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Trading Assets and Liabilities (Tables)
 9 Months Ended
Sep. 30, 2015
Trading Assets And Liabilities [Abstract]  
Trading Assets and Liabilities
Trading assets and liabilities consisted of the following:
 
September 30, 2015
 
December 31, 2014
 
(in millions)
Trading assets:
 
 
 
U.S. Treasury
$
2,869

 
$
2,675

U.S. Government agency issued or guaranteed
10

 
3

U.S. Government sponsored enterprises(1)
156

 
45

Obligations of U.S. states and political subdivisions
572

 
591

Asset backed securities
440

 
481

Corporate and foreign bonds
5,559

 
9,681

Other securities
18

 
22

Precious metals
1,893

 
1,992

Derivatives, net
4,135

 
5,602

Total trading assets
$
15,652

 
$
21,092

Trading liabilities:
 
 
 
Securities sold, not yet purchased
$
717

 
$
683

Payables for precious metals
—

 
22

Derivatives, net
5,619

 
7,459

Total trading liabilities
$
6,336

 
$
8,164

 
(1) 
Consists of mortgage backed securities of $156 million and $45 million issued or guaranteed by the Federal National Mortgage Association ("FNMA") at September 30, 2015 and December 31, 2014, respectively.