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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2013
Income Tax Disclosure [Abstract]  
Summary of Effective Tax Rates
Effective tax rates are analyzed as follows:
Three Months Ended March 31,
2013
 
2012
 
(dollars are in millions)
Tax expense (benefit) at the U.S. federal statutory income tax rate
$
160

 
35.0
 %
 
$
(278
)
 
(35.0
)%
Increase (decrease) in rate resulting from:
 
 
 
 
 
 
 
State and local taxes, net of Federal benefit
4

 
.9

 
(4
)
 
(.5
)
Validation of tax accounts (1)
(10
)
 
(2.2
)
 
—

 
—

Adjustment of tax rate used to value deferred taxes
(5
)
 
(1.1
)
 
(7
)
 
(.9
)
Change in valuation allowance reserves (2)
10

 
2.2

 
8

 
.9

Accrual of tax reserves(3)
(5
)
 
(1.1
)
 
(4
)
 
(.5
)
Other
(2
)
 
(.4
)
 
(3
)
 
(.3
)
Total income tax expense (benefit)
$
152

 
33.3
 %
 
$
(288
)
 
(36.3
)%
 
(1) 
For 2013, the amount relates to corrections to the current tax liability account and to deferred tax prior period adjustments.
(2) 
For 2013 and 2012, the amount relates to increase in valuation allowance on states with net operating loss carryforward periods of 15 to 20 years.
(3) 
For 2013 and 2012, the amounts primarily relate to the conclusion of state audits and expiration of state statutes of limitations.