Other Assets (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Other Assets [Abstract]
Derivatives	$ 49	$ 26
Repurchase eligible loans	42	104
Equity method investments	32	32
Mortgage loans in foreclosure, net	23	24
Real estate owned, net	15	21
Income taxes receivable	0	23
Other	21	17
Total	$ 182	$ 247
Repurchase eligibility, prior number of days delinquent	90 days