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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	$ 267,716		$ 267,716		$ 258,212
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	2,670		2,670		2,377
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		139	$ 90	227	$ 193
Commercial Portfolio Segment [Member]
Principal Balance	[1]	77,448		77,448		75,252
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	524		524		344
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		90	16	112	33
Residential Portfolio Segment [Member]
Principal Balance	[1]	39,449		39,449		38,928
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	768		768		729
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		24	51	58	110
Consumer Portfolio Segment [Member]
Principal Balance	[1]	24,759		24,759		22,262
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	693		693		580
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		23	20	51	44
Loans and Finance Receivables [Member]
Principal Balance	[1]	141,656		141,656		136,442
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	1,985		1,985		1,653
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		137	87	221	187
Asset-backed Securities, Securitized Loans and Receivables [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1],[3]	122,646		122,646		117,797
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2],[3]	192		192		127
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		2	3	6	6
Loans [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1],[4]	3,414		3,414		3,973
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2],[4]	493		493		597
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		0	0	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],[3]	652		652		807
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement		0		0		1	[2],[3]
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		0	0	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],[3]	121,994		121,994		116,990
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2],[3]	192		192		$ 126
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	[5]	$ 2	$ 3	$ 4	$ 6

[1] Excludes $2.5 billion and $1.8 billion of LHFS at June 30, 2016 and December 31, 2015, respectively.

[2] Excludes $1 million of past due LHFS at both June 30, 2016 and December 31, 2015.

[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 to private investors with servicing rights retained. Net charge-offs on these loans are not presented in the table as the data is not reported to the Company by the private investors that own these related loans.

[5] Net charge-offs are associated with $452 million and $501 million of managed securitized residential loans at June 30, 2016 and December 31, 2015, respectively. Net charge-off data is not reported to the Company for the remaining balance of $121.5 billion and $116.5 billion of managed securitized residential loans at June 30, 2016 and December 31, 2015, respectively.