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Businesses Held for Sale and Discontinued Operations (WMC) (Details)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Lawsuits
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Financial Information For Businesses Held For Sale [Line Items]                  
Earnings (loss) from discontinued operations, net of taxes $ (105)   $ 629       $ (954) $ (11,253)  
WMC                  
Financial Information For Businesses Held For Sale [Line Items]                  
Adjustment For Pending Claims For Unmet Representations And Warranties                 $ 195
Lawsuit Relating To Representations And Warranties Amount Of Mortgages                 6,894
Number Of Securitizations Related To Lawsuits Involving repurchase Claims On Loans In Which Adverse Parties Are Securitization Trustees             11    
Revenues and other income (loss)   $ 19   $ (22) $ (38) $ (26)      
Earnings (loss) from discontinued operations, net of taxes   $ (8)   $ (21) $ (60) $ (37)      
Number Of Lawsuits Involving Repurchase Claims On Loans | Lawsuits             10    
WMC | Lower Limit                  
Financial Information For Businesses Held For Sale [Line Items]                  
Increase To Reserve For Claims For Unmet Representations And Warranties For 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 Adverse Effect In Assumptions                 $ 500