Certain Transfers of Financial Assets and Variable Interest Entities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2013
Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other			$ 12	$ 7		$ 19	$ 10
Total assets	182,559			182,559				175,335
Loans Receivable Held-for-sale, Net	4,046	[1],[2]		4,046	[1],[2]			1,699	[1],[2]
Long-term Debt	13,155	[3]		13,155	[3]			10,700	[3]
Total liabilities	160,428			160,428				153,913
Trading assets	5,141			5,141				5,040
Derivative Asset, Fair Value, Gross Asset	5,577			5,577				6,125
Derivative Liability, Fair Value, Gross Liability	5,225			5,225				5,673
Other Assets	5,489			5,489				5,520
Investment Tax Credit	15		15	30		29
Noninterest Income	957		858	1,748		1,721
Affordable Housing Investment [Member]
Disclosure of Long Lived Assets Held-for-sale [Table Text Block]	65
Variable Interest Entity, Primary Beneficiary [Member]
Long-term Debt	322			322				597
Residential Mortgage [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Loans and Leases Receivable, Gain (Loss) on Sales, Net	61		124	105		281
Transferor's Interests in Transferred Financial Assets, Fair Value	65			65				71
Total assets	316			316				350
Commercial and Corporate Loans [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Total assets	800			800				1,600
Total liabilities	700			700				1,600
Commercial and Corporate Loans [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Preference Shares [Member]
Total assets	5			5				3
Commercial and Corporate Loans [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Senior Subordinated Notes [Member]
Total assets	22			22				26
Commercial and Corporate Loans [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Long-term Debt								256
Student Loans [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Long-term Debt	322			322				341
Loans Receivable, Net	326			326				344
Student Loans [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Maximum [Member]
Government guaranteed percent	97.00%			97.00%				97.00%
Total Return Swap | Variable Interest Entity, Not Primary Beneficiary [Member]
Trading assets	1,400			1,400				1,500
Derivative, Notional Amount	1,400			1,400				1,500
Derivative Asset, Fair Value, Gross Asset	19			19				35
Derivative Liability, Fair Value, Gross Liability	16			16				31
Community Development Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Total assets	1,500			1,500				1,500
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	234			234				217
Real Estate Variable Interest Entity Borrowings	145			145				138
Limited Partner [Member] | Community Development Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Other Assets	270			270				252
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	766			766				697
Loans issued by the Company to the limited partnerships	346			346				303
Partnership [Member] | Community Development Investments [Member]
Total assets	108			108				151
Total liabilities	56			56				58
provision for income taxes [Member]
Other Depreciation and Amortization	14		10	27		20
Portion at Fair Value Measurement [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Loans Receivable Held-for-sale, Net	0			0				261
Residential Mortgage [Member]
Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other	$ 7		$ 11	$ 10	[4],[5]	$ 17

[1] Includes $1.4 billion of LHFS carried at fair value at both June 30, 2014 and December 31, 2013.

[2] Includes loans held for sale, at fair value, of consolidated VIEs of $0 million and $261 million at June 30, 2014 and December 31, 2013, respectively.

[3] Includes debt of consolidated VIEs of $322 million and $597 million at June 30, 2014 and December 31, 2013, respectively, of which $0 million and $256 million are carried at fair value at June 30, 2014 and December 31, 2013, respectively.

[4] Does not include GSE mortgage loan transfers

[5] The transfer activity is related to unconsolidated VIEs.