Loans Held for Investment portfolio and Related Allowance for Loan and Lease Losses (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Individually evaluated	$ 3,159		$ 3,078
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	363		364
Collectively evaluated	124,416		118,013
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,681		1,810
Total evaluated	127,575		121,091
Loans And Leases Receivable Allowance Loans Evaluated For Impairment Excluding Fair Value Loans	2,044		2,174
Loans Receivable, Fair Value Disclosure	302		379
Total	127,877	[1]	121,470	[1]
Loans and Leases Receivable, Allowance	2,044		2,174		2,457
Commercial Portfolio Segment [Member]
Individually evaluated	171		138
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	10		7
Collectively evaluated	64,139		58,750
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	936		895
Total evaluated	64,310		58,888
Loans And Leases Receivable Allowance Loans Evaluated For Impairment Excluding Fair Value Loans	946		902
Loans Receivable, Fair Value Disclosure	0		0
Total	64,310		58,888
Loans and Leases Receivable, Allowance	946		902		964
Residential Portfolio Segment [Member]
Individually evaluated	2,878		2,859
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	345		348
Collectively evaluated	40,010		39,961
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	585		783
Total evaluated	42,888		42,820
Loans And Leases Receivable Allowance Loans Evaluated For Impairment Excluding Fair Value Loans	930		1,131
Loans Receivable, Fair Value Disclosure	302		379
Total	43,190		43,199
Loans and Leases Receivable, Allowance	930		1,131		1,354
Consumer Portfolio Segment [Member]
Individually evaluated	110		81
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	8		9
Collectively evaluated	20,267		19,302
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	160		132
Total evaluated	20,377		19,383
Loans And Leases Receivable Allowance Loans Evaluated For Impairment Excluding Fair Value Loans	168		141
Loans Receivable, Fair Value Disclosure	0		0
Total	20,377		19,383
Loans and Leases Receivable, Allowance	$ 168		$ 141		$ 139

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