Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Net interest income	$ 169	$ 182	$ 168	$ 184	$ 201	$ 210	$ 225	$ 232	$ 703		$ 868	$ 1,068
Provision for credit losses	13	18	192	27	(127)	(43)	(197)	2	250	[1]	(365)	(21)
Net interest income after provision for credit losses	156	164	(24)	157	328	253	422	230	453		1,233	1,089
Other revenues	93	(98)	138	(42)	(72)	169	47	82	91		226	881
Total operating expenses	507	232	522	148	176	174	121	217	1,409		688	932
Income (loss) from continuing operations before income tax	(258)	(166)	(408)	(33)	80	248	348	95	(865)		771	1,038
Income tax expense (benefit)	(114)	(129)	(200)	(28)	42	87	112	(17)	(471)		224	325
Income (loss) from continuing operations	(144)	(37)	(208)	(5)	38	161	236	112	(394)		547	713
Loss from discontinued operations	(29)	0	(8)	0	(2)	(9)	(7)	(6)	(37)		(24)	(177)
Net income (loss)	$ (173)	$ (37)	$ (216)	$ (5)	$ 36	$ 152	$ 229	$ 106	$ (431)		$ 523	$ 536

[1] The provision for credit losses and charge-offs for real estate secured receivables during the year ended December 31, 2015 includes $234 million related to the lower of amortized cost or fair value adjustment attributable to credit factors for receivables transferred to held for sale. See Note 7, "Receivables Held for Sale," for additional information. The provision for credit losses for real estate secured receivables during the year ended December 31, 2015 was impacted by a release of approximately $19 million associated with an out of period adjustment to our credit loss reserve calculation for a segment of our portfolio.