Fair Value Measurement and Election - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Transfer of Loans Held-for-sale to Portfolio Loans	$ 43,000,000	$ 71,000,000	$ 63,000,000
Loans Receivable, Fair Value Disclosure	302,000,000	379,000,000
Allowance for Loan and Lease Losses, Write-offs	(869,000,000)	(1,907,000,000)	(2,241,000,000)
Loans held for investment sold	807,000,000	4,800,000,000
Gain (Loss) on Sales of Loans, Net	1,000,000	(3,000,000)
Unfunded loan commitments and letters of credit	48,900,000,000	42,700,000,000
Allowance for unfunded loan commitments and letters of credit	53,000,000	49,000,000
Total Return Swap | Fair Value, Inputs, Level 2 [Member]
Loans Receivable, Fair Value Disclosure	1,500,000,000	1,900,000,000
Interest Rate Lock Commitments
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	222,000,000	882,000,000
Asset-backed Securities [Member] | Student Loans [Member]
Government guaranteed percent	97.00%	97.00%
Trading Account Assets [Member] | Commercial and Corporate Leveraged Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Loans Receivable, Fair Value Disclosure	313,000,000	357,000,000
Fair Value, Option, Credit Risk, Gains (Losses) on Assets	5,000,000	3,000,000	(3,000,000)
Residential Mortgage, Loans Held For Sale [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Option, Credit Risk, Gains (Losses) on Assets	(2,000,000)	12,000,000	15,000,000
Residential Mortgage, Loans Held For Sale [Member] | Nonperforming Financing Receivable [Member]
Other than Temporary Impairment Losses, Investments		2,000,000
Loans held for investment sold		486,000,000
Collateralized Loan Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Option, Credit Risk, Gains (Losses) on Assets	1,000,000	10,000,000	(4,000,000)
Brokered Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Option, Credit Risk, Gains (Losses) on Liabilities	(3,000,000)	(15,000,000)	2,000,000
Long-term Debt [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Option, Credit Risk, Gains (Losses) on Liabilities	(40,000,000)	78,000,000	57,000,000
Loans Held For Sale [Member] | Nonperforming Financing Receivable [Member]
Transfer Of Portfolio Loans And Leases To Held For Sale Net Of Impairment	25,000,000	700,000,000
Loans Held For Sale [Member] | Residential Portfolio Segment [Member]
Loans sold at carrying value	63,000,000
Gain (Loss) on Sales of Loans, Net	12,000,000
Loans Held For Sale [Member] | Nonperforming Residential Mortgages Transferred To Held For Sale During Period [Member]
Transfer of Loans Held-for-sale to Portfolio Loans		7,000,000
Allowance for Loan and Lease Losses, Write-offs	(3,000,000)	(199,000,000)
Net Carrying Value of Loans Held For Sale, Portion Remaining in Held For Sale at Period End		6,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Loans Receivable, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Loans Receivable, Fair Value Disclosure	302,000,000	379,000,000
Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Instrument, Fair Value Disclosure	256,000,000
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member]
Asset Impairment Charges	10,000,000	48,000,000
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets Re-valued Using Pooled Approach, Percentage	11.00%
Other real estate owned residential properties [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Discount Rate, Variable Spread	10.00%
Other real estate owned residential properties [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Discount Rate, Variable Spread	60.00%
Other real estate owned residential properties [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Discount Rate, Variable Spread	29.00%
Other Assets [Member] | Fair Value, Measurements, Nonrecurring [Member]
Asset Impairment Charges	61,000,000	13,000,000
Other Assets [Member] | Fair Value, Measurements, Nonrecurring [Member] | Repossessed Personal Property [Member]
Asset Impairment Charges	19,000,000	2,000,000
Other Assets [Member] | Fair Value, Measurements, Nonrecurring [Member] | Land [Member]
Asset Impairment Charges	0	7,000,000
Other Assets [Member] | Fair Value, Measurements, Nonrecurring [Member] | Property Subject to Operating Lease [Member]
Asset Impairment Charges	31,000,000	2,000,000
Other Assets [Member] | Fair Value, Measurements, Nonrecurring [Member] | Private Equity Partnership Investments [Member]
Asset Impairment Charges	11,000,000	0
Affordable Housing [Member] | Fair Value, Measurements, Nonrecurring [Member]
Asset Impairment Charges	$ 3,000,000	$ 96,000,000
Other real estate owned commercial properties [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Discount Rate, Variable Spread	5.00%
Other real estate owned commercial properties [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Discount Rate, Variable Spread	45.00%
Other real estate owned commercial properties [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Discount Rate, Variable Spread	24.00%