Loans - Composition of Loans Held-for-Investment Portfolio (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Receivables [Abstract]
Domestic credit card loans	$ 69,538	$ 82,328
International credit card loans	8,031	8,614
Total credit card loans	77,569	90,942
Domestic installment loans	398	813
Total credit card	77,967	91,755
Auto	30,803	27,123
Home loan	36,817	44,100
Other retail	3,665	3,904
Total consumer banking	71,285	75,127
Commercial and multifamily real estate	19,523	17,732
Commercial and industrial	21,848	19,892
Total commercial lending	41,371	37,624
Small-ticket commercial real estate	1,028	1,196
Total commercial banking	42,399	38,820
Other loans	163	187
Total loans held for investment	$ 191,814	$ 205,889	$ 203,132

Reflects the gross carrying amount of unpaid loans issued to individuals to acquire goods that are expected to have a useful life greater than a year, including automobiles. The loans generally are secured by the asset purchased and are typically repaid monthly in installments of principal and interest.

No definition available.