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		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other		$ 4	$ 7	$ 8	$ 10
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	247,444		247,444		$ 243,703
Past Due	[2]	1,548		1,548		1,874
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		90	116	193	230
Loans [Member]
Principal Balance	[1]	132,538		132,538		133,112
Past Due	[2]	1,391		1,391		1,691
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		87	113	187	223
Managed Securitized Loans
Past Due	[2],[3]	157		157		183
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		3	3	6	7
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding	[1]	114,906		114,906		110,591
Commercial Portfolio Segment [Member] | Loans [Member]
Principal Balance	[1]	73,301		73,301		73,392
Past Due	[2]	178		178		181
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		16	26	33	45
Residential Portfolio Segment [Member] | Loans [Member]
Principal Balance	[1]	38,736		38,736		38,775
Past Due	[2]	728		728		891
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		51	67	110	135
Residential Portfolio Segment [Member] | Managed Securitized Loans
Past Due	[2],[3]	157		157		183
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		3	3	6	7
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding	[1]	113,930		113,930		110,591
Consumer Portfolio Segment [Member] | Loans [Member]
Principal Balance	[1]	20,501		20,501		20,945
Past Due	[2]	485		485		619
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		20	20	44	43
Consumer Portfolio Segment [Member] | Managed Securitized Loans
Past Due	[2],[3]	0		0		0
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		$ 0	$ 0	$ 0	$ 0
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding	[1]					$ 0

[1] Excludes $2.5 billion and $3.2 billion of LHFS at June 30, 2015 and December 31, 2014, respectively.

[2] Excludes $99 million and $39 million of past due LHFS at June 30, 2015 and December 31, 2014, respectively.

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