Receivables Held for Sale - Summary of Activity in Receivables Held for Sale (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Receivables Held for Sale, Activity [Roll Forward]
Receivables held for sale at beginning of period	[1]			$ 860
Receivables held for sale at end of period	[1]	$ 10,310		10,310
Mortgage Loans on Real Estate [Member]
Receivables Held for Sale, Activity [Roll Forward]
Receivables held for sale at beginning of period		1,097	$ 2,420	860	$ 2,047
Loan receivables Held-for-Sale, Sales		(301)	(884)	(301)	(884)
Lower of amortized cost or fair value adjustment on receivables held for sale		(54)	139	(71)	310
Carrying value of real estate secured receivables held for sale settled through short sale or transfer to REO		(37)	(67)	(72)	(148)
Change in real estate secured receivable balance, including collections		(101)	(6)	(108)	23
Transfer of real estate secured receivables into held for investment at the lower of amortized cost or fair value	[2]				(8)
Transfer of real estate secured receivables into held for sale at the lower of amortized cost or fair value	[3],[4]	9,706	272	10,002	534
Receivables held for sale at end of period	[5]	$ 10,310	$ 1,874	$ 10,310	$ 1,874

[1] 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.

[2] During the first quarter of 2014, we identified a small number of receivables held for sale which did not meet our criteria to be classified as held for sale. As a result we transferred these receivables to held for investment at the lower of amortized cost or fair value.

[3] Amount includes any accrued interest associated with the receivable.

[4] The initial lower of amortized cost or fair value adjustment on receivables transferred into held for sale during both the three and six months ended June 30, 2015, totaled $220 million compared with $42 million and $102 million during the three and six months ended June 30, 2014, respectively.

[5] The following table provides a rollforward of our valuation allowance for the three and six months ended June 30, 2015 and 2014. See Note 13, "Fair Value Measurements," for a discussion of the factors impacting the fair value of these receivables.