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Commitments, Guarantees, Product Warranties and Other Loss Contingencies (WMC) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Nov. 02, 2015
Mar. 31, 2017
USD ($)
Securitizations
Lawsuits
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Financial Information For Businesses Held For Sale [Line Items]        
Adjustment For Pending Claims For Unmet Representations And Warranties   $ 5,456   $ 8,047
Lawsuit Relating To Representations And Warranties Amount Of Mortgages   1,060   2,887
Earnings (loss) from discontinued operations, net of taxes   $ (239) $ (308)  
Pending claims, end of period       6,516
Date of lawsuit filing Jan-07      
WMC        
Financial Information For Businesses Held For Sale [Line Items]        
Adjustment For Pending Claims For Unmet Representations And Warranties       249
Number Of Securitizations Related To Lawsuits Involving repurchase Claims On Loans In Which Adverse Parties Are Securitization Trustees | Securitizations   11    
Revenues and other income (loss)   $ 13 (39)  
Earnings (loss) from discontinued operations, net of taxes   $ (1) $ (32)  
Number Of Lawsuits Involving Repurchase Claims On Loans | Lawsuits   10    
WMC | ResCap Liquidating Trust [Member]        
Financial Information For Businesses Held For Sale [Line Items]        
Date of lawsuit filing   23-Jan-17    
Date of bankruptcy filing   May 01, 2012    
Proceeds from sale of loans       $ 840
WMC | Lower Limit        
Financial Information For Businesses Held For Sale [Line Items]        
Increase to Reserve for Claims For Unmet Representations And Warranties   $ 0    
WMC | Upper Limit        
Financial Information For Businesses Held For Sale [Line Items]        
Increase to Reserve for Claims For Unmet Representations And Warranties   $ 500