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		12 Months Ended
	Mar. 31, 2014		Dec. 31, 2013
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	$ 230,795	[1]	$ 230,189	[1]
Past Due	2,479	[2]	2,721	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	114		234
Loans
Principal Balance	129,196	[1]	127,877	[1]
Past Due	2,062	[2]	2,199	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	110		226
Loans | Commercial Portfolio Segment [Member]
Principal Balance	65,709	[1]	64,310	[1]
Past Due	248	[2]	272	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	19		45
Loans | Residential Portfolio Segment [Member]
Principal Balance	42,795	[1]	43,190	[1]
Past Due	1,224	[2]	1,296	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	68		156
Loans | Consumer Portfolio Segment [Member]
Principal Balance	20,692	[1]	20,377	[1]
Past Due	590	[2]	631	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	23		25
Managed Securitized Loans | Commercial Portfolio Segment [Member]
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement	1,680	[1]	1,617	[1]
Past Due	32	[2]	29	[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	99,919	[1]	100,695	[1]
Past Due	385	[2],[3]	493	[2],[3]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	$ 4		$ 8

[1] Excludes $1.5 billion and $1.7 billion of LHFS at March 31, 2014 and December 31, 2013, respectively.

[2] Excludes $13 million and $17 million of past due LHFS at March 31, 2014 and December 31, 2013, respectively.

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