Certain Transfers of Financial Assets and Variable Interest Entities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Total assets	$ 175,335		$ 173,442
Loans Receivable Held-for-sale, Net	1,699	[1]	3,399	[1]
Long-term Debt	10,700	[2]	9,357	[2]
Total liabilities	153,913		152,457
Trading assets	5,040		6,227
Derivative Asset, Fair Value, Gross Asset	6,125		8,656
Derivative Liability, Fair Value, Gross Liability	5,673		7,514
Other Assets	5,520		5,157
Noninterest Income	3,214		5,373		3,421
Affordable Housing Investment [Member]
Gain (Loss) on Sale of Properties	17
Variable Interest Entity, Primary Beneficiary [Member]
Loans Receivable Held-for-sale, Net			319
Long-term Debt	597		666
Residential Mortgage | Variable Interest Entity, Not Primary Beneficiary [Member]
Loans and Leases Receivable, Gain (Loss) on Sales, Net	186		1,000		397
Transferor's Interests in Transferred Financial Assets, Fair Value	71		98
Total assets	350		445
Commercial and Corporate Loans [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Total assets	1,600		1,800
Total liabilities	1,600		1,700
Commercial and Corporate Loans [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Preference Shares
Total assets	3		3
Commercial and Corporate Loans [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Long-term Debt	256		286
Student Loans [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Long-term Debt	341		380
Loans Receivable, Net	344		384
Student Loans [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Maximum [Member]
Government guaranteed percent	97.00%		97.00%
Collateralized Debt Obligations [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Total assets	816		1,200
Collateralized Debt Obligations [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Trading Assets [Member]
Transferor's Interests in Transferred Financial Assets, Fair Value	54		52
CDO Securities Weighted Average Expected Maturity in Years	20
Collateralized Debt Obligations [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Minimum [Member]
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Other Assumption	4
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Other Assumption	7
Collateralized Debt Obligations [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Minimum [Member] | Trading Assets [Member]
Fair Value Inputs, Market Yield	4.30%
Collateralized Debt Obligations [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Maximum [Member] | Trading Assets [Member]
Fair Value Inputs, Market Yield	5.50%
Total Return Swap | Variable Interest Entity, Not Primary Beneficiary [Member]
Trading assets	1,500		1,900
Derivative, Notional Amount	1,500		1,900
Derivative Asset, Fair Value, Gross Asset	35		51
Derivative Liability, Fair Value, Gross Liability	31		46
Community Development Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Total assets	1,500		1,200
Other Assets	138		63
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	217		110
Ridgeworth Capital Management [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Total assets	247		372
General Partner [Member] | Community Development Investments [Member]
Total assets	3		3
Total liabilities	1		1
Limited Partner [Member] | Community Development Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Other Assets	252		186
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	697		505
Loans issued by the Company to the limited partnerships	303		236
Partnership [Member] | Community Development Investments [Member]
Total assets	151		239
Total liabilities	$ 58		$ 100

[1] 1 Includes loans held for sale, at fair value, of consolidated VIEs of $261 million and $319 million at December 31, 2013 and 2012, respectively.

[2] 3 Includes debt of consolidated VIEs of $597 million and $666 million at December 31, 2013 and 2012, respectively, of which $256 and $286 are carried at fair value at December 31, 2013 and 2012, respectively.