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INVESTMENTS (Tables)
3 Months Ended
Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract]  
Schedule of Financial Instruments by Significant Categories and Fair Value Measurement on a Recurring Basis
The following tables summarize our financial instruments by significant categories and fair value measurement on a recurring basis as of March 31, 2026 and December 31, 2025 and the amortized cost, gross unrealized gains, gross unrealized losses and fair value of our AFS investments:
(in millions)Fair Value LevelAmortized CostGross Unrealized GainsGross Unrealized LossesFair ValueCash and Cash EquivalentsRestricted Cash, Cash Equivalents and Investments
March 31, 2026
Cash equivalents:
Money market mutual fundsLevel 1$198 $ $ $198 $92 $106 
U.S. treasuriesLevel 210   10  10 
Total cash equivalents208   20892 116 
AFS Investments:
Corporate bondsLevel 230   30  30 
Agency securitiesLevel 211   11  11 
U.S. treasuriesLevel 2151 1 (1)151  151 
Total AFS Investments$192 $1 $(1)$192 $ $192 
(in millions)Fair Value LevelAmortized CostGross Unrealized GainsGross Unrealized LossesFair ValueCash and Cash EquivalentsRestricted Cash, Cash Equivalents and Investments
December 31, 2025
Cash equivalents:
Money market mutual fundsLevel 1$483 $— $— $483 $96 $387 
U.S. treasuriesLevel 2— — 2— 
Total cash equivalents485 — — 48596 389 
AFS Investments:
Corporate bondsLevel 234 — — 34 — 34 
Agency securitiesLevel 211 — — 11 — 11 
U.S. treasuriesLevel 2160 — 162 — 162 
Total AFS Investments$205 $$— $207 $— $207 
Schedule of Fair value of Debt Investments by Contractual Maturity
The fair value of debt investments by contractual maturity are shown below:
(in millions)March 31, 2026
One year or less$10 
Over one year through five years177 
Over five years through ten years5 
Total fair value$192 
Schedule of Available-for-Sale Securities
The gross proceeds from sales and maturities of AFS securities and gross realized losses for the three months ended March 31, 2026 and 2025 are presented below. We had immaterial gross realized gains from sales of investments for the three months ended March 31, 2026 and 2025.

Three Months Ended March 31,
(in millions)
2026
2025
Gross realized losses$ $(1)
Gross proceeds from sales37 31 
Gross proceeds from maturities1