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Acquired Property, Net (Tables)
3 Months Ended
Mar. 31, 2016
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,
 
2016
 
2015
 
(Dollars in millions)
Beginning balance — Acquired property
$
7,481

 
$
11,442

Additions
1,837

 
2,935

Disposals
(2,581
)
 
(4,029
)
Ending balance — Acquired property
6,737

 
10,348

Valuation allowance
(549
)
 
(830
)
Ending balance — Acquired property, net
$
6,188

 
$
9,518