Payment Status for the LHFI Portfolio (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	$ 129,540		$ 124,733
Accruing 30-89 Days Past Due	783		945
Accruing 90+ Days Past Due	1,066		1,228
Nonaccruing	762	[1],[2]	971	[1],[3]
Total	132,151	[4]	127,877	[4]
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	70,807		63,985
Accruing 30-89 Days Past Due	55		53
Accruing 90+ Days Past Due	13		25
Nonaccruing	219	[2]	247	[3]
Total	71,094		64,310
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	38,009		41,563
Accruing 30-89 Days Past Due	245		331
Accruing 90+ Days Past Due	433		584
Nonaccruing	535	[2]	712	[3]
Total	39,222		43,190
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	20,724		19,185
Accruing 30-89 Days Past Due	483		561
Accruing 90+ Days Past Due	620		619
Nonaccruing	8	[2]	12	[3]
Total	21,835		20,377
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	62,903		57,713
Accruing 30-89 Days Past Due	47		47
Accruing 90+ Days Past Due	12		18
Nonaccruing	178	[2]	196	[3]
Total	63,140		57,974
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	6,666		5,430
Accruing 30-89 Days Past Due	5		5
Accruing 90+ Days Past Due	1		7
Nonaccruing	32	[2]	39	[3]
Total	6,704		5,481
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,704		5,481
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	1,238		842
Accruing 30-89 Days Past Due	3		1
Accruing 90+ Days Past Due	0		0
Nonaccruing	9	[2]	12	[3]
Total	1,250		855
Residential Guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	197		2,787
Accruing 30-89 Days Past Due	34		58
Accruing 90+ Days Past Due	420		571
Nonaccruing	0		0
Total	651		3,416
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	23,274	[5]	23,808	[6]
Accruing 30-89 Days Past Due	105	[5]	150	[6]
Accruing 90+ Days Past Due	12	[5]	13	[6]
Nonaccruing	327	[2],[5]	441	[3],[6]
Total	23,718	[5],[7],[8]	24,412	[6],[7],[8]
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	14,109		14,480
Accruing 30-89 Days Past Due	101		119
Accruing 90+ Days Past Due	1		0
Nonaccruing	178	[2]	210	[3]
Total	14,389	[7]	14,809	[7]
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	429		488
Accruing 30-89 Days Past Due	5		4
Accruing 90+ Days Past Due	0		0
Nonaccruing	30	[2]	61	[3]
Total	464	[7]	553	[7]
Federally Guaranteed Student Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	4,338		4,475
Accruing 30-89 Days Past Due	365		461
Accruing 90+ Days Past Due	611		609
Nonaccruing	0		0
Total	5,314		5,545
Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	4,078		2,803
Accruing 30-89 Days Past Due	25		18
Accruing 90+ Days Past Due	2		3
Nonaccruing	5	[2]	5	[3]
Total	4,110	[9]	2,829	[9]
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	11,504		11,189
Accruing 30-89 Days Past Due	86		75
Accruing 90+ Days Past Due	1		1
Nonaccruing	3	[2]	7	[3]
Total	11,594	[9]	11,272	[9]
Consumer Credit Card Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	804		718
Accruing 30-89 Days Past Due	7		7
Accruing 90+ Days Past Due	6		6
Nonaccruing	0		0
Total	$ 817	[9]	$ 731	[9]

[1] Nonaccruing restructured loans are included in total nonaccrual/NPLs.

[2] Nonaccruing loans past due 90 days or more totaled $468 million. Nonaccruing loans past due fewer than 90 days include modified nonaccrual loans reported as TDRs and performing second lien loans which are classified as nonaccrual when the first lien loan is nonperforming.

[3] Nonaccruing loans past due 90 days or more totaled $653 million. Nonaccruing loans past due fewer than 90 days include modified nonaccrual loans reported as TDRs and performing second lien loans which are classified as nonaccrual when the first lien loan is nonperforming.

[4] Includes loans of consolidated VIEs of $298 million and $327 million at September 30, 2014 and December 31, 2013, respectively.

[5] Includes $284 million of loans carried at fair value, the majority of which were accruing current.

[6] Includes $302 million of loans carried at fair value, the majority of which were accruing current.

[7] Excludes $651 million and $3.4 billion at September 30, 2014 and December 31, 2013, respectively, of guaranteed residential loans. At September 30, 2014 and December 31, 2013, the majority of these loans had FICO scores of 700 and above.

[8] Includes $284 million and $302 million of loans carried at fair value at September 30, 2014 and December 31, 2013, respectively.

[9] Excludes $5.3 billion and $5.5 billion of guaranteed student loans at September 30, 2014 and December 31, 2013, respectively.