Fair Value Measurement and Election - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
LHFI at fair value	$ 379,000,000	[1]	$ 433,000,000	[1]
Allowance for Loan and Lease Losses, Write-offs	(1,907,000,000)		(2,241,000,000)		(3,018,000,000)
Loans sold at carrying value	4,800,000,000		725,000,000
Loans transferred from loans held for sale to loans	71,000,000		63,000,000		213,000,000
Valuation losses on affordable housing investments	96,000,000		10,000,000		15,000,000
Unfunded loan commitments and letters of credit	42,700,000,000
Allowance for unfunded loan commitments and letters of credit	49,000,000
Total Return Swap | Fair Value, Inputs, Level 2 [Member]
LHFI at fair value	1,900,000,000		1,700,000,000
Interest Rate Lock Commitments
Transferred Out of Level 3 in The Fair Value Hierarchy	(882,000,000)		(271,000,000)
Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Instrument, Fair Value Disclosure	286,000,000
Lower Limit
Probable Forecasted Sale of Years	6 years 6 months
Upper Limit
Probable Forecasted Sale of Years	7 years
Land Held For Sale [Member] | Fair Value, Inputs, Level 3 [Member]
Asset Impairment Charges	(7,000,000)		0
Asset-backed Securities [Member] | Student Loans [Member]
Government guaranteed percent	97.00%
Equity Securities, Coca Cola | Fair Value, Inputs, Level 3 [Member]
Derivative in a liability position, fair value			189,000,000
Trading Account Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Trading loans were outstanding	357,000,000		323,000,000
Residential Mortgage, Loans Held For Sale [Member] | Fair Value, Inputs, Level 2 [Member]
Recognized losses due to changes in fair value attributable to borrower-specific credit risk	12,000,000		(15,000,000)		(18,000,000)
Residential Mortgage, Loans Held For Sale [Member] | Nonperforming Financing Receivable [Member]
Transfer Of Portfolio Loans And Leases To Held For Sale Net Of Impairment	700,000,000		57,000,000
Allowance for Loan and Lease Losses, Write-offs	(199,000,000)		(10,000,000)
Loans sold at carrying value	486,000,000		34,000,000
Transfer Of Portfolio Loans And Leases To Held For Sale Net Of Impairment Remain in Held For Sale at Year End	6,000,000
Loans transferred from loans held for sale to loans	7,000,000		13,000,000
Other than Temporary Impairment Losses, Investments	2,000,000
Residential Mortgage | Nonperforming Financing Receivable [Member]
Incremental Charge-offs Recognized Due to Change in Policy	79,000,000
Collateralized Loan Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Recognized losses due to changes in fair value attributable to borrower-specific credit risk	10,000,000		(4,000,000)		21,000,000
Brokered Deposits | Fair Value, Inputs, Level 2 [Member]
Recognized gains (losses) on liabilities due to changes in its own credit spread	(15,000,000)		2,000,000		(41,000,000)
Long-term Debt [Member] | Fair Value, Inputs, Level 2 [Member]
Recognized gains (losses) on liabilities due to changes in its own credit spread	(78,000,000)		57,000,000		(95,000,000)
Repossessed Personal Property [Member] | Fair Value, Inputs, Level 2 [Member]
Asset Impairment Charges	(2,000,000)		(1,000,000)
Property Subject to Operating Lease [Member] | Fair Value, Inputs, Level 2 [Member]
Asset Impairment Charges	(2,000,000)		(5,000,000)
Community Development Investments [Member]
Transfer Of Portfolio Loans And Leases To Held For Sale Net Of Impairment	200,000,000
Valuation losses on affordable housing investments	96,000,000		10,000,000
Fair Value, Measurements, Recurring [Member]
Debt Instrument, Fair Value Disclosure	1,622,000,000		1,997,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Instrument, Fair Value Disclosure	$ 0		$ 0
Fair Value, Measurements, Recurring [Member] | Other real estate owned residential properties [Member] | Fair Value, Inputs, Level 3 [Member] | Lower Limit
Fair Value Inputs, Discount Rate, Variable Spread	15.00%
Fair Value, Measurements, Recurring [Member] | Other real estate owned residential properties [Member] | Fair Value, Inputs, Level 3 [Member] | Upper Limit
Fair Value Inputs, Discount Rate, Variable Spread	50.00%
Fair Value, Measurements, Recurring [Member] | Other real estate owned residential properties [Member] | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member]
Fair Value Inputs, Discount Rate, Variable Spread	22.00%
Fair Value, Measurements, Recurring [Member] | Other real estate owned commercial properties [Member] | Fair Value, Inputs, Level 3 [Member] | Lower Limit
Fair Value Inputs, Discount Rate, Variable Spread	10.00%
Fair Value, Measurements, Recurring [Member] | Other real estate owned commercial properties [Member] | Fair Value, Inputs, Level 3 [Member] | Upper Limit
Fair Value Inputs, Discount Rate, Variable Spread	35.00%
Fair Value, Measurements, Recurring [Member] | Other real estate owned commercial properties [Member] | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member]
Fair Value Inputs, Discount Rate, Variable Spread	23.00%

[1] 2 Includes loans of consolidated VIEs365 3,322