 Foreign currency exchange contracts 5 5 Total Liabilities $ 157 $ 65 $ — $ 222 1 We used a third-party pricing service to measure fair value for approximately 95% of our AFS Level 2 securities. (In millions) December 31, 2017 Level 1 Level 2 Level 3 Total ASSETS Investment securities: Available-for-sale: 1 U.S. Treasury, agencies and corporations $ 25 $ 13,706 $ — $ 13,731 Municipal securities 1,334 1,334 Other debt securities 24 24 Money market mutual funds and other 71 1 72 Total Available-for-sale 96 15,065 — 15,161 Trading account 148 148 Other noninterest-bearing investments: Bank-owned life insurance 507 507 Private equity investments 95 95 Other assets: Agriculture loan servicing and interest-only strips 18 18 Deferred compensation plan assets 102 102 Derivatives: Interest rate swaps and forwards 1 1 Interest rate swaps for customers 28 28 Foreign currency exchange contracts 9 9 Total Assets $ 207 $ 15,749 $ 113 $ 16,069 LIABILITIES Securities sold, not yet purchased $ 95 $ — $ — $ 95 Other liabilities: Deferred compensation plan obligations 102 102 Derivatives: Interest rate swaps for customers 33 33 Foreign currency exchange contracts 7 7 Total Liabilities $ 204 $ 33 $ — $ 237 1 We used a third-party pricing service to measure fair value for approximately 92% 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, 2018 June 30, 2017 June 30, 2018 June 30, 2017 (In millions) Private Ag loan svcg and int-only strips Private Ag loan svcg and int-only strips Private Ag loan svcg and int-only strips Private Ag loan svcg and int-only strips Balance at beginning of period $ 100 $ 18 $ 78 $ 20 $ 95 $ 18 $ 73 $ 20 Securities gains (losses), net 1 — (1 ) — 1 — 2 — Other noninterest income — — — (1 ) — — — (1 ) Purchases 1 — 5 — 6 — 12 — Redemptions and paydowns — — — — — — (5 ) — Balance at end of period $ 102 $ 18 $ 82 $ 19 $ 102 $ 18 $ 82 $ 19
Schedule Of Realized Gains (Losses) Using Level 3 Inputs	(In millions) Three Months Ended Six Months Ended 2018 2017 2018 2017 Securities gains (losses), net $ — $ — $ (3 ) $ 3
Schedule Of Assets With Fair Value Changes On Nonrecurring Basis	(In millions) Fair value at June 30, 2018 Fair value at December 31, 2017 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total ASSETS Private equity investments $ — $ — $ — $ — $ — $ — $ 1 $ 1 Impaired loans — 24 — 24 — 9 — 9 Other real estate owned — 1 — 1 — — — — Total $ — $ 25 $ — $ 25 $ — $ 9 $ 1 $ 10 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 2018 2017 2018 2017 ASSETS Private equity investments $ — $ — $ — $ (1 ) Impaired loans (1 ) (6 ) (5 ) (7 ) Other real estate owned — — (1 ) — Total $ (1 ) $ (6 ) $ (6 ) $ (8 )
Fair Value, by Balance Sheet Grouping [Table Text Block]	June 30, 2018 December 31, 2017 (In millions) Carrying value Estimated fair value Level Carrying value Estimated fair value Level Financial assets: HTM investment securities $ 878 $ 866 2 $ 770 $ 762 2 Loans and leases (including loans held for sale), net of allowance 44,824 43,715 3 44,306 44,226 3 Financial liabilities: Time deposits 4,011 3,985 2 3,115 3,099 2 Other short-term borrowings 3,650 3,650 2 3,600 3,600 2 Long-term debt 383 390 2 383 402 2 June 30, 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 $ 607 $ (49 ) $ 558 $ — $ — $ 558 Derivatives (included in other assets) 29 — 29 (4 ) (9 ) 16 Total assets $ 636 $ (49 ) $ 587 $ (4 ) $ (9 ) $ 574 Liabilities: Federal funds and other short-term borrowings $ 4,207 $ (49 ) $ 4,158 $ — $ — $ 4,158 Derivatives (included in other liabilities) 70 — 70 (4 ) (1 ) 65 Total Liabilities $ 4,277 $ (49 ) $ 4,228 $ (4 ) $ (1 ) $ 4,223 December 31, 2017 (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 $ 809 $ (295 ) $ 514 $ — $ — $ 514 Derivatives (included in other assets) 38 — 38 (9 ) (1 ) 28 Total assets $ 847 $ (295 ) $ 552 $ (9 ) $ (1 ) $ 542 Liabilities: Federal funds and other short-term borrowings $ 5,271 $ (295 ) $ 4,976 $ — $ — $ 4,976 Derivatives (included in other liabilities) 40 — 40 (9 ) (6 ) 25 Total Liabilities $ 5,311 $ (295 ) $ 5,016 $ (9 ) $ (6 ) $ 5,001

Offsetting Assets and Liabili24

Offsetting Assets and Liabilities (Tables)	6 Months Ended
	Jun. 30, 2018
Offsetting Assets and Liabilities [Abstract]
Fair Value, by Balance Sheet Grouping [Table Text Block]	June 30, 2018 December 31, 2017 (In millions) Carrying value Estimated fair value Level Carrying value Estimated fair value Level Financial assets: HTM investment securities $ 878 $ 866 2 $ 770 $ 762 2 Loans and leases (including loans held for sale), net of allowance 44,824 43,715 3 44,306 44,226 3 Financial liabilities: Time deposits 4,011 3,985 2 3,115 3,099 2 Other short-term borrowings 3,650 3,650 2 3,600 3,600 2 Long-term debt 383 390 2 383 402 2 June 30, 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 $ 607 $ (49 ) $ 558 $ — $ — $ 558 Derivatives (included in other assets) 29 — 29 (4 ) (9 ) 16 Total assets $ 636 $ (49 ) $ 587 $ (4 ) $ (9 ) $ 574 Liabilities: Federal funds and other short-term borrowings $ 4,207 $ (49 ) $ 4,158 $ — $ — $ 4,158 Derivatives (included in other liabilities) 70 — 70 (4 ) (1 ) 65 Total Liabilities $ 4,277 $ (49 ) $ 4,228 $ (4 ) $ (1 ) $ 4,223 December 31, 2017 (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 $ 809 $ (295 ) $ 514 $ — $ — $ 514 Derivatives (included in other assets) 38 — 38 (9 ) (1 ) 28 Total assets $ 847 $ (295 ) $ 552 $ (9 ) $ (1 ) $ 542 Liabilities: Federal funds and other short-term borrowings $ 5,271 $ (295 ) $ 4,976 $ — $ — $ 4,976 Derivatives (included in other liabilities) 40 — 40 (9 ) (6 ) 25 Total Liabilities $ 5,311 $ (295 ) $ 5,016 $ (9 ) $ (6 ) $ 5,001

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2018
Investments [Abstract]
Summary Of Investment Securities	June 30, 2018 (In millions) Amortized cost Gross unrealized gains Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 878 $ 4 $ 16 $ 866 Available-for-sale U.S. Treasury securities 25 — — 25 U.S. Government agencies and corporations: Agency securities 1,683 — 26 1,657 Agency guaranteed mortgage-backed securities 9,831 8 301 9,538 Small Business Administration loan-backed securities 2,115 1 45 2,071 Municipal securities 1,333 2 23 1,312 Other debt securities 25 — 1 24 Total available-for-sale 15,012 11 396 14,627 Total investment securities $ 15,890 $ 15 $ 412 $ 15,493 December 31, 2017 (In millions) Amortized Gross unrealized gains Gross unrealized losses Estimated Held-to-maturity Municipal securities $ 770 $ 5 $ 13 $ 762 Available-for-sale U.S. Treasury securities 25 — — 25 U.S. Government agencies and corporations: Agency securities 1,830 1 13 1,818 Agency guaranteed mortgage-backed securities 9,798 9 141 9,666 Small Business Administration loan-backed securities 2,227 10 15 2,222 Municipal securities 1,336 9 11 1,334 Other debt securities 25 — 1 24 Total available-for-sale debt securities 15,241 29 181 15,089 Money market mutual funds and other 72 — — 72 Total available-for-sale 15,313 29 181 15,161 Total investment securities $ 16,083 $ 34 $ 194 $ 15,923
Contractual Maturities Debt Securities	June 30, 2018 Held-to-maturity Available-for-sale (In millions) Amortized cost Estimated fair value Amortized cost Estimated fair value Due in one year or less $ 295 $ 294 $ 1,773 $ 1,738 Due after one year through five years 380 376 4,444 4,330 Due after five years through ten years 147 143 4,565 4,445 Due after ten years 56 53 4,230 4,114 Total $ 878 $ 866 $ 15,012 $ 14,627
Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value	June 30, 2018 Less than 12 months 12 months or more Total (In millions) Gross unrealized losses Estimated fair value Gross unrealized losses Estimated fair value Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 4 $ 259 $ 12 $ 306 $ 16 $ 565 Available-for-sale U.S. Government agencies and corporations: Agency securities 16 899 10 655 26 1,554 Agency guaranteed mortgage-backed securities 118 4,531 183 4,175 301 8,706 Small Business Administration loan-backed securities 21 1,427 24 585 45 2,012 Municipal securities 14 860 9 216 23 1,076 Other — — 1 13 1 13 Total available-for-sale 169 7,717 227 5,644 396 13,361 Total $ 173 $ 7,976 $ 239 $ 5,950 $ 412 $ 13,926 December 31, 2017 Less than 12 months 12 months or more Total (In millions) Gross unrealized losses Estimated fair value Gross unrealized losses Estimated fair value Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 3 $ 263 $ 10 $ 292 $ 13 $ 555 Available-for-sale U.S. Government agencies and corporations: Agency securities 6 808 7 808 13 1,616 Agency guaranteed mortgage-backed securities 29 3,609 112 4,721 141 8,330 Small Business Administration loan-backed securities 3 408 12 649 15 1,057 Municipal securities 6 554 5 230 11 784 Other — — 1 14 1 14 Total available-for-sale 44 5,379 137 6,422 181 11,801 Total $ 47 $ 5,642 $ 147 $ 6,714 $ 194 $ 12,356
Gains And Losses, Including OTTI, Recognized In Statement Of Income	Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 (In millions) Gross gains Gross losses Gross gains Gross losses Gross gains Gross losses Gross gains Gross losses Investment securities: Other noninterest-bearing investments $ 4 $ 3 $ 4 $ 2 $ 6 $ 5 $ 14 $ 7 Net gains 1 $ 1 $ 2 $ 1 $ 7
Tax and Nontaxable Interest Income by Investment Type [Table Text Block]	Three Months Ended June 30, (In millions) 2018 2017 Taxable Nontaxable Total Taxable Nontaxable Total Investment securities: Held-to-maturity $ 3 $ 3 $ 6 $ 2 $ 3 $ 5 Available-for-sale 70 7 77 71 7 78 Trading 2 — 2 1 — 1 Total $ 75 $ 10 $ 85 $ 74 $ 10 $ 84 Six Months Ended June 30, (In millions) 2018 2017 Taxable Nontaxable Total Taxable Nontaxable Total Investment securities: Held-to-maturity $ 5 $ 7 $ 12 $ 5 $ 7 $ 12 Available-for-sale 142 13 155 137 12 149 Trading 3 — 3 1 — 1 Total $ 150 $ 20 $ 170 $ 143 $ 19 $ 162

Loans And Allowance For Credi26

Loans And Allowance For Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investment of accuring and nonaccruing troubled debt restructuring [Text Block]	Three Months Ended Six Months Ended (In millions) Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial: Commercial and industrial $ — $ 5 $ 5 $ — $ 5 1,291 $ 5 Owner-occupied — — — — 1 5,405 1 Total commercial — 5 5 — 6 6 Commercial real estate: Term — 2 2 — 2 2 Total commercial real estate — 2 2 — 2 2 Consumer: 1-4 family residential — 1 1 — 1 1 Total consumer loans — 1 1 — 1 1 Total $ — $ 8 $ 8 $ — $ 9 $ 9 Three Months Ended Six Months Ended (In millions) Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial: Commercial and industrial $ — $ — $ — $ — $ — 1,291 $ — Owner-occupied — 3 3 — 3 5,405 3 Total commercial — 3 3 — 3 3 Total $ — $ 3 $ 3 $ — $ 3 $ 3 Note: Total loans modified as TDRs during the 12 months previous to June 30, 2018 and 2017 were $73 million and $123 million , respectively.
allowance for loan losses by impairment [Table Text Block]	The ALLL and outstanding loan balances according to the Company’s impairment method are summarized as follows: June 30, 2018 (In millions) Commercial Commercial real estate Consumer Total Allowance for loan losses: Individually evaluated for impairment $ 9 $ 5 $ 3 $ 17 Collectively evaluated for impairment 312 117 44 473 Purchased loans with evidence of credit deterioration — — — — Total $ 321 $ 122 $ 47 $ 490 Outstanding loan balances: Individually evaluated for impairment $ 217 $ 77 $ 76 $ 370 Collectively evaluated for impairment 23,028 10,896 10,936 44,860 Purchased loans with evidence of credit deterioration — — — — Total $ 23,245 $ 10,973 $ 11,012 $ 45,230 December 31, 2017 (In millions) Commercial Commercial real estate Consumer Total Allowance for loan losses: Individually evaluated for impairment $ 26 $ 1 $ 4 $ 31 Collectively evaluated for impairment 345 102 40 487 Purchased loans with evidence of credit deterioration — — — — Total $ 371 $ 103 $ 44 $ 518 Outstanding loan balances: Individually evaluated for impairment $ 314 $ 69 $ 76 $ 459 Collectively evaluated for impairment 22,598 11,048 10,648 44,294 Purchased loans with evidence of credit deterioration 14 7 6 27 Total $ 22,926 $ 11,124 $ 10,730 $ 44,780
Summary Of Major Portfolio Segment And Specific Loan Class	(In millions) June 30, December 31, Loans held for sale $ 84 $ 44 Commercial: Commercial and industrial $ 14,134 $ 14,003 Leasing 358 364 Owner-occupied 7,365 7,288 Municipal 1,388 1,271 Total commercial 23,245 22,926 Commercial real estate: Construction and land development 2,202 2,021 Term 8,771 9,103 Total commercial real estate 10,973 11,124 Consumer: Home equity credit line 2,825 2,777 1-4 family residential 6,861 6,662 Construction and other consumer real estate 661 597 Bankcard and other revolving plans 490 509 Other 175 185 Total consumer 11,012 10,730 Total loans $ 45,230 $ 44,780
Summary Of Changes in The Allowance For Credit Losses	Changes in the allowance for credit losses are summarized as follows: Three Months Ended June 30, 2018 (In millions) Commercial Commercial real estate 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 real estate 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 Three Months Ended June 30, 2017 (In millions) Commercial Commercial real estate Consumer Total Allowance for loan losses Balance at beginning of period $ 397 $ 114 $ 33 $ 544 Provision for loan losses 9 (5 ) 3 7 Gross loan and lease charge-offs 31 1 3 35 Recoveries 18 8 2 28 Net loan and lease charge-offs (recoveries) 13 (7 ) 1 7 Balance at end of period $ 393 $ 116 $ 35 $ 544 Reserve for unfunded lending commitments Balance at beginning of period $ 51 $ 9 $ — $ 60 Provision for unfunded lending commitments 3 — — 3 Balance at end of period $ 54 $ 9 $ — $ 63 Total allowance for credit losses at end of period Allowance for loan losses $ 393 $ 116 $ 35 $ 544 Reserve for unfunded lending commitments 54 9 — 63 Total allowance for credit losses $ 447 $ 125 $ 35 $ 607 Six Months Ended June 30, 2017 (In millions) Commercial Commercial real estate Consumer Total Allowance for loan losses Balance at beginning of period $ 420 $ 116 $ 31 $ 567 Provision for loan losses 32 (9 ) 7 30 Gross loan and lease charge-offs 82 2 8 92 Recoveries 23 11 5 39 Net loan and lease charge-offs (recoveries) 59 (9 ) 3 53 Balance at end of period $ 393 $ 116 $ 35 $ 544 Reserve for unfunded lending commitments Balance at beginning of period $ 54 $ 11 $ — $ 65 Provision for unfunded lending commitments — (2 ) — (2 ) Balance at end of period $ 54 $ 9 $ — $ 63 Total allowance for credit losses at end of period Allowance for loan losses $ 393 $ 116 $ 35 $ 544 Reserve for unfunded lending commitments 54 9 — 63 Total allowance for credit losses $ 447 $ 125 $ 35 $ 607
Summary Of Nonaccrual Loans	Nonaccrual loans are summarized as follows: (In millions) June 30, December 31, Loans held for sale $ — $ 12 Commercial: Commercial and industrial $ 142 $ 195 Leasing 7 8 Owner-occupied 63 90 Municipal 1 1 Total commercial 213 294 Commercial real estate: Construction and land development 5 4 Term 53 36 Total commercial real estate 58 40 Consumer: Home equity credit line 14 13 1-4 family residential 56 55 Construction and other consumer real estate 1 — Bankcard and other revolving plans — — Other — — Total consumer loans 71 68 Total $ 342 $ 402
Summary Of Past Due Loans (Accruing And Nonaccruing)	Past due loans (accruing and nonaccruing) are summarized as follows: June 30, 2018 (In millions) Current 30-89 days past due 90+ days past due Total past due Total loans Accruing loans 90+ days past due Nonaccrual loans that are current 1 Loans held for sale $ 84 $ — $ — $ — $ 84 $ — $ — Commercial: Commercial and industrial $ 14,030 $ 59 $ 45 $ 104 $ 14,134 $ 3 $ 93 Leasing 356 1 1 2 358 — 7 Owner-occupied 7,324 19 22 41 7,365 — 36 Municipal 1,388 — — — 1,388 — 1 Total commercial 23,098 79 68 147 23,245 3 137 Commercial real estate: Construction and land development 2,196 1 5 6 2,202 — — Term 8,726 36 9 45 8,771 1 43 Total commercial real estate 10,922 37 14 51 10,973 1 43 Consumer: Home equity credit line 2,814 4 7 11 2,825 — 5 1-4 family residential 6,830 11 20 31 6,861 — 32 Construction and other consumer real estate 657 4 — 4 661 — 1 Bankcard and other revolving plans 486 3 1 4 490 1 — Other 174 1 — 1 175 — — Total consumer loans 10,961 23 28 51 11,012 1 38 Total $ 44,981 $ 139 $ 110 $ 249 $ 45,230 $ 5 $ 218 December 31, 2017 (In millions) Current 30-89 days past due 90+ days past due Total past due Total loans Accruing loans 90+ days past due Nonaccrual loans that are current 1 Loans held for sale $ 44 $ — $ — $ — $ 44 $ — $ 12 Commercial: Commercial and industrial $ 13,887 $ 60 $ 56 $ 116 $ 14,003 $ 13 $ 146 Leasing 363 1 — 1 364 — 8 Owner-occupied 7,219 29 40 69 7,288 4 49 Municipal 1,271 — — — 1,271 — 1 Total commercial 22,740 90 96 186 22,926 17 204 Commercial real estate: Construction and land development 2,014 3 4 7 2,021 — — Term 9,079 13 11 24 9,103 2 25 Total commercial real estate 11,093 16 15 31 11,124 2 25 Consumer: Home equity credit line 2,763 9 5 14 2,777 — 5 1-4 family residential 6,621 16 25 41 6,662 1 27 Construction and other consumer real estate 590 6 1 7 597 1 — Bankcard and other revolving plans 506 2 1 3 509 1 — Other 184 1 — 1 185 — — Total consumer loans 10,664 34 32 66 10,730 3 32 Total $ 44,497 $ 140 $ 143 $ 283 $ 44,780 $ 22 $ 261 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, 2018 (In millions) Pass Special Mention Sub- standard Doubtful Total loans Total allowance Commercial: Commercial and industrial $ 13,361 $ 288 $ 484 $ 1 $ 14,134 Leasing 339 5 14 — 358 Owner-occupied 7,077 59 229 — 7,365 Municipal 1,367 2 19 — 1,388 Total commercial 22,144 354 746 1 23,245 $ 321 Commercial real estate: Construction and land development 2,190 7 5 — 2,202 Term 8,551 110 110 — 8,771 Total commercial real estate 10,741 117 115 — 10,973 122 Consumer: Home equity credit line 2,807 — 18 — 2,825 1-4 family residential 6,799 — 62 — 6,861 Construction and other consumer real estate 659 — 2 — 661 Bankcard and other revolving plans 488 — 2 — 490 Other 174 — 1 — 175 Total consumer loans 10,927 — 85 — 11,012 47 Total $ 43,812 $ 471 $ 946 $ 1 $ 45,230 $ 490 December 31, 2017 (In millions) Pass Special Mention Sub- standard Doubtful Total loans Total allowance Commercial: Commercial and industrial $ 13,001 $ 395 $ 606 $ 1 $ 14,003 Leasing 342 6 16 — 364 Owner-occupied 6,920 93 275 — 7,288 Municipal 1,257 13 1 — 1,271 Total commercial 21,520 507 898 1 22,926 $ 371 Commercial real estate: Construction and land development 2,002 15 4 — 2,021 Term 8,816 138 149 — 9,103 Total commercial real estate 10,818 153 153 — 11,124 103 Consumer: Home equity credit line 2,759 — 18 — 2,777 1-4 family residential 6,602 — 60 — 6,662 Construction and other consumer real estate 596 — 1 — 597 Bankcard and other revolving plans 507 — 2 — 509 Other 185 — — — 185 Total consumer loans 10,649 — 81 — 10,730 44 Total $ 42,987 $ 660 $ 1,132 $ 1 $ 44,780 $ 518
Summary Of Information On Impaired Loans	June 30, 2018 (In millions) Unpaid principal balance Recorded investment Total recorded investment Related allowance with no allowance with allowance Commercial: Commercial and industrial $ 189 $ 84 $ 53 $ 137 $ 8 Owner-occupied 64 39 18 57 1 Municipal 1 1 — 1 — Total commercial 254 124 71 195 9 Commercial real estate: Construction and land development 7 4 1 5 — Term 63 33 24 57 4 Total commercial real estate 70 37 25 62 4 Consumer: Home equity credit line 18 13 2 15 — 1-4 family residential 70 27 32 59 3 Construction and other consumer real estate 2 1 1 2 — Other — — — — — Total consumer loans 90 41 35 76 3 Total $ 414 $ 202 $ 131 $ 333 $ 16 December 31, 2017 (In millions) Unpaid principal balance Recorded investment Total recorded investment Related allowance with no allowance with allowance Commercial: Commercial and industrial $ 293 $ 80 $ 142 $ 222 $ 24 Owner-occupied 120 79 23 102 2 Municipal 1 1 — 1 — Total commercial 414 160 165 325 26 Commercial real estate: Construction and land development 8 4 2 6 — Term 56 36 12 48 — Total commercial real estate 64 40 14 54 — Consumer: Home equity credit line 25 13 9 22 — 1-4 family residential 67 28 29 57 4 Construction and other consumer real estate 2 1 1 2 — Other 1 1 — 1 — Total consumer loans 95 43 39 82 4 Total $ 573 $ 243 $ 218 $ 461 $ 30 Three Months Ended Six Months Ended (In millions) Average recorded investment Interest income recognized Average recorded investment Interest income recognized 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 Three Months Ended Six Months Ended (In millions) Average recorded investment Interest income recognized Average recorded investment Interest income recognized Commercial: Commercial and industrial $ 398 $ 4 $ 356 $ 4 Owner-occupied 109 1 102 4 Municipal 1 — 1 — Total commercial 508 5 459 8 Commercial real estate: Construction and land development 11 — 11 — Term 59 7 60 9 Total commercial real estate 70 7 71 9 Consumer: Home equity credit line 21 — 21 — 1-4 family residential 58 1 56 1 Construction and other consumer real estate 2 — 3 — Other 1 — 1 — Total consumer loans 82 1 81 1 Total $ 660 $ 13 $ 611 $ 18
Summary Of Selected Information On TDRs That Includes Recorded Investment On An Accruing And Nonaccruing Basis By Loan Class And Modification Type	June 30, 2018 Recorded investment resulting from the following modification types: (In millions) Interest rate below market Maturity or term extension Principal forgiveness Payment deferral Other 1 Multiple modification types 2 Total Accruing Commercial: Commercial and industrial $ — $ 4 $ — $ — $ 4 $ 6 $ 14 Owner-occupied 2 — — — 10 9 21 Municipal — — — — — 2 2 Total commercial 2 4 — — 14 17 37 Commercial real estate: Construction and land development — — — — — 1 1 Term 4 2 — 1 — 6 13 Total commercial real estate 4 2 — 1 — 7 14 Consumer: Home equity credit line — 2 7 — — 3 12 1-4 family residential 1 — 7 — 1 30 39 Construction and other consumer real estate — 1 — — — 1 2 Total consumer loans 1 3 14 — 1 34 53 Total accruing 7 9 14 1 15 58 104 Nonaccruing Commercial: Commercial and industrial — 6 1 1 10 29 47 Owner-occupied 1 2 — 1 1 5 10 Municipal — 1 — — — — 1 Total commercial 1 9 1 2 11 34 58 Commercial real estate: Term 3 — — — — 3 6 Total commercial real estate 3 — — — — 3 6 Consumer: Home equity credit line — — 2 — — — 2 1-4 family residential — — 1 — 2 8 11 Total consumer loans — — 3 — 2 8 13 Total nonaccruing 4 9 4 2 13 45 77 Total $ 11 $ 18 $ 18 $ 3 $ 28 $ 103 $ 181 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, 2017 Recorded investment resulting from the following modification types: (In millions) Interest rate below market Maturity or term extension Principal forgiveness Payment deferral Other 1 Multiple modification types 2 Total Accruing Commercial: Commercial and industrial $ — $ 2 $ — $ — $ 12 $ 33 $ 47 Owner-occupied 1 1 — — 7 14 23 Total commercial 1 3 — — 19 47 70 Commercial real estate: Construction and land development — — — — — 2 2 Term 6 — — 1 — 7 14 Total commercial real estate 6 — — 1 — 9 16 Consumer: Home equity credit line — 2 9 — 1 3 15 1-4 family residential 1 — 6 1 2 26 36 Construction and other consumer real estate — 1 — — — 1 2 Total consumer loans 1 3 15 1 3 30 53 Total accruing 8 6 15 2 22 86 139 Nonaccruing Commercial: Commercial and industrial — 3 5 2 28 24 62 Owner-occupied 1 2 — 1 1 5 10 Municipal — 1 — — — — 1 Total commercial 1 6 5 3 29 29 73 Commercial real estate: Term 2 — — — — 3 5 Total commercial real estate 2 — — — — 3 5 Consumer: Home equity credit line — — 1 — — — 1 1-4 family residential — — 2 — 1 5 8 Total consumer loans — — 3 — 1 5 9 Total nonaccruing 3 6 8 3 30 37 87 Total $ 11 $ 12 $ 23 $ 5 $ 52 $ 123 $ 226 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.

Derivative Instruments And He27

Derivative Instruments And Hedging Activities Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2018
Summary of Derivative Instruments [Abstract]
Schedule of Derivative Instruments	June 30, 2018 December 31, 2017 Notional amount Fair value Notional amount Fair value (In millions) Other assets Other liabilities Other assets Other liabilities Derivatives designated as hedging instruments: Interest rate swaps $ 1,038 $ — $ — $ 1,138 $ — $ — Total derivatives designated as hedging instruments 1,038 — — 1,138 — — Derivatives not designated as hedging instruments: Interest rate swaps and forwards 243 1 — 223 1 — Interest rate swaps for customers 1 5,302 22 65 4,550 28 33 Foreign exchange 354 6 5 913 9 7 Total derivatives not designated as hedging instruments 5,899 29 70 5,686 38 40 Total derivatives $ 6,937 $ 29 $ 70 $ 6,824 $ 38 $ 40 1 Notional amounts include both the customer swaps and the offsetting derivative contracts.
Schedule Of Gain (Loss) Of Derivative Instruments	Amount of derivative gain (loss) recognized/reclassified Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 (In millions) OCI Reclassified from AOCI to interest income Noninterest income (expense) Offset to interest expense OCI Reclassified from AOCI to interest income Noninterest Offset to Derivatives designated as hedging instruments: Cash flow hedges 1 : Interest rate swaps $ (2 ) $ (1 ) $ (7 ) $ (2 ) Derivatives not designated as hedging instruments: Interest rate swaps for customers $ 4 $ 9 Foreign exchange 5 10 Total derivatives $ (2 ) $ (1 ) $ 9 $ — $ (7 ) $ (2 ) $ 19 $ — Amount of derivative gain (loss) recognized/reclassified Three Months Ended June 30, 2017 Six Months Ended June 30, 2017 (In millions) OCI Reclassified from AOCI to interest income Noninterest income (expense) Offset to interest expense OCI Reclassified from AOCI to interest income Noninterest Offset to Derivatives designated as hedging instruments: Cash flow hedges 1 : Interest rate swaps $ 2 $ 1 $ — $ 3 Derivatives not designated as hedging instruments: Interest rate swaps for customers $ 3 $ 4 Foreign exchange 4 7 Total derivatives $ 2 $ 1 $ 7 $ — $ — $ 3 $ 11 $ — Note: These schedules are not intended to present at any given time the Company’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, 2018 , we estimate that $(7) million will be reclassified from AOCI into interest income.

Debt And Shareholders' Equity (

Debt And Shareholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Schedule of Long-term Debt Instruments [Table Text Block]	Long-term debt is summarized as follows: (In millions) June 30, December 31, 2017 Subordinated notes $ 247 $ 247 Senior notes 135 135 Capital lease obligations 1 1 Total $ 383 $ 383
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	Amounts reclassified from AOCI 1 Amounts reclassified from AOCI 1 Statement of income (SI) Balance sheet (BS) (In millions) Three Months Ended Six Months Ended Details about AOCI components 2018 2017 2018 2017 Affected line item Net unrealized gains on derivative instruments $ 1 $ 1 $ 2 $ 3 SI Interest and fees on loans Income tax expense — — 1 1 Amounts Reclassified from AOCI $ 1 $ 1 $ 1 $ 2 1 Positive reclassification amounts indicate increases to earnings in the statement of income and decreases to balance sheet assets.
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, 2018 Balance at December 31, 2017 $ (114 ) $ (2 ) $ (23 ) $ (139 ) OCI (loss) before reclassifications, net of tax (175 ) — — (175 ) 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 (loss) $ (58 ) $ — $ — $ (58 ) Six Months Ended June 30, 2017 Balance at December 31, 2016 $ (93 ) $ 2 $ (31 ) $ (122 ) OCI before reclassifications, net of tax 73 2 — 75 Amounts reclassified from AOCI, net of tax — (2 ) — (2 ) OCI 73 — — 73 Balance at June 30, 2017 $ (20 ) $ 2 $ (31 ) $ (49 ) Income tax expense included in OCI $ 45 $ — $ — $ 45

Commitments, Guarantees, And 29

Commitments, Guarantees, And Contingent Liabilities (Tables)	6 Months Ended
	Jun. 30, 2018
Guarantees, Commitments And Contingencies [Abstract]
Schedule Of Guarantees Issued	(In millions) June 30, December 31, Net unfunded commitments to extend credit 1 $ 20,312 $ 19,583 Standby letters of credit: Financial 699 721 Performance 183 196 Commercial letters of credit 15 31 Total unfunded lending commitments $ 21,209 $ 20,531 1 Net of participations

Revenue Recognition Revenue Rec

Revenue Recognition Revenue Recognition (Tables)	6 Months Ended
	Jun. 30, 2018
Revenue Recognition and Deferred Revenue [Abstract]
Revenue Recognition, Services, Commissions [Policy Text Block]	Three Months Ended Six Months Ended (In millions) 2018 2017 2018 2017 Card Fee Income $ 34 $ 33 $ 67 $ 67 ATM Fees 3 3 5 5 Other service charges 4 4 7 7 Other Commissions and fees 5 4 10 7 Ending balance $ 46 $ 44 $ 89 $ 86
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]	Zions Bank Amegy CB&T (In millions) 2018 2017 2018 2017 2018 2017 Service charges and fees on deposit accounts $ 15 $ 16 $ 11 $ 11 $ 7 $ 7 Other service charges, commissions, and fees 18 18 9 9 6 6 Wealth management and trust income 4 4 3 2 1 1 Capital markets and foreign exchange 1 1 (1 ) (1 ) 1 1 Total noninterest income from contracts with customers (ASC 606) 38 39 22 21 15 15 Other noninterest income (Non-ASC 606 customer related) — (1 ) 9 10 4 5 Total customer-related fees 38 38 31 31 19 20 Other noninterest income (non-customer related) — — — — — — Total non-interest income 38 38 31 31 19 20 Net interest income 170 165 126 122 129 122 Total income less interest expense $ 208 $ 203 $ 157 $ 153 $ 148 $ 142 NBAZ NSB Vectra (In millions) 2018 2017 2018 2017 2018 2017 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) 3 4 2 3 2 3 Total customer-related fees 9 10 10 11 6 7 Other noninterest income (non-customer related) — — — — — — Total non-interest income 9 10 10 11 6 7 Net interest income 57 50 38 33 34 31 Total income less interest expense $ 66 $ 60 $ 48 $ 44 $ 40 $ 38 TCBW Other Consolidated Company (In millions) 2018 2017 2018 2017 2018 2017 Service charges and fees on deposit accounts $ — $ — $ — $ — $ 42 $ 43 Other service charges, commissions, and fees 1 1 4 2 46 44 Wealth management and trust income — — 4 2 13 10 Capital markets and foreign exchange — — 2 1 3 2 Total noninterest income from contracts with customers (ASC 606) 1 1 10 5 104 99 Other noninterest income (Non-ASC 606 customer related) — — 1 (2 ) 21 22 Total customer-related fees 1 1 11 3 125 121 Other noninterest income (non-customer related) — — 13 11 13 11 Total non-interest income 1 1 24 14 138 132 Net interest income 13 11 (19 ) (6 ) 548 528 Total income less interest expense $ 14 $ 12 $ 5 $ 8 $ 686 $ 660 The following schedule sets forth the noninterest income and net revenue by operating segments for the six months ended June 30, 2018 and 2017 : Zions Bank Amegy CB&T (In millions) 2018 2017 2018 2017 2018 2017 Service charges and fees on deposit accounts $ 29 $ 30 $ 22 $ 22 $ 14 $ 14 Other service charges, commissions, and fees 35 34 18 19 12 12 Wealth management and trust income 7 7 5 4 2 1 Capital markets and foreign exchange 3 2 (3 ) (3 ) 2 2 Other non-interest income from contracts with customers — — — — — — Total noninterest income from contracts with customers (ASC 606) 74 73 42 42 30 29 Other noninterest income (Non-ASC 606 customer related) (2 ) (2 ) 21 17 9 7 Total customer-related fees 72 71 63 59 39 36 Other noninterest income (non-customer related) — — — — 1 1 Total non-interest income 72 71 63 59 40 37 Other real estate owned income — — — — — — Net interest income 337 318 253 235 260 231 Total income less interest expense $ 409 $ 389 $ 316 $ 294 $ 300 $ 268 NBAZ NSB Vectra (In millions) 2018 2017 2018 2017 2018 2017 Service charges and fees on deposit accounts $ 6 $ 6 $ 7 $ 7 $ 4 $ 4 Other service charges, commissions, and fees 6 6 6 6 3 3 Wealth management and trust income 1 1 2 1 1 1 Capital markets and foreign exchange — — — — — — Other non-interest income from contracts with customers — — — — — — Total noninterest income from contracts with customers (ASC 606) 13 13 15 14 8 8 Other noninterest income (Non-ASC 606 customer related) 6 6 4 5 3 4 Total customer-related fees 19 19 19 19 11 12 Other noninterest income (non-customer related) — — — — — — Total non-interest income 19 19 19 19 11 12 Other real estate owned income — — — — — — Net interest income 111 100 74 64 66 61 Total income less interest expense $ 130 $ 119 $ 93 $ 83 $ 77 $ 73 TCBW Other Consolidated Company (In millions) 2018 2017 2018 2017 2018 2017 Service charges and fees on deposit accounts $ 1 $ 1 $ 1 $ 1 $ 84 $ 85 Other service charges, commissions, and fees 1 1 8 5 89 86 Wealth management and trust income — — 6 4 24 19 Capital markets and foreign exchange — — 3 3 5 4 Other non-interest income from contracts with customers — — — 1 — 1 Total noninterest income from contracts with customers (ASC 606) 2 2 18 14 202 195 Other noninterest income (Non-ASC 606 customer related) 1 — 3 4 45 41 Total customer-related fees 3 2 21 18 247 236 Other noninterest income (non-customer related) — — 28 27 29 28 Total non-interest income 3 2 49 45 276 264 Other real estate owned income — — (1 ) — (1 ) — Net interest income 25 22 (36 ) (14 ) 1,090 1,017 Total income less interest expense $ 28 $ 24 $ 12 $ 31 $ 1,365 $ 1,281

Retirement Plans (Tables)

Retirement Plans (Tables)	6 Months Ended
	Jun. 30, 2018
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, 2018 2017 2018 2017 Interest cost $ 1 $ 2 $ 3 $ 4 Expected return on plan assets (3 ) (3 ) (6 ) (6 ) Partial settlement loss — 1 1 1 Amortization of net actuarial loss 1 1 1 2 Net periodic benefit cost (benefit) $ (1 ) $ 1 $ (1 ) $ 1

Operating Segment Information (

Operating Segment Information (Tables)	6 Months Ended
	Jun. 30, 2018
Segment Reporting Information [Line Items]
Operating Segment Information	OPERATING SEGMENT INFORMATION We 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 continues to be refined. Prior period amounts have been reclassified to reflect these changes. Total average loans and deposits presented for the banking segments do not include intercompany amounts between banking segments, but may include deposits with the Other segment. As of June 30, 2018 , our banking business is conducted through 7 locally managed and branded segments in distinct geographical areas. Zions Bank operates 97 branches in Utah, 23 branches in Idaho, and one branch in Wyoming. Amegy operates 73 branches in Texas. CB&T operates 91 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 one branch in Washington and one branch in Oregon. The operating segment identified as “Other” includes the Parent, certain nonbank 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 Parent’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 Company. 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, 2018 and 2017 : (In millions) Zions Bank Amegy CB&T NBAZ NSB 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 170 $ 165 $ 126 $ 122 $ 129 $ 122 $ 57 $ 50 $ 38 $ 33 Provision for loan losses 4 (2 ) (11 ) 7 2 (1 ) 7 (1 ) — — Net interest income after provision for loan losses 166 167 137 115 127 123 50 51 38 33 Noninterest income 38 37 31 30 19 19 10 10 10 10 Noninterest expense 118 109 91 89 77 76 38 36 36 35 Income (loss) before income taxes $ 86 $ 95 $ 77 $ 56 $ 69 $ 66 $ 22 $ 25 $ 12 $ 8 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 12,633 $ 12,483 $ 11,387 $ 10,856 $ 9,908 $ 9,476 $ 4,640 $ 4,246 $ 2,349 $ 2,372 Total average deposits 15,983 15,982 11,060 11,218 11,181 10,917 4,942 4,762 4,314 4,233 (In millions) Vectra TCBW Other Consolidated Company 2018 2017 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 34 $ 31 $ 13 $ 11 $ (19 ) $ (6 ) $ 548 $ 528 Provision for loan losses 2 3 1 — — 1 5 7 Net interest income after provision for loan losses 32 28 12 11 (19 ) (7 ) 543 521 Noninterest income 6 7 1 1 23 18 138 132 Noninterest expense 26 25 5 5 37 30 428 405 Income (loss) before income taxes $ 12 $ 10 $ 8 $ 7 $ (33 ) $ (19 ) $ 253 $ 248 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 2,881 $ 2,603 $ 1,117 $ 911 $ 363 $ 296 $ 45,278 $ 43,243 Total average deposits 2,784 2,728 1,048 1,094 1,584 1,400 52,896 52,334 The following schedule presents selected operating segment information for the six months ended June 30, 2018 and 2017 : (In millions) Zions Bank Amegy CB&T NBAZ NSB 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 337 $ 318 $ 253 $ 235 $ 260 $ 231 $ 111 $ 100 $ 74 $ 64 Provision for loan losses 2 33 (56 ) 8 4 (6 ) 9 1 — (5 ) Net interest income after provision for loan losses 335 285 309 227 256 237 102 99 74 69 Noninterest income 73 72 64 59 40 36 19 20 20 20 Noninterest expense 232 221 170 173 154 151 76 73 73 70 Income (loss) before income taxes $ 176 $ 136 $ 203 $ 113 $ 142 $ 122 $ 45 $ 46 $ 21 $ 19 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 12,543 $ 12,486 $ 11,379 $ 10,747 $ 9,919 $ 9,391 $ 4,591 $ 4,254 $ 2,349 $ 2,355 Total average deposits 15,848 16,117 10,938 11,268 11,150 10,919 4,863 4,712 4,269 4,222 (In millions) Vectra TCBW Other Consolidated Company 2018 2017 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 66 $ 61 $ 25 $ 22 $ (36 ) $ (14 ) $ 1,090 $ 1,017 Provision for loan losses 5 — 2 (1 ) (1 ) — (35 ) 30 Net interest income after provision for loan losses 61 61 23 23 (35 ) (14 ) 1,125 987 Noninterest income 12 12 3 2 45 43 276 264 Noninterest expense 53 50 11 10 71 71 840 819 Income (loss) before income taxes $ 20 $ 23 $ 15 $ 15 $ (61 ) $ (42 ) $ 561 $ 432 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 2,837 $ 2,569 $ 1,101 $ 894 $ 370 $ 210 $ 45,089 $ 42,906 Total average deposits 2,748 2,759 1,060 1,097 1,571 1,180 52,447 52,274
Schedule of Segment Reporting Information, by Segment	(In millions) Zions Bank Amegy CB&T NBAZ NSB 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 170 $ 165 $ 126 $ 122 $ 129 $ 122 $ 57 $ 50 $ 38 $ 33 Provision for loan losses 4 (2 ) (11 ) 7 2 (1 ) 7 (1 ) — — Net interest income after provision for loan losses 166 167 137 115 127 123 50 51 38 33 Noninterest income 38 37 31 30 19 19 10 10 10 10 Noninterest expense 118 109 91 89 77 76 38 36 36 35 Income (loss) before income taxes $ 86 $ 95 $ 77 $ 56 $ 69 $ 66 $ 22 $ 25 $ 12 $ 8 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 12,633 $ 12,483 $ 11,387 $ 10,856 $ 9,908 $ 9,476 $ 4,640 $ 4,246 $ 2,349 $ 2,372 Total average deposits 15,983 15,982 11,060 11,218 11,181 10,917 4,942 4,762 4,314 4,233 (In millions) Vectra TCBW Other Consolidated Company 2018 2017 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 34 $ 31 $ 13 $ 11 $ (19 ) $ (6 ) $ 548 $ 528 Provision for loan losses 2 3 1 — — 1 5 7 Net interest income after provision for loan losses 32 28 12 11 (19 ) (7 ) 543 521 Noninterest income 6 7 1 1 23 18 138 132 Noninterest expense 26 25 5 5 37 30 428 405 Income (loss) before income taxes $ 12 $ 10 $ 8 $ 7 $ (33 ) $ (19 ) $ 253 $ 248 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 2,881 $ 2,603 $ 1,117 $ 911 $ 363 $ 296 $ 45,278 $ 43,243 Total average deposits 2,784 2,728 1,048 1,094 1,584 1,400 52,896 52,334 The following schedule presents selected operating segment information for the six months ended June 30, 2018 and 2017 : (In millions) Zions Bank Amegy CB&T NBAZ NSB 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 337 $ 318 $ 253 $ 235 $ 260 $ 231 $ 111 $ 100 $ 74 $ 64 Provision for loan losses 2 33 (56 ) 8 4 (6 ) 9 1 — (5 ) Net interest income after provision for loan losses 335 285 309 227 256 237 102 99 74 69 Noninterest income 73 72 64 59 40 36 19 20 20 20 Noninterest expense 232 221 170 173 154 151 76 73 73 70 Income (loss) before income taxes $ 176 $ 136 $ 203 $ 113 $ 142 $ 122 $ 45 $ 46 $ 21 $ 19 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 12,543 $ 12,486 $ 11,379 $ 10,747 $ 9,919 $ 9,391 $ 4,591 $ 4,254 $ 2,349 $ 2,355 Total average deposits 15,848 16,117 10,938 11,268 11,150 10,919 4,863 4,712 4,269 4,222 (In millions) Vectra TCBW Other Consolidated Company 2018 2017 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 66 $ 61 $ 25 $ 22 $ (36 ) $ (14 ) $ 1,090 $ 1,017 Provision for loan losses 5 — 2 (1 ) (1 ) — (35 ) 30 Net interest income after provision for loan losses 61 61 23 23 (35 ) (14 ) 1,125 987 Noninterest income 12 12 3 2 45 43 276 264 Noninterest expense 53 50 11 10 71 71 840 819 Income (loss) before income taxes $ 20 $ 23 $ 15 $ 15 $ (61 ) $ (42 ) $ 561 $ 432 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 2,837 $ 2,569 $ 1,101 $ 894 $ 370 $ 210 $ 45,089 $ 42,906 Total average deposits 2,748 2,759 1,060 1,097 1,571 1,180 52,447 52,274

Basis of Presentaion (Details)

Basis of Presentaion (Details)	Jun. 30, 2018States
Basis Of Presentation [Abstract]
Number of States in which Entity Operates	11
Number of community regional banks operating in distinct geographical areas	7

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Other Liabilities, Fair Value Disclosure	$ 108,000,000		$ 108,000,000		$ 102,000,000
Other Assets, Fair Value Disclosure	108,000,000		108,000,000		102,000,000
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities	2,000,000	$ 1,000,000	2,000,000	$ 1,000,000
Other noninterest-bearing investments valued under the cost method	10,000,000		10,000,000		10,000,000
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	341,000,000		341,000,000		338,000,000
Net gains on sale of OREO properties	0	$ 0	1,000,000	0
Principal amount of other real estate owned property sold			2,000,000	$ 3,000,000
Equity Method Investments, Fair Value Disclosure	38,000,000		38,000,000		36,000,000
OREO Properties [Member]
Derivatives, Fair Value [Line Items]
Net gains on sale of OREO properties			1,000,000
Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	14,602,000,000		14,602,000,000		15,065,000,000
Fair Value, Inputs, Level 3 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	0		0		0
Fair Value, Inputs, Level 1 [Member]
Derivatives, Fair Value [Line Items]
Other Assets, Fair Value Disclosure					102,000,000
Fair value of AFS securities	25,000,000		25,000,000		96,000,000
Third Party Pricing Service [Member] | Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	0.95		0.95		0.92
Derivative Interest Rate Related And Other [Member] | Fair Value, Inputs, Level 2 [Member] | Derivative [Member]
Derivatives, Fair Value [Line Items]
Other Assets, Fair Value Disclosure	1,000,000		1,000,000
Interest Rate Swaps For Customers [Member] | Fair Value, Inputs, Level 2 [Member] | Derivative [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities, Fair Value Disclosure	65,000,000		65,000,000
Other Assets, Fair Value Disclosure	22,000,000		22,000,000
Warranty, Rights and Obligations, Fair Value Option [Member] | Fair Value, Inputs, Level 1 [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities, Fair Value Disclosure	108,000,000		108,000,000		$ 102,000,000
Other Assets, Fair Value Disclosure	$ 108,000,000		$ 108,000,000

Fair Value (Schedule Of Assets

Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading Securities	$ 207	$ 148
Other Assets, Fair Value Disclosure	108	102
Other Liabilities, Fair Value Disclosure	108	102
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	120	113
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	15,256	15,749
Financial and Nonfinancial Liabilities, Fair Value Disclosure	65	33
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	228	207
Financial and Nonfinancial Liabilities, Fair Value Disclosure	157	204
Mutual Funds And Stock Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure		72
Bank-owned life insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	513	507
Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	102	95
Interest-Only-Strip [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	18	18
Available-for-sale Securities [Member] | US Government Corporations and Agencies Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	13,291	13,731
Available-for-sale Securities [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	1,312	1,334
Available-for-sale Securities [Member] | Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	24
Asset-Backed Securities [Member] | Other Credit Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure		24
Derivative [Member] | Interest Rate Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	1	1
Derivative [Member] | Interest Rate Swaps [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	22	28
Other Liabilities, Fair Value Disclosure	65	33
Derivative [Member] | Foreign Exchange Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	6	9
Other Liabilities, Fair Value Disclosure	5	7
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	14,602	15,065
Trading Securities	118	148
Financial Instruments Sold, Not yet Purchased, at Fair Value	0	0
Fair Value, Inputs, Level 2 [Member] | Mutual Funds And Stock Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure		1
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	513	507
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
Fair Value, Inputs, Level 2 [Member] | Available-for-sale Securities [Member] | US Government Corporations and Agencies Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	13,266	13,706
Fair Value, Inputs, Level 2 [Member] | Available-for-sale Securities [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	1,312	1,334
Fair Value, Inputs, Level 2 [Member] | Asset-Backed Securities [Member] | Other Credit Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	24	24
Fair Value, Inputs, Level 2 [Member] | Derivative [Member] | Derivative Interest Rate Related And Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	1
Fair Value, Inputs, Level 2 [Member] | Derivative [Member] | Interest Rate Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure		1
Fair Value, Inputs, Level 2 [Member] | Derivative [Member] | Interest Rate Swaps [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure		28
Other Liabilities, Fair Value Disclosure		33
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0	0
Financial Instruments Sold, Not yet Purchased, at Fair Value	0	0
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	102	95
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	18	18
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | US Government Corporations and Agencies Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure
Fair Value, Inputs, Level 3 [Member] | Asset-Backed Securities [Member] | Other Credit Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	25	96
Trading Securities	89
Other Assets, Fair Value Disclosure		102
Financial Instruments Sold, Not yet Purchased, at Fair Value	44	95
Fair Value, Inputs, Level 1 [Member] | Mutual Funds And Stock Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure		71
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
Fair Value, Inputs, Level 1 [Member] | Available-for-sale Securities [Member] | US Government Corporations and Agencies Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	25	25
Fair Value, Inputs, Level 1 [Member] | Derivative [Member] | Foreign Exchange Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	6	9
Other Liabilities, Fair Value Disclosure	$ 5	$ 7

Fair Value (Schedule Of Key Mod

Fair Value (Schedule Of Key Model Inputs And Assumptions Used To Fair Value Certain Asset-Backed Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Trading Securities	$ 207	$ 148
Other Assets, Fair Value Disclosure	108	102
Other Liabilities, Fair Value Disclosure	108	102
Estimate of Fair Value Measurement [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	14,627	15,161
Trading Securities	207	148
Assets, Fair Value Disclosure	15,604	16,069
Financial Instruments Sold, Not yet Purchased, at Fair Value	44	95
Financial and Nonfinancial Liabilities, Fair Value Disclosure	222	237
Interest Rate Contract [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	1	1
Fair Value, Inputs, Level 3 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assets, Fair Value Disclosure	120	113
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assets, Fair Value Disclosure	15,256	15,749
Financial and Nonfinancial Liabilities, Fair Value Disclosure	65	33
Fair Value, Inputs, Level 1 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assets, Fair Value Disclosure	228	207
Financial and Nonfinancial Liabilities, Fair Value Disclosure	157	204
Foreign Exchange Contract [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	6	9
Other Liabilities, Fair Value Disclosure	5	7
Interest Rate Swap [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	22	28
Other Liabilities, Fair Value Disclosure	65	33
Interest-Only-Strip [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	18	18
Private Equity Funds [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	102	95
Bank-owned life insurance [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	513	507
Mutual Funds And Stock Equity Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure		72
Debt Securities [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	24
Other Credit Derivatives [Member] | Asset-Backed Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure		24
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	1,312	1,334
US Government Corporations and Agencies Securities [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	13,291	13,731
Fair Value, Inputs, Level 2 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	14,602	15,065
Trading Securities	118	148
Financial Instruments Sold, Not yet Purchased, at Fair Value	0	0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure		1
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure		28
Other Liabilities, Fair Value Disclosure		33
Fair Value, Inputs, Level 2 [Member] | Private Equity Funds [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure
Fair Value, Inputs, Level 2 [Member] | Bank-owned life insurance [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	513	507
Fair Value, Inputs, Level 2 [Member] | Mutual Funds And Stock Equity Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure		1
Fair Value, Inputs, Level 2 [Member] | Other Credit Derivatives [Member] | Asset-Backed Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	24	24
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	1,312	1,334
Fair Value, Inputs, Level 2 [Member] | US Government Corporations and Agencies Securities [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	13,266	13,706
Fair Value, Inputs, Level 3 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	0	0
Financial Instruments Sold, Not yet Purchased, at Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | Interest-Only-Strip [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	18	18
Fair Value, Inputs, Level 3 [Member] | Private Equity Funds [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	102	95
Fair Value, Inputs, Level 3 [Member] | Other Credit Derivatives [Member] | Asset-Backed Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure
Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure
Fair Value, Inputs, Level 3 [Member] | US Government Corporations and Agencies Securities [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	25	96
Trading Securities	89
Other Assets, Fair Value Disclosure		102
Financial Instruments Sold, Not yet Purchased, at Fair Value	44	95
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member] | Derivative [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Assets, Fair Value Disclosure	6	9
Other Liabilities, Fair Value Disclosure	5	7
Fair Value, Inputs, Level 1 [Member] | Private Equity Funds [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure
Fair Value, Inputs, Level 1 [Member] | Mutual Funds And Stock Equity Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure		71
Fair Value, Inputs, Level 1 [Member] | US Government Corporations and Agencies Securities [Member] | Available-for-sale Securities [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Investments, Fair Value Disclosure	$ 25	$ 25

Fair Value (Schedule Of Asset37

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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	$ 108		$ 108		$ 102
Other Liabilities, Fair Value Disclosure	108		108		102
Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	100	$ 78	95	$ 73
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Equity Securities Gains (Losses), Net	1	(1)	1	2
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	1	5	6	12
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0	0	5
Fair value of assets, Ending balance	102	82	102	82
Servicing Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	18	20	18	20
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	0	(1)	0	(1)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0	0	0
Fair value of assets, Ending balance	$ 18	$ 19	$ 18	$ 19
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure					$ 102

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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	$ 108		$ 108			$ 102
Other Liabilities, Fair Value Disclosure	108		108			102
Level 3 Equity Securities Gains (Losses), Net [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Realized gains (losses) from Level 3 inputs	0	$ 0	(3)	$ 3
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	102	82	102	82	$ 100	95	$ 78	$ 73
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Equity Securities Gains (Losses), Net	1	(1)	1	2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	1	5	6	12
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0	0	(5)
Servicing Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	18	19	18	19	$ 18	$ 18	$ 20	$ 20
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
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	$ 0	$ 0	$ 0	$ 0

Fair Value (Schedule Of Asset39

Fair Value (Schedule Of Assets With Fair Value Changes On Nonrecurring Basis) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Principal amount of other real estate owned property sold			$ 2	$ 3
Fair value of assets measured on nonrecurring basis	$ 25		25		$ 10
Gains (losses) from fair value changes	(1)	$ (6)	(6)	(8)
Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	24		24		9
Gains (losses) from fair value changes	(1)	(6)	(5)	(7)
Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0		1
Gains (losses) from fair value changes	0	0	0	(1)
Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	1		1		0
Gains (losses) from fair value changes	0	$ 0	(1)	$ 0
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0		0
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0		0
Fair Value, Inputs, Level 1 [Member] | Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0		0
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0		0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	25		25		9
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	24		24		9
Fair Value, Inputs, Level 2 [Member] | Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0		0
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	1		1		0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0		1
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0		0
Fair Value, Inputs, Level 3 [Member] | Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	0		0		1
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets measured on nonrecurring basis	$ 0		$ 0		$ 0

Fair Value (Schedule Of Carryin

Fair Value (Schedule Of Carrying Values And Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity Securities	$ 878	$ 770
Held-to-maturity, fair value	866
Time deposits	4,011	3,115
Long-term debt (less fair value hedges)	383	383
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Loans and leases (including loans held for sale), net of allowance	44,824	44,306
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Loans and leases (including loans held for sale), net of allowance	43,715	44,226
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Other Short-term Borrowings	3,650	3,600
Long-term debt (less fair value hedges)	383	383
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	866	762
Time deposits	3,985	3,099
Other Short-term Borrowings	3,650	3,600
Long-term debt (less fair value hedges)	$ 390	$ 402

Offsetting Assets and Liabili41

Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell [Member] | Assets [Member]
Offsetting Assets [Line Items]
Net amount	$ 558	$ 514
Gross amounts recognized	607	809
Gross amounts offset in the balance sheet	(49)	(295)
Net amounts presented in the balance sheet	558	514
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	16	28
Gross amounts recognized	29	38
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	29	38
Gross amounts not offset in the balance sheet	(4)	(9)
Cash Collateral Received/Pledged	(9)	(1)
Assets, Total [Member] | Assets [Member]
Offsetting Assets [Line Items]
Net amount	574	542
Gross amounts recognized	636	847
Gross amounts offset in the balance sheet	(49)	(295)
Net amounts presented in the balance sheet	587	552
Gross amounts not offset in the balance sheet	(4)	(9)
Cash Collateral Received/Pledged	(9)	(1)
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member] | Other Liabilities [Member]
Offsetting Assets [Line Items]
Net amount	4,158	4,976
Gross amounts recognized	4,207	5,271
Gross amounts offset in the balance sheet	(49)	(295)
Net amounts presented in the balance sheet	4,158	4,976
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	65	25
Gross amounts recognized	70	40
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	70	40
Gross amounts not offset in the balance sheet	(4)	(9)
Cash Collateral Received/Pledged	(1)	(6)
Liabilities, Total [Member] | Other Liabilities [Member]
Offsetting Assets [Line Items]
Net amount	4,223	5,001
Gross amounts recognized	4,277	5,311
Gross amounts offset in the balance sheet	(49)	(295)
Net amounts presented in the balance sheet	4,228	5,016
Gross amounts not offset in the balance sheet	(4)	(9)
Cash Collateral Received/Pledged	$ (1)	$ (6)

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) $ in Millions	Jun. 30, 2018USD ($)Securities	Dec. 31, 2017USD ($)Securities
Investment [Line Items]
Other Real Estate, Foreclosed Assets, Residential Real Estate	$ 2	$ 1
Private equity investments prohibited by Volker rule	$ 3
Number of HTM investment securities in an unrealized loss position | Securities	653	667
Number of AFS investment securities in an unrealized loss position | Securities	4,317	2,262
Carrying value of pledged securities	$ 2,100
Private Equity Investments	151
Commitments for Private Equity and Other Noninterest-bearing Investments	32
Commitments for Private Equity or Other Non-Interest Bearing Investments Prohibited by the Volcker Rule	3
US States and Political Subdivisions Debt Securities [Member]
Investment [Line Items]
Held-to-maturity, Amortized cost	$ 878	$ 770

Investment Securities (Summary

Investment Securities (Summary Of Investment Securities) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Investment [Line Items]
Held-to-maturity, fair value	$ 866
Available-for-sale Debt Securities, Amortized Cost Basis	15,012	$ 15,241
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I		29
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I		181
Available-for-sale Securities, Debt Securities	14,627	15,089
Available-for-sale Securities, Gross Unrealized Gain	11	29
Available-for-sale, Amortized cost	15,012	15,313
Available-for-sale, Gross unrealized losses, Recognized in OCI	396	181
Available-for-sale securities, Estimated fair value	14,627	15,161
amortized cost of investment securities	15,890	16,083
Gross Unrealized Gains of Investment Securities Recognized in OCI	15	34
Gross Unrealized Losses of Investment Securities Recognized in OCI	412	194
Estimated Fair Value of Investment Securities	15,493	15,923
Mutual Funds And Stock [Member]
Investment [Line Items]
Available-for-sale Securities, Gross Unrealized Gain		0
Available-for-sale, Amortized cost		72
Available-for-sale, Gross unrealized losses, Recognized in OCI		0
Available-for-sale securities, Estimated fair value		72
US States and Political Subdivisions Debt Securities [Member]
Investment [Line Items]
Held-to-maturity, fair value	866	762
Held-to-maturity, Amortized cost	878	770
Available-for-sale Debt Securities, Amortized Cost Basis	1,333	1,336
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	2	9
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	23	11
Available-for-sale Securities, Debt Securities	1,312	1,334
Held-to-maturity Securities, Unrecognized Holding Gain	4	5
Held-to-maturity Securities, Unrecognized Holding Loss	16	13
Available-for-sale, Other debt securities [Member]
Investment [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	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	1	1
Available-for-sale Securities, Debt Securities	24	24
US Treasury Securities [Member]
Investment [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	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	0
Available-for-sale Securities, Debt Securities	25	25
Agency Securities [Member]
Investment [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	1,683	1,830
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	0	1
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	26	13
Available-for-sale Securities, Debt Securities	1,657	1,818
Agency Guaranteed Mortgage-Backed Securities [Member]
Investment [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	9,831	9,798
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	8	9
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	301	141
Available-for-sale Securities, Debt Securities	9,538	9,666
Small Business Administration Loan-Backed Securities [Member]
Investment [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	2,115	2,227
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	1	10
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	45	15
Available-for-sale Securities, Debt Securities	$ 2,071	$ 2,222

Investment Securities (Contract

Investment Securities (Contractual Maturities Debt Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Investments [Abstract]
Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost	$ 295
Held-to-maturity, Due in one year or less, Estimated fair value	294
Held-to-maturity, Due after one year through five years, Amortized cost	380
Held-to-maturity, Due after one year through five years, Estimated fair value	376
Held-to-maturity, Due after five years through ten years, Amortized cost	147
Held-to-maturity, Due after five years through ten years, Estimated fair value	143
Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Amortized Cost	56
Held-to-maturity, Due after ten years, Estimated fair value	53
Held-to-maturity, Amortized cost	878
Held-to-maturity, fair value	866
Available-for-sale, Due in one year or less, Amortized cost	1,773
Available-for-sale, Due in one year or less, Estimated fair value	1,738
Available-for-sale, Due after one year through five years, Amortized cost	4,444
Available-for-sale, Due after one year through five years, Estimated fair value	4,330
Available-for-sale, Due after five years through ten years, Amortized cost	4,565
Available-for-sale, Due after five years through ten years, Estimated fair value	4,445
Available-for-sale, Due after ten years, Amortized cost	4,230
Available-for-sale, Due after ten years, Estimated fair value	4,114
Available-for-sale, Amortized cost	15,012	$ 15,241
Available-for-sale, Estimated fair value	$ 14,627	$ 15,089

Investment Securities (Summar45

Investment Securities (Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Investment [Line Items]
Investment Securities Gross Unrealized Losses Less Than 12 Months	$ 173	$ 47
Investment Securities Estimated Fair Value Less Than 12 Months	7,976	5,642
Investment Securities Gross Unrealized Losses 12 Months or More	239	147
Investment Securities Estimated Fair Value 12 Months or More	5,950	6,714
Investment Securities Gross Unrealized Losses Total	412	194
Investment Securities Estimated Fair Value Total	13,926	12,356
US States and Political Subdivisions Debt Securities [Member]
Investment [Line Items]
Held-to-maturity, Less than 12 months - Gross unrealized losses	4	3
Held-to-maturity, Less than 12 months - Estimated fair value	259	263
Held-to-maturity, 12 months or more - Gross unrealized losses	12	10
Held-to-maturity, 12 months or more - Estimated fair value	306	292
Held-to-maturity, Total - Gross unrealized losses	16	13
Held-to-maturity, Total - Estimated fair value	565	555
Available-for-sale, Less than 12 months - Gross unrealized losses	14	6
Available-for-sale, Less than 12 months - Estimated fair value	860	554
Available-for-sale, 12 months or more - Gross unrealized losses	9	5
Available-for-sale, 12 months or more - Estimated fair value	216	230
Available-for-sale, Total - Gross unrealized losses	23	11
Available-for-sale, Total - Estimated fair value	1,076	784
Agency Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	16	6
Available-for-sale, Less than 12 months - Estimated fair value	899	808
Available-for-sale, 12 months or more - Gross unrealized losses	10	7
Available-for-sale, 12 months or more - Estimated fair value	655	808
Available-for-sale, Total - Gross unrealized losses	26	13
Available-for-sale, Total - Estimated fair value	1,554	1,616
Agency Guaranteed Mortgage-Backed Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	118	29
Available-for-sale, Less than 12 months - Estimated fair value	4,531	3,609
Available-for-sale, 12 months or more - Gross unrealized losses	183	112
Available-for-sale, 12 months or more - Estimated fair value	4,175	4,721
Available-for-sale, Total - Gross unrealized losses	301	141
Available-for-sale, Total - Estimated fair value	8,706	8,330
Small Business Administration Loan-Backed Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	21	3
Available-for-sale, Less than 12 months - Estimated fair value	1,427	408
Available-for-sale, 12 months or more - Gross unrealized losses	24	12
Available-for-sale, 12 months or more - Estimated fair value	585	649
Available-for-sale, Total - Gross unrealized losses	45	15
Available-for-sale, Total - Estimated fair value	2,012	1,057
Available-for-sale, Unrealized losses, Other [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	0	0
Available-for-sale, Less than 12 months - Estimated fair value	0	0
Available-for-sale, 12 months or more - Gross unrealized losses	1	1
Available-for-sale, 12 months or more - Estimated fair value	13	14
Available-for-sale, Total - Gross unrealized losses	1	1
Available-for-sale, Total - Estimated fair value	13	14
Available-for-sale Securities [Member]
Investment [Line Items]
Available-for-sale, Less than 12 months - Gross unrealized losses	169	44
Available-for-sale, Less than 12 months - Estimated fair value	7,717	5,379
Available-for-sale, 12 months or more - Gross unrealized losses	227	137
Available-for-sale, 12 months or more - Estimated fair value	5,644	6,422
Available-for-sale, Total - Gross unrealized losses	396	181
Available-for-sale, Total - Estimated fair value	$ 13,361	$ 11,801

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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investments [Abstract]
Other noninterest-bearing investments, Nonmarketable equity securities, Gross gains	$ 4	$ 4	$ 6	$ 14
Other noninterest-bearing investments, Nonmarketable equity securities, Gross losses	3	2	5	7
Gain (Loss) on Investments	$ 1	$ 2	$ 1	$ 7

Investment Securities Taxable a

Investment Securities Taxable and Nontaxable Interest Income by Investment Type (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Noninterest Income	$ 85	$ 84	$ 170	$ 162
Taxable [Member]
Noninterest Income	75	74	150	143
Nontaxable [Member]
Noninterest Income	10	10	20	19
Held-to-maturity Securities [Member]
Noninterest Income	6	5	12	12
Held-to-maturity Securities [Member] | Taxable [Member]
Noninterest Income	3	2	5	5
Held-to-maturity Securities [Member] | Nontaxable [Member]
Noninterest Income	3	3	7	7
Available-for-sale Securities [Member]
Noninterest Income	77	78	155	149
Available-for-sale Securities [Member] | Taxable [Member]
Noninterest Income	70	71	142	137
Available-for-sale Securities [Member] | Nontaxable [Member]
Noninterest Income	7	7	13	12
Trading Securities [Member]
Noninterest Income	2	1	3	1
Trading Securities [Member] | Taxable [Member]
Noninterest Income	2	1	3	1
Trading Securities [Member] | Nontaxable [Member]
Noninterest Income	$ 0	$ 0	$ 0	$ 0

Investment Securities Noncredit

Investment Securities Noncredit impairment recognized in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Noncredit related impairment losses [Line Items]
Investment Income, Interest	$ 85	$ 84	$ 170	$ 162
Trading Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	2	1	3	1
Available-for-sale Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	77	78	155	149
Held-to-maturity Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	6	5	12	12
Taxable [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	75	74	150	143
Taxable [Member] | Trading Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	2	1	3	1
Taxable [Member] | Available-for-sale Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	70	71	142	137
Taxable [Member] | Held-to-maturity Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	3	2	5	5
Nontaxable [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	10	10	20	19
Nontaxable [Member] | Trading Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	0	0	0	0
Nontaxable [Member] | Available-for-sale Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	7	7	13	12
Nontaxable [Member] | Held-to-maturity Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	$ 3	$ 3	$ 7	$ 7

Loans And Allowance For Credi49

Loans And Allowance For Credit Losses (Narrative) (Details) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)d	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		$ 330	$ 660	$ 310	$ 611
Impaired Financing Receivable, Interest Income, Accrual Method		0	13	8	18
Impaired Financing Receivable, Recorded Investment		333		333		$ 333			$ 461
Loans Receivable, Gross, Commercial and Industrial		14,134		14,134		14,134			14,003
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		17		17		17			31
Loans Modified As Troubled Debt Restructurings Loans						73
Unfunded Lending Commitments on Troubled Debt Restructuring		27		27		27			22
Loans and Leases Receivable, Gross		45,230		45,230		45,230			44,780
Financing Receivable, Recorded Investment, Current		44,981		44,981		44,981			44,497
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		8	3	9	3		$ 123
Unearned income and fees, net of related costs		62		62		62
Owner occupied and commercial real estate loans, unamortized premiums		15		15		15
Land Development Loans		243		243		243			220
Loans at carrying value pledged as collateral for current and potential borrowings		24,400		24,400		24,400			25,600
Payments for Origination and Purchases of Loans Held-for-sale		235	176	400	479
Principal Balance of Loans Sold, Serviced Loans		2,200		2,200		2,200			2,200
Loans and Leases Receivable, Gain (Loss) on Sales, Net		4	4	7	8
Principle amount of loans held for sale sold		206	234	$ 312	550
Minimum number of days past due for nonaccrual status | d				90
Recorded investment in TDR loans modified with interest rates below market		93		$ 93		93			120
Provision for Loan and Lease Losses		5	7	(35)	30
Provision for Unfunded Lending Commitments (decrease)		7	3	0	(2)
Other Real Estate, Foreclosed Assets, and Repossessed Assets		2		2		2			1
Other Real Estate, In Process of Forecloseing Assets		9		9		9			10
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		139		139		139			140
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		110		110		110			143
Financing Receivable, Recorded Investment, Past Due		249		249		249			283
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		5		5		5			22
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	218		218		218			261
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		473		473		473			487
Financing Receivable, Allowance for Credit Losses		0		0		0			0
Loans and Leases Receivable, Allowance		490	544	490	544	490	544	$ 473	518	$ 544	$ 567
Financing Receivable, Individually Evaluated for Impairment		370		370		370			459
Financing Receivable, Collectively Evaluated for Impairment		44,860		44,860		44,860			44,294
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment		0		0		0			27
Leases Receivable, Gross, Commercial, Lease Financing		358		358		358			364
Commercial Lending Loans - Owner Occupied		7,365		7,365		7,365			7,288
Loans and Leases Receivable, Gross, Commercial, Governments		1,388		1,388		1,388			1,271
Land Development Loans, Loans Receivable Commercial Construction and Land Development		2,202		2,202		2,202			2,021
Commercial Real Estate Term Loans		8,771		8,771		8,771			9,103
Loans Receivable, Gross, Commercial, Real Estate		10,973		10,973		10,973			11,124
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,825		2,825		2,825			2,777
Loans and Leases Receivable, Gross, Consumer, Mortgage		6,861		6,861		6,861			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		661		661		661			597
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		490		490		490			509
Loans and Leases Receivable, Gross, Consumer, Other		175		175		175			185
Impaired Financing Receivable, Related Allowance		16		16		16			30
Impaired Financing Receivable, Unpaid Principal Balance		414		414		414			573
Municipal [Member]
Loans And 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
Impaired Financing Receivable, Recorded Investment		1		1		1			1
Financing Receivable, Recorded Investment, Nonaccrual Status		1		1		1			1
Impaired Financing Receivable, Related Allowance		0		0		0			0
Impaired Financing Receivable, Unpaid Principal Balance		1		1		1			1
Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		2	2	1	3
Impaired Financing Receivable, Interest Income, Accrual Method		0	0	0	0
Impaired Financing Receivable, Recorded Investment		2		2		2			2
Financing Receivable, Recorded Investment, Nonaccrual Status		1		1		1			0
Impaired Financing Receivable, Related Allowance		0		0		0			0
Impaired Financing Receivable, Unpaid Principal Balance		2		2		2			2
One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		57	58	55	56
Impaired Financing Receivable, Interest Income, Accrual Method		0	1	0	1
Impaired Financing Receivable, Recorded Investment		59		59		59			57
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1		1
Financing Receivable, Recorded Investment, Nonaccrual Status		56		56		56			55
Impaired Financing Receivable, Related Allowance		3		3		3			4
Impaired Financing Receivable, Unpaid Principal Balance		70		70		70			67
Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		137		137		137
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		5	0	5	0
Financing Receivable, Recorded Investment, Nonaccrual Status		142		142		142			195
Impaired Financing Receivable, Related Allowance		8		8		8			24
Impaired Financing Receivable, Unpaid Principal Balance		189		189		189			293
Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		15	21	14	21
Impaired Financing Receivable, Interest Income, Accrual Method		0	0	0	0
Impaired Financing Receivable, Recorded Investment		15		15		15			22
Financing Receivable, Recorded Investment, Nonaccrual Status		14		14		14			13
Impaired Financing Receivable, Related Allowance		0		0		0			0
Impaired Financing Receivable, Unpaid Principal Balance		18		18		18			25
Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		74	82	70	81
Impaired Financing Receivable, Interest Income, Accrual Method		0	1	0	1
Impaired Financing Receivable, Recorded Investment		76		76		76			82
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1		1
Financing Receivable, Recorded Investment, Nonaccrual Status		71		71		71			68
Impaired Financing Receivable, Related Allowance		3		3		3			4
Impaired Financing Receivable, Unpaid Principal Balance		90		90		90			95
Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		14,134		14,134		14,134			14,003
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		9		9		9			26
Loans and Leases Receivable, Gross		23,245		$ 23,245		23,245			22,926
Subsequent payment default period, number of days | d				90
Provision for Loan and Lease Losses		(18)	9	$ (58)	32
Provision for Unfunded Lending Commitments (decrease)		3	3	(5)	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		312		312		312			345
Financing Receivable, Allowance for Credit Losses		0		0		0			0
Loans and Leases Receivable, Allowance		321	393	321	393	321	393	329	371	397	420
Financing Receivable, Individually Evaluated for Impairment									314
Financing Receivable, Collectively Evaluated for Impairment									22,598
Leases Receivable, Gross, Commercial, Lease Financing		358		358		358			364
Commercial Lending Loans - Owner Occupied		7,365		7,365		7,365			7,288
Loans and Leases Receivable, Gross, Commercial, Governments		1,388		1,388		1,388			1,271
Loans and Leases Receivable, before Fees, Gross		23,245		23,245		23,245			22,926
Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		0	1	0	1
Impaired Financing Receivable, Interest Income, Accrual Method		0	0	0	0
Impaired Financing Receivable, Recorded Investment		0		0		0			1
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		3		3		3			4
Loans and Leases Receivable, Gross		11,012		$ 11,012		11,012			10,730
Subsequent payment default period, number of days | d				60
Provision for Loan and Lease Losses		8	3	$ 9	7
Provision for Unfunded Lending Commitments (decrease)		0	0	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status		0		0		0			0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		44		44		44			40
Financing Receivable, Allowance for Credit Losses		0		0		0			0
Loans and Leases Receivable, Allowance		47	35	47	35	47	35	40	44	33	31
Financing Receivable, Individually Evaluated for Impairment									76
Financing Receivable, Collectively Evaluated for Impairment									10,648
Loans and Leases Receivable, before Fees, Gross		11,012		11,012		11,012			10,730
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,825		2,825		2,825			2,777
Loans and Leases Receivable, Gross, Consumer, Mortgage		6,861		6,861		6,861			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		661		661		661			597
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		490		490		490			509
Loans and Leases Receivable, Gross, Consumer, Other		175		175		175			185
Impaired Financing Receivable, Related Allowance		0		0		0			0
Impaired Financing Receivable, Unpaid Principal Balance		0		0		0			1
Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		63	70	58	71
Impaired Financing Receivable, Interest Income, Accrual Method		0	7	0	9
Impaired Financing Receivable, Recorded Investment		62		62		62			54
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment									1
Loans and Leases Receivable, Gross		10,973		10,973		10,973			11,124
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Financing Receivable, Recorded Investment, Nonaccrual Status		58		58		58			40
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment									102
Loans and Leases Receivable, Allowance		122		122		122			103
Financing Receivable, Individually Evaluated for Impairment									69
Financing Receivable, Collectively Evaluated for Impairment									11,048
Impaired Financing Receivable, Related Allowance		4		4		4			0
Impaired Financing Receivable, Unpaid Principal Balance		70		70		70			64
Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		5	11	5	11
Impaired Financing Receivable, Interest Income, Accrual Method		0	0	0	0
Impaired Financing Receivable, Recorded Investment									6
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		5		5		5
Provision for Loan and Lease Losses		15	(5)	14	(9)
Provision for Unfunded Lending Commitments (decrease)		4	0	5	(2)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		117		117		117
Financing Receivable, Allowance for Credit Losses		0		0		0			0
Loans and Leases Receivable, Allowance		122	116	122	116	122	$ 116	$ 104	103	$ 114	$ 116
Land Development Loans, Loans Receivable Commercial Construction and Land Development									2,021
Commercial Real Estate Term Loans		8,771		8,771		8,771			9,103
Loans Receivable, Gross, Commercial, Real Estate		10,973		10,973		10,973			11,124
Construction and Land Development [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		5		5		5			4
Land Development Loans, Loans Receivable Commercial Construction and Land Development		2,202		2,202		2,202
Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		5		5		5
Impaired Financing Receivable, Related Allowance		0		0		0			0
Impaired Financing Receivable, Unpaid Principal Balance		7		7		7			8
Bankcard And Other Revolving Plans [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		0		0		0			0
Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		54	109	55	102
Impaired Financing Receivable, Interest Income, Accrual Method		0	1	8	4
Impaired Financing Receivable, Recorded Investment		57		57		57			102
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	3	1	3
Financing Receivable, Recorded Investment, Nonaccrual Status		63		63		63			90
Impaired Financing Receivable, Related Allowance		1		1		1			2
Impaired Financing Receivable, Unpaid Principal Balance		64		64		64			120
Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		58	59	53	60
Impaired Financing Receivable, Interest Income, Accrual Method		0	7	0	9
Impaired Financing Receivable, Recorded Investment		57		57		57			48
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Financing Receivable, Recorded Investment, Nonaccrual Status		53		53		53			36
Impaired Financing Receivable, Related Allowance		4		4		4			0
Impaired Financing Receivable, Unpaid Principal Balance		63		63		63			56
Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		11,012		11,012		11,012			10,730
Financing Receivable, Recorded Investment, Current		10,961		10,961		10,961			10,664
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		23		23		23			34
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		28		28		28			32
Financing Receivable, Recorded Investment, Past Due		51		51		51			66
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1		1		1			3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	38		38		38			32
Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		175		175		175			185
Financing Receivable, Recorded Investment, Current									184
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			1
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		174		174		174
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		1		1		1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0		0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0		0			0
Finance Leases Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		358		358		358			364
Financing Receivable, Recorded Investment, Current									363
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		2		2		2			1
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		7,365		7,365		7,365			7,288
Financing Receivable, Recorded Investment, Current									7,219
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									29
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									40
Financing Receivable, Recorded Investment, Past Due		41		41		41			69
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									4
Owner Occupied [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		7,324		7,324		7,324
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		19		19		19
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		22		22		22
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	36		36		36			49
Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		1,388		1,388		1,388			1,271
Financing Receivable, Recorded Investment, Current									1,271
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		0		0		0			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		1,388		1,388		1,388
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		0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1		1		1			1
Commercial Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		23,245		23,245		23,245			22,926
Financing Receivable, Recorded Investment, Current		23,098		23,098		23,098			22,740
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		79		79		79			90
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		68		68		68			96
Financing Receivable, Recorded Investment, Past Due		147		147		147			186
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		3		3		3			17
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	137		137		137			204
Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		2,202		2,202		2,202			2,021
Financing Receivable, Recorded Investment, Current									2,014
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									4
Financing Receivable, Recorded Investment, Past Due		6		6		6			7
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		2,196		2,196		2,196
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		1		1		1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		5		5		5
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0		0			0
Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		8,771		8,771		8,771			9,103
Financing Receivable, Recorded Investment, Current									9,079
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									13
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									11
Financing Receivable, Recorded Investment, Past Due		45		45		45			24
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									2
Term [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		8,726		8,726		8,726
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		36		36		36
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		9		9		9
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1		1		1
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	43		43		43			25
Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		10,973		10,973		10,973			11,124
Financing Receivable, Recorded Investment, Current		10,922		10,922		10,922			11,093
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		37		37		37			16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		14		14		14			15
Financing Receivable, Recorded Investment, Past Due		51		51		51			31
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1		1		1			2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	43		43		43			25
Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		2,825		2,825		2,825			2,777
Financing Receivable, Recorded Investment, Current									2,763
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									9
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									5
Financing Receivable, Recorded Investment, Past Due		11		11		11			14
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		2,814		2,814		2,814
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		4		4		4
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		7		7		7
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	5		5		5			5
One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		6,861		6,861		6,861			6,662
Financing Receivable, Recorded Investment, Current									6,621
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									25
Financing Receivable, Recorded Investment, Past Due		31		31		31			41
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									1
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		6,830		6,830		6,830
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		11		11		11
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		20		20		20
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	32		32		32			27
Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		661		661		661			597
Financing Receivable, Recorded Investment, Current									590
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due									6
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due									1
Financing Receivable, Recorded Investment, Past Due		4		4		4			7
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									1
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		657		657		657
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		4		4		4
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0		0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1		1		1			0
Revolving Credit Facility [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		490		490		490			509
Financing Receivable, Recorded Investment, Current									506
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									1
Financing Receivable, Recorded Investment, Past Due		4		4		4			3
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing									1
Revolving Credit Facility [Member] | Bankcard And Other Revolving Plans [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		486		486		486
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		3		3		3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		1		1		1
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1		1		1
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0		0			0
Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		104		104		104			139
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		2		2		2			2
Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0
Loans and Leases Receivable, Gross, Consumer, Mortgage		39		39		39			36
Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		14		14		14			47
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		53		53		53			53
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0
Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		14		14		14			16
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0
Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1		1			2
Accruing [Member] | Construction and Land Development [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment				0
Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		21		21		21			23
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		13		13		13			14
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0
Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		181		181		181			226
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		8	3	9	3
Nonaccruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1		1			1
Nonaccruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1		1
Loans and Leases Receivable, Gross, Consumer, Mortgage		11		11		11			8
Nonaccruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		47		47		47			62
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		5	0	5	0
Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		77		77		77			87
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1		1
Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		13		13		13			9
Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		6		6		6			5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2
Nonaccruing [Member] | Construction and Land Development [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment				2
Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		10		10		10			10
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	$ 3	1	$ 3
Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		6		6		6			5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Outstanding Loan Balances [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment		217		217		217
Financing Receivable, Collectively Evaluated for Impairment		23,028		23,028		23,028
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment		0		0		0			14
Outstanding Loan Balances [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment		76		76		76
Financing Receivable, Collectively Evaluated for Impairment		10,936		10,936		10,936
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment		0		0		0			6
Outstanding Loan Balances [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment		77		77		77
Financing Receivable, Collectively Evaluated for Impairment		10,896		10,896		10,896
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment		0		0		0			7
Pass [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		43,812		43,812		43,812			42,987
Pass [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		13,361		13,361		13,361			13,001
Leases Receivable, Gross, Commercial, Lease Financing		339		339		339			342
Commercial Lending Loans - Owner Occupied		7,077		7,077		7,077			6,920
Loans and Leases Receivable, Gross, Commercial, Governments		1,367		1,367		1,367			1,257
Loans and Leases Receivable, before Fees, Gross		22,144		22,144		22,144			21,520
Pass [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		10,927		10,927		10,927			10,649
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,807		2,807		2,807			2,759
Loans and Leases Receivable, Gross, Consumer, Mortgage		6,799		6,799		6,799			6,602
Loans and Leases Receivable, Gross, Consumer, Construction		659		659		659			596
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		488		488		488			507
Loans and Leases Receivable, Gross, Consumer, Other		174		174		174			185
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									2,002
Commercial Real Estate Term Loans		8,551		8,551		8,551			8,816
Loans Receivable, Gross, Commercial, Real Estate		10,741		10,741		10,741			10,818
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		2,190		2,190		2,190
Special Mention [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		471		471		471			660
Special Mention [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		288		288		288			395
Leases Receivable, Gross, Commercial, Lease Financing		5		5		5			6
Commercial Lending Loans - Owner Occupied		59		59		59			93
Loans and Leases Receivable, Gross, Commercial, Governments		2		2		2			13
Loans and Leases Receivable, before Fees, Gross		354		354		354			507
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			0
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Mortgage		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Construction		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Other		0		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									15
Commercial Real Estate Term Loans		110		110		110			138
Loans Receivable, Gross, Commercial, Real Estate		117		117		117			153
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		7		7		7
Substandard [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		946		946		946			1,132
Substandard [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		484		484		484			606
Leases Receivable, Gross, Commercial, Lease Financing		14		14		14			16
Commercial Lending Loans - Owner Occupied		229		229		229			275
Loans and Leases Receivable, Gross, Commercial, Governments		19		19		19			1
Loans and Leases Receivable, before Fees, Gross		746		746		746			898
Substandard [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		85		85		85			81
Loans and Leases Receivable, Gross, Consumer, Home Equity		18		18		18			18
Loans and Leases Receivable, Gross, Consumer, Mortgage		62		62		62			60
Loans and Leases Receivable, Gross, Consumer, Construction		2		2		2			1
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		2		2		2			2
Loans and Leases Receivable, Gross, Consumer, Other		1		1		1			0
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									4
Commercial Real Estate Term Loans		110		110		110			149
Loans Receivable, Gross, Commercial, Real Estate		115		115		115			153
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		5		5		5
Doubtful [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		1		1		1			1
Doubtful [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		1		1		1			1
Leases Receivable, Gross, Commercial, Lease Financing		0		0		0			0
Commercial Lending Loans - Owner Occupied		0		0		0			0
Loans and Leases Receivable, Gross, Commercial, Governments		0		0		0			0
Loans and Leases Receivable, before Fees, Gross		1		1		1			1
Doubtful [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Mortgage		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Construction		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		0		0		0			0
Loans and Leases Receivable, Gross, Consumer, Other		0		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			0
Loans Receivable, Gross, Commercial, Real Estate		0		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		0
Allowance for Loan and Lease Losses [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		490		490		490			518
Allowance for Loan and Lease Losses [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		47		47		47
Allowance for Loan and Lease Losses [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		321		321		321			371
Allowance for Loan and Lease Losses [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross									44
Allowance for Loan and Lease Losses [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial, Real Estate		122		122		122			103
Impaired Financing Receivable Recorded Investment With No Allowance [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		202		202		202			243
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		1		1			1
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		1		1			1
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		27		27		27			28
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		84		84		84			80
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		13		13		13			13
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		41		41		41			43
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			1
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		37		37		37			40
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		4		4		4			4
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		39		39		39			79
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		33		33		33			36
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		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		1		1		1
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		32		32		32
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		2		2
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		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		1		1		1
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		18		18		18
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		24		24		24
Impaired Financing Receivable Related Allowance [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		131		131		131			218
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									1
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									29
Impaired Financing Receivable Related Allowance [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		53		53		53			142
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									9
Impaired Financing Receivable Related Allowance [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		35		35		35			39
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		25		25		25			14
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									2
Impaired Financing Receivable Related Allowance [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									23
Impaired Financing Receivable Related Allowance [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment									12
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	15		15		15			22
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		1		1			3
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			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	[2]								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]								7
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	[2]								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]	28		28		28			52
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]	13		13		13			30
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]	2		2		2			1
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]	0		0		0			0
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]								1
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]								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]
Loans and Leases Receivable, Gross, Consumer, Construction	[2]	0		0		0			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]
Loans and Leases Receivable, Gross, Consumer, Mortgage	[2]	1		1		1			2
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial	[2]	4		4		4			12
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]
Loans and Leases Receivable, Gross, Consumer, Home Equity	[2]	0		0		0			1
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		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]	10		10		10
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		0
Multiple Modification Types [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	58		58		58			86
Multiple Modification Types [Member] | Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	34		34		34			30
Multiple Modification Types [Member] | Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	7		7		7			9
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	[3]								2
Multiple Modification Types [Member] | Accruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]								14
Multiple Modification Types [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]								7
Multiple Modification Types [Member] | Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	103		103		103			123
Multiple Modification Types [Member] | Nonaccruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Multiple Modification Types [Member] | Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	45		45		45			37
Multiple Modification Types [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	8		8		8			5
Multiple Modification Types [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	3		3		3			3
Multiple Modification Types [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]								5
Multiple Modification Types [Member] | Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]								3
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction	[3]	1		1		1			1
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	[3]	30		30		30			26
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial	[3]	6		6		6			33
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	[3]	3		3		3			3
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]	1		1		1
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]	9		9		9
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	[3]	6		6		6
Interest Rate Below Market [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		7		7		7			8
Interest Rate Below Market [Member] | Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1		1			1
Interest Rate Below Market [Member] | Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		4		4		4			6
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									1
Interest Rate Below Market [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									6
Interest Rate Below Market [Member] | Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		11		11		11			11
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		4		4		4			3
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			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		3		3			2
Interest Rate Below Market [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									1
Interest Rate Below Market [Member] | Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									2
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		0		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]
Loans and Leases Receivable, Gross, Consumer, Mortgage		1		1		1			1
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		0		0		0			0
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		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		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		2		2		2
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		4		4		4
Maturity Or Team Extension [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		9		9		9			6
Maturity Or Team Extension [Member] | Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		3		3		3			3
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		2		2			0
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									1
Maturity Or Team Extension [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Maturity Or Team Extension [Member] | Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		18		18		18			12
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									1
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		9		9		9			6
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			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			0
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									2
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] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		1		1		1			1
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		0		0		0			0
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		4		4		4			2
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		2		2		2			2
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		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		0		0		0
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		2		2
Principal Forgiveness [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		14		14		14			15
Principal Forgiveness [Member] | Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		14		14		14			15
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			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		18		18		18			23
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		4		4		4			8
Principal Forgiveness [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		3		3		3			3
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			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] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		0		0		0			0
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		7		7		7			6
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		0		0		0			0
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		7		7		7			9
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		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		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		0
Payment Deferral [Member] | Accruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1		1			2
Payment Deferral [Member] | Accruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0		0			1
Payment Deferral [Member] | Accruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1		1			1
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
Payment Deferral [Member] | Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		3		3		3			5
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		2		2		2			3
Payment Deferral [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0		0			0
Payment Deferral [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0		0			0
Payment Deferral [Member] | Nonaccruing [Member] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									1
Payment Deferral [Member] | Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment									0
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		0		0		0			0
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		0		0		0			1
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		0		0		0			0
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		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		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		0
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		$ 1		$ 1		$ 1
[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 Credi50

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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at end of period	$ 490	$ 544	$ 490	$ 544
Loans held for sale	84		84			$ 44
Commercial and industrial	14,134		14,134			14,003
Leasing	358		358			364
Owner occupied	7,365		7,365			7,288
Municipal	1,388		1,388			1,271
Land Development Loans, Loans Receivable Commercial Construction and Land Development	2,202		2,202			2,021
Term	8,771		8,771			9,103
Provision for loan losses	(5)	(7)	35	(30)
Allowance for Loan and Lease Losses, Write-offs	13	35	39	92
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	25	28	46	39
Net loan and lease charge-offs	(12)	7	(7)	53
Reserve for unfunded lending commitments	58	63	58	63	$ 51	58	$ 60	$ 65
Provision for Unfunded Lending Commitments (decrease)	7	3	0	(2)
Allowance for loan and lease losses and reserve for unfunded lending commitments	548	$ 607	548	$ 607
Loans Receivable, Gross, Commercial, Real Estate	10,973		10,973			11,124
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,825		2,825			2,777
Loans and Leases Receivable, Gross, Consumer, Mortgage	6,861		6,861			6,662
Loans and Leases Receivable, Gross, Consumer, Construction	661		661			597
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	490		490			509
Loans and Leases Receivable, Gross, Consumer, Other	175		175			185
Loans and Leases Receivable, Gross	45,230		45,230			44,780
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross	23,245		23,245			22,926
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross	$ 11,012		$ 11,012			$ 10,730

Loans And Allowance For Credi51

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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	$ (5)	$ (7)	$ 35	$ (30)
Allowance for Loan and Lease Losses, Write-offs	13	35	39	92
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	473	544	518	567
Allowance for Loan and Lease Losses, Adjustments, Other	(12)	7	(7)	53
Balance at end of period	58	63	58	63
Allowance for loan losses	473	544	518	567	$ 490	$ 473	$ 518	$ 544	$ 544	$ 567
Reserve for unfunded lending commitments	58	63	58	63	58	51	58	63	60	65
Allowance for loan and lease losses and reserve for unfunded lending commitments					548			607
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	25	28	46	39
Provision for Unfunded Lending Commitments (decrease)	7	3	0	(2)
Balance at end of period	490	544	490	544
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	18	(9)	58	(32)
Allowance for Loan and Lease Losses, Write-offs	10	31	30	82
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	329	397	371	420
Allowance for Loan and Lease Losses, Adjustments, Other	(10)	13	(8)	59
Balance at end of period	43	54	43	54
Allowance for loan losses	329	397	371	420	321	329	371	393	397	420
Reserve for unfunded lending commitments	43	54	43	54	43	40	48	54	51	54
Allowance for loan and lease losses and reserve for unfunded lending commitments					364			447
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	20	18	38	23
Provision for Unfunded Lending Commitments (decrease)	3	3	(5)	0
Balance at end of period	321	393	321	393
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	(15)	5	(14)	9
Allowance for Loan and Lease Losses, Write-offs	0	1	0	2
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	104	114	103	116
Allowance for Loan and Lease Losses, Adjustments, Other	(3)	(7)	(5)	(9)
Balance at end of period	15	9	15	9
Allowance for loan losses	104	114	103	116	122	104	103	116	114	116
Reserve for unfunded lending commitments	15	9	15	9	15	11	10	9	9	11
Allowance for loan and lease losses and reserve for unfunded lending commitments					137			125
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	3	8	5	11
Provision for Unfunded Lending Commitments (decrease)	4	0	5	(2)
Balance at end of period	122	116	122	116
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	(8)	(3)	(9)	(7)
Allowance for Loan and Lease Losses, Write-offs	3	3	9	8
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	40	33	44	31
Allowance for Loan and Lease Losses, Adjustments, Other	1	1	6	3
Balance at end of period	0	0	0	0
Allowance for loan losses	40	33	44	31	47	40	44	35	33	31
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					$ 47			$ 35
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	2	2	3	5
Provision for Unfunded Lending Commitments (decrease)	0	0	0	0
Balance at end of period	$ 47	$ 35	$ 47	$ 35

Loans And Allowance For Credi52

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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 330	$ 660	$ 310	$ 611
Impaired Financing Receivable, Interest Income, Accrual Method	0	13	8	18
Allowance for loan losses: Individually evaluated for impairment	(17)		(17)			$ (31)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	473		473			487
Financing Receivable, Individually Evaluated for Impairment	370		370			459
Financing Receivable, Collectively Evaluated for Impairment	44,860		44,860			44,294
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment	0		0			27
Loans and Leases Receivable, Gross	45,230		45,230			44,780
Financing Receivable, Allowance for Credit Losses	0		0			0
Loans and Leases Receivable, Allowance	490	544	490	544	$ 473	518	$ 544	$ 567
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	54	109	55	102
Impaired Financing Receivable, Interest Income, Accrual Method	0	1	8	4
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Individually evaluated for impairment	(9)		(9)			(26)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	312		312			345
Financing Receivable, Individually Evaluated for Impairment						314
Financing Receivable, Collectively Evaluated for Impairment						22,598
Loans and Leases Receivable, Gross	23,245		23,245			22,926
Financing Receivable, Allowance for Credit Losses	0		0			0
Loans and Leases Receivable, Allowance	321	393	321	393	329	371	397	420
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	5	11	5	11
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Allowance for loan losses: Individually evaluated for impairment	(5)		(5)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	117		117
Financing Receivable, Allowance for Credit Losses	0		0			0
Loans and Leases Receivable, Allowance	122	116	122	116	104	103	114	116
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	0	1	0	1
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Allowance for loan losses: Individually evaluated for impairment	(3)		(3)			(4)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	44		44			40
Financing Receivable, Individually Evaluated for Impairment						76
Financing Receivable, Collectively Evaluated for Impairment						10,648
Loans and Leases Receivable, Gross	11,012		11,012			10,730
Financing Receivable, Allowance for Credit Losses	0		0			0
Loans and Leases Receivable, Allowance	47	35	47	35	$ 40	44	$ 33	$ 31
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	193	508	182	459
Impaired Financing Receivable, Interest Income, Accrual Method	0	5	8	8
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	58	59	53	60
Impaired Financing Receivable, Interest Income, Accrual Method	0	7	0	9
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	63	70	58	71
Impaired Financing Receivable, Interest Income, Accrual Method	0	7	0	9
Allowance for loan losses: Individually evaluated for impairment						(1)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment						102
Financing Receivable, Individually Evaluated for Impairment						69
Financing Receivable, Collectively Evaluated for Impairment						11,048
Loans and Leases Receivable, Gross	10,973		10,973			11,124
Loans and Leases Receivable, Allowance	122		122			103
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	15	21	14	21
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	57	58	55	56
Impaired Financing Receivable, Interest Income, Accrual Method	0	1	0	1
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	2	2	1	3
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	74	82	70	81
Impaired Financing Receivable, Interest Income, Accrual Method	0	1	0	1
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	217		217
Financing Receivable, Collectively Evaluated for Impairment	23,028		23,028
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment	0		0			14
Outstanding Loan Balances [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	77		77
Financing Receivable, Collectively Evaluated for Impairment	10,896		10,896
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment	0		0			7
Outstanding Loan Balances [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	76		76
Financing Receivable, Collectively Evaluated for Impairment	10,936		10,936
Certain Loans and Debt Securities Acquired in Transfer, with Related Allowance for Credit Losses Due to Subsequent Impairment	$ 0		$ 0			$ 6

Loans And Allowance For Credi53

Loans And Allowance For Credit Losses (Summary Of Nonaccrual Loans) (Details) - USD ($) $ in Millions		Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	[1]	$ 218	$ 261
loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		0	12
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		7	8
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		63	90
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		213	294
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		53	36
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		58	40
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		14	13
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		56	55
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		1	0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		71	68
Financing Receivables, Total [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		$ 342	$ 402
[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 Credi54

Loans And Allowance For Credit Losses (Summary Of Past Due Loans (Accruing And Nonaccruing)) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 8	$ 3	$ 9	$ 3	$ 123
Financing Receivable, Recorded Investment, Current		44,981		44,981			$ 44,497
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		139		139			140
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		110		110			143
Financing Receivable, Recorded Investment, Past Due		249		249			283
Loans and Leases Receivable, Gross		45,230		45,230			44,780
Accruing loans 90+ days past due		5		5			22
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	218		218			261
Bankcard And Other Revolving Plans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		0		0			0
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		5	0	5	0
Financing Receivable, Recorded Investment, Nonaccrual Status		142		142			195
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		23,245		23,245			22,926
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		5	3	6	3
Financing Receivable, Recorded Investment, Nonaccrual Status		213		213			294
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		11,012		11,012			10,730
Financing Receivable, Recorded Investment, Nonaccrual Status		0		0			0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1		1
Financing Receivable, Recorded Investment, Nonaccrual Status		71		71			68
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		7		7			8
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	3	1	3
Financing Receivable, Recorded Investment, Nonaccrual Status		63		63			90
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		2		2
Financing Receivable, Recorded Investment, Nonaccrual Status		53		53			36
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Loans and Leases Receivable, Gross		10,973		10,973			11,124
Financing Receivable, Recorded Investment, Nonaccrual Status		58		58			40
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		14		14			13
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1		1
Financing Receivable, Recorded Investment, Nonaccrual Status		56		56			55
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		1		1			0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		10,961		10,961			10,664
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		23		23			34
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		28		28			32
Financing Receivable, Recorded Investment, Past Due		51		51			66
Loans and Leases Receivable, Gross		11,012		11,012			10,730
Accruing loans 90+ days past due		1		1			3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	38		38			32
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							184
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		175		175			185
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		174		174
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							506
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							1
Financing Receivable, Recorded Investment, Past Due		4		4			3
Loans and Leases Receivable, Gross		490		490			509
Accruing loans 90+ days past due							1
Revolving Credit Facility [Member] | Bankcard And Other Revolving Plans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		486		486
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		1		1
Accruing loans 90+ days past due		1		1
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							590
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							6
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							1
Financing Receivable, Recorded Investment, Past Due		4		4			7
Loans and Leases Receivable, Gross		661		661			597
Accruing loans 90+ days past due							1
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		657		657
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		4		4
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			0
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							6,621
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							25
Financing Receivable, Recorded Investment, Past Due		31		31			41
Loans and Leases Receivable, Gross		6,861		6,861			6,662
Accruing loans 90+ days past due							1
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		6,830		6,830
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		11		11
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		20		20
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	32		32			27
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							2,763
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							9
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							5
Financing Receivable, Recorded Investment, Past Due		11		11			14
Loans and Leases Receivable, Gross		2,825		2,825			2,777
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		2,814		2,814
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		4		4
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		7		7
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	5		5			5
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		10,922		10,922			11,093
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		37		37			16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		14		14			15
Financing Receivable, Recorded Investment, Past Due		51		51			31
Loans and Leases Receivable, Gross		10,973		10,973			11,124
Accruing loans 90+ days past due		1		1			2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	43		43			25
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							9,079
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							13
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							11
Financing Receivable, Recorded Investment, Past Due		45		45			24
Loans and Leases Receivable, Gross		8,771		8,771			9,103
Accruing loans 90+ days past due							2
Term [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		8,726		8,726
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		36		36
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		9		9
Accruing loans 90+ days past due		1		1
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	43		43			25
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							2,014
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							4
Financing Receivable, Recorded Investment, Past Due		6		6			7
Loans and Leases Receivable, Gross		2,202		2,202			2,021
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		2,196		2,196
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		5		5
Accruing loans 90+ days past due		0		0
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		23,098		23,098			22,740
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		79		79			90
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		68		68			96
Financing Receivable, Recorded Investment, Past Due		147		147			186
Loans and Leases Receivable, Gross		23,245		23,245			22,926
Accruing loans 90+ days past due		3		3			17
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	137		137			204
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							1,271
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		0		0			0
Loans and Leases Receivable, Gross		1,388		1,388			1,271
Accruing loans 90+ days past due							0
Municipal [Member] | Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		1,388		1,388
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
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							7,219
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							29
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							40
Financing Receivable, Recorded Investment, Past Due		41		41			69
Loans and Leases Receivable, Gross		7,365		7,365			7,288
Accruing loans 90+ days past due							4
Owner Occupied [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		7,324		7,324
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		19		19
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		22		22
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	36		36			49
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							363
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		2		2			1
Loans and Leases Receivable, Gross		358		358			364
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		356		356
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		1		1
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	7		7			8
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							13,887
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							60
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							56
Financing Receivable, Recorded Investment, Past Due		104		104			116
Loans and Leases Receivable, Gross		14,134		14,134			14,003
Accruing loans 90+ days past due							13
Commercial And Industrial [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		14,030		14,030
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		59		59
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		45		45
Accruing loans 90+ days past due		3		3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	93		93			146
loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		84		84			44
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			0
Financing Receivable, Recorded Investment, Past Due		0		0			0
Loans and Leases Receivable, Gross		84		84			44
Accruing loans 90+ days past due		0		0			0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0			$ 12
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] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		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
Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0
Accruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0
Nonaccruing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		8	3	9	3
Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		5	0	5	0
Nonaccruing [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		5	3	6	3
Nonaccruing [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1		1
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	$ 3	1	$ 3
Nonaccruing [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Nonaccruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2
Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 1		$ 1
[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 Credi55

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		12 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 8	$ 3	$ 9	$ 3	$ 123
Financing Receivable, Recorded Investment, Current		44,981		44,981			$ 44,497
Loans held for sale		84		84			44
Commercial and industrial		14,134		14,134			14,003
Leasing		358		358			364
Owner occupied		7,365		7,365			7,288
Municipal		1,388		1,388			1,271
Land Development Loans, Loans Receivable Commercial Construction and Land Development		2,202		2,202			2,021
Term		8,771		8,771			9,103
Loans Receivable, Gross, Commercial, Real Estate		10,973		10,973			11,124
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,825		2,825			2,777
1-4 family residential		6,861		6,861			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		661		661			597
Bankcard and other revolving plans		490		490			509
Other		175		175			185
Loans and Leases Receivable, Gross		45,230		45,230			44,780
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		139		139			140
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		110		110			143
Financing Receivable, Recorded Investment, Past Due		249		249			283
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		5		5			22
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	218		218			261
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		11,012		11,012			10,730
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,825		2,825			2,777
1-4 family residential		6,861		6,861			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		661		661			597
Bankcard and other revolving plans		490		490			509
Other		175		175			185
Loans and Leases Receivable, Gross		11,012		11,012			10,730
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							2,021
Term		8,771		8,771			9,103
Loans Receivable, Gross, Commercial, Real Estate		10,973		10,973			11,124
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		14,134		14,134			14,003
Leasing		358		358			364
Owner occupied		7,365		7,365			7,288
Municipal		1,388		1,388			1,271
Loans and Leases Receivable, before Fees, Gross		23,245		23,245			22,926
Loans and Leases Receivable, Gross		23,245		23,245			22,926
Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		43,812		43,812			42,987
Pass [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		10,927		10,927			10,649
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,807		2,807			2,759
1-4 family residential		6,799		6,799			6,602
Loans and Leases Receivable, Gross, Consumer, Construction		659		659			596
Bankcard and other revolving plans		488		488			507
Other		174		174			185
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							2,002
Term		8,551		8,551			8,816
Loans Receivable, Gross, Commercial, Real Estate		10,741		10,741			10,818
Pass [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		13,361		13,361			13,001
Leasing		339		339			342
Owner occupied		7,077		7,077			6,920
Municipal		1,367		1,367			1,257
Loans and Leases Receivable, before Fees, Gross		22,144		22,144			21,520
Special Mention [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		471		471			660
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 and Leases Receivable, Gross, Consumer, Home Equity		0		0			0
1-4 family residential		0		0			0
Loans and Leases Receivable, Gross, Consumer, Construction		0		0			0
Bankcard and other revolving plans		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							15
Term		110		110			138
Loans Receivable, Gross, Commercial, Real Estate		117		117			153
Special Mention [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		288		288			395
Leasing		5		5			6
Owner occupied		59		59			93
Municipal		2		2			13
Loans and Leases Receivable, before Fees, Gross		354		354			507
Allowance for Loan and Lease Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		490		490			518
Allowance for Loan and Lease Losses [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross							44
Allowance for Loan and Lease Losses [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans Receivable, Gross, Commercial, Real Estate		122		122			103
Allowance for Loan and Lease Losses [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		321		321			371
Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		1		1			1
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 and Leases Receivable, Gross, Consumer, Home Equity		0		0			0
1-4 family residential		0		0			0
Loans and Leases Receivable, Gross, Consumer, Construction		0		0			0
Bankcard and other revolving plans		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 Receivable, Gross, Commercial, Real Estate		0		0			0
Doubtful [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		1		1			1
Leasing		0		0			0
Owner occupied		0		0			0
Municipal		0		0			0
Loans and Leases Receivable, before Fees, Gross		1		1			1
Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		946		946			1,132
Substandard [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		85		85			81
Loans and Leases Receivable, Gross, Consumer, Home Equity		18		18			18
1-4 family residential		62		62			60
Loans and Leases Receivable, Gross, Consumer, Construction		2		2			1
Bankcard and other revolving plans		2		2			2
Other		1		1			0
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							4
Term		110		110			149
Loans Receivable, Gross, Commercial, Real Estate		115		115			153
Substandard [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		484		484			606
Leasing		14		14			16
Owner occupied		229		229			275
Municipal		19		19			1
Loans and Leases Receivable, before Fees, Gross		746		746			898
loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		84		84			44
Loans and Leases Receivable, Gross		84		84			44
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			0
Financing Receivable, Recorded Investment, Past Due		0		0			0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0			0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0			12
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							13,887
Loans and Leases Receivable, Gross		14,134		14,134			14,003
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							60
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							56
Financing Receivable, Recorded Investment, Past Due		104		104			116
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing							13
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		10,961		10,961			10,664
Loans and Leases Receivable, Gross		11,012		11,012			10,730
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		23		23			34
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		28		28			32
Financing Receivable, Recorded Investment, Past Due		51		51			66
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1		1			3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	38		38			32
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							184
Loans and Leases Receivable, Gross		175		175			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		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		174		174
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							9,079
Loans and Leases Receivable, Gross		8,771		8,771			9,103
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							13
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							11
Financing Receivable, Recorded Investment, Past Due		45		45			24
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing							2
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							2,014
Loans and Leases Receivable, Gross		2,202		2,202			2,021
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							4
Financing Receivable, Recorded Investment, Past Due		6		6			7
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		2,196		2,196
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		5		5
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]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							363
Loans and Leases Receivable, Gross		358		358			364
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		2		2			1
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							7,219
Loans and Leases Receivable, Gross		7,365		7,365			7,288
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							29
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							40
Financing Receivable, Recorded Investment, Past Due		41		41			69
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing							4
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							1,271
Loans and Leases Receivable, Gross		1,388		1,388			1,271
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		0		0			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		10,922		10,922			11,093
Loans and Leases Receivable, Gross		10,973		10,973			11,124
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		37		37			16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		14		14			15
Financing Receivable, Recorded Investment, Past Due		51		51			31
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1		1			2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	43		43			25
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							2,763
Loans and Leases Receivable, Gross		2,825		2,825			2,777
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							9
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							5
Financing Receivable, Recorded Investment, Past Due		11		11			14
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		23,098		23,098			22,740
Loans and Leases Receivable, Gross		23,245		23,245			22,926
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		79		79			90
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		68		68			96
Financing Receivable, Recorded Investment, Past Due		147		147			186
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		3		3			17
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	137		137			204
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							6,621
Loans and Leases Receivable, Gross		6,861		6,861			6,662
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							25
Financing Receivable, Recorded Investment, Past Due		31		31			41
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing							1
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							590
Loans and Leases Receivable, Gross		661		661			597
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due							6
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due							1
Financing Receivable, Recorded Investment, Past Due		$ 4		$ 4			7
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing							$ 1
[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 Credi56

Loans And Allowance For Credit Losses (Summary Of Information On Impaired Loans) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	$ 2,825		$ 2,825		$ 2,777
Unpaid principal balance	414		414		573
Impaired Financing Receivable, Recorded Investment	333		333		461
Impaired Financing Receivable, Related Allowance	16		16		30
Average recorded investment	330	$ 660	310	$ 611
Interest income recognized	0	13	8	18
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	189		189		293
Impaired Financing Receivable, Recorded Investment	137		137
Impaired Financing Receivable, Related Allowance	8		8		24
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	64		64		120
Impaired Financing Receivable, Recorded Investment	57		57		102
Impaired Financing Receivable, Related Allowance	1		1		2
Average recorded investment	54	109	55	102
Interest income recognized	0	1	8	4
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	254		254		414
Impaired Financing Receivable, Recorded Investment	195		195		325
Impaired Financing Receivable, Related Allowance	9		9		26
Average recorded investment	193	508	182	459
Interest income recognized	0	5	8	8
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					6
Average recorded investment	5	11	5	11
Interest income recognized	0	0	0	0
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	63		63		56
Impaired Financing Receivable, Recorded Investment	57		57		48
Impaired Financing Receivable, Related Allowance	4		4		0
Average recorded investment	58	59	53	60
Interest income recognized	0	7	0	9
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	70		70		64
Impaired Financing Receivable, Recorded Investment	62		62		54
Impaired Financing Receivable, Related Allowance	4		4		0
Average recorded investment	63	70	58	71
Interest income recognized	0	7	0	9
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	18		18		25
Impaired Financing Receivable, Recorded Investment	15		15		22
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	15	21	14	21
Interest income recognized	0	0	0	0
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,825		2,825		2,777
Unpaid principal balance	0		0		1
Impaired Financing Receivable, Recorded Investment	0		0		1
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	0	1	0	1
Interest income recognized	0	0	0	0
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	70		70		67
Impaired Financing Receivable, Recorded Investment	59		59		57
Impaired Financing Receivable, Related Allowance	3		3		4
Average recorded investment	57	58	55	56
Interest income recognized	0	1	0	1
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	2		2		2
Impaired Financing Receivable, Recorded Investment	2		2		2
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	2	2	1	3
Interest income recognized	0	0	0	0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	90		90		95
Impaired Financing Receivable, Recorded Investment	76		76		82
Impaired Financing Receivable, Related Allowance	3		3		4
Average recorded investment	74	82	70	81
Interest income recognized	0	1	0	1
Impaired Financing Receivable Related Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	131		131		218
Impaired Financing Receivable Related Allowance [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	53		53		142
Impaired Financing Receivable Related Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					23
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	71		71		165
Impaired Financing Receivable Related Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					12
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	25		25		14
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					9
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					29
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					1
Impaired Financing Receivable Related Allowance [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	35		35		39
Impaired Financing Receivable Recorded Investment With No Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	202		202		243
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	84		84		80
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	39		39		79
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	124		124		160
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	33		33		36
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	37		37		40
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	13		13		13
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		1
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	27		27		28
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	41		41		43
Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					$ 222
Average recorded investment	138	398
Interest income recognized	$ 0	$ 4
Commercial and Industrial Sector [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Average recorded investment			126	356
Interest income recognized			$ 0	$ 4

Loans And Allowance For Credi57

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		12 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 8	$ 3	$ 9	$ 3	$ 123
1-4 family residential		6,861		6,861			$ 6,662
Construction and other consumer real estate		661		661			597
Commercial and industrial		14,134		14,134			14,003
Home equity credit line		2,825		2,825			2,777
Bankcard and other revolving plans		490		490			509
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		5	0	5	0
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	3	1	3
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		5	3	6	3
Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1		1
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		6,861		6,861			6,662
Construction and other consumer real estate		661		661			597
Home equity credit line		2,825		2,825			2,777
Bankcard and other revolving plans		490		490			509
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1		1
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		104		104			139
Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Commercial and industrial		14		14			47
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		21		21			23
Commercial Municipal Loans		2		2
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		37		37			70
Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1			2
Accruing [Member] | Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment				0
Accruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0
Recorded investment resulting from the following modification types		13		13			14
Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0
Recorded investment resulting from the following modification types		14		14			16
Accruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		12		12			15
Accruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0
1-4 family residential		39		39			36
Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		2		2			2
Accruing [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0
Recorded investment resulting from the following modification types		53		53			53
Accruing [Member] | Interest Rate Below Market [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		7		7			8
Accruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							1
Accruing [Member] | Interest Rate Below Market [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2			1
Accruing [Member] | Interest Rate Below Market [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Accruing [Member] | Interest Rate Below Market [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							6
Accruing [Member] | Interest Rate Below Market [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		4		4			6
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		9		9			6
Accruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							1
Accruing [Member] | Maturity Or Team Extension [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		4		4			3
Accruing [Member] | Maturity Or Team Extension [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Accruing [Member] | Maturity Or Team Extension [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
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			0
Accruing [Member] | Maturity Or Team Extension [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		3		3			3
Accruing [Member] | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		14		14			15
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] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							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		14		14			15
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] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							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]	15		15			22
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]						7
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]	14		14			19
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]						0
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
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			3
Accruing [Member] | Multiple Modification Types [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	58		58			86
Accruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]						14
Accruing [Member] | Multiple Modification Types [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	17		17			47
Accruing [Member] | Multiple Modification Types [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]						2
Accruing [Member] | Multiple Modification Types [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]						7
Accruing [Member] | Multiple Modification Types [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	7		7			9
Accruing [Member] | Multiple Modification Types [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	34		34			30
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		8	3	9	3
Recorded investment resulting from the following modification types		181		181			226
Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		5	0	5	0
Commercial and industrial		47		47			62
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	3	1	3
Recorded investment resulting from the following modification types		10		10			10
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		5	$ 3	6	$ 3
Recorded investment resulting from the following modification types		58		58			73
Nonaccruing [Member] | Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment				2
Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Recorded investment resulting from the following modification types		6		6			5
Nonaccruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2
Recorded investment resulting from the following modification types		6		6			5
Nonaccruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		2		2			1
Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1		1
1-4 family residential		11		11			8
Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		13		13			9
Nonaccruing [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1		1
Recorded investment resulting from the following modification types		77		77			87
Nonaccruing [Member] | Interest Rate Below Market [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		11		11			11
Nonaccruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							1
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		1		1			1
Nonaccruing [Member] | Interest Rate Below Market [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							2
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			2
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		4		4			3
Nonaccruing [Member] | Maturity Or Team Extension [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		18		18			12
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							2
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							1
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		9		9			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		9		9			6
Nonaccruing [Member] | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		18		18			23
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		1		1			5
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		3		3			3
Nonaccruing [Member] | Principal Forgiveness [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		4		4			8
Nonaccruing [Member] | Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		3		3			5
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		2		2			3
Nonaccruing [Member] | Payment Deferral [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types							0
Nonaccruing [Member] | Payment Deferral [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0			0
Nonaccruing [Member] | Payment Deferral [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0			0
Nonaccruing [Member] | Payment Deferral [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		2		2			3
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	28		28			52
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
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]	11		11			29
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]						0
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]	0		0			0
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]	2		2			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]	13		13			30
Nonaccruing [Member] | Multiple Modification Types [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	103		103			123
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							0
Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	34		34			29
Nonaccruing [Member] | Multiple Modification Types [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]						3
Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	3		3			3
Nonaccruing [Member] | Multiple Modification Types [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	8		8			5
Nonaccruing [Member] | Multiple Modification Types [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	45		45			37
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		0		0			0
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		2		2
Commercial Municipal Loans		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		4		4
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		1		1			1
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		0		0			0
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		0		0			0
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		4		4			2
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		0		0
Commercial Municipal Loans		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]
1-4 family residential		0		0			0
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		1		1			1
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		2		2			2
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		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
Commercial Municipal Loans		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]
1-4 family residential		7		7			6
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		0		0			0
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		7		7			9
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		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
Commercial Municipal Loans		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]
1-4 family residential		0		0			1
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		0		0			0
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		0		0			0
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	[1]	4		4			12
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]	10		10
Commercial Municipal Loans		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]
1-4 family residential	[1]	1		1			2
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	[1]	0		0			0
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	[1]	0		0			1
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	[2]	6		6			33
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]	9		9
Commercial Municipal Loans		2		2
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Term [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] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	[2]	30		30			26
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate	[2]	1		1			1
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	[2]	3		3			3
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		0		0			0
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		1		1
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]
1-4 family residential		0		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		0		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		6		6			3
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		2		2
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Municipal [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] | 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]
1-4 family residential		0		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		0		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		1		1			5
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]
1-4 family residential		1		1			2
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		2		2			1
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial		1		1			2
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		1		1
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		0		0
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		0		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		0		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	[1]	10		10			28
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]	0		0
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	[1]	2		2			1
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	[1]	0		0			0
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Commercial and industrial	[2]	29		29			24
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]	5		5
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Municipal [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	3		3
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential	[2]	8		8			5
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line	[2]	$ 0		$ 0			$ 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 Credi58

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		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 8	$ 3	$ 9	$ 3	$ 123
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,825		2,825			$ 2,777
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,825		2,825			$ 2,777
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	3	1	3
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	5	3	6	3
Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2		2
One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1		1
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2		2
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1		1
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	8	3	9	3
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	3	1	3
Nonaccruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	5	3	6	3
Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2		2
Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1		1
Nonaccruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2
Nonaccruing [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1		1
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
Accruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		0
Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0
Accruing [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0		$ 0

Loans And Allowance For Credi59

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		12 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		$ 14,134		$ 14,134			$ 14,003
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		8	$ 3	9	$ 3	$ 123
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,825		2,825			2,777
Loans and Leases Receivable, Gross, Consumer, Mortgage		6,861		6,861			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		661		661			597
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Financing Receivable, Modifications, Recorded Investment		104		104			139
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		8	3	9	3
Financing Receivable, Modifications, Recorded Investment		181		181			226
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		5	0	5	0
Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		14		14			47
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		47		47			62
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		5	0	5	0
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	3	1	3
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		21		21			23
Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	3	1	3
Financing Receivable, Modifications, Recorded Investment		10		10			10
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		5	3	6	3
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		37		37			70
Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		5	$ 3	6	$ 3
Financing Receivable, Modifications, Recorded Investment		58		58			73
Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1			2
Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0
Financing Receivable, Modifications, Recorded Investment		13		13			14
Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Financing Receivable, Modifications, Recorded Investment		6		6			5
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0
Financing Receivable, Modifications, Recorded Investment		14		14			16
Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2
Financing Receivable, Modifications, Recorded Investment		6		6			5
Home Equity Credit Line [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		12		12			15
Home Equity Credit Line [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		2		2			1
One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1		1
One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0
Loans and Leases Receivable, Gross, Consumer, Mortgage		39		39			36
One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1		1
Loans and Leases Receivable, Gross, Consumer, Mortgage		11		11			8
Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		2		2			2
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,825		2,825			2,777
Loans and Leases Receivable, Gross, Consumer, Mortgage		6,861		6,861			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		661		661			597
Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		13		13			9
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1		1
Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0
Financing Receivable, Modifications, Recorded Investment		53		53			53
Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1		1
Financing Receivable, Modifications, Recorded Investment		77		77			87
Interest Rate Below Market [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		7		7			8
Interest Rate Below Market [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		11		11			11
Interest Rate Below Market [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							1
Interest Rate Below Market [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							1
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		2		2			1
Interest Rate Below Market [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1			1
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							6
Interest Rate Below Market [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							2
Interest Rate Below Market [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4		4			6
Interest Rate Below Market [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		3		3			2
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		4		4			3
Maturity Or Team Extension [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		9		9			6
Maturity Or Team Extension [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		18		18			12
Maturity Or Team Extension [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							1
Maturity Or Team Extension [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							2
Maturity Or Team Extension [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment							1
Maturity Or Team Extension [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4		4			3
Maturity Or Team Extension [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		9		9			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							0
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			0
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		3		3			3
Maturity Or Team Extension [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		9		9			6
Principal Forgiveness [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		14		14			15
Principal Forgiveness [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		18		18			23
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		1		1			5
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		3		3			3
Principal Forgiveness [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		14		14			15
Principal Forgiveness [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4		4			8
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		3		3			5
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		2		2			3
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							0
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		0		0			0
Payment Deferral [Member] | Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0			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		2		2			3
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	15		15			22
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	28		28			52
Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]						7
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
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]	14		14			19
Other Recorded Investment Resulting From Following Modification [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	11		11			29
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	[1]						0
Other Recorded Investment Resulting From Following Modification [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]						0
Other Recorded Investment Resulting From Following Modification [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]						0
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]	0		0			0
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]	2		2			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			3
Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	13		13			30
Multiple Modification Types [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	58		58			86
Multiple Modification Types [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	103		103			123
Multiple Modification Types [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]						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							0
Multiple Modification Types [Member] | Commercial Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	17		17			47
Multiple Modification Types [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	34		34			29
Multiple Modification Types [Member] | Commercial Real Estate Portfolio Segment [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]						2
Multiple Modification Types [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]						7
Multiple Modification Types [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]						3
Multiple Modification Types [Member] | Commercial Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	7		7			9
Multiple Modification Types [Member] | Commercial Real Estate [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	3		3			3
Multiple Modification Types [Member] | Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	8		8			5
Multiple Modification Types [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	34		34			30
Multiple Modification Types [Member] | Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	45		45			37
Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		0		0			0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1
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]
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0			0
Nonaccruing [Member] | Interest Rate Below Market [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		0		0			0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		6		6			3
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2		2
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1
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]
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0			0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		0		0			0
Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		1		1			5
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]
Loans and Leases Receivable, Gross, Consumer, Home Equity		2		2			1
Nonaccruing [Member] | Principal Forgiveness [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		1		1			2
Nonaccruing [Member] | Payment Deferral [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		1		1			2
Nonaccruing [Member] | Payment Deferral [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		1		1
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		0		0
Nonaccruing [Member] | Payment Deferral [Member] | Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0			0
Nonaccruing [Member] | Payment Deferral [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		0		0			0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial	[1]	10		10			28
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]	0		0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	[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]
Loans and Leases Receivable, Gross, Consumer, Mortgage	[1]	2		2			1
Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial And Industrial [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial	[2]	29		29			24
Nonaccruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	5		5
Nonaccruing [Member] | Multiple Modification Types [Member] | Municipal [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0
Nonaccruing [Member] | Multiple Modification Types [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	3		3
Nonaccruing [Member] | Multiple Modification Types [Member] | Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	[2]	0		0			0
Nonaccruing [Member] | Multiple Modification Types [Member] | One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	[2]	8		8			5
Accruing [Member] | Interest Rate Below Market [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		0		0			0
Accruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		2		2
Accruing [Member] | Interest Rate Below Market [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		4		4
Accruing [Member] | Interest Rate Below Market [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0			0
Accruing [Member] | Interest Rate Below Market [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		1		1			1
Accruing [Member] | Interest Rate Below Market [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		0		0			0
Accruing [Member] | Maturity Or Team Extension [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		4		4			2
Accruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [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]
Loans and Leases Receivable, Gross, Consumer, Home Equity		2		2			2
Accruing [Member] | Maturity Or Team Extension [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		0		0			0
Accruing [Member] | Maturity Or Team Extension [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		1		1			1
Accruing [Member] | Principal Forgiveness [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		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] | 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]
Loans and Leases Receivable, Gross, Consumer, Home Equity		7		7			9
Accruing [Member] | Principal Forgiveness [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		7		7			6
Accruing [Member] | Principal Forgiveness [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		0		0			0
Accruing [Member] | Payment Deferral [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		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] | 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]
Loans and Leases Receivable, Gross, Consumer, Home Equity		0		0			0
Accruing [Member] | Payment Deferral [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		0		0			1
Accruing [Member] | Payment Deferral [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		0		0			0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial	[1]	4		4			12
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]	10		10
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]
Loans and Leases Receivable, Gross, Consumer, Home Equity	[1]	0		0			1
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	[1]	1		1			2
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction	[1]	0		0			0
Accruing [Member] | Multiple Modification Types [Member] | Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial	[2]	6		6			33
Accruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	9		9
Accruing [Member] | Multiple Modification Types [Member] | Term [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	6		6
Accruing [Member] | Multiple Modification Types [Member] | Home Equity Line of Credit [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	[2]	3		3			3
Accruing [Member] | Multiple Modification Types [Member] | One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	[2]	30		30			26
Accruing [Member] | Multiple Modification Types [Member] | Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction	[2]	$ 1		$ 1			$ 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 Credi60

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, 2018	Dec. 31, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		$ 249	$ 283
Financing Receivable, Recorded Investment, Current		44,981	44,497
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		139	140
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		110	143
Loans and Leases Receivable, Gross		45,230	44,780
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		5	22
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	218	261
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	0
Financing Receivable, Recorded Investment, Current		84	44
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
Loans and Leases Receivable, Gross		84	44
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0	12
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		104	116
Financing Receivable, Recorded Investment, Current			13,887
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			60
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			56
Loans and Leases Receivable, Gross		14,134	14,003
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			13
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		2	1
Financing Receivable, Recorded Investment, Current			363
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		358	364
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		41	69
Financing Receivable, Recorded Investment, Current			7,219
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			29
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			40
Loans and Leases Receivable, Gross		7,365	7,288
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			4
Municipal [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Financing Receivable, Recorded Investment, Past Due		0	0
Financing Receivable, Recorded Investment, Current			1,271
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		1,388	1,271
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		147	186
Financing Receivable, Recorded Investment, Current		23,098	22,740
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		79	90
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		68	96
Loans and Leases Receivable, Gross		23,245	22,926
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		3	17
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	137	204
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		6	7
Financing Receivable, Recorded Investment, Current			2,014
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			4
Loans and Leases Receivable, Gross		2,202	2,021
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		45	24
Financing Receivable, Recorded Investment, Current			9,079
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			13
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			11
Loans and Leases Receivable, Gross		8,771	9,103
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			2
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		51	31
Financing Receivable, Recorded Investment, Current		10,922	11,093
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		37	16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		14	15
Loans and Leases Receivable, Gross		10,973	11,124
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1	2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	43	25
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		11	14
Financing Receivable, Recorded Investment, Current			2,763
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			9
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			5
Loans and Leases Receivable, Gross		2,825	2,777
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		31	41
Financing Receivable, Recorded Investment, Current			6,621
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			25
Loans and Leases Receivable, Gross		6,861	6,662
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			1
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	7
Financing Receivable, Recorded Investment, Current			590
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due			6
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due			1
Loans and Leases Receivable, Gross		661	597
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			1
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		4	3
Financing Receivable, Recorded Investment, Current			506
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			1
Loans and Leases Receivable, Gross		490	509
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing			1
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			184
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		175	185
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		51	66
Financing Receivable, Recorded Investment, Current		10,961	10,664
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		23	34
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		28	32
Loans and Leases Receivable, Gross		11,012	10,730
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1	3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	$ 38	$ 32
[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 He61

Derivative Instruments And Hedging Activities (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Derivative [Line Items]
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion				$ (7)
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net		$ (2)	$ 2	(7)	$ 0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(1)	1	(2)	3
Fair values of derivative assets reduced (increased) by net credit valuation adjustments		1	2	1	2
Total derivatives, Notional amount		6,937		6,937		$ 6,824
Cash collateral pledged for derivative liabilities		47		47
Additional collateral that would be required to be pledge if credit rating was downgraded by one notch		0		0
Derivative Instrument, Noninterest Income (Expense)		9	7	19	11
Derivatives Designated As Hedging Instrument Offset To Interest Expense		0	0	0	0
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities		2	1	2	1
Derivatives Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		1,038		1,038		1,138
Derivatives Designated As Hedging Instruments [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net		(2)	2	(7)	0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	[1]	(1)	1	(2)	3
Total derivatives, Notional amount		1,038		1,038		1,138
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		5,899		5,899		5,686
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Total derivatives, Notional amount		243		243		223
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member]
Derivative [Line Items]
Total derivatives, Notional amount		5,302		5,302		4,550
Derivative Instrument, Noninterest Income (Expense)		4	3	9	4
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member]
Derivative [Line Items]
Total derivatives, Notional amount		354		354		913
Derivative Instrument, Noninterest Income (Expense)		5	$ 4	10	$ 7
Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		70		70		40
Other Liabilities [Member] | Derivatives Designated As Hedging Instruments [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0		0
Other Liabilities [Member] | Derivatives Designated As Hedging Instruments [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0		0
Other Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		70		70		40
Other Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0		0
Other Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		65		65		33
Other Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		5		5		7
Other Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Gross amounts recognized		$ 70		$ 70		$ 40
[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, 2018, we estimate that $(7) million will be reclassified from AOCI into interest income.

Derivative Instruments And He62

Derivative Instruments And Hedging Activities (Schedule Of Notional Amounts And Recorded Gross Fair Values And Related Gain (Loss) Of Derivative Instruments) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Derivative [Line Items]
Total derivatives, Notional amount		$ 6,937		$ 6,937		$ 6,824
Amount of derivative gain (loss), recognized in OCI		(2)	$ 2	(7)	$ 0
Amount of derivative gain (loss), Reclassified from AOCI to interest income		(1)	1	(2)	3
Derivatives instruments, Noninterest income (expense)		9	7	19	11
Derivatives designated as hedging instruments, Offset to interest expense		0	0	0	0
Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		29		29		38
Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		70		70		40
Derivatives Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		1,038		1,038		1,138
Derivatives Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		0		0		0
Derivatives Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		0		0		0
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Total derivatives, Notional amount		1,038		1,038		1,138
Amount of derivative gain (loss), recognized in OCI		(2)	2	(7)	0
Amount of derivative gain (loss), Reclassified from AOCI to interest income	[1]	(1)	1	(2)	3
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		0		0		0
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		0		0		0
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		5,899		5,899		5,686
Derivatives Not Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		29		29		38
Derivatives Not Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		70		70		40
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member]
Derivative [Line Items]
Total derivatives, Notional amount		354		354		913
Derivatives instruments, Noninterest income (expense)		5	4	10	7
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		6		6		9
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		5		5		7
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Total derivatives, Notional amount		243		243		223
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		1		1		1
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		0		0		0
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member]
Derivative [Line Items]
Total derivatives, Notional amount		5,302		5,302		4,550
Derivatives instruments, Noninterest income (expense)		4	$ 3	9	$ 4
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		22		22		28
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		$ 65		$ 65		$ 33
[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, 2018, we estimate that $(7) million will be reclassified from AOCI into interest income.

Debt And Shareholders' Equity63

Debt And Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt And Shareholders' Equity [Line Items]
Schedule of Long-term Debt Instruments [Table Text Block]			Long-term debt is summarized as follows: (In millions) June 30, December 31, 2017 Subordinated notes $ 247 $ 247 Senior notes 135 135 Capital lease obligations 1 1 Total $ 383 $ 383
Subordinated Debt	$ 247		$ 247		$ 247	$ 247
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(175)	$ 75
Stockholders' Equity [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			1	2
Senior Notes	135		135		135	135
Capital Lease Obligations	1		1		1	1
Long-term Debt, Gross	$ 383		$ 383		383	383
Stock Repurchased During Period, Shares	2.1	2.2	4
Stock Repurchased and Retired During Period, Value	$ 120	$ 90	$ (235)	(90)	$ 465
Treasury Stock Acquired, Average Cost Per Share	$ 55.82	$ 41.70	$ 54.64		$ 50.81
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 185		$ 185		$ 185
Net Shares Issued From Stock Warrant Exercises	1.1
Warrants Sold	3.3
Class of Warrant or Right, Outstanding	2.5		2.5		2.5
Warrant Exercise Price	$ 36.27		$ 36.27		$ 36.27
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (315)	$ (49)	$ (315)	(49)	$ (315)	$ (139)	$ (122)
Repayment of Long-term Debt	$ 0	$ 0	$ 0	$ 153
Warrant [Member]
Stockholders' Equity [Abstract]
Class of Warrant or Right, Outstanding	29.3		29.3		29.3
Warrant Exercise Price	$ 35.22		$ 35.22		$ 35.22

Debt And Shareholders' Equity S

Debt And Shareholders' Equity Schedule of Long-Term Debt Instruments (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Subordinated Debt	$ 247	$ 247
Senior Notes	135	135
Capital Lease Obligations	1	1
Long-term Debt, Gross	$ 383	$ 383
Schedule of Long-term Debt Instruments [Table Text Block]	Long-term debt is summarized as follows: (In millions) June 30, December 31, 2017 Subordinated notes $ 247 $ 247 Senior notes 135 135 Capital lease obligations 1 1 Total $ 383 $ 383

Debt And Shareholders' Equity65

Debt And Shareholders' Equity (Schedule Of Changes In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax			$ (58)	$ 45
Income Tax Expense (Benefit)	$ 56	$ 80	126	124
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(175)	75
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(1)	(2)
Beginning balance			(139)	(122)	$ (122)
Other comprehensive income (loss)	(49)	62	(176)	73
Ending balance	(315)	(49)	(315)	(49)	(139)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax			0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax			0	0
Other Comprehensive Income (Loss), Tax			(58)	45
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(175)	73
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0	0
Beginning balance			(114)	(93)	(93)
Other comprehensive income (loss)			(175)	73
Ending balance	(289)	(20)	(289)	(20)	(114)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			0	2
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(1)	(2)
Beginning balance			(2)	2	2
Other comprehensive income (loss)			(1)	0
Ending balance	(3)	2	(3)	2	(2)
Accumulated Defined Benefit Plans Adjustment [Member]
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0	0
Beginning balance			(23)	(31)	(31)
Other comprehensive income (loss)			0	0
Ending balance	(23)	(31)	(23)	$ (31)	(23)
Interest Rate Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Debt And Shareholders' Equity [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	1	1	2		3
Reclassification from AOCI, Current Period, Tax	1	1	1		2
Income Tax Expense (Benefit)	$ 0	$ 0	$ 1		$ 1

Commitments, Guarantees, And 66

Commitments, Guarantees, And Contingent Liabilities (Narrative) (Details) $ in Millions	Jun. 30, 2018USD ($)
Guarantor Obligations [Line Items]
Letters of credit, accrued liability	$ 5
Reserve for unfunded lending commitments	1
Deferred commitment fees	4
Commitments for Private Equity and Other Noninterest-bearing Investments	32
Commitments for Private Equity or Other Non-Interest Bearing Investments Prohibited by the Volcker Rule	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	$ 15

Commitments, Guarantees, And 67

Commitments, Guarantees, And Contingent Liabilities (Schedule Of Guarantees Issued) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Unused Commitments to Extend Credit	$ 20,312	$ 19,583
Commercial Letters Of Credit	15	31
Total Unfunded Lending Commitments	21,209	20,531
Financial [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	699	721
Performance [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	183	$ 196
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	$ 15

Revenue Recognition Revenue R68

Revenue Recognition Revenue Recognitiion Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Fees and Commissions, Depositor Accounts	$ 42	$ 43	$ 84	$ 85
Fees and Commissions, Other	55	56	110	105
Revenue Recognition [Member]
Fees and Commissions, Credit and Debit Cards	34	33	67	67
Fees and Commissions, Depositor Accounts	3	3	5	5
Other Service Charges	4	4	7	7
Fees and Commissions, Other	5	4	10	7
Other Service Charges, Commissions and Fees	$ 46	$ 44	$ 89	$ 86

Revenue Recognition Other Servi

Revenue Recognition Other Service charges, commissions and fees (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Service charges, commissions and fees [Line Items]
Fees and Commissions, Depositor Accounts	$ 42	$ 43	$ 84	$ 85
Fees and Commissions, Other	55	56	110	105
Revenue Recognition [Member]
Other Service charges, commissions and fees [Line Items]
Fees and Commissions, Credit and Debit Cards	34	33	67	67
Fees and Commissions, Depositor Accounts	3	3	5	5
Other Service Charges	4	4	7	7
Fees and Commissions, Other	5	4	10	7
Other Service Charges, Commissions and Fees	$ 46	$ 44	$ 89	$ 86

Revenue Recognition Revenue by

Revenue Recognition Revenue by Operation Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Noninterest income, Customer-related Fees	$ 125	$ 121	$ 247	$ 236
Noninterest Income	138	132	276	264
Fees and Commissions, Depositor Accounts	42	43	84	85
Fees and Commissions, Other	55	56	110	105
Fees and Commissions, Fiduciary and Trust Activities	14	10	25	20
Interest Income (Expense), Net	548	528	1,090	1,017
Zions Bank [Member]
Segment Reporting Information [Line Items]
Noninterest income, Customer-related Fees	38	38	72	71
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	38	38	72	71
Other Real Estate Revenue			0	0
Fees and Commissions, Depositor Accounts	15	16	29	30
Fees and Commissions, Other	18	18	35	34
Fees and Commissions, Fiduciary and Trust Activities	4	4	7	7
Brokerage Commissions Revenue	1	1	3	2
Other Noninterest Income From Contracts With Customers			0	0
Total non-interest income from contracts with customers (ASC 606)	38	39	74	73
Other non-interest income (Non-ASC 606 customer related)	0	(1)	(2)	(2)
Interest Income (Expense), Net	170	165	337	318
Revenues	208	203	409	389
National Bank Of Arizona [Member]
Segment Reporting Information [Line Items]
Noninterest income, Customer-related Fees	9	10	19	19
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	9	10	19	19
Other Real Estate Revenue			0	0
Fees and Commissions, Depositor Accounts	3	3	6	6
Fees and Commissions, Other	3	3	6	6
Fees and Commissions, Fiduciary and Trust Activities	0	0	1	1
Brokerage Commissions Revenue	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)	3	4	6	6
Interest Income (Expense), Net	57	50	111	100
Revenues	66	60	130	119
Nevada State Bank [Member]
Segment Reporting Information [Line Items]
Noninterest income, Customer-related Fees	10	11	19	19
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	10	11	19	19
Other Real Estate Revenue			0	0
Fees and Commissions, Depositor Accounts	4	4	7	7
Fees and Commissions, Other	3	3	6	6
Fees and Commissions, Fiduciary and Trust Activities	1	1	2	1
Brokerage Commissions Revenue	0	0	0	0
Other Noninterest Income From Contracts With Customers			0	0
Total non-interest income from contracts with customers (ASC 606)	8	8	15	14
Other non-interest income (Non-ASC 606 customer related)	2	3	4	5
Interest Income (Expense), Net	38	33	74	64
Revenues	48	44	93	83
Vectra Bank Colorado [Member]
Segment Reporting Information [Line Items]
Noninterest income, Customer-related Fees	6	7	11	12
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	6	7	11	12
Other Real Estate Revenue			0	0
Fees and Commissions, Depositor Accounts	2	2	4	4
Fees and Commissions, Other	2	2	3	3
Fees and Commissions, Fiduciary and Trust Activities	0	0	1	1
Brokerage Commissions Revenue	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	3	3	4
Interest Income (Expense), Net	34	31	66	61
Revenues	40	38	77	73
Commerce Bank Of Washington [Member]
Segment Reporting Information [Line Items]
Noninterest income, Customer-related Fees	1	1	3	2
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	1	1	3	2
Other Real Estate Revenue			0	0
Fees and Commissions, Depositor Accounts	0	0	1	1
Fees and Commissions, Other	1	1	1	1
Fees and Commissions, Fiduciary and Trust Activities	0	0	0	0
Brokerage Commissions Revenue	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	1	0
Interest Income (Expense), Net	13	11	25	22
Revenues	14	12	28	24
Other Segment [Member]
Segment Reporting Information [Line Items]
Noninterest income, Customer-related Fees	11	3	21	18
Other non-interest income (non-customer related)	13	11	28	27
Noninterest Income	24	14	49	45
Other Real Estate Revenue			(1)	0
Fees and Commissions, Depositor Accounts	0	0	1	1
Fees and Commissions, Other	4	2	8	5
Fees and Commissions, Fiduciary and Trust Activities	4	2	6	4
Brokerage Commissions Revenue	2	1	3	3
Other Noninterest Income From Contracts With Customers			0	1
Total non-interest income from contracts with customers (ASC 606)	10	5	18	14
Other non-interest income (Non-ASC 606 customer related)	1	(2)	3	4
Interest Income (Expense), Net	(19)	(6)	(36)	(14)
Revenues	5	8	12	31
Amegy Corporation [Member]
Segment Reporting Information [Line Items]
Noninterest income, Customer-related Fees	31	31	63	59
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	31	31	63	59
Other Real Estate Revenue			0	0
Fees and Commissions, Depositor Accounts	11	11	22	22
Fees and Commissions, Other	9	9	18	19
Fees and Commissions, Fiduciary and Trust Activities	3	2	5	4
Brokerage Commissions Revenue	(1)	(1)	(3)	(3)
Other Noninterest Income From Contracts With Customers			0	0
Total non-interest income from contracts with customers (ASC 606)	22	21	42	42
Other non-interest income (Non-ASC 606 customer related)	9	10	21	17
Interest Income (Expense), Net	126	122	253	235
Revenues	157	153	316	294
California Bank Trust [Member]
Segment Reporting Information [Line Items]
Noninterest income, Customer-related Fees	19	20	39	36
Other non-interest income (non-customer related)	0	0	1	1
Noninterest Income	19	20	40	37
Other Real Estate Revenue			0	0
Fees and Commissions, Depositor Accounts	7	7	14	14
Fees and Commissions, Other	6	6	12	12
Fees and Commissions, Fiduciary and Trust Activities	1	1	2	1
Brokerage Commissions Revenue	1	1	2	2
Other Noninterest Income From Contracts With Customers			0	0
Total non-interest income from contracts with customers (ASC 606)	15	15	30	29
Other non-interest income (Non-ASC 606 customer related)	4	5	9	7
Interest Income (Expense), Net	129	122	260	231
Revenues	148	142	300	268
Consolidated Entities [Member]
Segment Reporting Information [Line Items]
Noninterest income, Customer-related Fees	125	121	247	236
Other non-interest income (non-customer related)	13	11	29	28
Noninterest Income	138	132	276	264
Other Real Estate Revenue			(1)	0
Fees and Commissions, Depositor Accounts	42	43	84	85
Fees and Commissions, Other	46	44	89	86
Fees and Commissions, Fiduciary and Trust Activities	13	10	24	19
Brokerage Commissions Revenue	3	2	5	4
Other Noninterest Income From Contracts With Customers			0	1
Total non-interest income from contracts with customers (ASC 606)	104	99	202	195
Other non-interest income (Non-ASC 606 customer related)	21	22	45	41
Interest Income (Expense), Net	548	528	1,090	1,017
Revenues	$ 686	$ 660	$ 1,365	$ 1,281

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	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1	$ 2	$ 3	$ 4
Expected return on plan assets	(3)	(3)	(6)	(6)
Amortization of net actuarial (gain) loss	1	1	1	2
Net periodic benefit cost (credit)	(1)	1	(1)	1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ 0	$ 1	$ 1	$ 1

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Percent	22.10%	32.30%	22.50%	28.70%
Corporate Federal Income Tax Rate	21.00%	35.00%
Current State and Local Tax Expense (Benefit)		$ 14
Deferred Tax Assets, State Taxes					$ 4
Deferred Tax Assets, Net	$ 149		$ 149		$ 93

Net Earnings per Common Share B

Net Earnings per Common Share Basic and diluted net earnings per common share based on the weighted average outstanding shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 197	$ 168	$ 435	$ 308
Dividends	57	30	104	57
Undistributed Earnings, Basic	140	138	331	251
Undistributed Earnings Applicable to Nonvested Shares	1	1	3	3
Undistributed Earnings (Loss) Available to Common Shareholders, Diluted	139	137	328	248
Distributed Earnings	$ 47	$ 16	$ 86	$ 32
Weighted Average Number of Shares Outstanding, Basic	195,583	201,822	196,149	202,083
Dilutive Effect of Common Stock Warrants	12,640	5,351	12,627	6,159
Dilutive Effect of Stock Options	1,024	1,010	1,083	1,111
Earnings Per Share, Basic	$ 0.95	$ 0.76	$ 2.11	$ 1.39
Net Income (Loss) Available to Common Stockholders, Diluted	$ 186	$ 153	$ 414	$ 280
Weighted Average Number of Shares Outstanding, Diluted	209,247	208,183	209,859	209,353
Earnings Per Share, Diluted	$ 0.89	$ 0.73	$ 1.97	$ 1.34

Net Earnings per Common Share W

Net Earnings per Common Share Weighted average shares of stock awards that were anti-dilutive and not included in the calculation of diluted earnings per share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,709	2,094	1,733	2,108

Operating Segment Information75

Operating Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)Branches	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)Branches	Jun. 30, 2017USD ($)
Segment Reporting Information [Line Items]
Number of community regional banks operating in distinct geographical areas	7		7
Interest Income (Expense), Net	$ 548	$ 528	$ 1,090	$ 1,017
Provision for Loan and Lease Losses	5	7	(35)	30
Interest Income (Expense), after Provision for Loan Loss	543	521	1,125	987
Noninterest Income, Other Operating Income	1	(1)	6	(1)
Noninterest Expense	428	405	840	819
Income (Loss) from Continuing Operations before Income Taxes, Domestic	253	248	561	432
Zions Bank [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	170	165	337	318
Provision for Loan and Lease Losses	4	(2)	2	33
Interest Income (Expense), after Provision for Loan Loss	166	167	335	285
Noninterest Income, Other Operating Income	38	37	73	72
Noninterest Expense	118	109	232	221
Income (Loss) from Continuing Operations before Income Taxes, Domestic	86	95	176	136
Average Loans And Leases	12,633	12,483	12,543	12,486
Average Deposits	15,983	15,982	15,848	16,117
Amegy Corporation [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	126	122	253	235
Provision for Loan and Lease Losses	(11)	7	(56)	8
Interest Income (Expense), after Provision for Loan Loss	137	115	309	227
Noninterest Income, Other Operating Income	31	30	64	59
Noninterest Expense	91	89	170	173
Income (Loss) from Continuing Operations before Income Taxes, Domestic	77	56	203	113
Average Loans And Leases	11,387	10,856	11,379	10,747
Average Deposits	11,060	11,218	10,938	11,268
California Bank Trust [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	129	122	260	231
Provision for Loan and Lease Losses	2	(1)	4	(6)
Interest Income (Expense), after Provision for Loan Loss	127	123	256	237
Noninterest Income, Other Operating Income	19	19	40	36
Noninterest Expense	77	76	154	151
Income (Loss) from Continuing Operations before Income Taxes, Domestic	69	66	142	122
Average Loans And Leases	9,908	9,476	9,919	9,391
Average Deposits	11,181	10,917	11,150	10,919
National Bank Of Arizona [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	57	50	111	100
Provision for Loan and Lease Losses	7	(1)	9	1
Interest Income (Expense), after Provision for Loan Loss	50	51	102	99
Noninterest Income, Other Operating Income	10	10	19	20
Noninterest Expense	38	36	76	73
Income (Loss) from Continuing Operations before Income Taxes, Domestic	22	25	45	46
Average Loans And Leases	4,640	4,246	4,591	4,254
Average Deposits	4,942	4,762	4,863	4,712
Nevada State Bank [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	38	33	74	64
Provision for Loan and Lease Losses	0	0	0	(5)
Interest Income (Expense), after Provision for Loan Loss	38	33	74	69
Noninterest Income, Other Operating Income	10	10	20	20
Noninterest Expense	36	35	73	70
Income (Loss) from Continuing Operations before Income Taxes, Domestic	12	8	21	19
Average Loans And Leases	2,349	2,372	2,349	2,355
Average Deposits	4,314	4,233	4,269	4,222
Vectra Bank Colorado [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	34	31	66	61
Provision for Loan and Lease Losses	2	3	5	0
Interest Income (Expense), after Provision for Loan Loss	32	28	61	61
Noninterest Income, Other Operating Income	6	7	12	12
Noninterest Expense	26	25	53	50
Income (Loss) from Continuing Operations before Income Taxes, Domestic	12	10	20	23
Average Loans And Leases	2,881	2,603	2,837	2,569
Average Deposits	2,784	2,728	2,748	2,759
TCBW [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	13	11	25	22
Provision for Loan and Lease Losses	1	0	2	(1)
Interest Income (Expense), after Provision for Loan Loss	12	11	23	23
Noninterest Income, Other Operating Income	1	1	3	2
Noninterest Expense	5	5	11	10
Income (Loss) from Continuing Operations before Income Taxes, Domestic	8	7	15	15
Average Loans And Leases	1,117	911	1,101	894
Average Deposits	1,048	1,094	1,060	1,097
Other Segment [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	(19)	(6)	(36)	(14)
Provision for Loan and Lease Losses	0	1	(1)	0
Interest Income (Expense), after Provision for Loan Loss	(19)	(7)	(35)	(14)
Noninterest Income, Other Operating Income	23	18	45	43
Noninterest Expense	37	30	71	71
Income (Loss) from Continuing Operations before Income Taxes, Domestic	(33)	(19)	(61)	(42)
Average Loans And Leases	363	296	370	210
Average Deposits	$ 1,584	1,400	$ 1,571	1,180
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	97		97
Idaho [Member] | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	23		23
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 | TCBW [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	1		1
OREGON | TCBW [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	73		73
CALIFORNIA | California Bank And Trust [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	91		91
Consolidated Entities [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	$ 548	528	$ 1,090	1,017
Provision for Loan and Lease Losses	5	7	(35)	30
Interest Income (Expense), after Provision for Loan Loss	543	521	1,125	987
Noninterest Income, Other Operating Income	138	132	276	264
Noninterest Expense	428	405	840	819
Income (Loss) from Continuing Operations before Income Taxes, Domestic	253	248	561	432
Average Loans And Leases	45,278	43,243	45,089	42,906
Average Deposits	$ 52,896	$ 52,334	$ 52,447	$ 52,274