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Fair Value Measurements Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 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:
| September 30, 2024 |  | December 31, 2023
(in millions) | Total | Level 1 | Level 2 |  | Total | Level 1 | Level 2
Money market funds | $ | 475 |  | $ | 475 |  | $ | — |  |  | $ | 730 |  | $ | 730 |  | $ | — |
U.S. Treasury bills | 16 |  | 16 |  | — |  |  | 16 |  | 16 |  | — |
| 491 |  | 491 |  | — |  |  | 746 |  | 746 |  | — |
Deposits - money market funds | 226 |  | 226 |  | — |  |  | 22 |  | 22 |  | — |
Total | $ | 717 |  | $ | 717 |  | $ | — |  |  | $ | 768 |  | $ | 768 |  | $ | — |
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
September 30, 2024 |  |  |  |
U.S. Treasury bills | $ | 16 |  | $ | — |  | $ | — |  | $ | 16 |
December 31, 2023 |  |  |  |
U.S. Treasury bills | $ | 16 |  | $ | — |  | $ | — |  | $ | 16 |

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