Fair Value Measurements - Fair Value Disclosures of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
ASSETS
Trading account assets	$ 789us-gaap_TradingSecurities	$ 750us-gaap_TradingSecurities		$ 840us-gaap_TradingSecurities
Securities available for sale	13,120us-gaap_AvailableForSaleSecurities	13,360us-gaap_AvailableForSaleSecurities		12,359us-gaap_AvailableForSaleSecurities
Held-to-maturity securities	5,003	4,974		4,733
Held-to-maturity securities	5,005us-gaap_HeldToMaturitySecurities	5,015us-gaap_HeldToMaturitySecurities		4,826us-gaap_HeldToMaturitySecurities
Other investments	730us-gaap_OtherShortTermInvestments	760us-gaap_OtherShortTermInvestments		899us-gaap_OtherShortTermInvestments
Loans, net of allowance	187	191		143
Loans, net of allowance	57,159	56,587		54,611
Loans held for sale	0	0		0
Loans held for sale	1,649us-gaap_LoansReceivableHeldForSaleNet	734us-gaap_LoansReceivableHeldForSaleNet	784us-gaap_LoansReceivableHeldForSaleNet	401us-gaap_LoansReceivableHeldForSaleNet	611us-gaap_LoansReceivableHeldForSaleNet
Derivative assets	731us-gaap_DerivativeAssets	609us-gaap_DerivativeAssets		427us-gaap_DerivativeAssets
LIABILITIES
Long-term debt	8,713us-gaap_LongTermDebt	7,875us-gaap_LongTermDebt		7,712us-gaap_LongTermDebt
Derivative liabilities	825us-gaap_DerivativeLiabilities	784us-gaap_DerivativeLiabilities		408us-gaap_DerivativeLiabilities
Carrying Amount [Member]
ASSETS
Cash and short-term investments	3,884	4,922		3,331
Trading account assets	789	750		840
Securities available for sale	13,120	13,360		12,359
Held-to-maturity securities	5,005	5,015		4,826
Other investments	730	760		899
Loans, net of allowance	57,159	56,587		54,611
Loans held for sale	1,649	734		401
Derivative assets	731	609		427
LIABILITIES
Deposits with no stated maturity	65,984	66,135		60,130
Time deposits	5,638	5,863		7,136
Short-term borrowings	1,125	998		1,181
Long-term debt	8,713	7,875		7,712
Derivative liabilities	825	784		408
Fair Value [Member]
ASSETS
Cash and short-term investments	3,884	4,922		3,331
Trading account assets	789	750		840
Securities available for sale	13,120	13,360		12,359
Held-to-maturity securities	5,003	4,974		4,733
Other investments	730	760		899
Loans, net of allowance	55,702	54,993		53,211
Loans held for sale	1,649	734		401
Derivative assets	731	609		427
LIABILITIES
Deposits with no stated maturity	65,984	66,135		60,130
Time deposits	5,698	5,925		7,216
Short-term borrowings	1,125	998		1,181
Long-term debt	9,108	8,251		8,069
Derivative liabilities	825	784		408
Fair Value [Member] \| Level 1 [Member]
ASSETS
Cash and short-term investments	3,884	4,922		3,331
Trading account assets	5	2		4
Securities available for sale	23	22		21
Other investments	1	2
Derivative assets	164	91		51
LIABILITIES
Time deposits	488	564		617
Short-term borrowings				3
Long-term debt	8,559	7,625		7,610
Derivative liabilities	138	77		43
Fair Value [Member] \| Level 2 [Member]
ASSETS
Trading account assets	784	748		836
Securities available for sale	13,087	13,328		12,338
Held-to-maturity securities	5,003	4,974		4,733
Other investments	346	344		335
Derivative assets	1,625	1,536		1,063
LIABILITIES
Deposits with no stated maturity	65,984	66,135		60,130
Time deposits	5,210	5,361		6,599
Short-term borrowings	1,125	998		1,178
Long-term debt	549	626		459
Derivative liabilities	1,274	1,248		812
Fair Value [Member] \| Level 3 [Member]
ASSETS
Securities available for sale	10	10
Other investments	383	414		564
Loans, net of allowance	55,702	54,993		53,211
Loans held for sale	1,649	734		401
Derivative assets	13	16		26
LIABILITIES
Derivative liabilities	1	1		1
Fair Value [Member] \| Netting Adjustment [Member]
ASSETS
Derivative assets	(1,071)
Derivative assets, netting adjustment		(1,034)		(713)
LIABILITIES
Derivative liabilities	(588)
Derivative liabilities, netting adjustment		(542)		(448)
Derivative liabilities, netting adjustment		$ (542)		$ (448)

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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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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-Section 03

-Paragraph 12

-Article 9

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.4)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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