Consolidated Balance Sheet (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash and Due from Banks	$ 4,074.8us-gaap_CashAndDueFromBanks	$ 3,050.6us-gaap_CashAndDueFromBanks
Federal Funds Sold and Securities Purchased under Agreements to Resell	1,113.9	1,062.7
Interest-Bearing Deposits with Banks	15,432.3us-gaap_InterestBearingDepositsInBanks	14,928.3us-gaap_InterestBearingDepositsInBanks
Federal Reserve Deposits	8,804.2us-gaap_FederalReserveBankStock	17,386.3us-gaap_FederalReserveBankStock
Securities
Available for Sale	30,945.7us-gaap_AvailableForSaleSecurities	29,558.5us-gaap_AvailableForSaleSecurities
Held to Maturity (Fair value of $5,665.0 and $4,176.1)	5,655.8us-gaap_HeldToMaturitySecurities	4,170.8us-gaap_HeldToMaturitySecurities
Trading Account	1.4us-gaap_TradingSecurities	4.7us-gaap_TradingSecurities
Total Securities	36,602.9us-gaap_MarketableSecurities	33,734.0us-gaap_MarketableSecurities
Loans and Leases
Commercial	15,491.3	14,353.6
Personal	17,138.9	17,286.6
Total Loans and Leases	32,630.2	31,640.2
Allowance for Credit Losses Assigned to Loans and Leases	(259.0)	(267.0)
Buildings and Equipment	442.4us-gaap_PropertyPlantAndEquipmentNet	444.3us-gaap_PropertyPlantAndEquipmentNet
Client Security Settlement Receivables	2,219.3	1,568.8
Goodwill	527.3us-gaap_Goodwill	533.2us-gaap_Goodwill
Other Assets	5,363.7us-gaap_OtherAssets	5,865.1us-gaap_OtherAssets
Total Assets	106,952.0us-gaap_Assets	109,946.5us-gaap_Assets
Deposits
Demand and Other Noninterest-Bearing	20,816.6	22,815.0
Savings and Money Market	15,892.2us-gaap_DepositsSavingsDeposits	15,916.4us-gaap_DepositsSavingsDeposits
Savings Certificates and Other Time	1,777.9us-gaap_TimeDeposits	1,757.4us-gaap_TimeDeposits
Non U.S. Offices - Noninterest-Bearing	2,307.6	2,723.2
Non U.S. Offices - Interest-Bearing	45,942.2	47,545.0
Total Deposits	86,736.5us-gaap_Deposits	90,757.0us-gaap_Deposits
Federal Funds Purchased	410.7us-gaap_FederalFundsPurchased	932.9us-gaap_FederalFundsPurchased
Securities Sold under Agreements to Repurchase	613.2	885.1
Other Borrowings	2,874.1us-gaap_OtherBorrowings	1,685.2us-gaap_OtherBorrowings
Senior Notes	1,497.1us-gaap_SeniorNotes	1,497.0us-gaap_SeniorNotes
Long-Term Debt	1,399.1us-gaap_OtherLongTermDebt	1,615.1us-gaap_OtherLongTermDebt
Floating Rate Capital Debt	277.2ntrs_TrustPreferredSecurities	277.2ntrs_TrustPreferredSecurities
Other Liabilities	4,536.5us-gaap_OtherLiabilities	3,848.1us-gaap_OtherLiabilities
Total Liabilities	98,344.4us-gaap_Liabilities	101,497.6us-gaap_Liabilities
Stockholders' Equity
Preferred Stock, No Par Value; Authorized 10,000,000 shares: Series C, outstanding shares of 16,000	388.5us-gaap_PreferredStockValue	388.5us-gaap_PreferredStockValue
Common Stock, $1.66 2/3 Par Value; Authorized 560,000,000 shares; Outstanding shares of 233,368,512 and 233,390,705	408.6us-gaap_CommonStockValue	408.6us-gaap_CommonStockValue
Additional Paid-In Capital	1,024.9us-gaap_AdditionalPaidInCapital	1,050.9us-gaap_AdditionalPaidInCapital
Retained Earnings	7,771.7	7,625.4
Accumulated Other Comprehensive Loss	(266.4)	(319.7)
Treasury Stock (11,803,012 and 11,780,819 shares, at cost)	(719.7)us-gaap_TreasuryStockValue	(704.8)us-gaap_TreasuryStockValue
Total Stockholders' Equity	8,607.6us-gaap_StockholdersEquity	8,448.9us-gaap_StockholdersEquity
Total Liabilities and Stockholders' Equity	$ 106,952.0	$ 109,946.5

Other collection items presented on behalf of custody clients.

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Amount of floating rate capital debt held by the company that have an unconditional obligation requiring the issuer to redeem the securities by transferring the assets at a specified or determinable date (or dates) or upon an event that is certain to occur. The debt was issued by a business trust to outside investors where the trust uses the proceeds of the issuance of those securities to purchase, from the financial institution that established the trust, an equivalent amount of junior subordinated debentures or other loans having stated maturities. The floating rate capital debt must be redeemed upon maturity of the debentures or other loans.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs).

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Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank.

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Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Amount of foreign interest-bearing deposits held by the entity.

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Amount before allowance of consumer loans, including, but not limited to, mortgage, home equity, vehicles, credit card, installment, and lease financing. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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Amount of domestic noninterest-bearing deposits held by the entity, which may include demand deposits, checking, brokered and retail deposits.

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Amount of foreign noninterest-bearing deposits held by the entity which may include demand deposits, checking, brokered and retail deposits.

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Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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