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, 2016	Dec. 31, 2015
Document Period End Date		Dec. 31, 2016
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement		$ 278,197	$ 258,212
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement		2,686	2,377
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		494	355
Commercial Portfolio Segment [Member]
Principal Amount Outstanding of Loans Held-in-portfolio		78,224	75,252
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement		426	344
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		252	72
Residential Portfolio Segment [Member]
Principal Amount Outstanding of Loans Held-in-portfolio		38,990	38,928
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement		758	729
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		106	176
Consumer Portfolio Segment [Member]
Principal Amount Outstanding of Loans Held-in-portfolio		26,084	22,262
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement		949	580
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		125	93
Loans and Finance Receivables [Member]
Principal Amount Outstanding of Loans Held-in-portfolio		143,298	136,442
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement		2,133	1,653
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		483	341
Asset-backed Securities, Securitized Loans and Receivables [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	131,914	117,797
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	115	127
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement		11	14
Loans [Member]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	2,985	3,973
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[2]	438	597
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]	4,761	0
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]	512	807
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		3	2
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]	126,641	116,990
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	114	126
Net Credit Losses During Period on Loans Managed or Securitized or Asset-backed Financing Arrangement	[4]	$ 8	$ 12

[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 by Pillar through Fannie Mae, Freddie Mac, and Ginnie Mae securitizations, whereby servicing has been retained by the Company.

[4] Net charge-offs are associated with $410 million and $501 million of managed securitized residential loans at December 31, 2016 and 2015, respectively. Net charge-off data is not reported to the Company for the remaining balance of $126.2 billion and $116.5 billion of managed securitized residential loans at December 31, 2016 and 2015, respectively.