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Consolidations and Transfers of Financial Assets (Tables)
12 Months Ended
Dec. 31, 2014
Consolidations and Transfers of Financial Assets [Abstract]  
Unconsolidated Variable Interest Entities [Table Text Block]
The following table displays the carrying amount and classification of our assets and liabilities that relate to our involvement with unconsolidated mortgage-backed trusts, as well as our maximum exposure to loss and the total assets of these unconsolidated mortgage-backed trusts.
 
As of December 31,
 
2014
 
2013
 
(Dollars in millions)
Assets and liabilities recorded in our consolidated balance sheets related to mortgage-backed trusts:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Trading securities:
 
 
 
 
 
 
 
Fannie Mae securities
 
$
4,790

 
 
 
$
5,660

 
Non-Fannie Mae securities
 
7,073

 
 
 
8,559

 
Total trading securities
 
11,863

 
 
 
14,219

 
Available-for-sale securities:
 
 
 
 
 
 
 
Fannie Mae securities
 
5,043

 
 
 
5,866

 
Non-Fannie Mae securities
 
22,776

 
 
 
27,441

 
Total available-for-sale securities
 
27,819

 
 
 
33,307

 
Other assets
 
111

 
 
 
119

 
Other liabilities
 
(1,440
)
 
 
 
(1,668
)
 
Net carrying amount
 
$
38,353

 
 
 
$
45,977

 
Maximum exposure to loss
 
$
45,311

 
 
 
$
54,148

 
Total assets of unconsolidated mortgage-backed trusts
 
$
253,554

 
 
 
$
313,202