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Fair Value (Tables)
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Fair value, by balance sheet grouping
The following is a listing of our assets and liabilities required to be measured at fair value on a recurring basis and where they are classified within the fair value hierarchy as of June 30, 2021 and December 31, 2020 (in millions):
June 30, 2021
Level 1Level 2Level 3Total
Assets
Cash equivalents$1,740 $100 $— $1,840 
Available-for-sale investment securities— 1,318 — 1,318 
December 31, 2020
Level 1Level 2Level 3Total
Assets
Cash equivalents$1,330 $130 $— $1,460 
Available-for-sale investment securities— 1,137 — 1,137 
Refer to Note 3 to our condensed consolidated financial statements for fair value information related to our outstanding debt obligations as of June 30, 2021 and December 31, 2020.