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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2013
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The table below reconciles the U.S. statutory rate to the Company's effective tax rate for each period presented (in millions of dollars).
 
Three Months Ended March 31,
 
2013
 
2012
Income tax expense at federal statutory rate
$
38

 
35.0
 %
 
$
25

 
35.0
 %
REIT income not subject to tax
(11
)
 
(10.1
)%
 
(5
)
 
(7.7
)%
Other
(2
)
 
(1.5
)%
 
(1
)
 
(0.8
)%
Income tax expense before discrete items
25

 
23.4
 %
 
19

 
26.5
 %
Exchange of AFMC for CBPC
(19
)
 
(17.5
)%
 
—

 
—
 %
Other
(2
)
 
(1.8
)%
 
(1
)
 
(0.7
)%
Income tax expense as reported
$
4

 
4.1
 %
 
$
18

 
25.8
 %