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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Fair value of assets and liabilities measured 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. See Note 1 for the definitions of these levels.
 
 
December 31, 2018
 
December 31, 2017
$ in millions
 
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
 
Total
Financial Assets (Liabilities)
 
 
 
 
 
 
 
 
 
 
 
 
Marketable securities
 
$
319

 
$
1

 
$
320

 
$
352

 
$
1

 
$
353

Marketable securities valued using NAV
 
—

 
—

 
15

 
—

 
—

 
—

Total marketable securities
 
319

 
1

 
335

 
352

 
1

 
353

Derivatives
 
—

 
(10
)
 
(10
)
 
—

 
—

 
—