Payment Status for the LHFI Portfolio (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	$ 130,052		$ 130,575
Accruing 30-89 Days Past Due	736		846
Accruing 90+ Days Past Due	980		1,057
Nonaccruing	612	[1],[2]	634	[1],[2]
Total	132,380	[3]	133,112	[3]
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	65,369		65,246
Accruing 30-89 Days Past Due	44		36
Accruing 90+ Days Past Due	21		7
Nonaccruing	140	[1]	151	[1]
Total	65,574		65,440
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	6,362		6,716
Accruing 30-89 Days Past Due	3		3
Accruing 90+ Days Past Due	0		1
Nonaccruing	24	[1]	21	[1]
Total	6,389		6,741
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,389		6,741
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	73,214		73,171
Accruing 30-89 Days Past Due	47		40
Accruing 90+ Days Past Due	21		8
Nonaccruing	165	[2]	173	[2]
Total	73,447		73,392
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	1,483		1,209
Accruing 30-89 Days Past Due	0		1
Accruing 90+ Days Past Due	0		0
Nonaccruing	1	[1]	1	[1]
Total	1,484		1,211
Residential Guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	195		176
Accruing 30-89 Days Past Due	34		34
Accruing 90+ Days Past Due	426		422
Nonaccruing	0		0
Total	655		632
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	23,058	[4]	23,067	[4]
Accruing 30-89 Days Past Due	95		108
Accruing 90+ Days Past Due	12		14
Nonaccruing	254	[1]	254	[1]
Total	23,419	[4],[5]	23,443	[4],[5]
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	37,346		37,634
Accruing 30-89 Days Past Due	219		250
Accruing 90+ Days Past Due	438		436
Nonaccruing	442	[2]	455	[2]
Total	38,445		38,775
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	13,705		13,989
Accruing 30-89 Days Past Due	84		101
Accruing 90+ Days Past Due	0		0
Nonaccruing	165	[1]	174	[1]
Total	13,954	[5]	14,264	[5]
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	388		402
Accruing 30-89 Days Past Due	6		7
Accruing 90+ Days Past Due	0		0
Nonaccruing	23	[1]	27	[1]
Total	417	[5]	436	[5]
Federally Guaranteed Student Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	3,454		3,801
Accruing 30-89 Days Past Due	372		425
Accruing 90+ Days Past Due	511		601
Nonaccruing	0		0
Total	4,337		4,827
Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	4,912		4,545
Accruing 30-89 Days Past Due	18		19
Accruing 90+ Days Past Due	3		3
Nonaccruing	4	[1]	6	[1]
Total	4,937	[6]	4,573	[6]
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	19,492		19,770
Accruing 30-89 Days Past Due	470		556
Accruing 90+ Days Past Due	521		613
Nonaccruing	5	[2]	6	[2]
Total	20,488		20,945
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	10,260		10,537
Accruing 30-89 Days Past Due	74		104
Accruing 90+ Days Past Due	1		3
Nonaccruing	1	[1]	0
Total	10,336	[6]	10,644	[6]
Consumer Credit Card Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	866		887
Accruing 30-89 Days Past Due	6		8
Accruing 90+ Days Past Due	6		6
Nonaccruing	0		0
Total	$ 878	[6]	$ 901	[6]

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

[2] Nonaccruing loans past due 90 days or more totaled $379 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] Includes loans of consolidated VIEs of $277 million and $288 million at March 31, 2015 and December 31, 2014, respectively.

[4] Includes $268 million of loans carried at fair value, the majority of which were accruing current.

[5] Excludes $655 million and $632 million of guaranteed residential loans at March 31, 2015 and December 31, 2014, respectively.

[6] Excludes $4.3 billion and $4.8 billion of guaranteed student loans at March 31, 2015 and December 31, 2014, respectively.