Receivables - Receivables (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014
Real estate secured:
Total receivables	$ 21,729				$ 25,481
Total real estate secured receivables	21,729	[1],[2],[3]	22,670	[1],[2],[3]
Accrued interest income and other	776		789
Credit loss reserve for receivables	(2,110)		(2,217)
Total receivables, net	20,395		21,242
First Lien [Member]
Real estate secured:
Total receivables	19,308		20,153		22,599
Second Lien [Member]
Real estate secured:
Total receivables	$ 2,421		$ 2,517		$ 2,882

[1] At March 31, 2015 and December 31, 2014, nonaccrual real estate secured receivables held for investment include $571 million and $739 million, respectively, of TDR Loans, some of which may also be carried at fair value of the collateral less cost to sell

[2] At March 31, 2015 and December 31, 2014, nonaccrual real estate secured receivables held for investment include $298 million and $417 million, respectively, of receivables that are carried at the lower of amortized cost or fair value of the collateral less cost to sell.

[3] The receivable balances included in this table reflect the current carrying amount of the loan excluding certain basis adjustments to the loan such as deferred fees and costs on originated loans, purchase accounting fair value adjustments and premiums or discounts on purchased receivables.