Fair Value Measurements - Fair Value Disclosures of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Trading account assets	$ 750us-gaap_TradingSecurities	$ 738us-gaap_TradingSecurities
Securities available for sale	13,360us-gaap_AvailableForSaleSecurities	12,346us-gaap_AvailableForSaleSecurities
Held-to-maturity securities	4,974	4,617
Held-to-maturity securities	5,015us-gaap_HeldToMaturitySecurities	4,756us-gaap_HeldToMaturitySecurities
Other investments	760us-gaap_OtherShortTermInvestments	969us-gaap_OtherShortTermInvestments
Loans, net of allowance	191	147
Loans, net of allowance	56,587	53,609
Loans held for sale	0	0
Loans held for sale	734us-gaap_LoansReceivableHeldForSaleNet	611us-gaap_LoansReceivableHeldForSaleNet	599us-gaap_LoansReceivableHeldForSaleNet
Derivative assets	609us-gaap_DerivativeAssets	407us-gaap_DerivativeAssets
LIABILITIES
Long-term debt	7,875us-gaap_LongTermDebt	7,650us-gaap_LongTermDebt
Derivative liabilities	784us-gaap_DerivativeLiabilities	414us-gaap_DerivativeLiabilities
Carrying Amount [Member]
ASSETS
Cash and short-term investments	4,922	6,207
Trading account assets	750	738
Securities available for sale	13,360	12,346
Held-to-maturity securities	5,015	4,756
Other investments	760	969
Loans, net of allowance	56,587	53,609
Loans held for sale	734	611
Mortgage servicing assets	323	332
Derivative assets	609	407
LIABILITIES
Deposits with no stated maturity	66,135	62,425
Time deposits	5,863	6,837
Short-term borrowings	998	1,877
Long-term debt	7,875	7,650
Derivative liabilities	784	414
Fair Value [Member]
ASSETS
Cash and short-term investments	4,922	6,207
Trading account assets	750	738
Securities available for sale	13,360	12,346
Held-to-maturity securities	4,974	4,617
Other investments	760	969
Loans, net of allowance	54,993	52,102
Loans held for sale	734	611
Mortgage servicing assets	417	386
Derivative assets	609	407
LIABILITIES
Deposits with no stated maturity	66,135	62,425
Time deposits	5,925	6,926
Short-term borrowings	998	1,877
Long-term debt	8,251	8,008
Derivative liabilities	784	414
Fair Value [Member] \| Level 1 [Member]
ASSETS
Cash and short-term investments	4,922	6,207
Trading account assets	2	4
Securities available for sale	22	20
Other investments	2
Derivative assets	91	56
LIABILITIES
Time deposits	564	558
Short-term borrowings		2
Long-term debt	7,625	7,611
Derivative liabilities	77	49
Fair Value [Member] \| Level 2 [Member]
ASSETS
Trading account assets	748	734
Securities available for sale	13,328	12,326
Held-to-maturity securities	4,974	4,617
Other investments	344	392
Derivative assets	1,536	1,134
LIABILITIES
Deposits with no stated maturity	66,135	62,425
Time deposits	5,361	6,368
Short-term borrowings	998	1,875
Long-term debt	626	397
Derivative liabilities	1,248	864
Fair Value [Member] \| Level 3 [Member]
ASSETS
Securities available for sale	10
Other investments	414	577
Loans, net of allowance	54,993	52,102
Loans held for sale	734	611
Mortgage servicing assets	417	386
Derivative assets	16	29
LIABILITIES
Derivative liabilities	1	1
Fair Value [Member] \| Netting Adjustment [Member]
ASSETS
Derivative assets, netting adjustment	(1,034)	(812)
LIABILITIES
Derivative liabilities, netting adjustment	$ (542)	$ (500)

Deposits with no stated maturity.

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

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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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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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Fair value of investments in debt securities classified as held-to-maturity.

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Aggregation of the liabilities reported on the balance sheet measured at fair value on a nonrecurring basis by the entity.

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Amount after allowance and 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 and loans held for sale.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Amount classified as loans attributable to disposal group held for sale or disposed of. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Other investments not otherwise specified in the taxonomy that will be realized in a short period of time, usually less than one year or the normal operating cycle, whichever is longer.

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Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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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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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

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-Topic 942

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