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Acquired Property Net (Tables)
 3 Months Ended
Mar. 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 the related valuation allowance, for the three months ended March 31, 2015 and 2014.
 
For the Three Months Ended March 31,
 
2015
 
2014
 
(Dollars in millions)
Beginning balance — Acquired property
$
11,442

 
$
12,307

Additions
2,935

 
3,772

Disposals
(4,029
)
 
(3,335
)
Ending balance — Acquired property
10,348

 
12,744

Beginning balance — Valuation allowance
(824
)
 
(686
)
Increase in valuation allowance
(6
)
 
(98
)
Ending balance — Valuation allowance
(830
)
 
(784
)
Ending balance — Acquired property, net
$
9,518

 
$
11,960