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Acquired Property, Net (Tables)
 12 Months Ended
Dec. 31, 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 related valuation allowance.
 
For the Year Ended December 31,
 
2015
 
2014
 
2013
 
 
(Dollars in millions)
Beginning balance — Acquired property
 
$
11,442

 
 
 
$
12,307

 
 
 
$
11,158

Additions
 
9,382

 
 
 
13,100

 
 
 
16,092

Disposals
 
(13,343
)
 
 
 
(13,965
)
 
 
 
(14,943
)
Ending balance — Acquired property
 
7,481

 
 
 
11,442

 
 
 
12,307

 
 
 
 
 
 
 
 
 
 
 
Beginning balance — Valuation allowance
 
(824
)
 
 
 
(686
)
 
 
 
(669
)
Decrease (increase) in valuation allowance
 
109

 
 
 
(138
)
 
 
 
(17
)
Ending balance — Valuation allowance
 
(715
)
 
 
 
(824
)
 
 
 
(686
)
Ending balance — Acquired property, net
 
$
6,766

 
 
 
$
10,618

 
 
 
$
11,621