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			12 Months Ended
	Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2013
Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other			$ 12	$ 7		$ 19	$ 10
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	229,436	[1]		229,436	[1]			230,189	[1]
Past Due	2,268	[2]		2,268	[2]			2,721	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	116		185	230		419
Loans
Principal Balance	129,744	[1]		129,744	[1]			127,877	[1]
Past Due	1,944	[2]		1,944	[2]			2,199	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	113		179	223		405
Loans | Commercial Portfolio Segment [Member]
Principal Balance	68,538	[1]		68,538	[1]			64,310	[1]
Past Due	258	[2]		258	[2]			272	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	26		44	45		89
Loans | Residential Portfolio Segment [Member]
Principal Balance	39,861	[1]		39,861	[1]			43,190	[1]
Past Due	1,102	[2]		1,102	[2]			1,296	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	67		119	135		275
Loans | Consumer Portfolio Segment [Member]
Principal Balance	21,345	[1]		21,345	[1]			20,377	[1]
Past Due	584	[2]		584	[2]			631	[2]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	20		16	43		41
Managed Securitized Loans | Commercial Portfolio Segment [Member]
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement	0	[1]		0	[1]			1,617	[1]
Past Due	0	[2]		0	[2]			29	[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 Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement	99,692	[1]		99,692	[1]			100,695	[1]
Past Due	324	[2],[3]		324	[2],[3]			493	[2],[3]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	3		6	7		14
Residential Mortgage [Member]
Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other	$ 7		$ 11	$ 10	[4],[5]	$ 17

[1] Excludes $4.0 billion and $1.7 billion of LHFS at June 30, 2014 and December 31, 2013, respectively.

[2] Excludes $1 million and $17 million of past due LHFS at June 30, 2014 and December 31, 2013, respectively.

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

[4] Does not include GSE mortgage loan transfers

[5] The transfer activity is related to unconsolidated VIEs.