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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2022
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 June 30, 2022 and December 31, 2021 (in millions):
June 30, 2022December 31, 2021
Available-for-sale investment securities
Time deposits$795 $790 
Debt securities10 8 
Commercial Paper51 2 
Total available-for-sale investment securities856 800 
Held-to-maturity investment securities
Corporate bonds120 37 
Total held-to-maturity investment securities120 37 
Equity investment securities
Common stock of publicly traded companies17 26 
Total equity investment securities17 26 
Total investment securities$993 $863