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Consolidations and Transfers of Financial Assets (Tables)
12 Months Ended
Dec. 31, 2013
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 of December 31, 2013 and 2012, as well as our maximum exposure to loss and the total assets of these unconsolidated mortgage-backed trusts.
 
As of December 31,
 
2013
 
2012(1)
 
(Dollars in millions)
Assets and liabilities recorded in our consolidated balance sheets related to mortgage-backed trusts:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Trading securities:
 
 
 
 
 
 
 
Fannie Mae securities
 
$
5,660

 
 
 
$
6,248

 
Non-Fannie Mae securities
 
8,559

 
 
 
16,458

 
Total trading securities
 
14,219

 
 
 
22,706

 
Available-for-sale securities:
 
 
 
 
 
 
 
Fannie Mae securities
 
5,866

 
 
 
10,435

 
Non-Fannie Mae securities
 
27,441

 
 
 
46,569

 
Total available-for-sale securities
 
33,307

 
 
 
57,004

 
Other assets
 
119

 
 
 
145

 
Other liabilities
 
(1,668
)
 
 
 
(1,449
)
 
Net carrying amount
 
$
45,977

 
 
 
$
78,406

 
Maximum exposure to loss(2)
 
$
54,148

 
 
 
$
87,397

 
Total assets of unconsolidated mortgage-backed trusts
 
$
313,202

 
 
 
$
645,332

 
__________
(1) 
Contains securities recognized in our consolidated balance sheets due to consolidation of certain multi-class resecuritization trusts.
(2) 
Our maximum exposure to loss generally represents the greater of our recorded investment in the entity or the unpaid principal balance of the assets covered by our guaranty. However, our securities issued by Fannie Mae multi-class resecuritization trusts that are not consolidated do not give rise to any additional exposure to loss as we already consolidate the underlying collateral.
Key Characteristics of the Securities Retained in Unconsolidated Portfolio Securitization Trusts [Table Text Block]
The following table displays some key characteristics of the securities retained in unconsolidated portfolio securitization trusts as of December 31, 2013 and 2012.
 
Fannie Mae Single-class MBS & Fannie Megas
 
REMICS & SMBS
 
(Dollars in millions)
As of December 31, 2013
 
 
 
 
 
Unpaid principal balance
$
349

 
 
$
6,899

 
Fair value
383

 
 
7,959

 
Weighted-average coupon
6.21

%
 
5.36

%
Weighted-average loan age
7.4

years
 
5.4

years
Weighted-average maturity
21.5

years
 
12.6

years
 
 
 
 
 
 
As of December 31, 2012
 
 
 
 
 
Unpaid principal balance
$
456

 
 
$
8,667

 
Fair value
504

 
 
9,818

 
Weighted-average coupon
6.20

%
 
5.53

%
Weighted-average loan age
6.4

years
 
4.6

years
Weighted-average maturity
22.5

years
 
15.0

years