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Accumulated Other Comprehensive Income (Loss) (Tables)
9 Months Ended
Sep. 30, 2011
Accumulated Other Comprehensive Income (Loss) 
Balances in Accumulated Other Comprehensive Income (Loss)
    September 30, 2011 December 31, 2010 
      Deferred After-   Deferred After- 
    Pre-Tax Tax Expense Tax Pre-Tax Tax Expense Tax 
    Amount (Benefit) Amount Amount (Benefit) Amount 
                      
    (Dollars in millions) 
 Unrecognized net pension and postretirement                  
   costs $ (563) $ (210) $ (353) $ (587) $ (219) $ (368) 
 Unrealized net gains (losses) on cash flow                  
   hedges   (253)   (94)   (159)   (75)   (28)   (47) 
 Unrealized net gains (losses) on securities                   
  available for sale   698   260   438   (250)   (93)   (157) 
 FDIC’s share of unrealized (gains) losses on                   
  securities available for sale under the loss                   
  share agreements (1)   (412)   (154)   (258)   (281)   (105)   (176) 
 Other, net  (42)   (18)   (24)   (6)   (7)   1 
   Total $ (572) $ (216) $ (356) $ (1,199) $ (452) $ (747) 
                      
                      
(1)Certain securities available for sale are covered by loss sharing agreements with the FDIC. Refer to the Securities footnote to these financial statements for additional information.
Components of Total Comprehensive Income
      Three Months Ended September 30, 2011 
      Pre-Tax Tax Effect After-Tax 
               
      (Dollars in millions) 
 Comprehensive income:         
  Net income $ 439 $ 68 $ 371 
  Other comprehensive income:         
   Unrealized net holding gains (losses) arising during the period          
    on securities available for sale   464   173   291 
   Reclassification adjustment for (gains) losses on securities          
    available for sale included in net income   39   14   25 
   Net change in amounts attributable to the FDIC under the loss          
    share agreements   (47)   (18)   (29) 
   Net change in unrecognized gains (losses) on cash flow hedges   (111)   (41)   (70) 
   Net change in pension and postretirement liability   9   3   6 
   Other, net  (2)   3   (5) 
     Total comprehensive income $ 791 $ 202 $ 589 
               

      Three Months Ended September 30, 2010 
      Pre-Tax Tax Effect After-Tax 
               
      (Dollars in millions) 
 Comprehensive income:         
  Net income $ 246 $ 27 $ 219 
  Other comprehensive income:         
   Unrealized net holding gains (losses) arising during the period          
    on securities available for sale   315   119   196 
   Reclassification adjustment for (gains) losses on securities         
     available for sale included in net income   (239)   (91)   (148) 
   Net change in amounts attributable to the FDIC under the loss          
    share agreements   (117)   (44)   (73) 
   Net change in unrecognized gains (losses) on cash flow hedges   (125)   (47)   (78) 
   Net change in pension and postretirement liability   6   2   4 
   Other, net    (1)   1 
     Total comprehensive income $ 86 $ (35) $ 121 
               

      Nine Months Ended September 30, 2011 
      Pre-Tax Tax Effect After-Tax 
               
      (Dollars in millions) 
 Comprehensive income:         
  Net income $ 1,144 $ 212 $ 932 
  Other comprehensive income:         
   Unrealized net holding gains (losses) arising during the period          
    on securities available for sale   872   324   548 
   Reclassification adjustment for (gains) losses on securities          
    available for sale included in net income   41   15   26 
   Net change in amounts attributable to the FDIC under the loss          
    share agreements   (131)   (49)   (82) 
   Net change in unrecognized gains (losses) on cash flow hedges   (178)   (66)   (112) 
   Net change in pension and postretirement liability   24   9   15 
   Other, net  (1)   3   (4) 
     Total comprehensive income $ 1,771 $ 448 $ 1,323 
               

      Nine Months Ended September 30, 2010 
      Pre-Tax Tax Effect After-Tax 
               
      (Dollars in millions) 
 Comprehensive income:         
  Net income $ 737 $ 100 $ 637 
  Other comprehensive income:         
   Unrealized net holding gains (losses) arising during the period          
    on securities available for sale   1,170   444   726 
   Reclassification adjustment for (gains) losses on securities          
    available for sale included in net income   (455)   (173)   (282) 
   Net change in amounts attributable to the FDIC under the loss share          
    agreements   (243)   (92)   (151) 
   Net change in unrecognized gains (losses) on cash flow hedges   (340)   (129)   (211) 
   Net change in pension and postretirement liability   (1)   (1)   
   Other, net  (1)   (1)   
     Total comprehensive income $ 867 $ 148 $ 719