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Fair Value of Financial Instruments (Unaudited) (Tables)
 6 Months Ended
Jun. 30, 2017
Fair Value Disclosures [Abstract]  
Fair value information of assets and liabilities measured at fair value on a recurring basis
The following table presents the financial assets and liabilities we record at fair value on a recurring basis identified by the level of inputs used to determine fair value:
 
 
June 30, 2017
 
December 31, 2016
$ in millions
 
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
 
Total
Financial Assets (Liabilities)
 
 
 
 
 
 
 
 
 
 
 
 
Marketable securities
 
 
 
 
 
 
 
 
 
 
 
 
Trading
 
$
327

 
$
1

 
$
328

 
$
321

 
$
2

 
$
323

Available-for-sale
 
12

 
—

 
12

 
7

 
—

 
7

Derivatives
 
—

 
5

 
5

 
—

 
8

 
8