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Consolidations and Transfers of Financial Assets (Tables)
12 Months Ended
Dec. 31, 2018
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 securitization trusts.
 
As of December 31,
 
2018
 
2017
 
(Dollars in millions)
Assets and liabilities recorded in our consolidated balance sheets related to mortgage-backed trusts:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Trading securities:
 
 
 
 
 
 
 
Fannie Mae
 
$
1,422

 
 
 
$
3,809

 
Non-Fannie Mae
 
4,809

 
 
 
1,580

 
Total trading securities
 
6,231

 
 
 
5,389

 
Available-for-sale securities:
 
 
 
 
 
 
 
Fannie Mae
 
1,704

 
 
 
2,032

 
Non-Fannie Mae
 
1,207

 
 
 
2,062

 
Total available-for-sale securities
 
2,911

 
 
 
4,094

 
Other assets
 
66

 
 
 
74

 
Other liabilities
 
(101
)
 
 
 
(467
)
 
Net carrying amount
 
$
9,107

 
 
 
$
9,090