Zions Bancorporation, National Association (ZION) 10-Q 7 Nov 18 2018 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 31, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	zion
Entity Registrant Name	ZIONS BANCORPORATION, NATIONAL ASSOCIATION /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		192,185,109
Entity Emerging Growth Company	false
Entity Small Business	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) shares in Thousands	Sep. 30, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 517,000,000	$ 548,000,000
Money market investments:
Interest-bearing deposits	590,000,000	782,000,000
Federal funds sold and security resell agreements	560,000,000	514,000,000
Investment securities:
Available-for-sale, at fair value	14,625,000,000	15,161,000,000
Trading account, at fair value	176,000,000	148,000,000
Total investment securities	15,552,000,000	16,079,000,000
Loans held for sale	61,000,000	44,000,000
Loans held for investment, net of allowance
Loans and leases, net of unearned income and fees	45,810,000,000	44,780,000,000
Less allowance for loan losses	480,000,000	518,000,000
Loans held for investment, net of allowance	45,330,000,000	44,262,000,000
Other noninterest-bearing investments	1,027,000,000	1,029,000,000
Premises, equipment and software, net	1,111,000,000	1,094,000,000
Goodwill and intangibles	1,015,000,000	1,016,000,000
Other real estate owned	4,000,000	4,000,000
Other assets	964,000,000	916,000,000
Total assets	66,731,000,000	66,288,000,000
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing demand	24,067,000,000	23,886,000,000
Interest-bearing:
Savings and money market	25,462,000,000	25,620,000,000
Total deposits	53,785,000,000	52,621,000,000
Federal funds purchased and other short-term borrowings	3,780,000,000	4,976,000,000
Long-term Debt	879,000,000	383,000,000
Reserve for unfunded lending commitments	58,000,000	58,000,000
Other liabilities	676,000,000	571,000,000
Total liabilities	59,178,000,000	58,609,000,000
Shareholders' equity:
Preferred stock, without par value	566,000,000	566,000,000
Common Stock	192,169	4,445,000,000
Additional Paid-in Capital	4,052,000,000	0
Retained earnings	3,296,000,000	2,807,000,000
Accumulated other comprehensive income (loss)	(361,000,000)	(139,000,000)
Stockholders' Equity	7,553,000,000	7,679,000,000
Total liabilities and shareholders' equity	$ 66,731,000,000	$ 66,288,000,000
Preferred Stock, Shares Authorized	4,400	4,400
Common Stock, Shares Authorized	350,000	350,000
Common Stock, Shares, Issued	192,169	197,532
Common Stock, Shares, Outstanding	192,169	197,532
Fair Value, Inputs, Level 2 [Member]
Investment securities:
Held-to-maturity, at amortized cost	$ 751,000,000	$ 770,000,000
Trading account, at fair value	57,000,000	148,000,000
Interest-bearing:
Time	4,256,000,000	3,115,000,000
Long-term Debt	$ 879,000,000	$ 383,000,000

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Preferred Stock, Shares Authorized	4,400	4,400
Common Stock, Shares Authorized	350,000	350,000
Common Stock, Par or Stated Value Per Share	$ 0.0010
Common Stock, Shares, Issued	192,169	197,532
Held-to-maturity, fair value	$ 734
Common stock, outstanding shares	192,169	197,532
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Held-to-maturity, fair value	$ 734	$ 762

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest income:
Interest and Fees and Loans	$ 537	$ 468	$ 1,548	$ 1,370
Interest on Money Market Investments	8	5	20	14
Interest on Securities	86	84	257	246
Total Interest Income	631	557	1,825	1,630
Interest expense:
Interest on Deposits	38	15	87	43
Interest on short- and long-term borrowings	28	20	84	48
Total Interest Expense	66	35	171	91
Net interest income	565	522	1,654	1,539
Provision for loan losses	(11)	5	(46)	35
Net interest income after provision for loan losses	576	517	1,700	1,504
Noninterest income:
Service charges and fees on deposit accounts	42	42	125	127
Other service charges, commissions, and fees	59	55	168	160
Wealth management and trust income	12	11	38	30
Loan Sales and Servicing Income	5	6	18	19
Capital markets and foreign exchange	7	8	23	21
Customer-related Fees	125	122	372	357
Dividends and Other Investment Income	11	9	34	31
Securities Gains (Losses), Net	(1)	5	(1)	13
Other	1	3	7	3
Noninterest Income	136	139	412	404
Noninterest expense:
Salaries and Employee Benefits	264	251	800	753
Occupancy, Net	33	35	96	101
Furniture, Equipment, and Software, Net	30	32	95	96
Other real estate expense, net	(1)	1	(1)	1
Credit-Related Expense	5	7	19	23
Provision for unfunded lending commitments	0	(4)	0	(6)
Professional and Legal Fees	12	15	37	43
Advertising	8	6	20	17
FDIC Premiums	18	15	44	40
Other	49	57	147	166
Total Noninterest Expense	420	413	1,259	1,232
Income Before Income Taxes	292	243	853	676
Income taxes	69	83	195	207
Net income	223	160	658	469
Preferred Stock Dividends	(8)	(8)	(25)	(30)
Preferred Stock Redemption	0	0	0	(3)
Net Earnings Available to Common Shareholders	$ 215	$ 152	$ 633	$ 436
Weighted average common shares outstanding during the period:
Weighted Average Number of Shares Outstanding, Basic	192,973	200,332	195,079	201,493
Weighted Average Number of Shares Outstanding, Diluted	205,765	209,106	208,657	209,366
Earnings Per Share, Basic	$ 1.11	$ 0.75	$ 3.22	$ 2.14
Earnings Per Share, Diluted	$ 1.04	$ 0.72	$ 3.01	$ 2.06

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income for the period	$ 223	$ 160	$ 658	$ 469
Other comprehensive income (loss), net of tax:
Unrealized holding gains (losses) on investment securities	(45)	(8)	(221)	65
Net unrealized gains on other noninterest-bearing investments	0	0	3	2
Net unrealized holding gains (losses) on derivative instruments	(1)	0	(6)	0
Reclassification adjustment for increase in interest income recognized in earnings on derivatives instruments	1	0	2	(2)
Other comprehensive income (loss)	(45)	(8)	(222)	65
Comprehensive income	$ 178	$ 152	$ 436	$ 534

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)
Additional Paid-in Capital			$ 0
Balance (in shares) at Dec. 31, 2016			203,085
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for the period	469			469
Other comprehensive income, net of tax	65				65
Preferred Stock Redemption	(144)	(144)	$ 2	(2)
Stock Issued During Period, Value, Conversion of Convertible Securities
Stock Repurchased and Retired During Period, Value	(217)		$ (217)
Company Common Stock Repurchased, Shares			(4,975)
Net activity under employee plans and related tax benefits	42		$ 42
Net activity under employee plans and related tax benefits, shares			1,602
Dividends on preferred stock	(30)			(30)
Dividends on common stock	(58)			(58)
Balance (in shares) at Sep. 30, 2017			199,712
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity	7,761	566	$ 4,552	2,700	(57)
Additional Paid-in Capital			0
Stockholders' Equity	7,679	566	4,445	2,807	(139)
Additional Paid-in Capital	$ 0			0
Common Stock, Adjustments			(4,052)
Adjustments to Additional Paid in Capital, Other			$ 4,052
Balance (in shares) at Dec. 31, 2017	197,532		197,532
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for the period	$ 658			658
Other comprehensive income, net of tax	(222)				(222)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	1			1
Stock Repurchased and Retired During Period, Value	(434)		$ (434)
Net Shares Issued From Stock Warrant Exercises			1,278
Stock Issued During Period, Value, Stock Options Exercised
Company Common Stock Repurchased, Shares	8,000		(8,050)
Net activity under employee plans and related tax benefits	$ 41		$ 41
Net activity under employee plans and related tax benefits, shares			1,409
Dividends on preferred stock	(25)			(25)
Dividends on common stock	$ (145)			(145)
Balance (in shares) at Sep. 30, 2018	192,169		192,169
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity	$ 7,553	$ 566	$ 0	$ 3,296	$ (361)
Additional Paid-in Capital	$ 4,052		$ 4,052

Consolidated Statements Of Ch_2

Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Common Stock, Dividends, Per Share, Declared	$ 0.74	$ 0.28

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income for the period	$ 223	$ 160	$ 658	$ 469
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	(11)	1	(46)	29
Depreciation and amortization	49	47	141	131
Share-based Compensation	4	4	22	21
Deferred income tax expense (benefit)	(6)	(4)	(4)	4
Net decrease (increase) in trading securities	31	5	(28)	59
Net decrease (increase) in loans held for sale	2	(18)	(32)	71
Change in other liabilities	20	84	105	63
Change in other assets	79	(42)	27	(9)
Other, net	(4)	(10)	(18)	(35)
Net cash provided by operating activities	387	227	825	803
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in money market investments	106	363	146	748
Proceeds from maturities and paydowns of investment securities held-to-maturity	170	83	284	249
Purchases of investment securities held-to-maturity	(43)	(54)	(265)	(127)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	992	615	2,396	1,775
Purchases of investment securities available-for-sale	(1,084)	(535)	(2,260)	(4,001)
Net change in loans and leases	(550)	(475)	(981)	(1,511)
Net change in other noninterest-bearing investments	33	14	29	(89)
Purchases of premises and equipment	(36)	(39)	(90)	(133)
Other, net	2	4	2	12
Net cash used in investing activities	(410)	(24)	(739)	(3,077)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	204	(278)	1,169	(1,136)
Net change in short-term funds borrowed	(377)	(718)	804	1,297
Proceeds from debt over 90 days and up to one year	0	1,850	0	3,600
Repayments of debt over 90 days and up to one year	0	(850)	(2,000)	(1,100)
Cash paid for preferred stock redemption	0	0	0	(144)
Proceeds from the issuance of long-term debt	497	0	497	0
Repayment of long-term debt	0	0	0	(153)
Proceeds from Issuance of Common Stock	2	2	19	20
Dividends paid on common and preferred stock	(68)	(34)	(172)	(89)
Bank common stock repurchased	(186)	(115)	(434)	(217)
Net cash provided by (used in) financing activities	72	(143)	(117)	2,078
Net increase (decrease) in cash and due from banks	49	60	(31)	(196)
Cash and due from banks at beginning of period	468	481	548	737	$ 737
Cash and due from banks at end of period	517	541	517	541	548
Cash paid for interest	57	27	157	79
Net cash paid for income taxes	51	84	142	206
Loans Held for Investment Transferred to Other Real Estate Owned	0	1	6	5
Loans Held for Investment Reclassified to Loans Held for Sale, Net	(1)	(3)	(38)	$ (14)
Available for sale securities purchased, not settled	$ 1	$ 25	$ 1		$ 25

Basis of Presentaion

Basis of Presentaion	9 Months Ended
	Sep. 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, National Association and its majority-owned subsidiaries (collectively “Zions Bancorporation, N.A.,” “the Bank,” “we,” “our,” “us”) have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. References to GAAP, including standards promulgated by the Financial Accounting Standards Board, are made according to sections of the Accounting Standards Codification (“ASC”). Changes to the ASC are made with Accounting Standards Updates (“ASU”) that include consensus issues of the Emerging Issues Task Force. Operating results for the nine months ended September 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 Bank’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, N.A. is a commercial bank headquartered in Salt Lake City, Utah. The Bank provides 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.

Certain Recent Accounting Prono

Certain Recent Accounting Pronouncements (Notes)	9 Months Ended
	Sep. 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 Bank 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 Bank’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 Bank’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 U.S. 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 Bank. 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 Bank’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 Bank 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 Bank’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 not yet adopted by the Bank (continued) ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement The purpose of this standard is to improve the effectiveness of disclosures in the notes to the financial statements. The update outlines removals, modifications, and additions to the disclosure requirements on fair value measurement. January 1, 2020 This standard will not have a material impact to the financial statements as its only impact is to the disclosure requirements for fair value measurement. We will update the impacted disclosures at the effective date. ASU 2018-15, Intangibles – Goodwill and Other-Internal-Use Software (Topic 350-40): Customer’s Accounting for Implementation Cost Incurred in a Cloud Computing Arrangement That Is a Service Contract The standard provides revised accounting guidance related to the accounting for implementation costs associated with cloud computing arrangements that meet the criteria for a service contract. Some of the main provisions include: The amortization period will be the noncancelable hosting contract term plus any expected renewal periods. Entity in a hosting arrangement that is a service contract must provide certain qualitative and quantitative disclosures. Disclosures would also include implementation costs incurred for internal-use software. For transition there is an option to either apply guidance retrospectively or prospectively. January 1, 2020 We are currently evaluating the potential impact of this new guidance on the Bank’s financial statements. Standard Description Date of adoption Effect on the financial statements or other significant matters Standards adopted by the Bank 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 Bank’s consolidated financial statements. New disclosures are found in Footnote 10. Standard Description Date of adoption Effect on the financial statements or other significant matters Standards adopted by the Bank (continued) 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	9 Months Ended
	Sep. 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 Bank’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) September 30, 2018 Level 1 Level 2 Level 3 Total ASSETS Investment securities: Available-for-sale: 1 U.S. Treasury, agencies and corporations $ 25 $ 13,292 $ — $ 13,317 Municipal securities 1,284 1,284 Other debt securities 24 24 Total Available-for-sale 25 14,600 — 14,625 Trading account 119 57 176 Other noninterest-bearing investments: Bank-owned life insurance 516 516 Private equity investments 103 103 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 18 18 Foreign currency exchange contracts 4 4 Total Assets $ 256 $ 15,192 $ 121 $ 15,569 LIABILITIES Securities sold, not yet purchased $ 49 $ — $ — $ 49 Other liabilities: Deferred compensation plan obligations 108 108 Derivatives: Interest rate swaps for customers 73 73 Foreign currency exchange contracts 3 3 Total Liabilities $ 160 $ 73 $ — $ 233 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 the Bank’s 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 Nine Months Ended September 30, 2018 September 30, 2017 September 30, 2018 September 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 $ 102 $ 18 $ 82 $ 19 $ 95 $ 18 $ 73 $ 20 Securities gains (losses), net (1 ) — 5 — — — 7 — Other noninterest income — — — — — — — (1 ) Purchases 2 — 6 — 8 — 18 — Redemptions and paydowns — — — — — — (5 ) — Balance at end of period $ 103 $ 18 $ 93 $ 19 $ 103 $ 18 $ 93 $ 19 No transfers of assets or liabilities occurred among Levels 1, 2 or 3 for the three and nine months ended September 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 Nine 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 September 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 — 23 — 23 — 9 — 9 Other real estate owned — 1 — 1 — — — — Total $ — $ 24 $ — $ 24 $ — $ 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 Nine Months Ended 2018 2017 2018 2017 ASSETS Private equity investments $ — $ — $ — $ (1 ) Impaired loans (9 ) (1 ) (15 ) (8 ) Other real estate owned — — (1 ) — Total $ (9 ) $ (1 ) $ (16 ) $ (9 ) During the three months ended September 30 , we recognized an insignificant amount of net gains in 2018 and $1 million 2017 from the sale of other real estate owned (“OREO”) properties. During the nine months ended September 30 , we recognized approximately $1 million of net gains in 2018 and $2 million in 2017 from the sale of OREO properties that had a carrying value at the time of sale of approximately $3 million and $5 million during the nine months ended September 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 $11 million at September 30, 2018 and $10 million at December 31, 2017 . Amounts of other noninterest-bearing investments carried at cost were $311 million at September 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 $34 million at September 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: September 30, 2018 December 31, 2017 (In millions) Carrying value Estimated fair value Level Carrying value Estimated fair value Level Financial assets: HTM investment securities $ 751 $ 734 2 $ 770 $ 762 2 Loans and leases (including loans held for sale), net of allowance 45,391 44,452 3 44,306 44,226 3 Financial liabilities: Time deposits 4,256 4,231 2 3,115 3,099 2 Other short-term borrowings 2,900 2,900 2 3,600 3,600 2 Long-term debt 879 885 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)	9 Months Ended
	Sep. 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: September 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 $ 781 $ (221 ) $ 560 $ — $ — $ 560 Derivatives (included in other assets) 23 — 23 (13 ) (8 ) 2 Total assets $ 804 $ (221 ) $ 583 $ (13 ) $ (8 ) $ 562 Liabilities: Federal funds and other short-term borrowings $ 4,001 $ (221 ) $ 3,780 $ — $ — $ 3,780 Derivatives (included in other liabilities) 76 — 76 (13 ) — 63 Total Liabilities $ 4,077 $ (221 ) $ 3,856 $ (13 ) $ — $ 3,843 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 Bank’s balance sheet. See Note 7 for further information regarding derivative instruments.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 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. September 30, 2018 (In millions) Amortized cost Gross unrealized gains Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 751 $ 4 $ 21 $ 734 Available-for-sale U.S. Treasury securities 25 — — 25 U.S. Government agencies and corporations: Agency securities 1,480 — 32 1,448 Agency guaranteed mortgage-backed securities 10,159 6 341 9,824 Small Business Administration loan-backed securities 2,069 1 50 2,020 Municipal securities 1,313 1 30 1,284 Other debt securities 25 — 1 24 Total available-for-sale 15,071 8 454 14,625 Total investment securities $ 15,822 $ 12 $ 475 $ 15,359 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 September 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. September 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 $ 201 $ 199 $ 1,572 $ 1,528 Due after one year through five years 356 349 4,874 4,733 Due after five years through ten years 139 135 4,650 4,509 Due after ten years 55 51 3,975 3,855 Total $ 751 $ 734 $ 15,071 $ 14,625 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: September 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 $ 227 $ 17 $ 343 $ 21 $ 570 Available-for-sale U.S. Treasury securities — 25 — — — 25 U.S. Government agencies and corporations: Agency securities 20 970 12 354 32 1,324 Agency guaranteed mortgage-backed securities 92 3,821 249 5,354 341 9,175 Small Business Administration loan-backed securities 25 1,414 25 559 50 1,973 Municipal securities 15 834 15 331 30 1,165 Other — — 1 14 1 14 Total available-for-sale 152 7,064 302 6,612 454 13,676 Total $ 156 $ 7,291 $ 319 $ 6,955 $ 475 $ 14,246 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 September 30, 2018 and December 31, 2017 , respectively, 676 and 667 HTM and 3,018 and 2,262 AFS investment securities were in an unrealized loss position. Other-Than-Temporary Impairment The Bank did not recognize any other-than-temporary impairment (“OTTI”) on its investment securities portfolio during the first nine 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 September 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 September 30, Nine Months Ended September 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 $ 5 $ 5 $ — $ 9 $ 10 $ 20 $ 7 Net gains (losses) 1 $ (1 ) $ 5 $ (1 ) $ 13 1 Net gains (losses) were recognized in securities gains (losses), net in the statement of income. Interest income by security type is as follows: Three Months Ended September 30, (In millions) 2018 2017 Taxable Nontaxable Total Taxable Nontaxable Total Investment securities: Held-to-maturity $ 3 $ 4 $ 7 $ 2 $ 3 $ 5 Available-for-sale 73 6 79 72 6 78 Trading — — — 1 — 1 Total $ 76 $ 10 $ 86 $ 75 $ 9 $ 84 Nine Months Ended September 30, (In millions) 2018 2017 Taxable Nontaxable Total Taxable Nontaxable Total Investment securities: Held-to-maturity $ 8 $ 11 $ 19 $ 7 $ 10 $ 17 Available-for-sale 216 19 235 209 18 227 Trading 3 — 3 2 — 2 Total $ 227 $ 30 $ 257 $ 218 $ 28 $ 246 Investment securities with a carrying value of $2.1 billion at both September 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 Bank’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 from holding PEIs, except for SBIC funds and certain other permitted exclusions, beyond a required deadline. Of the recorded PEIs of $148 million at September 30, 2018 , approximately $3 million remain prohibited by the Volcker Rule. At September 30, 2018 , we have $31 million of unfunded commitments for PEIs, of which approximately $2 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	9 Months Ended
	Sep. 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) September 30, December 31, Loans held for sale $ 61 $ 44 Commercial: Commercial and industrial $ 14,096 $ 14,003 Leasing 332 364 Owner-occupied 7,548 7,288 Municipal 1,563 1,271 Total commercial 23,539 22,926 Commercial real estate: Construction and land development 2,295 2,021 Term 8,752 9,103 Total commercial real estate 11,047 11,124 Consumer: Home equity credit line 2,884 2,777 1-4 family residential 7,039 6,662 Construction and other consumer real estate 644 597 Bankcard and other revolving plans 483 509 Other 174 185 Total consumer 11,224 10,730 Total loans 1 $ 45,810 $ 44,780 1 Loans are presented net of unearned income, unamortized purchase discounts and premiums, and net deferred loan fees and costs totaling $42 million and $43 million at September 30, 2018 and December 31, 2017, respectively. Municipal loans generally include loans to state and local governments (“municipalities”) with the debt service being repaid from general funds or pledged revenues of the municipal entity, or to private commercial entities or 501(c)(3) not-for-profit entities utilizing a pass-through municipal entity to achieve favorable tax treatment. Land development loans included in the construction and land development loan class were $224 million at September 30, 2018 and $220 million at December 31, 2017 . Loans with a carrying value of approximately $23.4 billion at September 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 $152 million and $464 million for the three and nine months ended September 30, 2018 and $146 million and $696 million for the three and nine months ended September 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 $184 million and $584 million for the three and nine months ended September 30, 2018 and $176 million and $640 million for the three and nine months ended September 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 September 30, 2018 and December 31, 2017 . Income from loans sold, excluding servicing, was $3 million and $10 million for the three and nine months ended September 30, 2018 , and $1 million and $9 million for the three and nine months ended September 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 September 30, 2018 (In millions) Commercial Commercial real estate Consumer Total Allowance for loan losses Balance at beginning of period $ 321 $ 122 $ 47 $ 490 Provision for loan losses (11 ) (5 ) 5 (11 ) Gross loan and lease charge-offs 8 5 4 17 Recoveries 12 3 3 18 Net loan and lease charge-offs (recoveries) (4 ) 2 1 (1 ) Balance at end of period $ 314 $ 115 $ 51 $ 480 Reserve for unfunded lending commitments Balance at beginning of period $ 43 $ 15 $ — $ 58 Provision for unfunded lending commitments (1 ) 1 — — Balance at end of period $ 42 $ 16 $ — $ 58 Total allowance for credit losses at end of period Allowance for loan losses $ 314 $ 115 $ 51 $ 480 Reserve for unfunded lending commitments 42 16 — 58 Total allowance for credit losses $ 356 $ 131 $ 51 $ 538 Nine Months Ended September 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 (69 ) 9 14 (46 ) Gross loan and lease charge-offs 38 5 13 56 Recoveries 50 8 6 64 Net loan and lease charge-offs (recoveries) (12 ) (3 ) 7 (8 ) Balance at end of period $ 314 $ 115 $ 51 $ 480 Reserve for unfunded lending commitments Balance at beginning of period $ 48 $ 10 $ — $ 58 Provision for unfunded lending commitments (6 ) 6 — — Balance at end of period $ 42 $ 16 $ — $ 58 Total allowance for credit losses at end of period Allowance for loan losses $ 314 $ 115 $ 51 $ 480 Reserve for unfunded lending commitments 42 16 — 58 Total allowance for credit losses $ 356 $ 131 $ 51 $ 538 Three Months Ended September 30, 2017 (In millions) Commercial Commercial real estate Consumer Total Allowance for loan losses Balance at beginning of period $ 393 $ 116 $ 35 $ 544 Provision for loan losses (4 ) (7 ) 16 5 Gross loan and lease charge-offs 16 4 5 25 Recoveries 12 2 3 17 Net loan and lease charge-offs (recoveries) 4 2 2 8 Balance at end of period $ 385 $ 107 $ 49 $ 541 Reserve for unfunded lending commitments Balance at beginning of period $ 53 $ 10 $ — $ 63 Provision for unfunded lending commitments (4 ) — — (4 ) Balance at end of period $ 49 $ 10 $ — $ 59 Total allowance for credit losses at end of period Allowance for loan losses $ 385 $ 107 $ 49 $ 541 Reserve for unfunded lending commitments 49 10 — 59 Total allowance for credit losses $ 434 $ 117 $ 49 $ 600 Nine Months Ended September 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 27 (15 ) 23 35 Gross loan and lease charge-offs 98 6 13 117 Recoveries 36 12 8 56 Net loan and lease charge-offs (recoveries) 62 (6 ) 5 61 Balance at end of period $ 385 $ 107 $ 49 $ 541 Reserve for unfunded lending commitments Balance at beginning of period $ 54 $ 11 $ — $ 65 Provision for unfunded lending commitments (5 ) (1 ) — (6 ) Balance at end of period $ 49 $ 10 $ — $ 59 Total allowance for credit losses at end of period Allowance for loan losses $ 385 $ 107 $ 49 $ 541 Reserve for unfunded lending commitments 49 10 — 59 Total allowance for credit losses $ 434 $ 117 $ 49 $ 600 The ALLL and outstanding loan balances according to the Bank’s impairment method are summarized as follows: September 30, 2018 (In millions) Commercial Commercial real estate Consumer Total Allowance for loan losses: Individually evaluated for impairment $ 10 $ 1 $ 3 $ 14 Collectively evaluated for impairment 304 114 48 466 Purchased loans with evidence of credit deterioration — — — — Total $ 314 $ 115 $ 51 $ 480 Outstanding loan balances: Individually evaluated for impairment $ 201 $ 65 $ 74 $ 340 Collectively evaluated for impairment 23,338 10,982 11,150 45,470 Purchased loans with evidence of credit deterioration — — — — Total $ 23,539 $ 11,047 $ 11,224 $ 45,810 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) September 30, December 31, Loans held for sale $ — $ 12 Commercial: Commercial and industrial $ 112 $ 195 Leasing 2 8 Owner-occupied 66 90 Municipal 1 1 Total commercial 181 294 Commercial real estate: Construction and land development — 4 Term 46 36 Total commercial real estate 46 40 Consumer: Home equity credit line 13 13 1-4 family residential 47 55 Construction and other consumer real estate — — Bankcard and other revolving plans 1 — Other — — Total consumer loans 61 68 Total $ 288 $ 402 Past due loans (accruing and nonaccruing) are summarized as follows: September 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 $ 61 $ — $ — $ — $ 61 $ — $ — Commercial: Commercial and industrial $ 14,006 $ 40 $ 50 $ 90 $ 14,096 $ 6 $ 63 Leasing 331 — 1 1 332 — 1 Owner-occupied 7,500 26 22 48 7,548 2 41 Municipal 1,563 — — — 1,563 — 1 Total commercial 23,400 66 73 139 23,539 8 106 Commercial real estate: Construction and land development 2,295 — — — 2,295 — — Term 8,728 16 8 24 8,752 3 32 Total commercial real estate 11,023 16 8 24 11,047 3 32 Consumer: Home equity credit line 2,872 5 7 12 2,884 — 4 1-4 family residential 7,008 15 16 31 7,039 — 23 Construction and other consumer real estate 634 10 — 10 644 — — Bankcard and other revolving plans 478 3 2 5 483 1 — Other 173 1 — 1 174 — — Total consumer loans 11,165 34 25 59 11,224 1 27 Total $ 45,588 $ 116 $ 106 $ 222 $ 45,810 $ 12 $ 165 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: September 30, 2018 (In millions) Pass Special Mention Sub- standard Doubtful Total loans Total allowance Commercial: Commercial and industrial $ 13,416 $ 311 $ 369 $ — $ 14,096 Leasing 318 10 4 — 332 Owner-occupied 7,253 84 211 — 7,548 Municipal 1,536 4 23 — 1,563 Total commercial 22,523 409 607 — 23,539 $ 314 Commercial real estate: Construction and land development 2,284 11 — — 2,295 Term 8,631 18 103 — 8,752 Total commercial real estate 10,915 29 103 — 11,047 115 Consumer: Home equity credit line 2,866 — 18 — 2,884 1-4 family residential 6,988 — 51 — 7,039 Construction and other consumer real estate 642 — 2 — 644 Bankcard and other revolving plans 480 — 3 — 483 Other 174 — — — 174 Total consumer loans 11,150 — 74 — 11,224 51 Total $ 44,588 $ 438 $ 784 $ — $ 45,810 $ 480 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 September 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 nine months ended September 30, 2018 and 2017 : September 30, 2018 (In millions) Unpaid principal balance Recorded investment Total recorded investment Related allowance with no allowance with allowance Commercial: Commercial and industrial $ 170 $ 72 $ 47 $ 119 $ 8 Owner-occupied 66 39 21 60 2 Municipal 1 1 — 1 — Total commercial 237 112 68 180 10 Commercial real estate: Construction and land development 1 — 1 1 — Term 59 44 5 49 — Total commercial real estate 60 44 6 50 — Consumer: Home equity credit line 16 12 2 14 3 1-4 family residential 70 33 26 59 — Construction and other consumer real estate 2 1 — 1 — Other — — — — — Total consumer loans 88 46 28 74 3 Total $ 385 $ 202 $ 102 $ 304 $ 13 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 Nine Months Ended (In millions) Average recorded investment Interest income recognized Average recorded investment Interest income recognized Commercial: Commercial and industrial $ 124 $ — $ 108 $ — Owner-occupied 51 — 46 8 Municipal 1 — 1 — Total commercial 176 — 155 8 Commercial real estate: Construction and land development 1 — 1 — Term 49 — 50 1 Total commercial real estate 50 — 51 1 Consumer: Home equity credit line 14 — 13 — 1-4 family residential 58 — 53 — Construction and other consumer real estate 1 — 1 — Other — — — — Total consumer loans 73 — 67 — Total $ 299 $ — $ 273 $ 9 Three Months Ended Nine Months Ended (In millions) Average recorded investment Interest income recognized Average recorded investment Interest income recognized Commercial: Commercial and industrial $ 356 $ 1 $ 311 $ 5 Owner-occupied 104 2 101 5 Municipal 1 — 1 — Total commercial 461 3 413 10 Commercial real estate: Construction and land development 10 — 11 — Term 53 1 58 11 Total commercial real estate 63 1 69 11 Consumer: Home equity credit line 21 — 21 1 1-4 family residential 53 1 53 1 Construction and other consumer real estate 2 — 2 — Other 1 — 1 — Total consumer loans 77 1 77 2 Total $ 601 $ 5 $ 559 $ 23 Modified and Restructured Loans Loans may be modified in the normal course of business for competitive reasons or to strengthen the Bank’s position. Loan modifications and restructurings may also occur when the borrower experiences financial difficulty and needs temporary or permanent relief from the original contractual terms of the loan. Loans that have been modified to accommodate a borrower who is experiencing financial difficulties, and for which the Bank has granted a concession that it would not otherwise consider, are considered troubled debt restructurings (“TDRs”). For further discussion of our policies and processes regarding TDRs, see Note 6 of our 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: September 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 $ — $ — $ 15 $ 7 $ 26 Owner-occupied 1 2 — — 1 16 20 Municipal — — — — — — — Total commercial 1 6 — — 16 23 46 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 8 — — 3 13 1-4 family residential 1 1 6 — 2 30 40 Construction and other consumer real estate — — — — — 1 1 Total consumer loans 1 3 14 — 2 34 54 Total accruing 6 11 14 1 18 64 114 Nonaccruing Commercial: Commercial and industrial — 6 1 1 12 38 58 Owner-occupied 1 2 — 1 1 5 10 Municipal — — — — — 1 1 Total commercial 1 8 1 2 13 44 69 Commercial real estate: Term 3 — — 2 4 1 10 Total commercial real estate 3 — — 2 4 1 10 Consumer: Home equity credit line — — 1 — — — 1 1-4 family residential — — 1 — 1 8 10 Total consumer loans — — 2 — 1 8 11 Total nonaccruing 4 8 3 4 18 53 90 Total $ 10 $ 19 $ 17 $ 5 $ 36 $ 117 $ 204 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 $5 million at September 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 $90 million at September 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 nine months ended September 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 Nine Months Ended (In millions) Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial: Commercial and industrial $ — $ 1 $ 1 $ — $ 5 $ 5 Owner-occupied — — — — 1 1 Total commercial — 1 1 — 6 6 Commercial real estate: Term 2 — 2 2 — 2 Total commercial real estate 2 — 2 2 — 2 Total $ 2 $ 1 $ 3 $ 2 $ 6 $ 8 Three Months Ended Nine Months Ended (In millions) Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial: Commercial and industrial $ — $ 1 $ 1 $ — $ 1 $ 1 Owner-occupied — — — — 1 1 Total commercial — 1 1 — 2 2 Total $ — $ 1 $ 1 $ — $ 2 $ 2 Note: Total loans modified as TDRs during the 12 months previous to September 30, 2018 and 2017 were $99 million and $84 million , respectively. At September 30, 2018 and December 31, 2017 , the amount of foreclosed residential real estate property held by the Bank 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 $10 million for both periods, 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 Bank’s derivative transactions.

Derivative Instruments And Hedg

Derivative Instruments And Hedging Activities	9 Months Ended
	Sep. 30, 2018
Summary of Derivative Instruments [Abstract]
Derivative Instruments And Hedging Activities	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES Objectives and Accounting The Bank is exposed to certain risk arising from both its business operations and economic conditions. Our objectives in using derivatives are to add stability to interest income or expense, to modify the duration of specific assets or liabilities as we consider advisable, to manage exposure to interest rate movements or other identified risks, and/or to directly offset derivatives sold to our customers. For a detailed discussion of the use of and accounting policies regarding derivative instruments, see Note 7 of our 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 by the contractual terms. At September 30, 2018 , the fair value of our derivative liabilities was $76 million , for which we were required to pledge cash collateral of approximately $38 million in the normal course of business. If our credit rating were downgraded one notch by either Standard & Poor’s or Moody’s at September 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 September 30, 2018 and December 31, 2017 , and the related gain (loss) of derivative instruments for the three and nine months ended September 30, 2018 and 2017 is summarized as follows: September 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: Cash flow hedges: Interest rate swaps $ 713 $ — $ — $ 1,138 $ — $ — Fair value hedges: Interest rate swaps 500 — — — — — Total derivatives designated as hedging instruments 1,213 — — 1,138 — — Derivatives not designated as hedging instruments: Interest rate swaps and forwards 237 1 — 223 1 — Interest rate swaps for customers 1 5,345 18 73 4,550 28 33 Foreign exchange 324 4 3 913 9 7 Total derivatives not designated as hedging instruments 5,906 23 76 5,686 38 40 Total derivatives $ 7,119 $ 23 $ 76 $ 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 September 30, 2018 Nine Months Ended September 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 $ (1 ) $ (1 ) $ (8 ) $ (3 ) Derivatives not designated as hedging instruments: Interest rate swaps for customers $ 8 $ 12 Foreign exchange 6 13 Total derivatives $ (1 ) $ (1 ) $ 14 $ — $ (8 ) $ (3 ) $ 25 $ — Amount of derivative gain (loss) recognized/reclassified Three Months Ended September 30, 2017 Nine Months Ended September 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 $ — $ — $ — $ 3 Derivatives not designated as hedging instruments: Interest rate swaps and forward contracts $ — $ (1 ) Interest rate swaps for customers 4 8 Foreign exchange 4 12 Total derivatives $ — $ — $ 8 $ — $ — $ 3 $ 19 $ — Note: These schedules are not intended to present at any given time the Bank’s long/short position with respect to its derivative contracts. 1 Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). For the 12 months following September 30, 2018 , we estimate that $(6) million will be reclassified from AOCI into interest income The following schedule presents derivatives used in fair value hedge accounting relationships, as well as pre-tax gains/(losses) recorded on such derivatives and the related hedged items for the periods presented. Gain/(loss) recorded in income Three Months Ended September 30, 2018 Three Months Ended September 30, 2017 (In millions) Derivatives Hedged items Total income statement impact Derivatives Hedged items Total income statement impact Interest rate swaps 1 $ 1 $ (1 ) $ — $ — $ — $ — Gain/(loss) recorded in income Nine Months Ended September 30, 2018 Nine Months Ended September 30, 2017 (In millions) Derivatives Hedged items Total income statement impact Derivatives Hedged items Total income statement impact Interest rate swaps 1 $ 1 $ (1 ) $ — $ — $ — $ — 1 Consists of hedges of benchmark interest rate risk of fixed-rate long-term debt. Gains and losses were recorded in net interest income. The following schedule provides selected information regarding the long-term debt in the statement of financial position in which the hedged item is included. Carrying amount of the hedged assets/(liabilities) Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities) (In millions) 2018 2017 2018 2017 Long-term debt $ (499 ) $ — $ 1 $ — The fair value of derivative assets was reduced by a net credit valuation adjustment of $1 million and $4 million at September 30 , 2018 and 2017 , respectively. The adjustment for derivative liabilities was a decrease of $2 million and $1 million at September 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	9 Months Ended
	Sep. 30, 2018
Capitalization, Long-term Debt and Equity [Abstract]
Debt And Shareholders' Equity	LONG-TERM DEBT AND SHAREHOLDERS’ EQUITY Long-Term Debt Long-term debt is summarized as follows: (In millions) September 30, December 31, 2017 Subordinated notes $ 247 $ 247 Senior notes 632 135 Capital lease obligations — 1 Total $ 879 $ 383 The preceding carrying values represent the par value of the debt adjusted for any unamortized premium or discount or unamortized debt issuance costs as well as valuation adjustments for fair value swaps. During the third quarter of 2018, the Bank issued a $500 million senior note with an interest rate of 3.5% and a maturity date of August 27, 2021. The Bank intends to call, on the November 15, 2018 call date, $162 million of subordinated notes that mature on November 15, 2023. Common Stock On September 30, 2018, the Bank completed the merger of Zions Bancorporation, its former bank holding company, with, and into its subsidiary bank, formerly known as ZB, N.A. As a result of this merger, the Bank’s common stock now has a 0.001 par value, and is $192,169 at September 30, 2018. Repurchases of Bank Common Stock During the third quarter of 2018 , we continued our common stock buyback program and repurchased 3.5 million shares of common stock outstanding with a fair value of $185 million at an average price of $52.86 per share. During the first nine months of 2018, we repurchased 7.8 million common shares outstanding with a fair value of $420 million at an average price of $53.84 per share. During the first nine months of 2017 , we repurchased 4.7 million shares of common stock outstanding with a fair value of $205 million , at an average price of $43.72 per share. In October 2018, the Bank announced that the Board approved a plan to repurchase $250 million of common stock during the fourth quarter of 2018 and subsequently began the repurchases. Common Stock Warrants During the first nine months of 2018, 1.3 million shares of common stock were issued from the cashless exercise of 3.9 million common stock ZIONZ warrants. As of September 30, 2018, 1.9 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 September 30, 2018, 29.3 million common stock ZIONW warrants, with an exercise price of $35.03 , were outstanding. These warrants expire on May 22, 2020. Accumulated Other Comprehensive Income Accumulated other comprehensive income (loss) was $(361) million at September 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 Nine Months Ended September 30, 2018 Balance at December 31, 2017 $ (114 ) $ (2 ) $ (23 ) $ (139 ) OCI (loss) before reclassifications, net of tax (221 ) (3 ) — (224 ) Amounts reclassified from AOCI, net of tax — 2 — 2 OCI (loss) (221 ) (1 ) — (222 ) Balance at September 30, 2018 $ (335 ) $ (3 ) $ (23 ) $ (361 ) Income tax benefit included in OCI (loss) $ (73 ) $ — $ — $ (73 ) Nine Months Ended September 30, 2017 Balance at December 31, 2016 $ (93 ) $ 2 $ (31 ) $ (122 ) OCI before reclassifications, net of tax 65 2 — 67 Amounts reclassified from AOCI, net of tax — (2 ) — (2 ) OCI 65 — — 65 Balance at September 30, 2017 $ (28 ) $ 2 $ (31 ) $ (57 ) Income tax expense included in OCI $ 40 $ — $ — $ 40 Amounts reclassified from AOCI 1 Amounts reclassified from AOCI 1 Statement of income (SI) Balance sheet (BS) (In millions) Three Months Ended Nine Months Ended Details about AOCI components 2018 2017 2018 2017 Affected line item Net unrealized gains on derivative instruments $ (1 ) $ — $ (3 ) $ 3 SI Interest and fees on loans Income tax expense — — (1 ) 1 Amounts Reclassified from AOCI $ (1 ) $ — $ (2 ) $ 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	9 Months Ended
	Sep. 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) September 30, December 31, Net unfunded commitments to extend credit 1 $ 20,999 $ 19,583 Standby letters of credit: Financial 673 721 Performance 196 196 Commercial letters of credit 20 31 Total unfunded lending commitments $ 21,888 $ 20,531 1 Net of participations The Bank’s 2017 Annual Report on Form 10-K contains further information about these commitments and guarantees including their terms and collateral requirements. At September 30, 2018 , the Bank 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 September 30, 2018 , we had unfunded commitments for PEIs of approximately $31 million . These obligations have no stated maturity. PEIs related to these commitments that are prohibited by the Volcker Rule were $2 million at September 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 September 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 and discovery having been completed, with additional motion practice and expert witness phases 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 and discovery is underway. • a civil class action lawsuit, Evans v. CB&T , brought against us in the United States District Court for the Eastern District of California in May 2017. This case was filed on behalf of a class of up to 50 investors in IMG and seeks to hold us liable for losses of class members arising from their investments in IMG, alleging that we conspired with and knowingly assisted IMG and its principal in furtherance of an alleged Ponzi scheme. In December 2017, the District Court dismissed all claims against the Bank. In January 2018, the plaintiff filed an appeal with the Court of Appeals for the Ninth Circuit. The appellate briefing process has been completed with a ruling anticipated in 2019. • a Private Attorney General Act (“PAGA”) claim under California law, Lawson v. CB&T , brought against us in the Superior Court for the County of San Diego, California, in February 2016. In this case, the plaintiff alleges, on behalf of herself and other current or former employees of the Bank who worked in California on a non-exempt basis, violations by the Bank of California wage and hour laws. The case remains in the early stages of motion practice, to date mainly involving questions of venue and scope of employees covered by the PAGA claims. In March 2018, the Supreme Court of California granted review of an appeal from the intermediate appellate court decision requiring all aspects of the case to be heard in state court, rather than in arbitration. The appellate briefing process has been completed with a ruling anticipated in 2019. • 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 Bank which filed for bankruptcy protection in 2017. The case is in early phase, with initial motion practice and discovery 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 September 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	9 Months Ended
	Sep. 30, 2018
Defined Benefit Plan [Abstract]
Retirement Plans	RETIREMENT PLANS The following discloses the net periodic benefit cost (credit) and its components for the Bank’s pension and other retirement plans: (In millions) Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Interest cost $ 1 $ 2 $ 4 $ 5 Expected return on plan assets (3 ) (3 ) (9 ) (9 ) Partial settlement loss 1 1 2 2 Amortization of net actuarial loss — 1 1 4 Net periodic benefit cost (benefit) $ (1 ) $ 1 $ (2 ) $ 2 As disclosed in our 2017 Annual Report on Form 10-K, the Bank has frozen its participation and benefit accruals for the pension plan and its contributions for individual benefit payments in the postretirement benefit plan. In October 2018, the Bank has decided to terminate its pension plan subject to obtaining necessary regulatory approval. Completion of this termination is expected in early 2020. Plan participant benefits will not be disadvantaged because of this decision.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The effective income tax rate of 23.6% for the third quarter of 2018 was lower than the 2017 third quarter rate of 34.2% . The effective tax rates for the first nine months of 2018 and 2017 were 22.9% and 30.6% , 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, certain executive compensation and other 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 $170 million at September 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 the deferred gain on a prior period debt exchange. Net charge-offs exceeding the provision for loan losses and an increase in deferred loan fees offset some of the overall increase in DTA.

Net Earnings per Common Share (

Net Earnings per Common Share (Notes)	9 Months Ended
	Sep. 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 Nine Months Ended (In millions, except shares and per share amounts) 2018 2017 2018 2017 Basic: Net income $ 223 $ 160 $ 658 $ 469 Less common and preferred dividends 66 32 170 89 Undistributed earnings 157 128 488 380 Less undistributed earnings applicable to nonvested shares 1 1 4 4 Undistributed earnings applicable to common shares 156 127 484 376 Distributed earnings applicable to common shares 58 24 144 56 Total earnings applicable to common shares $ 214 $ 151 $ 628 $ 432 Weighted average common shares outstanding (in thousands) 192,973 200,332 195,079 201,493 Net earnings per common share $ 1.11 $ 0.75 $ 3.22 $ 2.14 Diluted: Total earnings applicable to common shares $ 214 $ 151 $ 628 $ 432 Weighted average common shares outstanding (in thousands) 192,973 200,332 195,079 201,493 Dilutive effect of common stock warrants (in thousands) 11,880 7,729 12,555 6,783 Dilutive effect of stock options (in thousands) 912 1,045 1,023 1,090 Weighted average diluted common shares outstanding (in thousands) 205,765 209,106 208,657 209,366 Net earnings per common share $ 1.04 $ 0.72 $ 3.01 $ 2.06 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 Nine Months Ended (In thousands) 2018 2017 2018 2017 Restricted stock and restricted stock units 1,490 1,779 1,651 1,997

Operating Segment Information

Operating Segment Information	9 Months Ended
	Sep. 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 September 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 90 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 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 Bank’s net interest income includes interest expense on borrowed funds. The condensed statement of income identifies the components of income and expense which affect the operating amounts presented in the Other segment. The accounting policies of the individual operating segments are the same as those of the Bank. Transactions between operating segments are primarily conducted at fair value, resulting in profits that are eliminated for reporting consolidated results of operations. The following schedule presents selected operating segment information for the three months ended September 30, 2018 and 2017 : (In millions) Zions Bank Amegy CB&T 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 177 $ 165 $ 133 $ 122 $ 138 $ 120 Provision for loan losses 2 (15 ) (16 ) 33 3 (4 ) Net interest income after provision for loan losses 175 180 149 89 135 124 Noninterest income 38 39 31 28 19 20 Noninterest expense 118 107 84 86 77 74 Income (loss) before income taxes $ 95 $ 112 $ 96 $ 31 $ 77 $ 70 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 12,607 $ 12,543 $ 11,328 $ 11,170 $ 9,985 $ 9,575 Total average deposits 15,845 15,773 11,185 10,862 11,335 11,021 (In millions) NBAZ NSB Vectra 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 59 $ 53 $ 38 $ 33 $ 35 $ 32 Provision for loan losses (1 ) (8 ) — (3 ) 1 — Net interest income after provision for loan losses 60 61 38 36 34 32 Noninterest income 10 10 10 11 6 7 Noninterest expense 39 38 35 35 26 25 Income (loss) before income taxes $ 31 $ 33 $ 13 $ 12 $ 14 $ 14 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 4,591 $ 4,267 $ 2,408 $ 2,347 $ 2,969 $ 2,683 Total average deposits 5,008 4,816 4,302 4,276 2,789 2,757 (In millions) TCBW Other Consolidated Bank 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 14 $ 12 $ (29 ) $ (15 ) $ 565 $ 522 Provision for loan losses — 3 — (1 ) (11 ) 5 Net interest income after provision for loan losses 14 9 (29 ) (14 ) 576 517 Noninterest income 1 1 21 23 136 139 Noninterest expense 6 5 35 43 420 413 Income (loss) before income taxes $ 9 $ 5 $ (43 ) $ (34 ) $ 292 $ 243 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 1,136 $ 939 $ 344 $ 308 $ 45,368 $ 43,832 Total average deposits 1,086 1,098 2,025 1,318 53,575 51,921 The following schedule presents selected operating segment information for the nine months ended September 30, 2018 and 2017 : (In millions) Zions Bank Amegy CB&T 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 516 $ 475 $ 385 $ 360 $ 399 $ 355 Provision for loan losses 3 18 (72 ) 41 7 (10 ) Net interest income after provision for loan losses 513 457 457 319 392 365 Noninterest income 111 112 95 87 59 56 Noninterest expense 350 327 254 259 231 225 Income (loss) before income taxes $ 274 $ 242 $ 298 $ 147 $ 220 $ 196 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 12,565 $ 12,505 $ 11,362 $ 10,890 $ 9,941 $ 9,453 Total average deposits 15,847 16,001 11,022 11,131 11,213 10,953 (In millions) NBAZ NSB Vectra 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 170 $ 152 $ 111 $ 96 $ 101 $ 94 Provision for loan losses 8 (7 ) — (8 ) 5 — Net interest income after provision for loan losses 162 159 111 104 96 94 Noninterest income 29 29 30 30 18 19 Noninterest expense 115 111 108 105 79 75 Income (loss) before income taxes $ 76 $ 77 $ 33 $ 29 $ 35 $ 38 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 4,591 $ 4,258 $ 2,369 $ 2,352 $ 2,882 $ 2,607 Total average deposits 4,912 4,747 4,280 4,240 2,762 2,758 (In millions) TCBW Other Consolidated Bank 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 38 $ 34 $ (66 ) $ (27 ) $ 1,654 $ 1,539 Provision for loan losses 2 2 1 (1 ) (46 ) 35 Net interest income after provision for loan losses 36 32 (67 ) (26 ) 1,700 1,504 Noninterest income 4 3 66 68 412 404 Noninterest expense 16 16 106 114 1,259 1,232 Income (loss) before income taxes $ 24 $ 19 $ (107 ) $ (72 ) $ 853 $ 676 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 1,113 $ 909 $ 336 $ 244 $ 45,159 $ 43,218 Total average deposits 1,069 1,098 1,722 1,227 52,827 52,155

Basis of Presentaion Organizati

Basis of Presentaion Organization and Presentation (Policies)	9 Months Ended
	Sep. 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, National Association and its majority-owned subsidiaries (collectively “Zions Bancorporation, N.A.,” “the Bank,” “we,” “our,” “us”) have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. References to GAAP, including standards promulgated by the Financial Accounting Standards Board, are made according to sections of the Accounting Standards Codification (“ASC”). Changes to the ASC are made with Accounting Standards Updates (“ASU”) that include consensus issues of the Emerging Issues Task Force. Operating results for the nine months ended September 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 Bank’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, N.A. is a commercial bank headquartered in Salt Lake City, Utah. The Bank provides 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.

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis	(In millions) September 30, 2018 Level 1 Level 2 Level 3 Total ASSETS Investment securities: Available-for-sale: 1 U.S. Treasury, agencies and corporations $ 25 $ 13,292 $ — $ 13,317 Municipal securities 1,284 1,284 Other debt securities 24 24 Total Available-for-sale 25 14,600 — 14,625 Trading account 119 57 176 Other noninterest-bearing investments: Bank-owned life insurance 516 516 Private equity investments 103 103 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 18 18 Foreign currency exchange contracts 4 4 Total Assets $ 256 $ 15,192 $ 121 $ 15,569 LIABILITIES Securities sold, not yet purchased $ 49 $ — $ — $ 49 Other liabilities: Deferred compensation plan obligations 108 108 Derivatives: Interest rate swaps for customers 73 73 Foreign currency exchange contracts 3 3 Total Liabilities $ 160 $ 73 $ — $ 233 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 Nine Months Ended September 30, 2018 September 30, 2017 September 30, 2018 September 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 $ 102 $ 18 $ 82 $ 19 $ 95 $ 18 $ 73 $ 20 Securities gains (losses), net (1 ) — 5 — — — 7 — Other noninterest income — — — — — — — (1 ) Purchases 2 — 6 — 8 — 18 — Redemptions and paydowns — — — — — — (5 ) — Balance at end of period $ 103 $ 18 $ 93 $ 19 $ 103 $ 18 $ 93 $ 19
Schedule Of Realized Gains (Losses) Using Level 3 Inputs	(In millions) Three Months Ended Nine 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 September 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 — 23 — 23 — 9 — 9 Other real estate owned — 1 — 1 — — — — Total $ — $ 24 $ — $ 24 $ — $ 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 Nine Months Ended 2018 2017 2018 2017 ASSETS Private equity investments $ — $ — $ — $ (1 ) Impaired loans (9 ) (1 ) (15 ) (8 ) Other real estate owned — — (1 ) — Total $ (9 ) $ (1 ) $ (16 ) $ (9 )
Fair Value, by Balance Sheet Grouping [Table Text Block]	September 30, 2018 December 31, 2017 (In millions) Carrying value Estimated fair value Level Carrying value Estimated fair value Level Financial assets: HTM investment securities $ 751 $ 734 2 $ 770 $ 762 2 Loans and leases (including loans held for sale), net of allowance 45,391 44,452 3 44,306 44,226 3 Financial liabilities: Time deposits 4,256 4,231 2 3,115 3,099 2 Other short-term borrowings 2,900 2,900 2 3,600 3,600 2 Long-term debt 879 885 2 383 402 2 September 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 $ 781 $ (221 ) $ 560 $ — $ — $ 560 Derivatives (included in other assets) 23 — 23 (13 ) (8 ) 2 Total assets $ 804 $ (221 ) $ 583 $ (13 ) $ (8 ) $ 562 Liabilities: Federal funds and other short-term borrowings $ 4,001 $ (221 ) $ 3,780 $ — $ — $ 3,780 Derivatives (included in other liabilities) 76 — 76 (13 ) — 63 Total Liabilities $ 4,077 $ (221 ) $ 3,856 $ (13 ) $ — $ 3,843 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 Liabili_2

Offsetting Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2018
Offsetting Assets and Liabilities [Abstract]
Fair Value, by Balance Sheet Grouping [Table Text Block]	September 30, 2018 December 31, 2017 (In millions) Carrying value Estimated fair value Level Carrying value Estimated fair value Level Financial assets: HTM investment securities $ 751 $ 734 2 $ 770 $ 762 2 Loans and leases (including loans held for sale), net of allowance 45,391 44,452 3 44,306 44,226 3 Financial liabilities: Time deposits 4,256 4,231 2 3,115 3,099 2 Other short-term borrowings 2,900 2,900 2 3,600 3,600 2 Long-term debt 879 885 2 383 402 2 September 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 $ 781 $ (221 ) $ 560 $ — $ — $ 560 Derivatives (included in other assets) 23 — 23 (13 ) (8 ) 2 Total assets $ 804 $ (221 ) $ 583 $ (13 ) $ (8 ) $ 562 Liabilities: Federal funds and other short-term borrowings $ 4,001 $ (221 ) $ 3,780 $ — $ — $ 3,780 Derivatives (included in other liabilities) 76 — 76 (13 ) — 63 Total Liabilities $ 4,077 $ (221 ) $ 3,856 $ (13 ) $ — $ 3,843 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)	9 Months Ended
	Sep. 30, 2018
Investments [Abstract]
Summary Of Investment Securities	September 30, 2018 (In millions) Amortized cost Gross unrealized gains Gross unrealized losses Estimated fair value Held-to-maturity Municipal securities $ 751 $ 4 $ 21 $ 734 Available-for-sale U.S. Treasury securities 25 — — 25 U.S. Government agencies and corporations: Agency securities 1,480 — 32 1,448 Agency guaranteed mortgage-backed securities 10,159 6 341 9,824 Small Business Administration loan-backed securities 2,069 1 50 2,020 Municipal securities 1,313 1 30 1,284 Other debt securities 25 — 1 24 Total available-for-sale 15,071 8 454 14,625 Total investment securities $ 15,822 $ 12 $ 475 $ 15,359 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	September 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 $ 201 $ 199 $ 1,572 $ 1,528 Due after one year through five years 356 349 4,874 4,733 Due after five years through ten years 139 135 4,650 4,509 Due after ten years 55 51 3,975 3,855 Total $ 751 $ 734 $ 15,071 $ 14,625
Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value	September 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 $ 227 $ 17 $ 343 $ 21 $ 570 Available-for-sale U.S. Treasury securities — 25 — — — 25 U.S. Government agencies and corporations: Agency securities 20 970 12 354 32 1,324 Agency guaranteed mortgage-backed securities 92 3,821 249 5,354 341 9,175 Small Business Administration loan-backed securities 25 1,414 25 559 50 1,973 Municipal securities 15 834 15 331 30 1,165 Other — — 1 14 1 14 Total available-for-sale 152 7,064 302 6,612 454 13,676 Total $ 156 $ 7,291 $ 319 $ 6,955 $ 475 $ 14,246 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 September 30, Nine Months Ended September 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 $ 5 $ 5 $ — $ 9 $ 10 $ 20 $ 7 Net gains (losses) 1 $ (1 ) $ 5 $ (1 ) $ 13
Tax and Nontaxable Interest Income by Investment Type [Table Text Block]	Three Months Ended September 30, (In millions) 2018 2017 Taxable Nontaxable Total Taxable Nontaxable Total Investment securities: Held-to-maturity $ 3 $ 4 $ 7 $ 2 $ 3 $ 5 Available-for-sale 73 6 79 72 6 78 Trading — — — 1 — 1 Total $ 76 $ 10 $ 86 $ 75 $ 9 $ 84 Nine Months Ended September 30, (In millions) 2018 2017 Taxable Nontaxable Total Taxable Nontaxable Total Investment securities: Held-to-maturity $ 8 $ 11 $ 19 $ 7 $ 10 $ 17 Available-for-sale 216 19 235 209 18 227 Trading 3 — 3 2 — 2 Total $ 227 $ 30 $ 257 $ 218 $ 28 $ 246

Loans And Allowance For Credi_2

Loans And Allowance For Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investment of accuring and nonaccruing troubled debt restructuring [Text Block]	Three Months Ended Nine Months Ended (In millions) Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial: Commercial and industrial $ — $ 1 $ 1 $ — $ 5 $ 5 Owner-occupied — — — — 1 1 Total commercial — 1 1 — 6 6 Commercial real estate: Term 2 — 2 2 — 2 Total commercial real estate 2 — 2 2 — 2 Total $ 2 $ 1 $ 3 $ 2 $ 6 $ 8 Three Months Ended Nine Months Ended (In millions) Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial: Commercial and industrial $ — $ 1 $ 1 $ — $ 1 $ 1 Owner-occupied — — — — 1 1 Total commercial — 1 1 — 2 2 Total $ — $ 1 $ 1 $ — $ 2 $ 2 Note: Total loans modified as TDRs during the 12 months previous to September 30, 2018 and 2017 were $99 million and $84 million , respectively.
allowance for loan losses by impairment [Table Text Block]	The ALLL and outstanding loan balances according to the Bank’s impairment method are summarized as follows: September 30, 2018 (In millions) Commercial Commercial real estate Consumer Total Allowance for loan losses: Individually evaluated for impairment $ 10 $ 1 $ 3 $ 14 Collectively evaluated for impairment 304 114 48 466 Purchased loans with evidence of credit deterioration — — — — Total $ 314 $ 115 $ 51 $ 480 Outstanding loan balances: Individually evaluated for impairment $ 201 $ 65 $ 74 $ 340 Collectively evaluated for impairment 23,338 10,982 11,150 45,470 Purchased loans with evidence of credit deterioration — — — — Total $ 23,539 $ 11,047 $ 11,224 $ 45,810 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) September 30, December 31, Loans held for sale $ 61 $ 44 Commercial: Commercial and industrial $ 14,096 $ 14,003 Leasing 332 364 Owner-occupied 7,548 7,288 Municipal 1,563 1,271 Total commercial 23,539 22,926 Commercial real estate: Construction and land development 2,295 2,021 Term 8,752 9,103 Total commercial real estate 11,047 11,124 Consumer: Home equity credit line 2,884 2,777 1-4 family residential 7,039 6,662 Construction and other consumer real estate 644 597 Bankcard and other revolving plans 483 509 Other 174 185 Total consumer 11,224 10,730 Total loans 1 $ 45,810 $ 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 September 30, 2018 (In millions) Commercial Commercial real estate Consumer Total Allowance for loan losses Balance at beginning of period $ 321 $ 122 $ 47 $ 490 Provision for loan losses (11 ) (5 ) 5 (11 ) Gross loan and lease charge-offs 8 5 4 17 Recoveries 12 3 3 18 Net loan and lease charge-offs (recoveries) (4 ) 2 1 (1 ) Balance at end of period $ 314 $ 115 $ 51 $ 480 Reserve for unfunded lending commitments Balance at beginning of period $ 43 $ 15 $ — $ 58 Provision for unfunded lending commitments (1 ) 1 — — Balance at end of period $ 42 $ 16 $ — $ 58 Total allowance for credit losses at end of period Allowance for loan losses $ 314 $ 115 $ 51 $ 480 Reserve for unfunded lending commitments 42 16 — 58 Total allowance for credit losses $ 356 $ 131 $ 51 $ 538 Nine Months Ended September 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 (69 ) 9 14 (46 ) Gross loan and lease charge-offs 38 5 13 56 Recoveries 50 8 6 64 Net loan and lease charge-offs (recoveries) (12 ) (3 ) 7 (8 ) Balance at end of period $ 314 $ 115 $ 51 $ 480 Reserve for unfunded lending commitments Balance at beginning of period $ 48 $ 10 $ — $ 58 Provision for unfunded lending commitments (6 ) 6 — — Balance at end of period $ 42 $ 16 $ — $ 58 Total allowance for credit losses at end of period Allowance for loan losses $ 314 $ 115 $ 51 $ 480 Reserve for unfunded lending commitments 42 16 — 58 Total allowance for credit losses $ 356 $ 131 $ 51 $ 538 Three Months Ended September 30, 2017 (In millions) Commercial Commercial real estate Consumer Total Allowance for loan losses Balance at beginning of period $ 393 $ 116 $ 35 $ 544 Provision for loan losses (4 ) (7 ) 16 5 Gross loan and lease charge-offs 16 4 5 25 Recoveries 12 2 3 17 Net loan and lease charge-offs (recoveries) 4 2 2 8 Balance at end of period $ 385 $ 107 $ 49 $ 541 Reserve for unfunded lending commitments Balance at beginning of period $ 53 $ 10 $ — $ 63 Provision for unfunded lending commitments (4 ) — — (4 ) Balance at end of period $ 49 $ 10 $ — $ 59 Total allowance for credit losses at end of period Allowance for loan losses $ 385 $ 107 $ 49 $ 541 Reserve for unfunded lending commitments 49 10 — 59 Total allowance for credit losses $ 434 $ 117 $ 49 $ 600 Nine Months Ended September 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 27 (15 ) 23 35 Gross loan and lease charge-offs 98 6 13 117 Recoveries 36 12 8 56 Net loan and lease charge-offs (recoveries) 62 (6 ) 5 61 Balance at end of period $ 385 $ 107 $ 49 $ 541 Reserve for unfunded lending commitments Balance at beginning of period $ 54 $ 11 $ — $ 65 Provision for unfunded lending commitments (5 ) (1 ) — (6 ) Balance at end of period $ 49 $ 10 $ — $ 59 Total allowance for credit losses at end of period Allowance for loan losses $ 385 $ 107 $ 49 $ 541 Reserve for unfunded lending commitments 49 10 — 59 Total allowance for credit losses $ 434 $ 117 $ 49 $ 600
Summary Of Nonaccrual Loans	Nonaccrual loans are summarized as follows: (In millions) September 30, December 31, Loans held for sale $ — $ 12 Commercial: Commercial and industrial $ 112 $ 195 Leasing 2 8 Owner-occupied 66 90 Municipal 1 1 Total commercial 181 294 Commercial real estate: Construction and land development — 4 Term 46 36 Total commercial real estate 46 40 Consumer: Home equity credit line 13 13 1-4 family residential 47 55 Construction and other consumer real estate — — Bankcard and other revolving plans 1 — Other — — Total consumer loans 61 68 Total $ 288 $ 402
Summary Of Past Due Loans (Accruing And Nonaccruing)	Past due loans (accruing and nonaccruing) are summarized as follows: September 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 $ 61 $ — $ — $ — $ 61 $ — $ — Commercial: Commercial and industrial $ 14,006 $ 40 $ 50 $ 90 $ 14,096 $ 6 $ 63 Leasing 331 — 1 1 332 — 1 Owner-occupied 7,500 26 22 48 7,548 2 41 Municipal 1,563 — — — 1,563 — 1 Total commercial 23,400 66 73 139 23,539 8 106 Commercial real estate: Construction and land development 2,295 — — — 2,295 — — Term 8,728 16 8 24 8,752 3 32 Total commercial real estate 11,023 16 8 24 11,047 3 32 Consumer: Home equity credit line 2,872 5 7 12 2,884 — 4 1-4 family residential 7,008 15 16 31 7,039 — 23 Construction and other consumer real estate 634 10 — 10 644 — — Bankcard and other revolving plans 478 3 2 5 483 1 — Other 173 1 — 1 174 — — Total consumer loans 11,165 34 25 59 11,224 1 27 Total $ 45,588 $ 116 $ 106 $ 222 $ 45,810 $ 12 $ 165 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	September 30, 2018 (In millions) Pass Special Mention Sub- standard Doubtful Total loans Total allowance Commercial: Commercial and industrial $ 13,416 $ 311 $ 369 $ — $ 14,096 Leasing 318 10 4 — 332 Owner-occupied 7,253 84 211 — 7,548 Municipal 1,536 4 23 — 1,563 Total commercial 22,523 409 607 — 23,539 $ 314 Commercial real estate: Construction and land development 2,284 11 — — 2,295 Term 8,631 18 103 — 8,752 Total commercial real estate 10,915 29 103 — 11,047 115 Consumer: Home equity credit line 2,866 — 18 — 2,884 1-4 family residential 6,988 — 51 — 7,039 Construction and other consumer real estate 642 — 2 — 644 Bankcard and other revolving plans 480 — 3 — 483 Other 174 — — — 174 Total consumer loans 11,150 — 74 — 11,224 51 Total $ 44,588 $ 438 $ 784 $ — $ 45,810 $ 480 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	September 30, 2018 (In millions) Unpaid principal balance Recorded investment Total recorded investment Related allowance with no allowance with allowance Commercial: Commercial and industrial $ 170 $ 72 $ 47 $ 119 $ 8 Owner-occupied 66 39 21 60 2 Municipal 1 1 — 1 — Total commercial 237 112 68 180 10 Commercial real estate: Construction and land development 1 — 1 1 — Term 59 44 5 49 — Total commercial real estate 60 44 6 50 — Consumer: Home equity credit line 16 12 2 14 3 1-4 family residential 70 33 26 59 — Construction and other consumer real estate 2 1 — 1 — Other — — — — — Total consumer loans 88 46 28 74 3 Total $ 385 $ 202 $ 102 $ 304 $ 13 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 Nine Months Ended (In millions) Average recorded investment Interest income recognized Average recorded investment Interest income recognized Commercial: Commercial and industrial $ 124 $ — $ 108 $ — Owner-occupied 51 — 46 8 Municipal 1 — 1 — Total commercial 176 — 155 8 Commercial real estate: Construction and land development 1 — 1 — Term 49 — 50 1 Total commercial real estate 50 — 51 1 Consumer: Home equity credit line 14 — 13 — 1-4 family residential 58 — 53 — Construction and other consumer real estate 1 — 1 — Other — — — — Total consumer loans 73 — 67 — Total $ 299 $ — $ 273 $ 9 Three Months Ended Nine Months Ended (In millions) Average recorded investment Interest income recognized Average recorded investment Interest income recognized Commercial: Commercial and industrial $ 356 $ 1 $ 311 $ 5 Owner-occupied 104 2 101 5 Municipal 1 — 1 — Total commercial 461 3 413 10 Commercial real estate: Construction and land development 10 — 11 — Term 53 1 58 11 Total commercial real estate 63 1 69 11 Consumer: Home equity credit line 21 — 21 1 1-4 family residential 53 1 53 1 Construction and other consumer real estate 2 — 2 — Other 1 — 1 — Total consumer loans 77 1 77 2 Total $ 601 $ 5 $ 559 $ 23
Summary Of Selected Information On TDRs That Includes Recorded Investment On An Accruing And Nonaccruing Basis By Loan Class And Modification Type	September 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 $ — $ — $ 15 $ 7 $ 26 Owner-occupied 1 2 — — 1 16 20 Municipal — — — — — — — Total commercial 1 6 — — 16 23 46 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 8 — — 3 13 1-4 family residential 1 1 6 — 2 30 40 Construction and other consumer real estate — — — — — 1 1 Total consumer loans 1 3 14 — 2 34 54 Total accruing 6 11 14 1 18 64 114 Nonaccruing Commercial: Commercial and industrial — 6 1 1 12 38 58 Owner-occupied 1 2 — 1 1 5 10 Municipal — — — — — 1 1 Total commercial 1 8 1 2 13 44 69 Commercial real estate: Term 3 — — 2 4 1 10 Total commercial real estate 3 — — 2 4 1 10 Consumer: Home equity credit line — — 1 — — — 1 1-4 family residential — — 1 — 1 8 10 Total consumer loans — — 2 — 1 8 11 Total nonaccruing 4 8 3 4 18 53 90 Total $ 10 $ 19 $ 17 $ 5 $ 36 $ 117 $ 204 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 He_2

Derivative Instruments And Hedging Activities Derivative Instruments and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Schedule of Derivative Instruments	September 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: Cash flow hedges: Interest rate swaps $ 713 $ — $ — $ 1,138 $ — $ — Fair value hedges: Interest rate swaps 500 — — — — — Total derivatives designated as hedging instruments 1,213 — — 1,138 — — Derivatives not designated as hedging instruments: Interest rate swaps and forwards 237 1 — 223 1 — Interest rate swaps for customers 1 5,345 18 73 4,550 28 33 Foreign exchange 324 4 3 913 9 7 Total derivatives not designated as hedging instruments 5,906 23 76 5,686 38 40 Total derivatives $ 7,119 $ 23 $ 76 $ 6,824 $ 38 $ 40 1 Notional amounts include both the customer swaps and the offsetting derivative contracts.
Schedule Of Gain (Loss) Of Derivative Instruments	Gain/(loss) recorded in income Three Months Ended September 30, 2018 Three Months Ended September 30, 2017 (In millions) Derivatives Hedged items Total income statement impact Derivatives Hedged items Total income statement impact Interest rate swaps 1 $ 1 $ (1 ) $ — $ — $ — $ — Gain/(loss) recorded in income Nine Months Ended September 30, 2018 Nine Months Ended September 30, 2017 (In millions) Derivatives Hedged items Total income statement impact Derivatives Hedged items Total income statement impact Interest rate swaps 1 $ 1 $ (1 ) $ — $ — $ — $ — 1 Consists of hedges of benchmark interest rate risk of fixed-rate long-term debt. Gains and losses were recorded in net interest income. Amount of derivative gain (loss) recognized/reclassified Three Months Ended September 30, 2018 Nine Months Ended September 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 $ (1 ) $ (1 ) $ (8 ) $ (3 ) Derivatives not designated as hedging instruments: Interest rate swaps for customers $ 8 $ 12 Foreign exchange 6 13 Total derivatives $ (1 ) $ (1 ) $ 14 $ — $ (8 ) $ (3 ) $ 25 $ — Amount of derivative gain (loss) recognized/reclassified Three Months Ended September 30, 2017 Nine Months Ended September 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 $ — $ — $ — $ 3 Derivatives not designated as hedging instruments: Interest rate swaps and forward contracts $ — $ (1 ) Interest rate swaps for customers 4 8 Foreign exchange 4 12 Total derivatives $ — $ — $ 8 $ — $ — $ 3 $ 19 $ — Note: These schedules are not intended to present at any given time the Bank’s long/short position with respect to its derivative contracts. 1 Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). For the 12 months following September 30, 2018 , we estimate that $(6) million will be reclassified from AOCI into interest income

Derivative Instruments And He_3

Derivative Instruments And Hedging Activities Long-term debt derivative (Tables)	9 Months Ended
	Sep. 30, 2018
Derivatives, Fair Value [Line Items]
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	Carrying amount of the hedged assets/(liabilities) Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities) (In millions) 2018 2017 2018 2017 Long-term debt $ (499 ) $ — $ 1 $ —

Debt And Shareholders' Equity (

Debt And Shareholders' Equity (Tables)	9 Months Ended
	Sep. 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) September 30, December 31, 2017 Subordinated notes $ 247 $ 247 Senior notes 632 135 Capital lease obligations — 1 Total $ 879 $ 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 Nine Months Ended Details about AOCI components 2018 2017 2018 2017 Affected line item Net unrealized gains on derivative instruments $ (1 ) $ — $ (3 ) $ 3 SI Interest and fees on loans Income tax expense — — (1 ) 1 Amounts Reclassified from AOCI $ (1 ) $ — $ (2 ) $ 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 Nine Months Ended September 30, 2018 Balance at December 31, 2017 $ (114 ) $ (2 ) $ (23 ) $ (139 ) OCI (loss) before reclassifications, net of tax (221 ) (3 ) — (224 ) Amounts reclassified from AOCI, net of tax — 2 — 2 OCI (loss) (221 ) (1 ) — (222 ) Balance at September 30, 2018 $ (335 ) $ (3 ) $ (23 ) $ (361 ) Income tax benefit included in OCI (loss) $ (73 ) $ — $ — $ (73 ) Nine Months Ended September 30, 2017 Balance at December 31, 2016 $ (93 ) $ 2 $ (31 ) $ (122 ) OCI before reclassifications, net of tax 65 2 — 67 Amounts reclassified from AOCI, net of tax — (2 ) — (2 ) OCI 65 — — 65 Balance at September 30, 2017 $ (28 ) $ 2 $ (31 ) $ (57 ) Income tax expense included in OCI $ 40 $ — $ — $ 40

Commitments, Guarantees, And _2

Commitments, Guarantees, And Contingent Liabilities (Tables)	9 Months Ended
	Sep. 30, 2018
Guarantees, Commitments And Contingencies [Abstract]
Schedule Of Guarantees Issued	(In millions) September 30, December 31, Net unfunded commitments to extend credit 1 $ 20,999 $ 19,583 Standby letters of credit: Financial 673 721 Performance 196 196 Commercial letters of credit 20 31 Total unfunded lending commitments $ 21,888 $ 20,531 1 Net of participations

Revenue Recognition Revenue Rec

Revenue Recognition Revenue Recognition (Tables)	9 Months Ended
	Sep. 30, 2018
Revenue Recognition and Deferred Revenue [Abstract]
Revenue Recognition, Services, Commissions [Policy Text Block]	Three Months Ended Nine Months Ended (In millions) 2018 2017 2018 2017 Card Fee Income $ 36 $ 34 $ 103 $ 101 ATM Fees 2 2 7 7 Other service charges 4 4 11 11 Other Commissions and fees 5 4 15 11 Ending balance $ 47 $ 44 $ 136 $ 130
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 $ 14 $ 16 $ 11 $ 9 $ 7 $ 7 Other service charges, commissions, and fees 19 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 19 15 15 Other noninterest income (Non-ASC 606 customer related) — — 9 9 4 4 Total customer-related fees 38 39 31 28 19 19 Other noninterest income (non-customer related) — — — — — 1 Total non-interest income 38 39 31 28 19 20 Other real estate owned gain from sale — — — — — 1 Net interest income 177 165 133 122 138 120 Total income less interest expense $ 215 $ 204 $ 164 $ 150 $ 157 $ 141 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 4 3 3 2 3 Wealth management and trust income — — 1 1 — — Capital markets and foreign exchange — — — — — — Total noninterest income from contracts with customers (ASC 606) 6 7 8 8 4 5 Other noninterest income (Non-ASC 606 customer related) 3 2 2 2 2 2 Total customer-related fees 9 9 10 10 6 7 Other noninterest income (non-customer related) 1 1 — 1 — — Total non-interest income 10 10 10 11 6 7 Other real estate owned gain from sale — — — — — — Net interest income 59 53 38 33 35 32 Total income less interest expense $ 69 $ 63 $ 48 $ 44 $ 41 $ 39 TCBW Other Consolidated Bank (In millions) 2018 2017 2018 2017 2018 2017 Service charges and fees on deposit accounts $ — $ — $ 1 $ 1 $ 42 $ 42 Other service charges, commissions, and fees 1 1 4 — 47 44 Wealth management and trust income — — 3 3 12 11 Capital markets and foreign exchange — — 2 2 3 3 Total noninterest income from contracts with customers (ASC 606) 1 1 10 6 104 100 Other noninterest income (Non-ASC 606 customer related) — — 1 3 21 22 Total customer-related fees 1 1 11 9 125 122 Other noninterest income (non-customer related) — — 10 14 11 17 Total non-interest income 1 1 21 23 136 139 Other real estate owned gain from sale — — — — — 1 Net interest income 14 12 (29 ) (15 ) 565 522 Total income less interest expense $ 15 $ 13 $ (8 ) $ 8 $ 701 $ 662 The following schedule sets forth the noninterest income and net revenue by operating segments for the nine months ended September 30, 2018 and 2017 : Zions Bank Amegy CB&T (In millions) 2018 2017 2018 2017 2018 2017 Service charges and fees on deposit accounts $ 43 $ 47 $ 33 $ 31 $ 21 $ 21 Other service charges, commissions, and fees 54 53 28 28 18 18 Wealth management and trust income 11 11 8 6 3 2 Capital markets and foreign exchange 4 3 (4 ) (4 ) 3 3 Total noninterest income from contracts with customers (ASC 606) 112 114 65 61 45 44 Other noninterest income (Non-ASC 606 customer related) (2 ) (1 ) 30 27 12 11 Total customer-related fees 110 113 95 88 57 55 Other noninterest income (non-customer related) 1 (1 ) — (1 ) 2 1 Total non-interest income 111 112 95 87 59 56 Other real estate owned gain from sale — — — — — 1 Net interest income 516 475 385 360 399 355 Total income less interest expense $ 627 $ 587 $ 480 $ 447 $ 458 $ 412 NBAZ NSB Vectra (In millions) 2018 2017 2018 2017 2018 2017 Service charges and fees on deposit accounts $ 9 $ 10 $ 10 $ 11 $ 7 $ 6 Other service charges, commissions, and fees 9 9 9 9 5 5 Wealth management and trust income 1 1 3 2 1 1 Capital markets and foreign exchange — — 1 — — 1 Total noninterest income from contracts with customers (ASC 606) 19 20 23 22 13 13 Other noninterest income (Non-ASC 606 customer related) 7 7 7 7 5 5 Total customer-related fees 26 27 30 29 18 18 Other noninterest income (non-customer related) 3 2 — 1 — 1 Total non-interest income 29 29 30 30 18 19 Other real estate owned gain from sale — — — — — — Net interest income 170 152 111 96 101 94 Total income less interest expense $ 199 $ 181 $ 141 $ 126 $ 119 $ 113 TCBW Other Consolidated Bank (In millions) 2018 2017 2018 2017 2018 2017 Service charges and fees on deposit accounts $ 1 $ 1 $ 1 $ — $ 125 $ 127 Other service charges, commissions, and fees 2 2 11 6 136 130 Wealth management and trust income — — 11 7 38 30 Capital markets and foreign exchange — — 4 4 8 7 Total noninterest income from contracts with customers (ASC 606) 3 3 27 17 307 294 Other noninterest income (Non-ASC 606 customer related) 1 — 5 7 65 63 Total customer-related fees 4 3 32 24 372 357 Other noninterest income (non-customer related) — — 34 44 40 47 Total non-interest income 4 3 66 68 412 404 Other real estate owned gain from sale — — 1 1 1 2 Net interest income 38 34 (66 ) (27 ) 1,654 1,539 Total income less interest expense $ 42 $ 37 $ 1 $ 42 $ 2,067 $ 1,945

Retirement Plans (Tables)

Retirement Plans (Tables)	9 Months Ended
	Sep. 30, 2018
Defined Benefit Plan [Abstract]
Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans	(In millions) Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Interest cost $ 1 $ 2 $ 4 $ 5 Expected return on plan assets (3 ) (3 ) (9 ) (9 ) Partial settlement loss 1 1 2 2 Amortization of net actuarial loss — 1 1 4 Net periodic benefit cost (benefit) $ (1 ) $ 1 $ (2 ) $ 2

Net Earnings per Common Share B

Net Earnings per Common Share Basic and diluted net earnings per common share (Tables)	9 Months Ended
	Sep. 30, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block]	Three Months Ended Nine Months Ended (In millions, except shares and per share amounts) 2018 2017 2018 2017 Basic: Net income $ 223 $ 160 $ 658 $ 469 Less common and preferred dividends 66 32 170 89 Undistributed earnings 157 128 488 380 Less undistributed earnings applicable to nonvested shares 1 1 4 4 Undistributed earnings applicable to common shares 156 127 484 376 Distributed earnings applicable to common shares 58 24 144 56 Total earnings applicable to common shares $ 214 $ 151 $ 628 $ 432 Weighted average common shares outstanding (in thousands) 192,973 200,332 195,079 201,493 Net earnings per common share $ 1.11 $ 0.75 $ 3.22 $ 2.14 Diluted: Total earnings applicable to common shares $ 214 $ 151 $ 628 $ 432 Weighted average common shares outstanding (in thousands) 192,973 200,332 195,079 201,493 Dilutive effect of common stock warrants (in thousands) 11,880 7,729 12,555 6,783 Dilutive effect of stock options (in thousands) 912 1,045 1,023 1,090 Weighted average diluted common shares outstanding (in thousands) 205,765 209,106 208,657 209,366 Net earnings per common share $ 1.04 $ 0.72 $ 3.01 $ 2.06

Net Earnings per Common Share W

Net Earnings per Common Share Weighted average shares of stock awards that were anti-dilutive (Tables)	9 Months Ended
	Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Schedule of Weighted Average Number of Shares [Table Text Block]	Three Months Ended Nine Months Ended (In thousands) 2018 2017 2018 2017 Restricted stock and restricted stock units 1,490 1,779 1,651 1,997

Operating Segment Information (

Operating Segment Information (Tables)	9 Months Ended
	Sep. 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 September 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 90 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 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 Bank’s net interest income includes interest expense on borrowed funds. The condensed statement of income identifies the components of income and expense which affect the operating amounts presented in the Other segment. The accounting policies of the individual operating segments are the same as those of the Bank. Transactions between operating segments are primarily conducted at fair value, resulting in profits that are eliminated for reporting consolidated results of operations. The following schedule presents selected operating segment information for the three months ended September 30, 2018 and 2017 : (In millions) Zions Bank Amegy CB&T 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 177 $ 165 $ 133 $ 122 $ 138 $ 120 Provision for loan losses 2 (15 ) (16 ) 33 3 (4 ) Net interest income after provision for loan losses 175 180 149 89 135 124 Noninterest income 38 39 31 28 19 20 Noninterest expense 118 107 84 86 77 74 Income (loss) before income taxes $ 95 $ 112 $ 96 $ 31 $ 77 $ 70 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 12,607 $ 12,543 $ 11,328 $ 11,170 $ 9,985 $ 9,575 Total average deposits 15,845 15,773 11,185 10,862 11,335 11,021 (In millions) NBAZ NSB Vectra 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 59 $ 53 $ 38 $ 33 $ 35 $ 32 Provision for loan losses (1 ) (8 ) — (3 ) 1 — Net interest income after provision for loan losses 60 61 38 36 34 32 Noninterest income 10 10 10 11 6 7 Noninterest expense 39 38 35 35 26 25 Income (loss) before income taxes $ 31 $ 33 $ 13 $ 12 $ 14 $ 14 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 4,591 $ 4,267 $ 2,408 $ 2,347 $ 2,969 $ 2,683 Total average deposits 5,008 4,816 4,302 4,276 2,789 2,757 (In millions) TCBW Other Consolidated Bank 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 14 $ 12 $ (29 ) $ (15 ) $ 565 $ 522 Provision for loan losses — 3 — (1 ) (11 ) 5 Net interest income after provision for loan losses 14 9 (29 ) (14 ) 576 517 Noninterest income 1 1 21 23 136 139 Noninterest expense 6 5 35 43 420 413 Income (loss) before income taxes $ 9 $ 5 $ (43 ) $ (34 ) $ 292 $ 243 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 1,136 $ 939 $ 344 $ 308 $ 45,368 $ 43,832 Total average deposits 1,086 1,098 2,025 1,318 53,575 51,921 The following schedule presents selected operating segment information for the nine months ended September 30, 2018 and 2017 : (In millions) Zions Bank Amegy CB&T 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 516 $ 475 $ 385 $ 360 $ 399 $ 355 Provision for loan losses 3 18 (72 ) 41 7 (10 ) Net interest income after provision for loan losses 513 457 457 319 392 365 Noninterest income 111 112 95 87 59 56 Noninterest expense 350 327 254 259 231 225 Income (loss) before income taxes $ 274 $ 242 $ 298 $ 147 $ 220 $ 196 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 12,565 $ 12,505 $ 11,362 $ 10,890 $ 9,941 $ 9,453 Total average deposits 15,847 16,001 11,022 11,131 11,213 10,953 (In millions) NBAZ NSB Vectra 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 170 $ 152 $ 111 $ 96 $ 101 $ 94 Provision for loan losses 8 (7 ) — (8 ) 5 — Net interest income after provision for loan losses 162 159 111 104 96 94 Noninterest income 29 29 30 30 18 19 Noninterest expense 115 111 108 105 79 75 Income (loss) before income taxes $ 76 $ 77 $ 33 $ 29 $ 35 $ 38 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 4,591 $ 4,258 $ 2,369 $ 2,352 $ 2,882 $ 2,607 Total average deposits 4,912 4,747 4,280 4,240 2,762 2,758 (In millions) TCBW Other Consolidated Bank 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 38 $ 34 $ (66 ) $ (27 ) $ 1,654 $ 1,539 Provision for loan losses 2 2 1 (1 ) (46 ) 35 Net interest income after provision for loan losses 36 32 (67 ) (26 ) 1,700 1,504 Noninterest income 4 3 66 68 412 404 Noninterest expense 16 16 106 114 1,259 1,232 Income (loss) before income taxes $ 24 $ 19 $ (107 ) $ (72 ) $ 853 $ 676 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 1,113 $ 909 $ 336 $ 244 $ 45,159 $ 43,218 Total average deposits 1,069 1,098 1,722 1,227 52,827 52,155
Schedule of Segment Reporting Information, by Segment	(In millions) Zions Bank Amegy CB&T 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 177 $ 165 $ 133 $ 122 $ 138 $ 120 Provision for loan losses 2 (15 ) (16 ) 33 3 (4 ) Net interest income after provision for loan losses 175 180 149 89 135 124 Noninterest income 38 39 31 28 19 20 Noninterest expense 118 107 84 86 77 74 Income (loss) before income taxes $ 95 $ 112 $ 96 $ 31 $ 77 $ 70 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 12,607 $ 12,543 $ 11,328 $ 11,170 $ 9,985 $ 9,575 Total average deposits 15,845 15,773 11,185 10,862 11,335 11,021 (In millions) NBAZ NSB Vectra 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 59 $ 53 $ 38 $ 33 $ 35 $ 32 Provision for loan losses (1 ) (8 ) — (3 ) 1 — Net interest income after provision for loan losses 60 61 38 36 34 32 Noninterest income 10 10 10 11 6 7 Noninterest expense 39 38 35 35 26 25 Income (loss) before income taxes $ 31 $ 33 $ 13 $ 12 $ 14 $ 14 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 4,591 $ 4,267 $ 2,408 $ 2,347 $ 2,969 $ 2,683 Total average deposits 5,008 4,816 4,302 4,276 2,789 2,757 (In millions) TCBW Other Consolidated Bank 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 14 $ 12 $ (29 ) $ (15 ) $ 565 $ 522 Provision for loan losses — 3 — (1 ) (11 ) 5 Net interest income after provision for loan losses 14 9 (29 ) (14 ) 576 517 Noninterest income 1 1 21 23 136 139 Noninterest expense 6 5 35 43 420 413 Income (loss) before income taxes $ 9 $ 5 $ (43 ) $ (34 ) $ 292 $ 243 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 1,136 $ 939 $ 344 $ 308 $ 45,368 $ 43,832 Total average deposits 1,086 1,098 2,025 1,318 53,575 51,921 The following schedule presents selected operating segment information for the nine months ended September 30, 2018 and 2017 : (In millions) Zions Bank Amegy CB&T 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 516 $ 475 $ 385 $ 360 $ 399 $ 355 Provision for loan losses 3 18 (72 ) 41 7 (10 ) Net interest income after provision for loan losses 513 457 457 319 392 365 Noninterest income 111 112 95 87 59 56 Noninterest expense 350 327 254 259 231 225 Income (loss) before income taxes $ 274 $ 242 $ 298 $ 147 $ 220 $ 196 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 12,565 $ 12,505 $ 11,362 $ 10,890 $ 9,941 $ 9,453 Total average deposits 15,847 16,001 11,022 11,131 11,213 10,953 (In millions) NBAZ NSB Vectra 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 170 $ 152 $ 111 $ 96 $ 101 $ 94 Provision for loan losses 8 (7 ) — (8 ) 5 — Net interest income after provision for loan losses 162 159 111 104 96 94 Noninterest income 29 29 30 30 18 19 Noninterest expense 115 111 108 105 79 75 Income (loss) before income taxes $ 76 $ 77 $ 33 $ 29 $ 35 $ 38 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 4,591 $ 4,258 $ 2,369 $ 2,352 $ 2,882 $ 2,607 Total average deposits 4,912 4,747 4,280 4,240 2,762 2,758 (In millions) TCBW Other Consolidated Bank 2018 2017 2018 2017 2018 2017 SELECTED INCOME STATEMENT DATA Net interest income $ 38 $ 34 $ (66 ) $ (27 ) $ 1,654 $ 1,539 Provision for loan losses 2 2 1 (1 ) (46 ) 35 Net interest income after provision for loan losses 36 32 (67 ) (26 ) 1,700 1,504 Noninterest income 4 3 66 68 412 404 Noninterest expense 16 16 106 114 1,259 1,232 Income (loss) before income taxes $ 24 $ 19 $ (107 ) $ (72 ) $ 853 $ 676 SELECTED AVERAGE BALANCE SHEET DATA Total average loans $ 1,113 $ 909 $ 336 $ 244 $ 45,159 $ 43,218 Total average deposits 1,069 1,098 1,722 1,227 52,827 52,155

Basis of Presentaion (Details)

Basis of Presentaion (Details)	Sep. 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 ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Other Liabilities, Fair Value Disclosure	$ 108,000,000		$ 102,000,000
Other Assets, Fair Value Disclosure	108,000,000		102,000,000
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities	2,000,000	$ 1,000,000
Other noninterest-bearing investments valued under the cost method	11,000,000		10,000,000
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	311,000,000		338,000,000
Fair value of AFS securities	14,625,000,000		15,161,000,000
Net gains on sale of OREO properties		1,000,000
Principal amount of other real estate owned property sold	3,000,000	5,000,000
Equity Method Investments, Fair Value Disclosure	34,000,000		36,000,000
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		96,000,000
Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	14,600,000,000		15,065,000,000
Fair Value, Inputs, Level 3 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	0		0
Third Party Pricing Service [Member] | Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	0.95		0.92
Interest Rate Swaps For Customers [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities, Fair Value Disclosure	73,000,000		33,000,000
Other Assets, Fair Value Disclosure	18,000,000		28,000,000
Interest Rate Swaps For Customers [Member] | Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Other Assets, Fair Value Disclosure	18,000,000		28,000,000
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		102,000,000
Other Assets, Fair Value Disclosure	108,000,000
Available-for-sale Securities [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	1,284,000,000		1,334,000,000
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities	1,284,000,000		1,334,000,000
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Derivatives, Fair Value [Line Items]
Fair value of AFS securities
Other Real Estate Owned Properties [Member]
Derivatives, Fair Value [Line Items]
Net gains on sale of OREO properties	1,000,000	$ 2,000,000
Derivative [Member]
Derivatives, Fair Value [Line Items]
Other Assets, Fair Value Disclosure	1,000,000		1,000,000
Derivative [Member] | Fair Value, Inputs, Level 1 [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities, Fair Value Disclosure	3,000,000		7,000,000
Other Assets, Fair Value Disclosure	4,000,000		9,000,000
Derivative [Member] | Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities, Fair Value Disclosure	73,000,000		33,000,000
Other Assets, Fair Value Disclosure	$ 1,000,000		$ 1,000,000

Fair Value (Schedule Of Assets

Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains (Losses) on Sales of Other Real Estate		$ 1,000,000
Investments, Fair Value Disclosure	$ 14,625,000,000		$ 15,161,000,000
Debt Securities, Trading, and Equity Securities, FV-NI	176,000,000		148,000,000
Other Assets, Fair Value Disclosure	108,000,000		102,000,000
Assets, Fair Value Disclosure	15,569,000,000		16,069,000,000
Financial Instruments Sold, Not yet Purchased, at Fair Value	49,000,000		95,000,000
Other Liabilities, Fair Value Disclosure	108,000,000		102,000,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	233,000,000		237,000,000
Principal amount of other real estate owned property sold	3,000,000	5,000,000
Other noninterest-bearing investments valued under the cost method	11,000,000		10,000,000
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	311,000,000		338,000,000
Equity Method Investments, Fair Value Disclosure	34,000,000		36,000,000
Other Real Estate Owned Properties [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains (Losses) on Sales of Other Real Estate	1,000,000	$ 2,000,000
US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	13,317,000,000		13,731,000,000
Asset-backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	24,000,000		24,000,000
Interest Rate Swaps For Customers [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	18,000,000		28,000,000
Other Liabilities, Fair Value Disclosure	73,000,000		33,000,000
Available-for-sale Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	1,284,000,000		1,334,000,000
Derivative [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	1,000,000		1,000,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	256,000,000		207,000,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	160,000,000		204,000,000
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	15,192,000,000		15,749,000,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	73,000,000		33,000,000
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	121,000,000		113,000,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0		0
Mutual Funds And Stock Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure			72,000,000
Bank-owned life insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	516,000,000		507,000,000
Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	103,000,000		95,000,000
Assets, Fair Value Disclosure	0		1,000,000
Interest-Only-Strip [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	18,000,000		18,000,000
Foreign Exchange Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	4,000,000		9,000,000
Other Liabilities, Fair Value Disclosure	3,000,000		7,000,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	25,000,000		96,000,000
Debt Securities, Trading, and Equity Securities, FV-NI	119,000,000
Other Assets, Fair Value Disclosure			102,000,000
Financial Instruments Sold, Not yet Purchased, at Fair Value	49,000,000		95,000,000
Fair Value, Inputs, Level 1 [Member] | Warranty, Rights and Obligations, Fair Value Option [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	108,000,000
Other Liabilities, Fair Value Disclosure	108,000,000		102,000,000
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	25,000,000		25,000,000
Fair Value, Inputs, Level 1 [Member] | Derivative [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	4,000,000		9,000,000
Other Liabilities, Fair Value Disclosure	3,000,000		7,000,000
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			71,000,000
Fair Value, Inputs, Level 1 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure
Assets, Fair Value Disclosure	0		0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	14,600,000,000		15,065,000,000
Debt Securities, Trading, and Equity Securities, FV-NI	57,000,000		148,000,000
Financial Instruments Sold, Not yet Purchased, at Fair Value	0		0
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	13,292,000,000		13,706,000,000
Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	24,000,000		24,000,000
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps For Customers [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	18,000,000		28,000,000
Fair Value, Inputs, Level 2 [Member] | Available-for-sale Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	1,284,000,000		1,334,000,000
Fair Value, Inputs, Level 2 [Member] | Derivative [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	1,000,000		1,000,000
Other Liabilities, Fair Value Disclosure	73,000,000		33,000,000
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			1,000,000
Fair Value, Inputs, Level 2 [Member] | Bank-owned life insurance [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	516,000,000		507,000,000
Fair Value, Inputs, Level 2 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure
Assets, Fair Value Disclosure	0		0
Fair Value, Inputs, Level 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] | US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0		0
Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure
Fair Value, Inputs, Level 3 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Noninterest Bearing Investments Fair Value Disclosure	103,000,000		95,000,000
Assets, Fair Value Disclosure	0		1,000,000
Fair Value, Inputs, Level 3 [Member] | Interest-Only-Strip [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	18,000,000		18,000,000
Third Party Pricing Service [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	$ 0.95		$ 0.92

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	Sep. 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]
Investments, Fair Value Disclosure	$ 14,625	$ 15,161
Debt Securities, Trading, and Equity Securities, FV-NI	176	148
Other Assets, Fair Value Disclosure	108	102
Assets, Fair Value Disclosure	15,569	16,069
Financial Instruments Sold, Not yet Purchased, at Fair Value	49	95
Other Liabilities, Fair Value Disclosure	108	102
Financial and Nonfinancial Liabilities, Fair Value Disclosure	233	237
US Treasury 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	13,317	13,731
Interest Rate Swaps For Customers [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	28
Other Liabilities, Fair Value Disclosure	73	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	256	207
Financial and Nonfinancial Liabilities, Fair Value Disclosure	160	204
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	15,192	15,749
Financial and Nonfinancial Liabilities, Fair Value Disclosure	73	33
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	121	113
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Foreign Exchange Contract [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	4	9
Other Liabilities, Fair Value Disclosure	3	7
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	103	95
Assets, Fair Value Disclosure	0	1
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	516	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
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	1,284	1,334
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
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 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
Debt Securities, Trading, and Equity Securities, FV-NI	119
Other Assets, Fair Value Disclosure		102
Financial Instruments Sold, Not yet Purchased, at Fair Value	49	95
Fair Value, Inputs, Level 1 [Member] | US Treasury 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, 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
Assets, Fair Value Disclosure	0	0
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] | 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	4	9
Other Liabilities, Fair Value Disclosure	3	7
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	14,600	15,065
Debt Securities, Trading, and Equity Securities, FV-NI	57	148
Financial Instruments Sold, Not yet Purchased, at Fair Value	0	0
Fair Value, Inputs, Level 2 [Member] | US Treasury 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	13,292	13,706
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps For Customers [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	28
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
Assets, Fair Value Disclosure	0	0
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	516	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] | 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	1,284	1,334
Fair Value, Inputs, Level 2 [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
Other Liabilities, Fair Value Disclosure	73	33
Fair Value, Inputs, Level 2 [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 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] | US Treasury 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 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	103	95
Assets, Fair Value Disclosure	0	1
Fair Value, Inputs, Level 3 [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] | 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 (Schedule Of Asset_2

Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis Using Level 3 Inputs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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	102	$ 82	95	$ 73
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Equity Securities Gains (Losses), Net	(1)	5	0	7
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	2	6	8	18
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	0	0	5
Fair value of assets, Ending balance	103	93	103	93
Servicing Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets, Beginning balance	18	19	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	0	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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	$ 15,569		$ 15,569			$ 16,069
Other Assets, Fair Value Disclosure	108		108			102
Other Liabilities, Fair Value Disclosure	108		108			102
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	103	$ 93	103	$ 93	$ 102	95	$ 82	$ 73
Fair Value, Assets Measured On Recurring Basis, And Gain (Loss) Included In Equity Securities Gains (Losses), Net	(1)	5	0	7
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	2	6	8	18
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	$ 19	$ 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
Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	23		23			9
Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			1
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
Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	1		1			0
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	24		24			10
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure						102
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 1 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	23		23			9
Fair Value, Inputs, Level 2 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	1		1			0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	24		24			9
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 3 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			1
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0			0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	$ 0		$ 0			$ 1

Fair Value (Schedule Of Asset_3

Fair Value (Schedule Of Assets With Fair Value Changes On Nonrecurring Basis) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Principal amount of other real estate owned property sold			$ 3	$ 5
Gains (losses) from fair value changes	$ (9)	$ (1)	(16)	(9)
Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains (losses) from fair value changes	(9)	(1)	(15)	(8)
Private Equity Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
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]
Gains (losses) from fair value changes	$ 0	$ 0	$ (1)	$ 0

Fair Value (Schedule Of Carryin

Fair Value (Schedule Of Carrying Values And Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Held-to-maturity, fair value	$ 734
Long-term Debt	879	$ 383
Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Held-to-maturity	751	770
Time deposits	4,256	3,115
Other Short-term Borrowings	2,900	3,600
Long-term Debt	879	383
Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases (including loans held for sale), net of allowance	45,391	44,306
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Held-to-maturity, fair value	734	762
Time deposits	4,231	3,099
Other Short-term Borrowings	2,900	3,600
Long-term Debt	885	402
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases (including loans held for sale), net of allowance	$ 44,452	$ 44,226

Offsetting Assets and Liabili_3

Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 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	$ 560	$ 514
Gross amounts recognized	781	809
Gross amounts offset in the balance sheet	(221)	(295)
Net amounts presented in the balance sheet	560	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	2	28
Gross amounts recognized	23	38
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	23	38
Gross amounts not offset in the balance sheet	(13)	(9)
Cash Collateral Received/Pledged	(8)	(1)
Assets, Total [Member] | Assets [Member]
Offsetting Assets [Line Items]
Net amount	562	542
Gross amounts recognized	804	847
Gross amounts offset in the balance sheet	(221)	(295)
Net amounts presented in the balance sheet	583	552
Gross amounts not offset in the balance sheet	(13)	(9)
Cash Collateral Received/Pledged	(8)	(1)
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member] | Other Liabilities [Member]
Offsetting Assets [Line Items]
Net amount	3,780	4,976
Gross amounts recognized	4,001	5,271
Gross amounts offset in the balance sheet	(221)	(295)
Net amounts presented in the balance sheet	3,780	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	63	25
Gross amounts recognized	76	40
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	76	40
Gross amounts not offset in the balance sheet	(13)	(9)
Cash Collateral Received/Pledged	0	(6)
Liabilities, Total [Member] | Other Liabilities [Member]
Offsetting Assets [Line Items]
Net amount	3,843	5,001
Gross amounts recognized	4,077	5,311
Gross amounts offset in the balance sheet	(221)	(295)
Net amounts presented in the balance sheet	3,856	5,016
Gross amounts not offset in the balance sheet	(13)	(9)
Cash Collateral Received/Pledged	$ 0	$ (6)

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) $ in Millions	Sep. 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	676	667
Number of AFS investment securities in an unrealized loss position | Securities	3,018	2,262
Carrying value of pledged securities	$ 2,100
Private Equity Investments	148
Commitments for Private Equity and Other Noninterest-bearing Investments	31
Commitments for Private Equity or Other Non-Interest Bearing Investments Prohibited by the Volcker Rule	$ 2

Investment Securities (Summary

Investment Securities (Summary Of Investment Securities) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Investment [Line Items]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost	$ 201
Held-to-maturity, fair value	734
Debt Securities, Available-for-sale, Amortized Cost	15,071	$ 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
Debt Securities, Available-for-sale	14,625	15,089
Available-for-sale Securities, Gross Unrealized Gain	8	29
Available-for-sale, Amortized cost	15,071	15,313
Available-for-sale, Gross unrealized losses, Recognized in OCI	454	181
Available-for-sale securities, Estimated fair value	14,625	15,161
amortized cost of investment securities	15,822	16,083
Gross Unrealized Gains of Investment Securities Recognized in OCI	12	34
Gross Unrealized Losses of Investment Securities Recognized in OCI	475	194
Estimated Fair Value of Investment Securities	15,359	15,923
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	199
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	1,572
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	1,528
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost	356
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	349
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	4,874
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	4,733
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost	139
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	135
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	4,650
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	4,509
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	55
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	51
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	3,975
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	3,855
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost	751
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
Available-for-sale, Other debt securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	25	25
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	0	0
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	1	1
Debt Securities, Available-for-sale	24	24
Small Business Administration Loan Backed Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,069	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	50	15
Debt Securities, Available-for-sale	2,020	2,222
Agency Guaranteed Mortgage Backed Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	10,159	9,798
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	6	9
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	341	141
Debt Securities, Available-for-sale	9,824	9,666
Agency Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,480	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	32	13
Debt Securities, Available-for-sale	1,448	1,818
US Treasury Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	25	25
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	0	0
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	0	0
Debt Securities, Available-for-sale	25	25
US States and Political Subdivisions Debt Securities [Member]
Investment [Line Items]
Held-to-maturity, fair value	734	762
Held-to-maturity, Amortized cost	751	770
Debt Securities, Available-for-sale, Amortized Cost	1,313	1,336
Available-For-Sale Debt Securities, Gross Unrealized Gains, Recognized In O C I	1	9
Available-For-Sale Debt Securities, Gross Unrealized Losses, Recognized In O C I	30	11
Debt Securities, Available-for-sale	1,284	1,334
Held-to-maturity Securities, Unrecognized Holding Gain (Deprecated 2018-01-31)	4	5
Held-to-maturity Securities, Unrecognized Holding Loss (Deprecated 2018-01-31)	$ 21	$ 13

Investment Securities (Contract

Investment Securities (Contractual Maturities Debt Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost	$ 201
Held-to-maturity, Due in one year or less, Estimated fair value	199
Held-to-maturity, Due after one year through five years, Amortized cost	356
Held-to-maturity, Due after one year through five years, Estimated fair value	349
Held-to-maturity, Due after five years through ten years, Amortized cost	139
Held-to-maturity, Due after five years through ten years, Estimated fair value	135
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	55
Held-to-maturity, Due after ten years, Estimated fair value	51
Held-to-maturity, Amortized cost	751
Held-to-maturity, fair value	734
Available-for-sale, Due in one year or less, Amortized cost	1,572
Available-for-sale, Due in one year or less, Estimated fair value	1,528
Available-for-sale, Due after one year through five years, Amortized cost	4,874
Available-for-sale, Due after one year through five years, Estimated fair value	4,733
Available-for-sale, Due after five years through ten years, Amortized cost	4,650
Available-for-sale, Due after five years through ten years, Estimated fair value	4,509
Available-for-sale, Due after ten years, Amortized cost	3,975
Available-for-sale, Due after ten years, Estimated fair value	3,855
Available-for-sale, Amortized cost	15,071	$ 15,241
Available-for-sale, Estimated fair value	$ 14,625	$ 15,089

Investment Securities (Summar_2

Investment Securities (Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Available-for-sale, Unrealized losses, Other [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	14	14
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	1	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	14	14
US States and Political Subdivisions Debt Securities [Member]
Investment [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4	3
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	227	263
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	17	10
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	343	292
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	21	13
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	570	555
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	15	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	834	554
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	15	5
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	331	230
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	30	11
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,165	784
Small Business Administration Loan Backed Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	25	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,414	408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	25	12
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	559	649
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	50	15
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,973	1,057
Agency Guaranteed Mortgage Backed Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	92	29
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,821	3,609
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	249	112
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	5,354	4,721
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	341	141
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	9,175	8,330
Agency Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	20	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	970	808
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	12	7
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	354	808
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	32	13
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,324	$ 1,616
US Treasury Securities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	25
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 25

Investment Securities (Gains An

Investment Securities (Gains And Losses, Including OTTI, Recognized In Statement Of Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investments [Abstract]
Other noninterest-bearing investments, Nonmarketable equity securities, Gross gains	$ 4	$ 5	$ 9	$ 20
Other noninterest-bearing investments, Nonmarketable equity securities, Gross losses	5	0	10	7
Gain (Loss) on Investments	$ (1)	$ 5	$ (1)	$ 13

Investment Securities Taxable a

Investment Securities Taxable and Nontaxable Interest Income by Investment Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Noninterest Income	$ 86	$ 84	$ 257	$ 246
Taxable [Member]
Noninterest Income	76	75	227	218
Nontaxable [Member]
Noninterest Income	10	9	30	28
Held-to-maturity Securities [Member]
Noninterest Income	7	5	19	17
Held-to-maturity Securities [Member] | Taxable [Member]
Noninterest Income	3	2	8	7
Held-to-maturity Securities [Member] | Nontaxable [Member]
Noninterest Income	4	3	11	10
Available-for-sale Securities [Member]
Noninterest Income	79	78	235	227
Available-for-sale Securities [Member] | Taxable [Member]
Noninterest Income	73	72	216	209
Available-for-sale Securities [Member] | Nontaxable [Member]
Noninterest Income	6	6	19	18
Other Trading [Member]
Noninterest Income	0	1	3	2
Other Trading [Member] | Taxable [Member]
Noninterest Income	0	1	3	2
Other Trading [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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Noncredit related impairment losses [Line Items]
Investment Income, Interest	$ 86	$ 84	$ 257	$ 246
Available-for-sale Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	79	78	235	227
Held-to-maturity Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	7	5	19	17
Taxable [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	76	75	227	218
Taxable [Member] | Available-for-sale Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	73	72	216	209
Taxable [Member] | Held-to-maturity Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	3	2	8	7
Nontaxable [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	10	9	30	28
Nontaxable [Member] | Available-for-sale Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	6	6	19	18
Nontaxable [Member] | Held-to-maturity Securities [Member]
Noncredit related impairment losses [Line Items]
Investment Income, Interest	$ 4	$ 3	$ 11	$ 10

Loans And Allowance For Credi_3

Loans And Allowance For Credit Losses (Narrative) (Details) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)d	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Loans And Allowance For Credit Losses [Line Items]
Impaired loans, interest income, cash basis			$ 0	$ 0	$ 0
Impaired Financing Receivable, Average Recorded Investment		299	601	273	559
Impaired Financing Receivable, Interest Income, Accrual Method		0	5	9	23
Impaired Financing Receivable, Recorded Investment		304		304		$ 304			$ 461
Loans Receivable, Gross, Commercial and Industrial		14,096		14,096		14,096			14,003
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		14		14		14			31
Loans Modified As Troubled Debt Restructurings Loans						99
Unfunded Lending Commitments on Troubled Debt Restructuring		5		5		5			22
Loans and Leases Receivable, Gross		45,810		45,810		45,810			44,780
Financing Receivable, Recorded Investment, Current		45,588		45,588		45,588			44,497
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3	1	8	2		$ 84
Unearned income and fees, net of related costs		42		42		42			43
Land Development Loans		224		224		224			220
Loans at carrying value pledged as collateral for current and potential borrowings		23,400		23,400		23,400			25,600
Payments for Origination and Purchases of Loans Held-for-sale		184	176	584	640
Principal Balance of Loans Sold, Serviced Loans		2,200		2,200		2,200			2,200
Loans and Leases Receivable, Gain (Loss) on Sales, Net		3	1	10	9
Principle amount of loans held for sale sold		152	146	$ 464	696
Minimum number of days past due for nonaccrual status | d				90
Recorded investment in TDR loans modified with interest rates below market		90		$ 90		90			120
Provision for Loan and Lease Losses		(11)	5	(46)	35
Provision for Unfunded Lending Commitments (decrease)		0	(4)	0	(6)
Other Real Estate, Foreclosed Assets, and Repossessed Assets		2		2		2			1
Other Real Estate, In Process of Forecloseing Assets		10		10		10
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		116		116		116			140
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		106		106		106			143
Financing Receivable, Recorded Investment, Past Due		222		222		222			283
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		12		12		12			22
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	165		165		165			261
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		466		466		466			487
Financing Receivable, Allowance for Credit Losses		0		0		0			0
Loans and Leases Receivable, Allowance		480	541	480	541	480	544	$ 490	518	$ 567
Financing Receivable, Individually Evaluated for Impairment		340		340		340			459
Financing Receivable, Collectively Evaluated for Impairment		45,470		45,470		45,470			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		332		332		332			364
Commercial Lending Loans - Owner Occupied		7,548		7,548		7,548			7,288
Loans and Leases Receivable, Gross, Commercial, Governments		1,563		1,563		1,563			1,271
Land Development Loans, Loans Receivable Commercial Construction and Land Development		2,295		2,295		2,295			2,021
Commercial Real Estate Term Loans		8,752		8,752		8,752			9,103
Loans Receivable, Gross, Commercial, Real Estate		11,047		11,047		11,047			11,124
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,884		2,884		2,884			2,777
Loans and Leases Receivable, Gross, Consumer, Mortgage		7,039		7,039		7,039			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		644		644		644			597
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		483		483		483			509
Loans and Leases Receivable, Gross, Consumer, Other		174		174		174			185
Impaired Financing Receivable, Related Allowance		13		13		13			30
Impaired Financing Receivable, Unpaid Principal Balance		385		385		385			573
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses
Total reversal amount to allowance for loan and lease losses due to an increased cash flows from acquired loans		0
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		1	2	1	2
Impaired Financing Receivable, Interest Income, Accrual Method		0	0	0	0
Impaired Financing Receivable, Recorded Investment		1		1		1			2
Financing Receivable, Recorded Investment, Nonaccrual Status		0		0		0			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		58	53	53	53
Impaired Financing Receivable, Interest Income, Accrual Method		0	1	0	1
Impaired Financing Receivable, Recorded Investment		59		59		59			57
Financing Receivable, Recorded Investment, Nonaccrual Status		47		47		47			55
Impaired Financing Receivable, Related Allowance		0		0		0			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		119		119		119
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	5	1
Financing Receivable, Recorded Investment, Nonaccrual Status		112		112		112			195
Impaired Financing Receivable, Related Allowance		8		8		8			24
Impaired Financing Receivable, Unpaid Principal Balance		170		170		170			293
Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		14	21	13	21
Impaired Financing Receivable, Interest Income, Accrual Method		0	0	0	1
Impaired Financing Receivable, Recorded Investment		14		14		14			22
Financing Receivable, Recorded Investment, Nonaccrual Status		13		13		13			13
Impaired Financing Receivable, Related Allowance		3		3		3			0
Impaired Financing Receivable, Unpaid Principal Balance		16		16		16			25
Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		73	77	67	77
Impaired Financing Receivable, Interest Income, Accrual Method		0	1	0	2
Impaired Financing Receivable, Recorded Investment		74		74		74			82
Financing Receivable, Recorded Investment, Nonaccrual Status		61		61		61			68
Impaired Financing Receivable, Related Allowance		3		3		3			4
Impaired Financing Receivable, Unpaid Principal Balance		88		88		88			95
Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		14,096		14,096		14,096			14,003
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		10		10		10			26
Loans and Leases Receivable, Gross		23,539		$ 23,539		23,539			22,926
Subsequent payment default period, number of days | d				90
Provision for Loan and Lease Losses		(11)	(4)	$ (69)	27
Provision for Unfunded Lending Commitments (decrease)		(1)	(4)	(6)	(5)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		304		304		304			345
Financing Receivable, Allowance for Credit Losses		0		0		0			0
Loans and Leases Receivable, Allowance		314	385	314	385	314	393	321	371	420
Financing Receivable, Individually Evaluated for Impairment									314
Financing Receivable, Collectively Evaluated for Impairment									22,598
Leases Receivable, Gross, Commercial, Lease Financing		332		332		332			364
Commercial Lending Loans - Owner Occupied		7,548		7,548		7,548			7,288
Loans and Leases Receivable, Gross, Commercial, Governments		1,563		1,563		1,563			1,271
Loans and Leases Receivable, before Fees, Gross		23,539		23,539		23,539			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		11,224		$ 11,224		11,224			10,730
Subsequent payment default period, number of days | d				60
Provision for Loan and Lease Losses		5	16	$ 14	23
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		48		48		48			40
Financing Receivable, Allowance for Credit Losses		0		0		0			0
Loans and Leases Receivable, Allowance		51	49	51	49	51	35	47	44	31
Financing Receivable, Individually Evaluated for Impairment									76
Financing Receivable, Collectively Evaluated for Impairment									10,648
Loans and Leases Receivable, before Fees, Gross		11,224		11,224		11,224			10,730
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,884		2,884		2,884			2,777
Loans and Leases Receivable, Gross, Consumer, Mortgage		7,039		7,039		7,039			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		644		644		644			597
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		483		483		483			509
Loans and Leases Receivable, Gross, Consumer, Other		174		174		174			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		50	63	51	69
Impaired Financing Receivable, Interest Income, Accrual Method		0	1	1	11
Impaired Financing Receivable, Recorded Investment		50		50		50			54
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment									1
Loans and Leases Receivable, Gross		11,047		11,047		11,047			11,124
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Financing Receivable, Recorded Investment, Nonaccrual Status		46		46		46			40
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment									102
Loans and Leases Receivable, Allowance		115		115		115			103
Financing Receivable, Individually Evaluated for Impairment									69
Financing Receivable, Collectively Evaluated for Impairment									11,048
Impaired Financing Receivable, Related Allowance		0		0		0			0
Impaired Financing Receivable, Unpaid Principal Balance		60		60		60			64
Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		1	10	1	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		1		1		1
Provision for Loan and Lease Losses		(5)	(7)	9	(15)
Provision for Unfunded Lending Commitments (decrease)		1	0	6	(1)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		114		114		114
Financing Receivable, Allowance for Credit Losses		0		0		0			0
Loans and Leases Receivable, Allowance		115	107	115	107	115	$ 116	$ 122	103	$ 116
Land Development Loans, Loans Receivable Commercial Construction and Land Development									2,021
Commercial Real Estate Term Loans		8,752		8,752		8,752			9,103
Loans Receivable, Gross, Commercial, Real Estate		11,047		11,047		11,047			11,124
Construction and Land Development [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		0		0		0			4
Land Development Loans, Loans Receivable Commercial Construction and Land Development		2,295		2,295		2,295
Commercial Real Estate Construction [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		1		1		1
Impaired Financing Receivable, Related Allowance		0		0		0			0
Impaired Financing Receivable, Unpaid Principal Balance		1		1		1			8
Bankcard And Other Revolving Plans [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		1		1		1			0
Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		51	104	46	101
Impaired Financing Receivable, Interest Income, Accrual Method		0	2	8	5
Impaired Financing Receivable, Recorded Investment		60		60		60			102
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	1	1
Financing Receivable, Recorded Investment, Nonaccrual Status		66		66		66			90
Impaired Financing Receivable, Related Allowance		2		2		2			2
Impaired Financing Receivable, Unpaid Principal Balance		66		66		66			120
Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment		49	53	50	58
Impaired Financing Receivable, Interest Income, Accrual Method		0	1	1	11
Impaired Financing Receivable, Recorded Investment		49		49		49			48
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Financing Receivable, Recorded Investment, Nonaccrual Status		46		46		46			36
Impaired Financing Receivable, Related Allowance		0		0		0			0
Impaired Financing Receivable, Unpaid Principal Balance		59		59		59			56
Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		11,224		11,224		11,224			10,730
Financing Receivable, Recorded Investment, Current		11,165		11,165		11,165			10,664
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		34		34		34			34
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		25		25		25			32
Financing Receivable, Recorded Investment, Past Due		59		59		59			66
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1		1		1			3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	27		27		27			32
Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		174		174		174			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		173		173		173
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		332		332		332			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		1		1		1			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		7,548		7,548		7,548			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		48		48		48			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		7,500		7,500		7,500
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		26		26		26
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		2		2		2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	41		41		41			49
Municipal [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		1,563		1,563		1,563			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		1,563		1,563		1,563
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		23,539		23,539		23,539			22,926
Financing Receivable, Recorded Investment, Current		23,400		23,400		23,400			22,740
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		66		66		66			90
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		73		73		73			96
Financing Receivable, Recorded Investment, Past Due		139		139		139			186
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		8		8		8			17
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	106		106		106			204
Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		2,295		2,295		2,295			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		0		0		0			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		2,295		2,295		2,295
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]	0		0		0			0
Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		8,752		8,752		8,752			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		24		24		24			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		8,728		8,728		8,728
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		16		16		16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		8		8		8
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		3		3		3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	32		32		32			25
Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		11,047		11,047		11,047			11,124
Financing Receivable, Recorded Investment, Current		11,023		11,023		11,023			11,093
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		16		16		16			16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		8		8		8			15
Financing Receivable, Recorded Investment, Past Due		24		24		24			31
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		3		3		3			2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	32		32		32			25
Home Equity Line of Credit [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		2,884		2,884		2,884			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		12		12		12			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		2,872		2,872		2,872
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		5		5		5
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]	4		4		4			5
One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		7,039		7,039		7,039			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		7,008		7,008		7,008
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		15		15		15
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		16		16		16
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	23		23		23			27
Construction And Other Consumer Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		644		644		644			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		10		10		10			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		634		634		634
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		10		10		10
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
Revolving Credit Facility [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		483		483		483			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		5		5		5			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		478		478		478
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		2		2		2
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		114		114		114			139
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2	0	2	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		1		1		1			2
Accruing [Member] | One Through Four Family Residential [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		40		40		40			36
Accruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		26		26		26			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		54		54		54			53
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		2
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] | Owner Occupied [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		20		20		20			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		2		2
Nonaccruing [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		204		204		204			226
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	6	2
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]
Loans and Leases Receivable, Gross, Consumer, Mortgage		10		10		10			8
Nonaccruing [Member] | Commercial And Industrial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		58		58		58			62
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	5	1
Nonaccruing [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		90		90		90			87
Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		11		11		11			9
Nonaccruing [Member] | Commercial Real Estate [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		10		10		10			5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0
Nonaccruing [Member] | Construction and Land Development [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment				0
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	$ 0	1	$ 1
Nonaccruing [Member] | Term [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		10		10		10			5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0
Outstanding Loan Balances [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment		201		201		201
Financing Receivable, Collectively Evaluated for Impairment		23,338		23,338		23,338
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		74		74		74
Financing Receivable, Collectively Evaluated for Impairment		11,150		11,150		11,150
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		65		65		65
Financing Receivable, Collectively Evaluated for Impairment		10,982		10,982		10,982
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		44,588		44,588		44,588			42,987
Pass [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		13,416		13,416		13,416			13,001
Leases Receivable, Gross, Commercial, Lease Financing		318		318		318			342
Commercial Lending Loans - Owner Occupied		7,253		7,253		7,253			6,920
Loans and Leases Receivable, Gross, Commercial, Governments		1,536		1,536		1,536			1,257
Loans and Leases Receivable, before Fees, Gross		22,523		22,523		22,523			21,520
Pass [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		11,150		11,150		11,150			10,649
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,866		2,866		2,866			2,759
Loans and Leases Receivable, Gross, Consumer, Mortgage		6,988		6,988		6,988			6,602
Loans and Leases Receivable, Gross, Consumer, Construction		642		642		642			596
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		480		480		480			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		8,631		8,631		8,631			8,816
Loans Receivable, Gross, Commercial, Real Estate		10,915		10,915		10,915			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		2,284		2,284		2,284
Special Mention [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		438		438		438			660
Special Mention [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		311		311		311			395
Leases Receivable, Gross, Commercial, Lease Financing		10		10		10			6
Commercial Lending Loans - Owner Occupied		84		84		84			93
Loans and Leases Receivable, Gross, Commercial, Governments		4		4		4			13
Loans and Leases Receivable, before Fees, Gross		409		409		409			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		18		18		18			138
Loans Receivable, Gross, Commercial, Real Estate		29		29		29			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		11		11		11
Substandard [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		784		784		784			1,132
Substandard [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		369		369		369			606
Leases Receivable, Gross, Commercial, Lease Financing		4		4		4			16
Commercial Lending Loans - Owner Occupied		211		211		211			275
Loans and Leases Receivable, Gross, Commercial, Governments		23		23		23			1
Loans and Leases Receivable, before Fees, Gross		607		607		607			898
Substandard [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		74		74		74			81
Loans and Leases Receivable, Gross, Consumer, Home Equity		18		18		18			18
Loans and Leases Receivable, Gross, Consumer, Mortgage		51		51		51			60
Loans and Leases Receivable, Gross, Consumer, Construction		2		2		2			1
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card		3		3		3			2
Loans and Leases Receivable, Gross, Consumer, Other		0		0		0			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		103		103		103			149
Loans Receivable, Gross, Commercial, Real Estate		103		103		103			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		0		0		0
Doubtful [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		0		0		0			1
Doubtful [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial and Industrial		0		0		0			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		0		0		0			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
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross		480		480		480			518
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Consumer Loan [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		51		51		51
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Commercial [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		314		314		314			371
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross									44
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Loans Receivable, Gross, Commercial, Real Estate		115		115		115			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		33		33		33			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		72		72		72			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		12		12		12			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		46		46		46			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		44		44		44			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		0		0		0			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		44		44		44			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		0		0		0
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		26		26		26
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		21		21		21
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		5		5		5
Impaired Financing Receivable Related Allowance [Member]
Loans And Allowance For Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment		102		102		102			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		47		47		47			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		28		28		28			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		6		6		6			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]	18		18		18			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]	2		2		2			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]	36		36		36			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]	18		18		18			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]	1		1		1			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]	4		4		4			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]	2		2		2			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]	15		15		15			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]	1		1		1
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]	64		64		64			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]	117		117		117			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]	53		53		53			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]	1		1		1			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]	7		7		7			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]	16		16		16
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		6		6		6			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		10		10		10			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		1		1		1
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		11		11		11			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		19		19		19			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		8		8		8			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		0		0		0			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		1		1		1			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		2		2		2
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		17		17		17			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		3		3		3			8
Principal Forgiveness [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Loans And Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment		2		2		2			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		6		6		6			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		8		8		8			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		5		5		5			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		4		4		4			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		2		2		2			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 Credi_4

Loans And Allowance For Credit Losses (Summary Of Major Portfolio Segment And Specific Loan Class) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at end of period	$ 480	$ 541	$ 480	$ 541
Loans held for sale	61		61			$ 44
Commercial and industrial	14,096		14,096			14,003
Leasing	332		332			364
Owner occupied	7,548		7,548			7,288
Municipal	1,563		1,563			1,271
Land Development Loans, Loans Receivable Commercial Construction and Land Development	2,295		2,295			2,021
Term	8,752		8,752			9,103
Provision for loan losses	11	(5)	46	(35)
Allowance for Loan and Lease Losses, Write-offs	17	25	56	117
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	18	17	64	56
Net loan and lease charge-offs	(1)	8	(8)	61
Reserve for unfunded lending commitments	58	59	58	59	$ 58	58	$ 63	$ 65
Provision for Unfunded Lending Commitments (decrease)	0	(4)	0	(6)
Allowance for loan and lease losses and reserve for unfunded lending commitments	538	$ 600	538	$ 600
Loans Receivable, Gross, Commercial, Real Estate	11,047		11,047			11,124
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,884		2,884			2,777
Loans and Leases Receivable, Gross, Consumer, Mortgage	7,039		7,039			6,662
Loans and Leases Receivable, Gross, Consumer, Construction	644		644			597
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	483		483			509
Loans and Leases Receivable, Gross, Consumer, Other	174		174			185
Loans and Leases Receivable, Gross	45,810		45,810			44,780
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross	23,539		23,539			22,926
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross	$ 11,224		$ 11,224			$ 10,730

Loans And Allowance For Credi_5

Loans And Allowance For Credit Losses (Summary Of Changes In The Allowance For Credit Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	$ 11	$ (5)	$ 46	$ (35)
Allowance for Loan and Lease Losses, Write-offs	17	25	56	117
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	490	544	518	567
Allowance for Loan and Lease Losses, Adjustments, Other	(1)	8	(8)	61
Balance at end of period	58	59	58	59
Allowance for loan losses	490	544	518	567	$ 480	$ 490	$ 518	$ 541	$ 544	$ 567
Reserve for unfunded lending commitments	58	59	58	59	58	58	58	59	63	65
Allowance for loan and lease losses and reserve for unfunded lending commitments					538			600
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	18	17	64	56
Provision for Unfunded Lending Commitments (decrease)	0	(4)	0	(6)
Balance at end of period	480	541	480	541
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	11	4	69	(27)
Allowance for Loan and Lease Losses, Write-offs	8	16	38	98
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	321	393	371	420
Allowance for Loan and Lease Losses, Adjustments, Other	(4)	4	(12)	62
Balance at end of period	42	49	42	49
Allowance for loan losses	321	393	371	420	314	321	371	385	393	420
Reserve for unfunded lending commitments	42	49	42	49	42	43	48	49	53	54
Allowance for loan and lease losses and reserve for unfunded lending commitments					356			434
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	12	12	50	36
Provision for Unfunded Lending Commitments (decrease)	(1)	(4)	(6)	(5)
Balance at end of period	314	385	314	385
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	5	7	(9)	15
Allowance for Loan and Lease Losses, Write-offs	5	4	5	6
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	122	116	103	116
Allowance for Loan and Lease Losses, Adjustments, Other	2	2	(3)	(6)
Balance at end of period	16	10	16	10
Allowance for loan losses	122	116	103	116	115	122	103	107	116	116
Reserve for unfunded lending commitments	16	10	16	10	16	15	10	10	10	11
Allowance for loan and lease losses and reserve for unfunded lending commitments					131			117
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	3	2	8	12
Provision for Unfunded Lending Commitments (decrease)	1	0	6	(1)
Balance at end of period	115	107	115	107
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Provision for Loss, Gross	(5)	(16)	(14)	(23)
Allowance for Loan and Lease Losses, Write-offs	4	5	13	13
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	47	35	44	31
Allowance for Loan and Lease Losses, Adjustments, Other	1	2	7	5
Balance at end of period	0	0	0	0
Allowance for loan losses	47	35	44	31	51	47	44	49	35	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					$ 51			$ 49
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	3	3	6	8
Provision for Unfunded Lending Commitments (decrease)	0	0	0	0
Balance at end of period	$ 51	$ 49	$ 51	$ 49

Loans And Allowance For Credi_6

Loans And Allowance For Credit Losses (Summary Of ALLL And Outstanding Loan Balances According To The Company's Impairment Method) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 299	$ 601	$ 273	$ 559
Impaired Financing Receivable, Interest Income, Accrual Method	0	5	9	23
Allowance for loan losses: Individually evaluated for impairment	(14)		(14)			$ (31)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	466		466			487
Financing Receivable, Individually Evaluated for Impairment	340		340			459
Financing Receivable, Collectively Evaluated for Impairment	45,470		45,470			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	45,810		45,810			44,780
Financing Receivable, Allowance for Credit Losses	0		0			0
Loans and Leases Receivable, Allowance	480	541	480	541	$ 490	518	$ 544	$ 567
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	51	104	46	101
Impaired Financing Receivable, Interest Income, Accrual Method	0	2	8	5
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: Individually evaluated for impairment	(10)		(10)			(26)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	304		304			345
Financing Receivable, Individually Evaluated for Impairment						314
Financing Receivable, Collectively Evaluated for Impairment						22,598
Loans and Leases Receivable, Gross	23,539		23,539			22,926
Financing Receivable, Allowance for Credit Losses	0		0			0
Loans and Leases Receivable, Allowance	314	385	314	385	321	371	393	420
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	1	10	1	11
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Allowance for loan losses: Individually evaluated for impairment	(1)		(1)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	114		114
Financing Receivable, Allowance for Credit Losses	0		0			0
Loans and Leases Receivable, Allowance	115	107	115	107	122	103	116	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	48		48			40
Financing Receivable, Individually Evaluated for Impairment						76
Financing Receivable, Collectively Evaluated for Impairment						10,648
Loans and Leases Receivable, Gross	11,224		11,224			10,730
Financing Receivable, Allowance for Credit Losses	0		0			0
Loans and Leases Receivable, Allowance	51	49	51	49	$ 47	44	$ 35	$ 31
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	176	461	155	413
Impaired Financing Receivable, Interest Income, Accrual Method	0	3	8	10
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	49	53	50	58
Impaired Financing Receivable, Interest Income, Accrual Method	0	1	1	11
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	50	63	51	69
Impaired Financing Receivable, Interest Income, Accrual Method	0	1	1	11
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	11,047		11,047			11,124
Loans and Leases Receivable, Allowance	115		115			103
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	14	21	13	21
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	1
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	58	53	53	53
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	1	2	1	2
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	73	77	67	77
Impaired Financing Receivable, Interest Income, Accrual Method	0	1	0	2
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	201		201
Financing Receivable, Collectively Evaluated for Impairment	23,338		23,338
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	65		65
Financing Receivable, Collectively Evaluated for Impairment	10,982		10,982
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	74		74
Financing Receivable, Collectively Evaluated for Impairment	11,150		11,150
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 Credi_7

Loans And Allowance For Credit Losses (Summary Of Nonaccrual Loans) (Details) - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	[1]	$ 165	$ 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		2	8
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		66	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		181	294
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		46	36
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		46	40
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		13	13
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		47	55
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		0	0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		61	68
Financing Receivables, Total [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total		$ 288	$ 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 Credi_8

Loans And Allowance For Credit Losses (Summary Of Past Due Loans (Accruing And Nonaccruing)) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 3	$ 1	$ 8	$ 2	$ 84
Financing Receivable, Recorded Investment, Current		45,588		45,588			$ 44,497
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		116		116			140
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		106		106			143
Financing Receivable, Recorded Investment, Past Due		222		222			283
Loans and Leases Receivable, Gross		45,810		45,810			44,780
Accruing loans 90+ days past due		12		12			22
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	165		165			261
Bankcard And Other Revolving Plans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		1		1			0
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	5	1
Financing Receivable, Recorded Investment, Nonaccrual Status		112		112			195
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		23,539		23,539			22,926
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	6	2
Financing Receivable, Recorded Investment, Nonaccrual Status		181		181			294
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		11,224		11,224			10,730
Financing Receivable, Recorded Investment, Nonaccrual Status		0		0			0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		61		61			68
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		2		2			8
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	1	1
Financing Receivable, Recorded Investment, Nonaccrual Status		66		66			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		46		46			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		11,047		11,047			11,124
Financing Receivable, Recorded Investment, Nonaccrual Status		46		46			40
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		13		13			13
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		47		47			55
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		0		0			0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		11,165		11,165			10,664
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		34		34			34
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		25		25			32
Financing Receivable, Recorded Investment, Past Due		59		59			66
Loans and Leases Receivable, Gross		11,224		11,224			10,730
Accruing loans 90+ days past due		1		1			3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	27		27			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		174		174			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		173		173
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		5		5			3
Loans and Leases Receivable, Gross		483		483			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		478		478
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		3		3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		2		2
Accruing loans 90+ days past due		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		10		10			7
Loans and Leases Receivable, Gross		644		644			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		634		634
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		10		10
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		0		0
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	0		0			0
One Through Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							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		7,039		7,039			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		7,008		7,008
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		15		15
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		16		16
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	23		23			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		12		12			14
Loans and Leases Receivable, Gross		2,884		2,884			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		2,872		2,872
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		5		5
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]	4		4			5
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		11,023		11,023			11,093
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		16		16			16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		8		8			15
Financing Receivable, Recorded Investment, Past Due		24		24			31
Loans and Leases Receivable, Gross		11,047		11,047			11,124
Accruing loans 90+ days past due		3		3			2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	32		32			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		24		24			24
Loans and Leases Receivable, Gross		8,752		8,752			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		8,728		8,728
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		16		16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		8		8
Accruing loans 90+ days past due		3		3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	32		32			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		0		0			7
Loans and Leases Receivable, Gross		2,295		2,295			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		2,295		2,295
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]	0		0			0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		23,400		23,400			22,740
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		66		66			90
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		73		73			96
Financing Receivable, Recorded Investment, Past Due		139		139			186
Loans and Leases Receivable, Gross		23,539		23,539			22,926
Accruing loans 90+ days past due		8		8			17
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	106		106			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		1,563		1,563			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		1,563		1,563
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		48		48			69
Loans and Leases Receivable, Gross		7,548		7,548			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		7,500		7,500
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		26		26
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		22		22
Accruing loans 90+ days past due		2		2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	41		41			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		1		1			1
Loans and Leases Receivable, Gross		332		332			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		331		331
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		0		0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		1		1
Accruing loans 90+ days past due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	1		1			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		90		90			116
Loans and Leases Receivable, Gross		14,096		14,096			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		14,006		14,006
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		40		40
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		50		50
Accruing loans 90+ days past due		6		6
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	63		63			146
loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		61		61			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		61		61			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		2	0	2	0
Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Accruing [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Accruing [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Accruing [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2
Nonaccruing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	6	2
Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	5	1
Nonaccruing [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	6	2
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	$ 0	1	$ 1
Nonaccruing [Member] | Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		$ 0
Nonaccruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 0
[1]	1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.

Loans And Allowance For Credi_9

Loans And Allowance For Credit Losses (Summary Of Outstanding Loan Balances (Accruing And Nonaccruing) Categorized By Credit Quality Indicators) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 3	$ 1	$ 8	$ 2	$ 84
Financing Receivable, Recorded Investment, Current		45,588		45,588			$ 44,497
Loans held for sale		61		61			44
Commercial and industrial		14,096		14,096			14,003
Leasing		332		332			364
Owner occupied		7,548		7,548			7,288
Municipal		1,563		1,563			1,271
Land Development Loans, Loans Receivable Commercial Construction and Land Development		2,295		2,295			2,021
Term		8,752		8,752			9,103
Loans Receivable, Gross, Commercial, Real Estate		11,047		11,047			11,124
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,884		2,884			2,777
1-4 family residential		7,039		7,039			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		644		644			597
Bankcard and other revolving plans		483		483			509
Other		174		174			185
Loans and Leases Receivable, Gross		45,810		45,810			44,780
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		116		116			140
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		106		106			143
Financing Receivable, Recorded Investment, Past Due		222		222			283
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		12		12			22
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	165		165			261
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		11,224		11,224			10,730
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,884		2,884			2,777
1-4 family residential		7,039		7,039			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		644		644			597
Bankcard and other revolving plans		483		483			509
Other		174		174			185
Loans and Leases Receivable, Gross		11,224		11,224			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		8,752		8,752			9,103
Loans Receivable, Gross, Commercial, Real Estate		11,047		11,047			11,124
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		14,096		14,096			14,003
Leasing		332		332			364
Owner occupied		7,548		7,548			7,288
Municipal		1,563		1,563			1,271
Loans and Leases Receivable, before Fees, Gross		23,539		23,539			22,926
Loans and Leases Receivable, Gross		23,539		23,539			22,926
Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		44,588		44,588			42,987
Pass [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		11,150		11,150			10,649
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,866		2,866			2,759
1-4 family residential		6,988		6,988			6,602
Loans and Leases Receivable, Gross, Consumer, Construction		642		642			596
Bankcard and other revolving plans		480		480			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		8,631		8,631			8,816
Loans Receivable, Gross, Commercial, Real Estate		10,915		10,915			10,818
Pass [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		13,416		13,416			13,001
Leasing		318		318			342
Owner occupied		7,253		7,253			6,920
Municipal		1,536		1,536			1,257
Loans and Leases Receivable, before Fees, Gross		22,523		22,523			21,520
Special Mention [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		438		438			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		18		18			138
Loans Receivable, Gross, Commercial, Real Estate		29		29			153
Special Mention [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		311		311			395
Leasing		10		10			6
Owner occupied		84		84			93
Municipal		4		4			13
Loans and Leases Receivable, before Fees, Gross		409		409			507
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		480		480			518
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross							44
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans Receivable, Gross, Commercial, Real Estate		115		115			103
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		314		314			371
Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		0		0			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		0		0			1
Leasing		0		0			0
Owner occupied		0		0			0
Municipal		0		0			0
Loans and Leases Receivable, before Fees, Gross		0		0			1
Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross		784		784			1,132
Substandard [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, before Fees, Gross		74		74			81
Loans and Leases Receivable, Gross, Consumer, Home Equity		18		18			18
1-4 family residential		51		51			60
Loans and Leases Receivable, Gross, Consumer, Construction		2		2			1
Bankcard and other revolving plans		3		3			2
Other		0		0			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		103		103			149
Loans Receivable, Gross, Commercial, Real Estate		103		103			153
Substandard [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and industrial		369		369			606
Leasing		4		4			16
Owner occupied		211		211			275
Municipal		23		23			1
Loans and Leases Receivable, before Fees, Gross		607		607			898
loans held for sale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current		61		61			44
Loans and Leases Receivable, Gross		61		61			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		14,096		14,096			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		90		90			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		11,165		11,165			10,664
Loans and Leases Receivable, Gross		11,224		11,224			10,730
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		34		34			34
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		25		25			32
Financing Receivable, Recorded Investment, Past Due		59		59			66
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1		1			3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	27		27			32
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Current							184
Loans and Leases Receivable, Gross		174		174			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		173		173
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		8,752		8,752			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		24		24			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		2,295		2,295			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		0		0			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		2,295		2,295
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
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		332		332			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		1		1			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		7,548		7,548			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		48		48			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		1,563		1,563			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		11,023		11,023			11,093
Loans and Leases Receivable, Gross		11,047		11,047			11,124
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		16		16			16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		8		8			15
Financing Receivable, Recorded Investment, Past Due		24		24			31
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		3		3			2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	32		32			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		2,884		2,884			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		12		12			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		23,400		23,400			22,740
Loans and Leases Receivable, Gross		23,539		23,539			22,926
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		66		66			90
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		73		73			96
Financing Receivable, Recorded Investment, Past Due		139		139			186
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		8		8			17
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	106		106			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		7,039		7,039			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		644		644			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		$ 10		$ 10			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 Cred_10

Loans And Allowance For Credit Losses (Summary Of Information On Impaired Loans) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	$ 2,884		$ 2,884		$ 2,777
Unpaid principal balance	385		385		573
Impaired Financing Receivable, Recorded Investment	304		304		461
Impaired Financing Receivable, Related Allowance	13		13		30
Average recorded investment	299	$ 601	273	$ 559
Interest income recognized	0	5	9	23
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	170		170		293
Impaired Financing Receivable, Recorded Investment	119		119
Impaired Financing Receivable, Related Allowance	8		8		24
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	66		66		120
Impaired Financing Receivable, Recorded Investment	60		60		102
Impaired Financing Receivable, Related Allowance	2		2		2
Average recorded investment	51	104	46	101
Interest income recognized	0	2	8	5
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	237		237		414
Impaired Financing Receivable, Recorded Investment	180		180		325
Impaired Financing Receivable, Related Allowance	10		10		26
Average recorded investment	176	461	155	413
Interest income recognized	0	3	8	10
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					6
Average recorded investment	1	10	1	11
Interest income recognized	0	0	0	0
Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	59		59		56
Impaired Financing Receivable, Recorded Investment	49		49		48
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	49	53	50	58
Interest income recognized	0	1	1	11
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	60		60		64
Impaired Financing Receivable, Recorded Investment	50		50		54
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	50	63	51	69
Interest income recognized	0	1	1	11
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	16		16		25
Impaired Financing Receivable, Recorded Investment	14		14		22
Impaired Financing Receivable, Related Allowance	3		3		0
Average recorded investment	14	21	13	21
Interest income recognized	0	0	0	1
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,884		2,884		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	0		0		4
Average recorded investment	58	53	53	53
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	1		1		2
Impaired Financing Receivable, Related Allowance	0		0		0
Average recorded investment	1	2	1	2
Interest income recognized	0	0	0	0
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	88		88		95
Impaired Financing Receivable, Recorded Investment	74		74		82
Impaired Financing Receivable, Related Allowance	3		3		4
Average recorded investment	73	77	67	77
Interest income recognized	0	1	0	2
Impaired Financing Receivable Related Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	102		102		218
Impaired Financing Receivable Related Allowance [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment	47		47		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	68		68		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	6		6		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	28		28		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	72		72		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	112		112		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	44		44		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	44		44		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	12		12		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	33		33		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	46		46		43
Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Recorded Investment					$ 222
Average recorded investment	124	356
Interest income recognized	$ 0	$ 1
Commercial and Industrial Sector [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Average recorded investment			108	311
Interest income recognized			$ 0	$ 5

Loans And Allowance For Cred_11

Loans And Allowance For Credit Losses (Summary Of Selected Information On TDRs That Includes Recorded Investment On An Accruing And Nonaccruing Basis By Loan Class And Modification Type) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 3	$ 1	$ 8	$ 2	$ 84
1-4 family residential		7,039		7,039			$ 6,662
Construction and other consumer real estate		644		644			597
Commercial and industrial		14,096		14,096			14,003
Home equity credit line		2,884		2,884			2,777
Bankcard and other revolving plans		483		483			509
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	5	1
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	1	1
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	6	2
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
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		7,039		7,039			6,662
Construction and other consumer real estate		644		644			597
Home equity credit line		2,884		2,884			2,777
Bankcard and other revolving plans		483		483			509
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2	0	2	0
Recorded investment resulting from the following modification types		114		114			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		26		26			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		20		20			23
Commercial Municipal Loans		0		0
Accruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Recorded investment resulting from the following modification types		46		46			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] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2		2
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		2
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		13		13			15
Accruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		40		40			36
Accruing [Member] | Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Construction and other consumer real estate		1		1			2
Accruing [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		54		54			53
Accruing [Member] | Interest Rate Below Market [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		6		6			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		1		1			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		11		11			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		6		6			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]	18		18			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]	16		16			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]	2		2			3
Accruing [Member] | Multiple Modification Types [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	64		64			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]	23		23			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		1	1	6	2
Recorded investment resulting from the following modification types		204		204			226
Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	5	1
Commercial and industrial		58		58			62
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	1	1
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		1	$ 1	6	$ 2
Recorded investment resulting from the following modification types		69		69			73
Nonaccruing [Member] | Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment				0
Nonaccruing [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		10		10			5
Nonaccruing [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		10		10			5
Nonaccruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Home equity credit line		1		1			1
Nonaccruing [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
1-4 family residential		10		10			8
Nonaccruing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		11		11			9
Nonaccruing [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		90		90			87
Nonaccruing [Member] | Interest Rate Below Market [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		10		10			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		19		19			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		8		8			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		8		8			6
Nonaccruing [Member] | Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		17		17			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		2		2			3
Nonaccruing [Member] | Principal Forgiveness [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		3		3			8
Nonaccruing [Member] | Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		5		5			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		2		2			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		4		4			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]	36		36			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]	13		13			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]	4		4			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]	1		1			1
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[1]	18		18			30
Nonaccruing [Member] | Multiple Modification Types [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	117		117			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]	44		44			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]	1		1			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]	53		53			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		1		1
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		2		2
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		1		1			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		0		0			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		6		6			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		8		8			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]	15		15			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]	1		1
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]	2		2			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]	7		7			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]	16		16
Commercial Municipal Loans		0		0
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	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		0		0
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types		0		0
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
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		1		1			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		2		2
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]	12		12			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]	4		4
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]	1		1			1
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
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]	38		38			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		1		1
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Recorded investment resulting from the following modification types	[2]	1		1
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 Cred_12

Loans And Allowance For Credit Losses (Summary Of Net Financial Impact On Interest Income Due To Interest Rate Modifications Below Market For Accruing TDR Loans) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 3	$ 1	$ 8	$ 2	$ 84
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,884		2,884			$ 2,777
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,884		2,884			$ 2,777
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	1	1
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1	1	6	2
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
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1	1	6	2
Nonaccruing [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	1	1
Nonaccruing [Member] | Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1	1	6	2
Nonaccruing [Member] | Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		0
Nonaccruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2	0	2	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	2		$ 2
Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 2

Loans And Allowance For Cred_13

Loans And Allowance For Credit Losses (Schedule Of Investment Of Accruing And Nonaccruing Loans Modified As Troubled Debt Restructurings) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		$ 14,096		$ 14,096			$ 14,003
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		3	$ 1	8	$ 2	$ 84
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,884		2,884			2,777
Loans and Leases Receivable, Gross, Consumer, Mortgage		7,039		7,039			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		644		644			597
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		2	0	2	0
Financing Receivable, Modifications, Recorded Investment		114		114			139
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	6	2
Financing Receivable, Modifications, Recorded Investment		204		204			226
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	5	1
Commercial And Industrial [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans Receivable, Gross, Commercial and Industrial		26		26			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		58		58			62
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	1	5	1
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	1	1
Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	0	0
Financing Receivable, Modifications, Recorded Investment		20		20			23
Owner Occupied [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0	0	1	1
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		1	1	6	2
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		46		46			70
Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		1	$ 1	6	$ 2
Financing Receivable, Modifications, Recorded Investment		69		69			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		2		2
Financing Receivable, Modifications, Recorded Investment		13		13			14
Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		0		0
Financing Receivable, Modifications, Recorded Investment		10		10			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		2
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		0
Financing Receivable, Modifications, Recorded Investment		10		10			5
Home Equity Credit Line [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		13		13			15
Home Equity Credit Line [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		1		1			1
One Through Four Family Residential [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		40		40			36
One Through Four Family Residential [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage		10		10			8
Construction And Other Consumer Real Estate [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Construction		1		1			2
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity		2,884		2,884			2,777
Loans and Leases Receivable, Gross, Consumer, Mortgage		7,039		7,039			6,662
Loans and Leases Receivable, Gross, Consumer, Construction		644		644			597
Consumer Portfolio Segment [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		11		11			9
Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		54		54			53
Consumer Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		90		90			87
Interest Rate Below Market [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		6		6			8
Interest Rate Below Market [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		10		10			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		1		1			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		11		11			6
Maturity Or Team Extension [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		19		19			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		6		6			3
Maturity Or Team Extension [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		8		8			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		8		8			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		17		17			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		2		2			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		3		3			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		5		5			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		2		2			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		4		4			3
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	18		18			22
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	36		36			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]	16		16			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]	13		13			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]	4		4			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]	1		1			1
Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[1]	2		2			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]	18		18			30
Multiple Modification Types [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	64		64			86
Multiple Modification Types [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	117		117			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]	23		23			47
Multiple Modification Types [Member] | Commercial Loan [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	44		44			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]	1		1			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]	53		53			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		0		0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment		0		0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Home Equity Line of Credit [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
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		1		1			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		2		2
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]	12		12			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]	4		4
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]	1		1			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]	38		38			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		1		1
Nonaccruing [Member] | Multiple Modification Types [Member] | Term [Member] | Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	1		1
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		1		1
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		2		2
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		1		1			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		0		0			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		8		8			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		6		6			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]	15		15			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]	1		1
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]	2		2			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]	7		7			33
Accruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	[2]	16		16
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 Cred_14

Loans And Allowance For Credit Losses (Schedule Of Outstanding Balances Of All Required Payments And The Related Carrying Amounts For PCI Loans) (Details) - USD ($) $ in Millions		Sep. 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		$ 222	$ 283
Financing Receivable, Recorded Investment, Current		45,588	44,497
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		116	140
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		106	143
Loans and Leases Receivable, Gross		45,810	44,780
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		12	22
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	165	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		61	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		61	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		90	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		14,096	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		1	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		332	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		48	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		7,548	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		1,563	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		139	186
Financing Receivable, Recorded Investment, Current		23,400	22,740
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		66	90
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		73	96
Loans and Leases Receivable, Gross		23,539	22,926
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		8	17
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	106	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		0	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		2,295	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		24	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		8,752	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		24	31
Financing Receivable, Recorded Investment, Current		11,023	11,093
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		16	16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		8	15
Loans and Leases Receivable, Gross		11,047	11,124
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		3	2
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	32	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		12	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		2,884	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		7,039	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		10	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		644	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		5	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		483	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		174	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		59	66
Financing Receivable, Recorded Investment, Current		11,165	10,664
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due		34	34
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due		25	32
Loans and Leases Receivable, Gross		11,224	10,730
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		1	3
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	$ 27	$ 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 He_4

Derivative Instruments And Hedging Activities (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Derivative [Line Items]
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion				$ (6)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax		$ (1)	$ 0	(8)	$ 0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(1)	0	(3)	3
Fair values of derivative assets reduced (increased) by net credit valuation adjustments		1	4	1	4
Total derivatives, Notional amount		7,119		7,119		$ 6,824
Cash collateral pledged for derivative liabilities		38		38
Additional collateral that would be required to be pledge if credit rating was downgraded by one notch		0		0
Derivative Instrument, Noninterest Income (Expense)		14	8	25	19
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		1,213		1,213		1,138
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		5,906		5,906		5,686
Interest Rate Swap [Member] | Derivatives Designated As Hedging Instruments [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax		(1)	0	(8)	0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	[1]	(1)	0	(3)	3
Total derivatives, Notional amount		713		713		1,138
Interest Rate Swap [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		237		237		223
Derivative Instrument, Noninterest Income (Expense)			0
Interest Rate Swaps For Customers [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		5,345		5,345		4,550
Derivative Instrument, Noninterest Income (Expense)		8	4	12	8
Foreign Exchange [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		324		324		913
Derivative Instrument, Noninterest Income (Expense)		6	$ 4	13	$ 12
Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		76		76		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 Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		76		76		40
Other Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Gross amounts recognized		76		76		40
Other Liabilities [Member] | Interest Rate Swap [Member] | Derivatives Designated As Hedging Instruments [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0		0
Other Liabilities [Member] | Interest Rate Swap [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0		0
Other Liabilities [Member] | Interest Rate Swaps For Customers [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		73		73		33
Other Liabilities [Member] | Foreign Exchange [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		$ 3		$ 3		$ 7
[1]	Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). For the 12 months following September 30, 2018, we estimate that $(6) million will be reclassified from AOCI into interest income

Derivative Instruments And He_5

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		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Derivative [Line Items]
Long-term Debt		$ 879		$ 879		$ 383
Interest Rate Derivatives, at Fair Value, Net		$ 0	$ 0	$ 0	$ 0
Types of Items Hedged by Interest Rate Derivatives		1,000,000	0	1,000,000	0
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge		$ (1)	$ 0	$ (1)	$ 0
Total derivatives, Notional amount		7,119		7,119		6,824
Amount of derivative gain (loss), recognized in OCI		(1)	0	(8)	0
Amount of derivative gain (loss), Reclassified from AOCI to interest income		(1)	0	(3)	3
Derivatives instruments, Noninterest income (expense)		14	8	25	19
Derivatives designated as hedging instruments, Offset to interest expense		0	0	0	0
Long-term Debt [Member]
Derivative [Line Items]
Hedged Liability, Fair Value Hedge		(499)		(499)		0
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)		1		1		0
Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		23		23		38
Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		76		76		40
Derivatives Designated As Hedging Instruments [Member]
Derivative [Line Items]
Total derivatives, Notional amount		1,213		1,213		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 Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Total derivatives, Notional amount		713		713		1,138
Amount of derivative gain (loss), recognized in OCI		(1)	0	(8)	0
Amount of derivative gain (loss), Reclassified from AOCI to interest income	[1]	(1)	0	(3)	3
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swap [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Total derivatives, Notional amount		500		500		0
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swap [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 Swap [Member] | Other Assets [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		0		0		0
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Liabilities [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		0		0		0
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Liabilities [Member] | Fair Value 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		5,906		5,906		5,686
Derivatives Not Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		23		23		38
Derivatives Not Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		76		76		40
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member]
Derivative [Line Items]
Total derivatives, Notional amount		324		324		913
Derivatives instruments, Noninterest income (expense)		6	4	13	12
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		4		4		9
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		3		3		7
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Total derivatives, Notional amount		237		237		223
Derivatives instruments, Noninterest income (expense)			0
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		1		1		1
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [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		5,345		5,345		4,550
Derivatives instruments, Noninterest income (expense)		8	$ 4	12	$ 8
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives hedging instruments, assets		18		18		28
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps For Customers [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives hedging instruments, liabilities		$ 73		$ 73		$ 33
[1]	Amounts recognized in OCI and reclassified from AOCI represent the effective portion of the derivative gain (loss). For the 12 months following September 30, 2018, we estimate that $(6) million will be reclassified from AOCI into interest income

Debt And Shareholders' Equity_2

Debt And Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	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) September 30, December 31, 2017 Subordinated notes $ 247 $ 247 Senior notes 632 135 Capital lease obligations — 1 Total $ 879 $ 383
Subordinated Debt	$ 247,000,000		$ 247,000,000		$ 247,000,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(224,000,000)	$ 67,000,000
Stockholders' Equity [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(2,000,000)	2,000,000
Senior Notes	$ 632,000,000		$ 632,000,000		135,000,000
Debt Instrument, Interest Rate Terms			0.035
Debt Instrument, Call Feature			162,000,000
Common Stock, Par or Stated Value Per Share	$ 0.0010		$ 0.0010
Common Stock	$ 192,169		$ 192,169		4,445,000,000
Capital Lease Obligations	0		0		1,000,000
Long-term Debt, Gross	$ 879,000,000		$ 879,000,000		383,000,000
Stock Repurchased During Period, Shares	3.5	4.7	8
Repurchase of Bank Common Stock			$ 420,000,000
Stock Repurchased and Retired During Period, Value	$ 185,000,000	$ 205,000,000	$ (434,000,000)	(217,000,000)
Treasury Stock Acquired, Average Cost Per Share	$ 52.86	$ 43.72	$ 53.84
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 250,000,000		$ 250,000,000
Net Shares Issued From Stock Warrant Exercises	1.3
Warrants Sold	3.9
Class of Warrant or Right, Outstanding	1.9		1.9
Warrant Exercise Price	$ 36.27		$ 36.27
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (361,000,000)	$ (57,000,000)	$ (361,000,000)	$ (57,000,000)	$ (139,000,000)	$ (122,000,000)
Warrant [Member]
Stockholders' Equity [Abstract]
Class of Warrant or Right, Outstanding	29.3		29.3
Warrant Exercise Price	$ 35.03		$ 35.03
Senior Notes [Member]
Stockholders' Equity [Abstract]
Senior Notes	$ 500,000,000		$ 500,000,000

Debt And Shareholders' Equity S

Debt And Shareholders' Equity Schedule of Long-Term Debt Instruments (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Net Shares Issued From Stock Warrant Exercises	1.3
Subordinated Debt	$ 247	$ 247	$ 247
Senior Notes	632	632	135
Capital Lease Obligations	0	0	1
Long-term Debt, Gross	$ 879	$ 879	$ 383
Schedule of Long-term Debt Instruments [Table Text Block]		Long-term debt is summarized as follows: (In millions) September 30, December 31, 2017 Subordinated notes $ 247 $ 247 Senior notes 632 135 Capital lease obligations — 1 Total $ 879 $ 383

Debt And Shareholders' Equity_3

Debt And Shareholders' Equity (Schedule Of Changes In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax			$ (73)	$ 40
Income Tax Expense (Benefit)	$ 69	$ 83	195	207
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(224)	67
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			2	(2)
Beginning balance			(139)	(122)	$ (122)
Other comprehensive income (loss)	(45)	(8)	(222)	65
Ending balance	(361)	(57)	(361)	(57)	(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			(73)	40
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Debt And Shareholders' Equity [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(221)	65
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0	0
Beginning balance			(114)	(93)	(93)
Other comprehensive income (loss)			(221)	65
Ending balance	(335)	(28)	(335)	(28)	(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			(3)	2
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			2	(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)	0	(3)		3
Reclassification from AOCI, Current Period, Tax	(1)	0	(2)		2
Income Tax Expense (Benefit)	$ 0	$ 0	$ (1)		$ 1

Commitments, Guarantees, And _3

Commitments, Guarantees, And Contingent Liabilities (Narrative) (Details) $ in Millions	Sep. 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	31
Commitments for Private Equity or Other Non-Interest Bearing Investments Prohibited by the Volcker Rule	2
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 _4

Commitments, Guarantees, And Contingent Liabilities (Schedule Of Guarantees Issued) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Unused Commitments to Extend Credit	$ 20,999	$ 19,583
Commercial Letters Of Credit	20	31
Total Unfunded Lending Commitments	21,888	20,531
Financial [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	673	721
Performance [Member]
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Standby letters of credit	196	$ 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 R_2

Revenue Recognition Revenue Recognitiion Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Service Charges, Commissions and Fees	$ 59	$ 55	$ 168	$ 160
Revenue Recognition [Member]
Interest and Fee Income, Loans, Consumer Installment, Credit Card	36	34	103	101
ATM Fees	2	2	7	7
Other Service Charges	4	4	11	11
Other Commissions and Fees	5	4	15	11
Other Service Charges, Commissions and Fees	$ 47	$ 44	$ 136	$ 130

Revenue Recognition Other Servi

Revenue Recognition Other Service charges, commissions and fees (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Service charges, commissions and fees [Line Items]
Other Service Charges, Commissions and Fees	$ 59	$ 55	$ 168	$ 160
Revenue Recognition [Member]
Other Service charges, commissions and fees [Line Items]
Other Service Charges	4	4	11	11
Other Service Charges, Commissions and Fees	$ 47	$ 44	$ 136	$ 130

Revenue Recognition Revenue by

Revenue Recognition Revenue by Operation Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	$ 42	$ 42	$ 125	$ 127
Noninterest income, Customer-related Fees	125	122	372	357
Noninterest Income	136	139	412	404
Gains (Losses) on Sales of Other Real Estate				1
Other Service Charges, Commissions and Fees	59	55	168	160
Wealth Management and Trust Income	12	11	38	30
Interest Income (Expense), Net	565	522	1,654	1,539
Zions Bank [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	14	16	43	47
Noninterest income, Customer-related Fees	38	39	110	113
Other non-interest income (non-customer related)	0	0	1	(1)
Noninterest Income	38	39	111	112
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other Service Charges, Commissions and Fees	19	18	54	53
Wealth Management and Trust Income	4	4	11	11
Brokerage Commissions Revenue	1	1	4	3
Total non-interest income from contracts with customers (ASC 606)	38	39	112	114
Other non-interest income (Non-ASC 606 customer related)	0	0	(2)	(1)
Interest Income (Expense), Net	177	165	516	475
Revenues	215	204	627	587
National Bank Of Arizona [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	3	3	9	10
Noninterest income, Customer-related Fees	9	9	26	27
Other non-interest income (non-customer related)	1	1	3	2
Noninterest Income	10	10	29	29
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other Service Charges, Commissions and Fees	3	4	9	9
Wealth Management and Trust Income	0	0	1	1
Brokerage Commissions Revenue	0	0	0	0
Total non-interest income from contracts with customers (ASC 606)	6	7	19	20
Other non-interest income (Non-ASC 606 customer related)	3	2	7	7
Interest Income (Expense), Net	59	53	170	152
Revenues	69	63	199	181
Nevada State Bank [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	4	4	10	11
Noninterest income, Customer-related Fees	10	10	30	29
Other non-interest income (non-customer related)	0	1	0	1
Noninterest Income	10	11	30	30
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other Service Charges, Commissions and Fees	3	3	9	9
Wealth Management and Trust Income	1	1	3	2
Brokerage Commissions Revenue	0	0	1	0
Total non-interest income from contracts with customers (ASC 606)	8	8	23	22
Other non-interest income (Non-ASC 606 customer related)	2	2	7	7
Interest Income (Expense), Net	38	33	111	96
Revenues	48	44	141	126
Vectra Bank Colorado [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	2	2	7	6
Noninterest income, Customer-related Fees	6	7	18	18
Other non-interest income (non-customer related)	0	0	0	1
Noninterest Income	6	7	18	19
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other Service Charges, Commissions and Fees	2	3	5	5
Wealth Management and Trust Income	0	0	1	1
Brokerage Commissions Revenue	0	0	0	1
Total non-interest income from contracts with customers (ASC 606)	4	5	13	13
Other non-interest income (Non-ASC 606 customer related)	2	2	5	5
Interest Income (Expense), Net	35	32	101	94
Revenues	41	39	119	113
Commerce Bank Of Washington [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	0	0	1	1
Noninterest income, Customer-related Fees	1	1	4	3
Other non-interest income (non-customer related)	0	0	0	0
Noninterest Income	1	1	4	3
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other Service Charges, Commissions and Fees	1	1	2	2
Wealth Management and Trust Income	0	0	0	0
Brokerage Commissions Revenue	0	0	0	0
Total non-interest income from contracts with customers (ASC 606)	1	1	3	3
Other non-interest income (Non-ASC 606 customer related)	0	0	1	0
Interest Income (Expense), Net	14	12	38	34
Revenues	15	13	42	37
Other Segment [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	1	1	1	0
Noninterest income, Customer-related Fees	11	9	32	24
Other non-interest income (non-customer related)	10	14	34	44
Noninterest Income	21	23	66	68
Gains (Losses) on Sales of Other Real Estate	0	0	1	1
Other Service Charges, Commissions and Fees	4	0	11	6
Wealth Management and Trust Income	3	3	11	7
Brokerage Commissions Revenue	2	2	4	4
Total non-interest income from contracts with customers (ASC 606)	10	6	27	17
Other non-interest income (Non-ASC 606 customer related)	1	3	5	7
Interest Income (Expense), Net	(29)	(15)	(66)	(27)
Revenues	(8)	8	1	42
Amegy Corporation [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	11	9	33	31
Noninterest income, Customer-related Fees	31	28	95	88
Other non-interest income (non-customer related)	0	0	0	(1)
Noninterest Income	31	28	95	87
Gains (Losses) on Sales of Other Real Estate	0	0	0	0
Other Service Charges, Commissions and Fees	9	9	28	28
Wealth Management and Trust Income	3	2	8	6
Brokerage Commissions Revenue	(1)	(1)	(4)	(4)
Total non-interest income from contracts with customers (ASC 606)	22	19	65	61
Other non-interest income (Non-ASC 606 customer related)	9	9	30	27
Interest Income (Expense), Net	133	122	385	360
Revenues	164	150	480	447
California Bank Trust [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	7	7	21	21
Noninterest income, Customer-related Fees	19	19	57	55
Other non-interest income (non-customer related)	0	1	2	1
Noninterest Income	19	20	59	56
Gains (Losses) on Sales of Other Real Estate	0	1	0	1
Other Service Charges, Commissions and Fees	6	6	18	18
Wealth Management and Trust Income	1	1	3	2
Brokerage Commissions Revenue	1	1	3	3
Total non-interest income from contracts with customers (ASC 606)	15	15	45	44
Other non-interest income (Non-ASC 606 customer related)	4	4	12	11
Interest Income (Expense), Net	138	120	399	355
Revenues	157	141	458	412
Consolidated Entities [Member]
Segment Reporting Information [Line Items]
Service Charges and Fees on Deposit Accounts	42	42	125	127
Noninterest income, Customer-related Fees	125	122	372	357
Other non-interest income (non-customer related)	11	17	40	47
Noninterest Income	136	139	412	404
Gains (Losses) on Sales of Other Real Estate	0	1	1	2
Other Service Charges, Commissions and Fees	47	44	136	130
Wealth Management and Trust Income	12	11	38	30
Brokerage Commissions Revenue	3	3	8	7
Total non-interest income from contracts with customers (ASC 606)	104	100	307	294
Other non-interest income (Non-ASC 606 customer related)	21	22	65	63
Interest Income (Expense), Net	565	522	1,654	1,539
Revenues	$ 701	$ 662	$ 2,067	$ 1,945

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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1	$ 2	$ 4	$ 5
Expected return on plan assets	(3)	(3)	(9)	(9)
Amortization of net actuarial (gain) loss	0	1	1	4
Net periodic benefit cost (credit)	(1)	1	(2)	2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ 1	$ 1	$ 2	$ 2

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Percent	23.60%	34.20%	22.90%	30.60%
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	$ 170		$ 170		$ 93

Net Earnings per Common Share_2

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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 223	$ 160	$ 658	$ 469
Dividends	66	32	170	89
Undistributed Earnings, Basic	157	128	488	380
Undistributed Earnings Applicable to Nonvested Shares	1	1	4	4
Undistributed Earnings (Loss) Available to Common Shareholders, Diluted	156	127	484	376
Distributed Earnings	$ 58	$ 24	$ 144	$ 56
Weighted Average Number of Shares Outstanding, Basic	192,973	200,332	195,079	201,493
Dilutive Effect of Common Stock Warrants	11,880	7,729	12,555	6,783
Dilutive Effect of Stock Options	912	1,045	1,023	1,090
Earnings Per Share, Basic	$ 1.11	$ 0.75	$ 3.22	$ 2.14
Net Income (Loss) Available to Common Stockholders, Diluted	$ 214	$ 151	$ 628	$ 432
Weighted Average Number of Shares Outstanding, Diluted	205,765	209,106	208,657	209,366
Earnings Per Share, Diluted	$ 1.04	$ 0.72	$ 3.01	$ 2.06

Net Earnings per Common Share_3

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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,490	1,779	1,651	1,997

Operating Segment Information_2

Operating Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018USD ($)Branches	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)Branches	Sep. 30, 2017USD ($)	Dec. 31, 2017USD ($)
Segment Reporting Information [Line Items]
Number of community regional banks operating in distinct geographical areas	7		7
Interest Income (Expense), Net	$ 565	$ 522	$ 1,654	$ 1,539
Provision for Loan and Lease Losses	(11)	5	(46)	35
Interest Income (Expense), after Provision for Loan Loss	576	517	1,700	1,504
Noninterest Income, Other Operating Income	1	3	7	3
Noninterest Expense	420	413	1,259	1,232
Income (Loss) from Continuing Operations before Income Taxes, Domestic	292	243	853	676
Investment Securities Gross Unrealized Losses Less Than 12 Months			156		$ 47
Investment Securities Estimated Fair Value Less Than 12 Months	7,291		7,291		5,642
Investment Securities Gross Unrealized Losses 12 Months or More			319		147
Investment Securities Estimated Fair Value 12 Months or More	6,955		6,955		6,714
Investment Securities Gross Unrealized Losses Total			475		194
Investment Securities Estimated Fair Value Total	14,246		14,246		12,356
Zions Bank [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	177	165	516	475
Provision for Loan and Lease Losses	2	(15)	3	18
Interest Income (Expense), after Provision for Loan Loss	175	180	513	457
Noninterest Income, Other Operating Income	38	39	111	112
Noninterest Expense	118	107	350	327
Income (Loss) from Continuing Operations before Income Taxes, Domestic	95	112	274	242
Average Loans And Leases	12,607	12,543	12,565	12,505
Average Deposits	15,845	15,773	15,847	16,001
Amegy Corporation [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	133	122	385	360
Provision for Loan and Lease Losses	(16)	33	(72)	41
Interest Income (Expense), after Provision for Loan Loss	149	89	457	319
Noninterest Income, Other Operating Income	31	28	95	87
Noninterest Expense	84	86	254	259
Income (Loss) from Continuing Operations before Income Taxes, Domestic	96	31	298	147
Average Loans And Leases	11,328	11,170	11,362	10,890
Average Deposits	11,185	10,862	11,022	11,131
National Bank Of Arizona [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	59	53	170	152
Provision for Loan and Lease Losses	(1)	(8)	8	(7)
Interest Income (Expense), after Provision for Loan Loss	60	61	162	159
Noninterest Income, Other Operating Income	10	10	29	29
Noninterest Expense	39	38	115	111
Income (Loss) from Continuing Operations before Income Taxes, Domestic	31	33	76	77
Average Loans And Leases	4,591	4,267	4,591	4,258
Average Deposits	5,008	4,816	4,912	4,747
Consolidated Entities [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	565	522	1,654	1,539
Provision for Loan and Lease Losses	(11)	5	(46)	35
Interest Income (Expense), after Provision for Loan Loss	576	517	1,700	1,504
Noninterest Income, Other Operating Income	136	139	412	404
Noninterest Expense	420	413	1,259	1,232
Income (Loss) from Continuing Operations before Income Taxes, Domestic	292	243	853	676
Average Loans And Leases	45,368	43,832	45,159	43,218
Average Deposits	53,575	51,921	52,827	52,155
Zions Bank [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	14	12	38	34
Provision for Loan and Lease Losses	0	3	2	2
Interest Income (Expense), after Provision for Loan Loss	14	9	36	32
Noninterest Income, Other Operating Income	1	1	4	3
Noninterest Expense	6	5	16	16
Income (Loss) from Continuing Operations before Income Taxes, Domestic	9	5	24	19
Average Loans And Leases	1,136	939	1,113	909
Average Deposits	1,086	1,098	1,069	1,098
California Bank Trust [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	138	120	399	355
Provision for Loan and Lease Losses	3	(4)	7	(10)
Interest Income (Expense), after Provision for Loan Loss	135	124	392	365
Noninterest Income, Other Operating Income	19	20	59	56
Noninterest Expense	77	74	231	225
Income (Loss) from Continuing Operations before Income Taxes, Domestic	77	70	220	196
Average Loans And Leases	9,985	9,575	9,941	9,453
Average Deposits	11,335	11,021	11,213	10,953
Nevada State Bank [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	38	33	111	96
Provision for Loan and Lease Losses	0	(3)	0	(8)
Interest Income (Expense), after Provision for Loan Loss	38	36	111	104
Noninterest Income, Other Operating Income	10	11	30	30
Noninterest Expense	35	35	108	105
Income (Loss) from Continuing Operations before Income Taxes, Domestic	13	12	33	29
Average Loans And Leases	2,408	2,347	2,369	2,352
Average Deposits	4,302	4,276	4,280	4,240
Vectra Bank Colorado [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	35	32	101	94
Provision for Loan and Lease Losses	1	0	5	0
Interest Income (Expense), after Provision for Loan Loss	34	32	96	94
Noninterest Income, Other Operating Income	6	7	18	19
Noninterest Expense	26	25	79	75
Income (Loss) from Continuing Operations before Income Taxes, Domestic	14	14	35	38
Average Loans And Leases	2,969	2,683	2,882	2,607
Average Deposits	2,789	2,757	2,762	2,758
Other Segment [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	(29)	(15)	(66)	(27)
Provision for Loan and Lease Losses	0	(1)	1	(1)
Interest Income (Expense), after Provision for Loan Loss	(29)	(14)	(67)	(26)
Noninterest Income, Other Operating Income	21	23	66	68
Noninterest Expense	35	43	106	114
Income (Loss) from Continuing Operations before Income Taxes, Domestic	(43)	(34)	(107)	(72)
Average Loans And Leases	344	308	336	244
Average Deposits	$ 2,025	1,318	$ 1,722	1,227
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 | Zions Bank [Member]
Segment Reporting Information [Line Items]
Number of Branches | Branches	1		1
OREGON | Zions Bank [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	90		90
Consolidated Entities [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	$ 565	$ 522	$ 1,654	$ 1,539
Available-for-sale Securities [Member]
Segment Reporting Information [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	152		152		44
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	7,064		7,064		5,379
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	302		302		137
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	6,612		6,612		6,422
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	454		454		181
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	13,676		13,676		11,801
US Treasury Securities [Member]
Segment Reporting Information [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	25		25
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0		0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	25		25
Agency Securities [Member]
Segment Reporting Information [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	20		20		6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	970		970		808
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	12		12		7
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	354		354		808
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	32		32		13
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,324		1,324		1,616
Agency Guaranteed Mortgage Backed Securities [Member]
Segment Reporting Information [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	92		92		29
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,821		3,821		3,609
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	249		249		112
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	5,354		5,354		4,721
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	341		341		141
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	9,175		9,175		8,330
Small Business Administration Loan Backed Securities [Member]
Segment Reporting Information [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	25		25		3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,414		1,414		408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	25		25		12
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	559		559		649
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	50		50		15
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,973		1,973		1,057
US States and Political Subdivisions Debt Securities [Member]
Segment Reporting Information [Line Items]
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	570		570		555
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	17		17		10
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4		4		3
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	227		227		263
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	343		343		292
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	21		21		13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	15		15		6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	834		834		554
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	15		15		5
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	331		331		230
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	30		30		11
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,165		1,165		784
Available-for-sale, Unrealized losses, Other [Member]
Segment Reporting Information [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0		0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0		0		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1		1		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	14		14		14
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	1		1		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 14		$ 14		$ 14