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Fair Value (Tables)
 3 Months Ended
Mar. 31, 2025
Fair Value Disclosures [Abstract]  
Schedule of Fair value, by Balance Sheet Grouping
The following is a listing of our assets required to be measured at fair value on a recurring basis and where they are classified within the fair value hierarchy as of March 31, 2025 and December 31, 2024 (in millions):
March 31, 2025
Level 1Level 2Level 3Total
Assets
Cash equivalents$2,018 $— $— $2,018 
Restricted cash equivalents70 — — 70 
Available-for-sale investment securities— 1,136 9 1,145 
December 31, 2024
Level 1Level 2Level 3Total
Assets
Cash equivalents$1,921 $— $— $1,921 
Restricted cash equivalents89 — — 89 
Available-for-sale investment securities— 1,609 12 1,621 
Schedule of Debt Securities, Held-to-Maturity The carrying value and estimated fair value of our held-to-maturity investment securities were as follows (in millions):
March 31, 2025December 31, 2024
Carrying ValueFair ValueCarrying ValueFair Value
Held-to-maturity investment securities$382 $380 $404 $400