Composition of the Company's Loan Portfolio (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 127,877	[1]	$ 121,470	[1]
Loans Held for Sale	1,699	[2]	3,399	[2]
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	64,310		58,888
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	43,190		43,199
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	20,377		19,383
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	57,974		54,048
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	5,481		4,127
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	855		713
Residential Guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,416		4,252
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	24,412	[3],[4]	23,389	[3],[5]
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	14,809	[3]	14,805	[3]
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	553	[3]	753	[3]
Federally Guaranteed Student Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	5,545		5,357
Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,829	[6]	2,396	[6]
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	11,272	[6]	10,998	[6]
Consumer Credit Card Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	731	[6]	632	[6]
Loans Held For Investment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	127,877	[7]	121,470	[7]
Loans Held For Investment [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	57,974		54,048
Loans Held For Investment [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	5,481		4,127
Loans Held For Investment [Member] | Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	855		713
Loans Held For Investment [Member] | Residential Guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,416		4,252
Loans Held For Investment [Member] | Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	24,412	[8]	23,389	[8]
Loans Held For Investment [Member] | Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	14,809		14,805
Loans Held For Investment [Member] | Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	553		753
Loans Held For Investment [Member] | Federally Guaranteed Student Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	5,545		5,357
Loans Held For Investment [Member] | Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,829		2,396
Loans Held For Investment [Member] | Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	11,272		10,998
Loans Held For Investment [Member] | Consumer Credit Card Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	731		632
Commercial Portfolio Segment [Member] | Loans | Loans Held For Investment [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	64,310		58,888
Residential Portfolio Segment [Member] | Loans | Loans Held For Investment [Member] | Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	43,190		43,199
Consumer Portfolio Segment [Member] | Loans | Loans Held For Investment [Member] | Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 20,377		$ 19,383

[1] 2 Includes loans of consolidated VIEs of $327 million and $365 million at December 31, 2013 and 2012, respectively.

[2] 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.

[3] Excludes $3.4 billion and $4.3 billion at December 31, 2013 and 2012, respectively, of guaranteed residential loans. At December 31, 2013 and 2012, the majority of these loans had FICO scores of 700 and above.

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

[5] Includes $379 million of loans carried at fair value, the majority of which were accruing current.

[6] Excludes $5.5 billion and $5.4 billion at December 31, 2013 and 2012, respectively, of guaranteed student loans

[7] Loans are presented net of unearned income, unamortized discounts and premiums, and net deferred loan costs of $739 million and $805 million at December 31, 2013 and 2012, respectively.

[8] Includes $302 million and $379 million of loans carried at fair value at December 31, 2013 and 2012, respectively.