Businesses Held for Sale, Financing Receivables Held for Sale and Discontinued Operations (Rollforward of the Reserve) (Details) - WMC - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Financial Information For Discontinued Operations [Line Items]
Reserve, beginning of period	$ 825	$ 549	$ 809	$ 800	$ 800
Provision	28	40	46	142
Claim resolutions	(21)	(1)	(23)	(354)
Reserve, end of period	832	$ 588	832	$ 588	809
Pending claims, beginning of period			3,694
New claims			8,411		9,225
Pending claims, end of period	3,468		3,468		$ 3,694
Claims Relating To Alleged Breaches Of Representations That Are Beyond Applicable Statute Of Llimitations	$ 426		$ 426