Businesses Held for Sale, Financing Receivables Held for Sale and Discontinued Operations (WMC) (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) Lawsuits	Sep. 30, 2014 USD ($)
Financial Information For Businesses Held For Sale [Line Items]
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	[1]	$ (347)	$ 706	$ (10,332)	$ 2,070
WMC
Financial Information For Businesses Held For Sale [Line Items]
Adjustment For Pending Claims For Unmet Representations And Warranties				$ 7
Number Of Securitizations Related To Lawsuits Involving repurchase Claims On Loans In Which Adverse Parties Are Securitization Trustees				14
Number Of Lawsuits Involving Repurchase Claims On Loans | Lawsuits				15
WMC | Lower Limit
Financial Information For Businesses Held For Sale [Line Items]
Increase To Reserve For Claims For Unmet Representations And Warranties For Ten Percent Adverse Effect In Assumptions				$ 0
WMC | Upper Limit
Financial Information For Businesses Held For Sale [Line Items]
Increase To Reserve For Claims For Unmet Representations And Warranties For Ten Percent Adverse Effect In Assumptions				$ 500

[1] Amounts may not add due to rounding.