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Fair Value of Financial Instruments (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020
 
December 31, 2019
$ in millions
 
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
 
Total
Financial Assets (Liabilities)
 
 
 
 
 
 
 
 
 
 
 
 
Marketable securities
 
$
345

 
$
1

 
$
346

 
$
364

 
$
1

 
$
365

Marketable securities valued using NAV
 
 
 
 
 
17

 
 
 
 
 
17

Total marketable securities
 
345

 
1

 
363

 
364

 
1

 
382

Derivatives
 
—

 
(1
)
 
(1
)
 
—

 
(3
)
 
(3
)