Portfolio Balances and Delinquency Balances Based on 90 days or more Past Due and Net Charge-Offs Related to Managed Portfolio Loans (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012	Dec. 31, 2012
Principal Balance	$ 226,031	[1]		$ 226,031	[1]		$ 228,114	[1]
Past Due	3,843	[2]		3,843	[2]		4,538	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	185		359	419		788
Loans
Principal Balance	122,031	[1]		122,031	[1]		121,470	[1]
Past Due	2,146	[2]		2,146	[2]		2,329	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	179		350	405		772
Loans | Commercial Portfolio Segment [Member]
Principal Balance	60,045	[1]		60,045	[1]		58,888	[1]
Past Due	322	[2]		322	[2]		320	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	44		63	89		164
Loans | Residential Portfolio Segment [Member]
Principal Balance	42,280	[1]		42,280	[1]		43,199	[1]
Past Due	1,463	[2]		1,463	[2]		1,941	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	119		268	275		565
Loans | Consumer Portfolio Segment [Member]
Principal Balance	19,706	[1]		19,706	[1]		19,383	[1]
Past Due	361	[2]		361	[2]		68	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	16		19	41		43
Managed Securitized Loans | Commercial Portfolio Segment [Member]
Principal Balance	1,732	[1]		1,732	[1]		1,767	[1]
Past Due	24	[2]		24	[2]		23	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	0		0	0		0
Managed Securitized Loans | Residential Portfolio Segment [Member]
Principal Balance	102,268	[1]		102,268	[1]		104,877	[1]
Past Due	1,673	[2],[3]		1,673	[2],[3]		2,186	[2],[3]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	$ 6		$ 9	$ 14		$ 16

[1] Excludes $3.6 billion and $3.4 billion of LHFS at June 30, 2013 and December 31, 2012, respectively.

[2] Excludes $49 million and $38 million of past due LHFS at June 30, 2013 and December 31, 2012, respectively.

[3] Excludes loans that have completed the foreclosure or short sale process (i.e., involuntary prepayments).