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Businesses Held for Sale, Financing Receivables Held for Sale and Discontinued Operations (WMC) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Lawsuits
Jun. 30, 2014
USD ($)
Financial Information For Businesses Held For Sale [Line Items]        
Lawsuit Relating To Representations And Warranties Amount Of Mortgages $ 12,327   $ 12,327  
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent $ (3,747) $ 665 (9,985) $ 1,364
WMC Discontinued Operations [Member]        
Financial Information For Businesses Held For Sale [Line Items]        
Adjustment For Pending Claims For Unmet Representations And Warranties     $ 11  
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 Discontinued Operations [Member] | Minimum [Member]        
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 Discontinued Operations [Member] | Maximum [Member]        
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