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	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	$ 230,189	[1]	$ 228,114	[1]
Past Due	2,721	[2]	4,538	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	701		1,711
Loans
Principal Balance	127,877	[1]	121,470	[1]
Past Due	2,199	[2]	2,329	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	678		1,681
Loans | Commercial Portfolio Segment [Member]
Principal Balance	64,310	[1]	58,888	[1]
Past Due	272	[2]	320	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	153		303
Loans | Residential Portfolio Segment [Member]
Principal Balance	43,190	[1]	43,199	[1]
Past Due	1,296	[2]	1,941	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	444		1,285
Loans | Consumer Portfolio Segment [Member]
Principal Balance	20,377	[1]	19,383	[1]
Past Due	631	[2]	68	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	81		93
Managed Securitized Loans | Commercial Portfolio Segment [Member]
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement	1,617	[1]	1,767	[1]
Past Due	29	[2]	23	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	0		0
Managed Securitized Loans | Residential Portfolio Segment [Member]
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement	100,695	[1]	104,877	[1]
Past Due	493	[2],[3]	2,186	[2],[3]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	$ 23		$ 30

[1] Excludes $1.7 billion and $3.4 billion of LHFS at December 31, 2013 and 2012, respectively.

[2] Excludes $17 million and $38 million of past due LHFS at December 31, 2013 and 2012, respectively.

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