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, 2017	Mar. 31, 2016	Dec. 31, 2016
Document Period End Date		Mar. 31, 2017
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement		$ 284,670		$ 278,197
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement		2,563		2,686
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		115	$ 88
Commercial Portfolio Segment [Member]
Principal Amount Outstanding of Loans Held-in-portfolio		78,253		78,224
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement		365		426
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		50	22
Residential Portfolio Segment [Member]
Principal Amount Outstanding of Loans Held-in-portfolio		38,550		38,990
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement		761		758
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		20	35
Consumer Portfolio Segment [Member]
Principal Amount Outstanding of Loans Held-in-portfolio		26,726		26,084
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement		890		949
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		42	28
Loans and Finance Receivables [Member]
Principal Amount Outstanding of Loans Held-in-portfolio		143,529		143,298
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement		2,016		2,133
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		112	85
Asset-backed Securities, Securitized Loans and Receivables [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	138,313		131,914
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	132		115
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	[2]	2,828		2,985
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	415		438
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		0	0
Commercial 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]	5,060		4,761
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1],[3]	0		0
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		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]	448		512
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	1		1
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		1	1
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]	132,805		126,641
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	131		$ 114
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	[4]	$ 2	$ 2

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

[2] 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.

[3] Comprised of commercial mortgages sold through Fannie Mae, Freddie Mac, and Ginnie Mae securitizations, whereby servicing has been retained by the Company.

[4] Net charge-offs are associated with $392 million and $410 million of managed securitized residential loans at March 31, 2017 and December 31, 2016, respectively. Net charge-off data is not reported to the Company for the remaining balance of $132.4 billion and $126.2 billion of managed securitized residential loans at March 31, 2017 and December 31, 2016, respectively.