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Accumulated Other Comprehensive Income (Loss) (Tables)
9 Months Ended
Sep. 30, 2012
Other Comprehensive Income, net of tax  
Balances in accumulated other comprehensive income (loss)
    September 30, 2012 December 31, 2011 
      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 $ (932) $ (350) $ (582) $ (965) $ (362) $ (603) 
 Unrealized net gains (losses) on cash flow                  
   hedges   (294)   (110)   (184)   (254)   (95)   (159) 
 Unrealized net gains (losses) on securities                   
  available for sale   973   366   607   421   158   263 
 FDIC’s share of unrealized (gains) losses on                   
  securities available for sale under loss                   
  share agreements    (377)   (141)   (236)   (311)   (116)   (195) 
 Other, net  (30)   (16)   (14)   (37)   (18)   (19) 
   Total $ (660) $ (251) $ (409) $ (1,146) $ (433) $ (713)