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Acquired Property Net (Tables)
 12 Months Ended
Dec. 31, 2012
Real Estate [Abstract]  
Activity in acquired property and the related valuation allowance [Table Text Block]
The following table displays the activity in acquired property net of the related valuation allowance for the years ended December 31, 2012, 2011 and 2010.
 
For the Year Ended December 31,
 
2012
 
2011
 
2010
 
(Dollars in millions)
Beginning balance, January 1
$
11,373

 
$
16,173

 
$
9,142

Additions
16,292

 
18,049

 
25,199

Disposals
(16,629
)
 
(21,617
)
 
(16,237
)
Write-downs, net of recoveries
(547
)
 
(1,232
)
 
(1,931
)
Ending balance, December 31(1)
$
10,489

 
$
11,373

 
$
16,173


__________
(1) 
Includes valuation allowance of $669 million, $1.0 billion and $1.9 billion for the years ended December 31, 2012, 2011 and 2010, respectively.
Acquired properties held-for-use [Table Text Block]
The following table displays the activity and carrying amount of acquired properties held for use for the years ended December 31, 2012, 2011 and 2010.
 
For the Year Ended December 31,
 
2012
 
2011
 
2010
 
(Dollars in millions)
Beginning balance, January 1
 
$
835

 
 
 
$
889

 
 
 
$
44

Transfers in from held for sale, net and additions
 
1,173

 
 
 
1,045

 
 
 
977

Transfers to held for sale, net
 
(748
)
 
 
 
(547
)
 
 
 
(64
)
Depreciation, asset write-downs, and other
 
(387
)
 
 
 
(552
)
 
 
 
(68
)
Ending balance, December 31
 
$
873

 
 
 
$
835

 
 
 
$
889