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Acquired Property Net (Tables)
 9 Months Ended
Sep. 30, 2015
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 September 30,
 
For the Nine Months Ended September 30,
 
 
2015
 
2014
 
2015
 
2014
 
 
(Dollars in millions)
Beginning balance — Acquired property
 
$
9,199

 
$
12,296

 
$
11,442

 
$
12,307

Additions
 
2,236

 
3,240

 
7,602

 
10,437

Disposals
 
(3,125
)
 
(3,412
)
 
(10,734
)
 
(10,620
)
Ending balance — Acquired property
 
8,310

 
12,124

 
8,310

 
12,124

Beginning balance — Valuation allowance
 
(693
)
 
(736
)
 
(824
)
 
(686
)
Decrease (increase) in valuation allowance
 
74

 
(49
)
 
205

 
(99
)
Ending balance — Valuation allowance
 
(619
)
 
(785
)
 
(619
)
 
(785
)
Ending balance — Acquired property, net
 
$
7,691

 
$
11,339

 
$
7,691

 
$
11,339