v2.4.0.6
Intangible Assets, Amortization Expense (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]    
Three months ended March 31, 2013 (actual) $ 377 $ 419
Finite Lived Intangible Assets [Member]
    
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]    
Three months ended March 31, 2013 (actual) 440  
Estimate for the remainder of 2013 1,310  
Estimate for year ended December 31,    
2014 1,575  
2015 1,435  
2016 1,284  
2017 1,155  
2018 1,031  
Amortized MSRs [Member]
    
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]    
Three months ended March 31, 2013 (actual) 62  
Estimate for the remainder of 2013 180  
Estimate for year ended December 31,    
2014 212  
2015 186  
2016 153  
2017 109  
2018 78  
Core deposit intangibles [Member]
    
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]    
Three months ended March 31, 2013 (actual) 310  
Estimate for the remainder of 2013 931  
Estimate for year ended December 31,    
2014 1,113  
2015 1,022  
2016 919  
2017 851  
2018 769  
Customer Relationships And Other [Member]
    
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]    
Three months ended March 31, 2013 (actual) 68  
Estimate for the remainder of 2013 199  
Estimate for year ended December 31,    
2014 250  
2015 227  
2016 212  
2017 195  
2018 $ 184