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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2013
Income Tax Disclosure [Abstract]  
Effective Tax Rates
The following table is an analysis of the difference between effective rates based on the total income tax provision attributable to pretax income and the statutory U.S. Federal income tax rate.
Three Months Ended March 31,
2013
 
2012
 
(dollars are in millions)
Tax expense at the U.S. federal statutory income tax rate
$
100

 
35.0
 %
 
$
34

 
35.0
 %
Increase (decrease) in rate resulting from:
 
 
 
 
 
 
 
State and local taxes, net of federal benefit
17

 
5.9

 
6

 
6.1

Adjustment of tax rate used to value deferred taxes
2

 
0.6

 
(10
)
 
(10.2
)
Validation of tax accounts
(10
)
 
(3.5
)
 
—

 
—

Accrual of tax reserves(1)
14

 
4.9

 
16

 
16.3

Tax exempt interest income
(3
)
 
(1.0
)
 
(2
)
 
(2.0
)
Tax credits and foreign operations
(18
)
 
(6.3
)
 
(25
)
 
(25.6
)
Other
2

 
0.6

 
(1
)
 
(1.2
)
Total income tax expense
$
104

 
36.2
 %
 
$
18

 
18.4
 %
 
(1) 
Tax reserves in 2013 and 2012 relate to state uncertain tax positions which we no longer believe we meet the more likely than not requirement for recognition.