Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Net interest income	$ 82	$ 109	$ 140	$ 182	$ 169	$ 182	$ 168	$ 184	$ 513		$ 703		$ 868
Provision for credit losses	0	572	12	37	13	18	192	27	621	[1]	250	[1]	(365)
Net interest income after provision for credit losses	82	(463)	128	145	156	164	(24)	157	(108)		453		1,233
Other revenues	141	(11)	392	(133)	93	(98)	138	(42)	389		91		226
Total operating expenses	109	135	713	138	507	232	522	148	1,095		1,409		688
Income (loss) from continuing operations before income tax	114	(609)	(193)	(126)	(258)	(166)	(408)	(33)	(814)		(865)		771
Income tax expense (benefit)	64	(203)	(63)	(56)	(114)	(129)	(200)	(28)	(258)		(471)		224
Income (loss) from continuing operations	50	(406)	(130)	(70)	(144)	(37)	(208)	(5)	(556)		(394)		547
Loss from discontinued operations	33	2	(4)	(4)	(29)	0	(8)	0	27		(37)		(24)
Net income (loss)	$ 83	$ (404)	$ (134)	$ (74)	$ (173)	$ (37)	$ (216)	$ (5)	$ (529)		$ (431)		$ 523

[1] The provision for credit losses and charge-offs for real estate secured receivables during the year ended December 31, 2016 includes $576 million related to the initial lower of amortized cost or fair value adjustment attributable to credit factors for receivables transferred to held for sale. For the year ended December 31, 2015, the provision for credit losses and charge-offs included $234 million related to the initial 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. During the year ended December 31, 2016, net charge-offs dollars were impacted by an out of period adjustment which decreased net charge-offs by $12 million in order to properly reflect charge-offs for receivables which received a partial forgiveness of principal as a result of an account modification in prior periods. 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 a correction to our credit loss reserve calculation for a segment of our portfolio.