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
	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other	$ 4		$ 4
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	242,802	[1]		243,703	[1]
Past Due	1,768	[2]		1,874	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	102		114
Loans
Principal Balance	132,380	[1]		133,112	[1]
Past Due	1,592	[2]		1,691	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	99		110
Commercial Portfolio Segment [Member] | Loans
Principal Balance	73,447	[1]		73,392	[1]
Past Due	186	[2]		181	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	17		19
Residential Portfolio Segment [Member] | Loans
Principal Balance	38,445	[1]		38,775	[1]
Past Due	880	[2]		891	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	59		68
Residential Portfolio Segment [Member] | Managed Securitized Loans
Past Due	176	[2],[3]		183	[2],[3]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	3		4
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding	110,422	[1]		110,591	[1]
Consumer Portfolio Segment [Member] | Loans
Principal Balance	20,488	[1]		20,945	[1]
Past Due	526	[2]		619	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	$ 23		$ 23

[1] Excludes $3.4 billion and $3.2 billion of LHFS at March 31, 2015 and December 31, 2014, respectively.

[2] Excludes $12 million and $39 million of past due LHFS at March 31, 2015 and December 31, 2014, respectively.

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