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Fair Value of Financial Instruments (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2019
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:
 
 
September 30, 2019
 
December 31, 2018
$ in millions
 
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
 
Total
Financial Assets (Liabilities)
 
 
 
 
 
 
 
 
 
 
 
 
Marketable securities
 
$
351

 
$
—

 
$
351

 
$
319

 
$
1

 
$
320

Marketable securities valued using NAV
 
 
 
 
 
16

 
 
 


 
15

Total marketable securities
 
351

 
—

 
367

 
319

 
1

 
335

Derivatives
 
—

 
(5
)
 
(5
)
 
—

 
(10
)
 
(10
)