Receivables Held for Sale - Summary of Secured Receivables Transferred to REO or the Underlying Collateral Sold in a Short Sale (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Transferred to REO after obtaining title to the underlying collateral [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Carrying value of real estate secured receivables held for sale settled through short sale or transfer to REO	$ 22	$ 47	$ 46	$ 117
Impact to lower of amortized cost or FV adjustment previously recorded resulting from the transfer to REO or short sales	0	(2)	0	2
Underlying collateral sold in a short sale [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Carrying value of real estate secured receivables held for sale settled through short sale or transfer to REO	15	20	26	31
Impact to lower of amortized cost or FV adjustment previously recorded resulting from the transfer to REO or short sales	$ 1	$ 0	$ 2	$ 1