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Fair Value of Financial Instruments (Unaudited) (Tables)
 3 Months Ended
Mar. 31, 2018
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:
 
 
March 31, 2018
 
December 31, 2017
$ in millions
 
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
 
Total
Financial Assets (Liabilities)
 
 
 
 
 
 
 
 
 
 
 
 
Marketable securities
 
$
347

 
$
1

 
$
348

 
$
352

 
$
1

 
$
353

Derivatives
 
—

 
1

 
1

 
—

 
—

 
—