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Acquired Property Net Acquired Property Net (Tables)
 3 Months Ended
Mar. 31, 2014
Real Estate [Abstract]  
Activity in acquired property and the related valuation allowance [Table Text Block]
The following table displays the activity in acquired property, and the related valuation allowance, for the three months ended March 31, 2014 and 2013.
 
For the Three Months
Ended March 31,
 
2014
 
2013
 
(Dollars in millions)
Beginning balance — Acquired property
$
12,307

 
$
11,158

Additions
3,772

 
3,774

Disposals
(3,335
)
 
(4,213
)
Ending balance — Acquired property
$
12,744

 
$
10,719

Beginning balance — Valuation allowance
(686
)
 
(669
)
(Increase) decrease in valuation allowance
(98
)
 
99

Ending balance — Valuation allowance
(784
)
 
(570
)
Ending balance — Acquired property, net
$
11,960

 
$
10,149