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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2020
Accounting Policies [Abstract]  
Schedule of marketable securities
The aggregate carrying values of our short-term and long-term investment securities consisted of the following at September 30, 2020 and December 31, 2019 (in millions):
 
September 30, 2020
 
December 31, 2019
Available-for-sale securities
 
 
 
Time deposits
$
561

 
$
325

Commercial paper
—

 
20

Debt securities
8

 
6

Total available-for-sale securities
569

 
351

Held-to-maturity securities
 
 
 
Corporate bonds
—

 
21

Total held-to-maturity securities
—

 
21

Total investment securities
$
569

 
$
372