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Fair Value of Financial Instruments (Unaudited) (Tables)
 6 Months Ended
Jun. 30, 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 the company records at fair value on a recurring basis identified by the level of inputs used to determine fair value:
 
 
June 30, 2018
 
December 31, 2017
$ in millions
 
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
 
Total
Financial Assets (Liabilities)
 
 
 
 
 
 
 
 
 
 
 
 
Marketable securities
 
$
350

 
$
—

 
$
350

 
$
352

 
$
1

 
$
353

Marketable securities valued using NAV
 
—

 
—

 
14

 
—

 
—

 
—

Total marketable securities
 
350

 
—

 
364

 
352

 
1

 
353

Derivatives
 
—

 
(5
)
 
(5
)
 
—

 
—

 
—