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
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	$ 261,753		$ 258,212
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	2,663		2,377
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		88	$ 102
Commercial Portfolio Segment [Member]
Principal Balance	[1]	77,495		75,252
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	591		344
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		22	17
Residential Portfolio Segment [Member]
Principal Balance	[1]	38,999		38,928
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	771		729
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		35	59
Consumer Portfolio Segment [Member]
Principal Balance	[1]	23,252		22,262
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	609		580
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		28	23
Loans and Finance Receivables [Member]
Principal Balance	[1]	139,746		136,442
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	1,971		1,653
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		85	99
Asset-backed Securities, Securitized Loans and Receivables [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	118,263		117,797
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	127		127
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		3	3
Loans [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1],[3]	3,744		3,973
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	565		597
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	[3]	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]	729	0	807
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	0		1
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		1	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]	117,534		116,990
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2],[4]	127		$ 126
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	[5]	$ 2	$ 3

[1] Excludes $1.9 billion and $1.8 billion of LHFS at March 31, 2016 and December 31, 2015, respectively.

[2] Excludes $1 million of past due LHFS at March 31, 2016.

[3] 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.

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

[5] Net charge-offs are associated with $480 million and $501 million of managed securitized residential loans at March 31, 2016 and December 31, 2015, respectively. Net charge-off data is not reported to the Company for the remaining balance of $117.1 billion and $116.5 billion of managed securitized residential loans at March 31, 2016 and December 31, 2015, respectively.