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Fair Value Measurements Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]
The following table summarizes the levels of fair value measurements of our financial assets:
March 31, 2024December 31, 2023
(in millions)
TotalLevel 1Level 2TotalLevel 1Level 2
Money market funds$474 $474 $— $730 $730 $— 
U.S. Treasury bills16 16 — 16 16 — 
490 490 — 746 746 — 
Deposits - money market funds
42 42 — 22 22 — 
Total
$532 $532 $ $768 $768 $ 
Debt Securities, Available-for-sale
The following is a summary of our available-for-sale marketable securities:
(in millions)
Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
March 31, 2024
U.S. Treasury bills$16 $— $— $16 
December 31, 2023
U.S. Treasury bills$16 $— $— $16