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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2012
Income Tax Disclosure [Abstract]  
Reconciliation of Income Tax Expense
The table below provides a reconciliation of income tax expense computed at the federal statutory income tax rate to the income tax provision.
 
Three months ended
September 30,
 
Nine months ended
September 30,
(in millions)
2012
 
2011
 
2012
 
2011
Income before income taxes
$
564

 
$
666

 
$
1,186

 
$
1,378

Provision for income tax at federal statutory rate of 35%
197

 
233

 
415

 
482

Increase (decrease) in income tax from:
 
 
 
 
 
 
 
State tax – net of federal benefit
10

 
31

 
30

 
61

Property-related
(19
)
 
(18
)
 
(39
)
 
(38
)
Other
(12
)
 
(1
)
 
(22
)
 
(9
)
Total income tax expense
$
176

 
$
245

 
$
384

 
$
496

Effective tax rate
31
%
 
37
%
 
32
%
 
36
%
Reconciliation of Unrecognized Tax Benefits
The following table provides a reconciliation of unrecognized tax benefits:
(in millions)
 
2012
 
2011
Balance at January 1,
 
$
373

 
$
329

Tax positions taken during the current year:
 
 
 
 
Increases
 
23

 
58

Tax positions taken during a prior year:
 
 
 
 
Increases
 
154

 
44

Decreases
 
(33
)
 
(34
)
Decreases for settlements during the period
 
—

 
—

Balance at December 31,
 
$
517

 
$
397