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v3.25.1

Fair Value Measurements Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2025
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, 2025 |  | December 31, 2024
(in millions) | Total | Level 1 |  |  | Total | Level 1 |
Money market funds | $ | 568 |  | $ | 568 |  |  |  | $ | 1,048 |  | $ | 1,048 |  |
U.S. Treasury bills | 17 |  | 17 |  |  |  | 16 |  | 16 |  |
| 585 |  | 585 |  |  |  | 1,064 |  | 1,064 |  |
Deposits - money market funds | 242 |  | 242 |  |  |  | 241 |  | 241 |  |
Total | $ | 827 |  | $ | 827 |  |  |  | $ | 1,305 |  | $ | 1,305 |  |
Debt Securities, Available-for-sale | The following is a summary of our available-for-sale marketable securities:
(in millions) | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value
March 31, 2025 |  |  |  |
U.S. Treasury bills | $ | 17 |  | $ | — |  | $ | — |  | $ | 17 |
December 31, 2024 |  |  |  |
U.S. Treasury bills | $ | 16 |  | $ | — |  | $ | — |  | $ | 16 |

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