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		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	$ 258,212	$ 248,646
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	2,377	2,579
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		355	461
Commercial Portfolio Segment [Member]
Principal Balance	[1]	75,252	73,392
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	344	181
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		72	71
Residential Portfolio Segment [Member]
Principal Balance	[1]	38,928	38,775
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	729	891
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		176	279
Consumer Portfolio Segment [Member]
Principal Balance	[1]	22,262	20,945
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	580	619
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		93	95
Loans and Finance Receivables [Member]
Principal Balance	[1]	136,442	133,112
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	1,653	1,691
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		341	445
Asset-backed Securities, Securitized Loans and Receivables [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	117,797	110,591
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2],[3]	127	183
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		14	16
Loans [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1],[4]	3,973	4,943
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2],[4]	597	705
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	[4]	0	0
Consumer Portfolio Segment [Member] | Asset-backed Securities, Securitized Loans and Receivables [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	807	0
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	1	0
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		2	0
Residential Portfolio Segment [Member] | Asset-backed Securities, Securitized Loans and Receivables [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	116,990	110,591
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2],[3]	126	183
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		$ 12	$ 16

[1] Excludes $1.8 billion and $3.2 billion of LHFS at December 31, 2015 and 2014, respectively.

[2] Excludes $1 million and $39 million of past due LHFS at December 31, 2015 and 2014, respectively.

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

[4] Comprised of unsecuritized residential loans the Company originated and sold with servicing rights retained.