Receivables Held for Investment, net - Aging Analysis of Past Due Loans (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total receivables		$ 9,156	[1],[2]	$ 22,670
Threshold period for current receivable		30 days
Real estate secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due receivables		$ 558
Current	[3]	8,598
Total receivables	[4]	9,156
First lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due receivables		398
Current	[3]	6,904
Total receivables	[4]	7,302
Second lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due receivables		160
Current	[3]	1,694
Total receivables	[4]	1,854
Past Due, 30 - 89 days [Member] | Real estate secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due receivables		277
Past Due, 30 - 89 days [Member] | First lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due receivables		179
Past Due, 30 - 89 days [Member] | Second lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due receivables		98
Past Due, 90 plus days [Member] | Real estate secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due receivables		281
Past Due, 90 plus days [Member] | First lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due receivables		219
Past Due, 90 plus days [Member] | Second lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due receivables		$ 62

[1] Includes $1,654 million of closed-end real estate secured receivables which serve as collateral for secured financings previously issued under public trusts with an outstanding balance of $879 million at December 31, 2015. See Note 17, "Variable Interest Entities," for additional information.

[2] Includes deferred origination fees, net of costs, totaling $71 million and net unamortized premium on our receivables totaling $35 million.

[3] Receivables less than 30 days past due are presented as current.

[4] The receivable balances included in this table reflect the principal amount outstanding on the loan net of any charge-off recorded in accordance with our existing charge-off policies and include certain basis adjustments to the loan such as unearned income, unamortized deferred fees and costs on originated loans, purchase accounting fair value adjustments and premiums or discounts on purchased loans. However, these basis adjustments on the loans are excluded in other presentations of dollars of two-months-and-over contractual delinquency, nonaccrual receivable and nonperforming receivable account balances.