Notional Amounts and Fair Values for All Derivative Instruments Included in the Consolidated Balance Sheets (Detail) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Derivatives, Fair Value [Line Items]
Fair value - Derivative Assets	$ 1,964	$ 2,074	$ 2,331
Fair value - Derivative Liabilities	1,157	1,314	1,368
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Fair value - Derivative Assets	593	607	769
Fair value - Derivative Liabilities	27	31	31
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Fair Value Hedging
Derivatives, Fair Value [Line Items]
Fair value - Derivative Assets	422	442	559
Fair value - Derivative Liabilities			1
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Fair Value Hedging | Interest Rate Swap | Long-Term Debt
Derivatives, Fair Value [Line Items]
Notional amount	4,080	4,355	4,355
Fair value - Derivative Assets	422	442	559
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Fair Value Hedging | Interest Rate Swap | Bank Time Deposits
Derivatives, Fair Value [Line Items]
Notional amount			296
Fair value - Derivative Liabilities			1
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Fair value - Derivative Assets	171	165	210
Fair value - Derivative Liabilities	27	31	30
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Cash Flow Hedging | Interest Rate Swap | Long-Term Debt
Derivatives, Fair Value [Line Items]
Notional amount	250	1,190	907
Fair value - Derivative Liabilities	9	31	20
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Cash Flow Hedging | Interest Rate Swap | Commercial and Industrial Loans
Derivatives, Fair Value [Line Items]
Notional amount	2,000	3,000	3,500
Fair value - Derivative Assets	42	8	26
Fair value - Derivative Liabilities	18		10
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Cash Flow Hedging | Interest Rate Floor | Commercial and Industrial Loans
Derivatives, Fair Value [Line Items]
Notional amount	1,500	1,500	1,500
Fair value - Derivative Assets	128	153	171
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Cash Flow Hedging | Interest Rate Cap | Long-Term Debt
Derivatives, Fair Value [Line Items]
Notional amount	1,500	1,500	2,500
Fair value - Derivative Assets	1	4	13
Nondesignated
Derivatives, Fair Value [Line Items]
Fair value - Derivative Assets	1,371	1,467	1,562
Fair value - Derivative Liabilities	1,130	1,283	1,337
Nondesignated | Risk Management and Other Business Purposes
Derivatives, Fair Value [Line Items]
Fair value - Derivative Assets	310	317	359
Fair value - Derivative Liabilities	67	126	147
Nondesignated | Risk Management and Other Business Purposes | Interest Rate Swap | Long-Term Debt
Derivatives, Fair Value [Line Items]
Notional amount	373	173	304
Fair value - Derivative Assets	2	3	4
Fair value - Derivative Liabilities	6	1	1
Nondesignated | Risk Management and Other Business Purposes | Interest Rate Contract | Mortgage Servicing Rights
Derivatives, Fair Value [Line Items]
Notional amount	16,452	12,477	7,557
Fair value - Derivative Assets	196	141	236
Fair value - Derivative Liabilities	31	81	7
Nondesignated | Risk Management and Other Business Purposes | Forward Contracts | Assets Held-for-sale
Derivatives, Fair Value [Line Items]
Notional amount	2,210	6,389	2,707
Fair value - Derivative Assets	6	90
Fair value - Derivative Liabilities	9	14	50
Nondesignated | Risk Management and Other Business Purposes | Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Notional amount	1,681	2,494	6,919
Fair value - Derivative Assets	2	4	37
Fair value - Derivative Liabilities	2	4	37
Nondesignated | Risk Management and Other Business Purposes | Put Option
Derivatives, Fair Value [Line Items]
Notional amount	901	769	759
Fair value - Derivative Liabilities	7	8	9
Nondesignated | Risk Management and Other Business Purposes | Warrant
Derivatives, Fair Value [Line Items]
Notional amount	205	175	173
Fair value - Derivative Assets	104	79	82
Nondesignated | Risk Management and Other Business Purposes | Swap
Derivatives, Fair Value [Line Items]
Notional amount	416	363	397
Fair value - Derivative Liabilities	12	18	43
Nondesignated | Customer Accommodation
Derivatives, Fair Value [Line Items]
Fair value - Derivative Assets	1,061	1,150	1,203
Fair value - Derivative Liabilities	1,063	1,157	1,190
Nondesignated | Customer Accommodation | Interest Rate Contract
Derivatives, Fair Value [Line Items]
Notional amount	28,607	26,817	26,890
Fair value - Derivative Assets	675	701	828
Fair value - Derivative Liabilities	700	735	870
Nondesignated | Customer Accommodation | Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Notional amount	20,848	17,998	13,453
Fair value - Derivative Assets	293	339	270
Fair value - Derivative Liabilities	281	319	245
Nondesignated | Customer Accommodation | Interest Rate Lock Commitments
Derivatives, Fair Value [Line Items]
Notional amount	1,729	1,772	2,416
Fair value - Derivative Assets	6	9	22
Fair value - Derivative Liabilities	2	9	1
Nondesignated | Customer Accommodation | Commodity Contract
Derivatives, Fair Value [Line Items]
Notional amount	1,939	1,878	1,203
Fair value - Derivative Assets	85	99	81
Fair value - Derivative Liabilities	78	92	72
Nondesignated | Customer Accommodation | Derivative | Certificates of Deposit
Derivatives, Fair Value [Line Items]
Notional amount	42	70	113
Fair value - Derivative Assets	2	2	2
Fair value - Derivative Liabilities	$ 2	$ 2	$ 2