Businesses Held for Sale, Financing Receivables Held for Sale and Discontinued Operations (Rollforward) (Details) - 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]
Earnings (loss) from discontinued operations, net of taxes	[1]	$ (347)	$ 706	$ (10,332)	$ 2,070
WMC
Financial Information For Discontinued Operations [Line Items]
Reserve, beginning of period		825	549	809	800	$ 800
Provision		28	40	46	142
Reserve, ending of period		832	588	832	588	809
Pending claims, beginning of period				3,694
New claims				8,411		9,225
Claim resolutions		(21)	$ (1)	(23)	$ (354)
Pending claims, ending of period		$ 3,468		$ 3,468		$ 3,694

[1] Amounts may not add due to rounding.