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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2012
Income Taxes [Abstract]  
Components of income tax expense
                 
    Three Months Ended  
March 31,
 
(Dollars in Millions)   2012     2011  

Federal

               

Current

  $ 404     $ 406  

Deferred

    68       (44
                 

Federal income tax

    472       362  

State

               

Current

    50       10  

Deferred

    5       (6
                 

State income tax

    55       4  
                 

Total income tax provision

  $ 527     $ 366  
                 
Reconciliation of expected income tax expense at the federal statutory rate of 35% percent to the Company's applicable income tax expense
                 
    Three Months Ended  
March 31,
 
(Dollars in Millions)   2012     2011  

Tax at statutory rate

  $ 641     $ 488  

State income tax, at statutory rates, net of federal tax benefit

    36       3  

Tax effect of

               

Tax credits, net of related expenses

    (89     (87

Tax-exempt income

    (55     (56

Noncontrolling interests

    11       6  

Other items

    (17     12  
                 

Applicable income taxes

  $ 527     $ 366