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Trading Assets and Liabilities (Tables)
 3 Months Ended
Mar. 31, 2016
Trading Assets And Liabilities [Abstract]  
Trading Assets and Liabilities
Trading assets and liabilities consisted of the following:
 
March 31, 2016
 
December 31, 2015
 
(in millions)
Trading assets:
 
 
 
U.S. Treasury
$
3,646

 
$
3,088

U.S. Government agency issued or guaranteed
12

 
13

U.S. Government sponsored enterprises(1)
154

 
154

Obligations of U.S. states and political subdivisions
550

 
559

Asset backed securities
404

 
424

Corporate and foreign bonds
7,185

 
6,899

Other securities
14

 
18

Precious metals
1,194

 
780

Derivatives, net
5,107

 
5,150

Total trading assets
$
18,266

 
$
17,085

Trading liabilities:
 
 
 
Securities sold, not yet purchased
$
654

 
$
399

Payables for precious metals
241

 
650

Derivatives, net
7,893

 
6,406

Total trading liabilities
$
8,788

 
$
7,455

 
(1) 
Consists of mortgage backed securities of $154 million issued or guaranteed by the Federal National Mortgage Association ("FNMA") at both March 31, 2016 and December 31, 2015.