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FAIR VALUE MEASUREMENTS (Tables) | 6 Months Ended
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Jun. 30, 2025
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping | Fair values of financial instruments on the unaudited condensed consolidated balance sheets:
| June 30, 2025
(in millions) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |
U.S. government and agency securities | $ | 342 |  |  | $ | — |  |  | $ | — |  |  | $ | 342 |
Equity mutual funds | 7 |  |  | — |  |  | — |  |  | 7 |
Asset-backed securities | — |  |  | 194 |  |  | 3 |  |  | 197 |
Mortgage-backed securities | — |  |  | 197 |  |  | — |  |  | 197 |
Corporate notes and bonds | — |  |  | 615 |  |  | — |  |  | 615 |
Municipal securities and other | — |  |  | 16 |  |  | — |  |  | 16 |
Total Marketable securities | $ | 349 |  |  | $ | 1,022 |  |  | $ | 3 |  |  | $ | 1,374 |
| December 31, 2024
(in millions) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |
U.S. government and agency securities | $ | 292 |  |  | $ | — |  |  | $ | — |  |  | $ | 292 |
Equity mutual funds | 7 |  |  | — |  |  | — |  |  | 7 |
Asset-backed securities | — |  |  | 127 |  |  | 7 |  |  | 134 |
Mortgage-backed securities | — |  |  | 112 |  |  | — |  |  | 112 |
Corporate notes and bonds | — |  |  | 696 |  |  | 2 |  |  | 698 |
Municipal securities and other | — |  |  | 31 |  |  | — |  |  | 31 |
Total Marketable securities | $ | 299 |  |  | $ | 966 |  |  | $ | 9 |  |  | $ | 1,274 |
Fixed-rate debt on the unaudited condensed consolidated balance sheets and the estimated fair value of long-term fixed-rate debt:
(in millions) | June 30, 2025 |  | December 31, 2024
Fixed-rate debt | $ | 2,868 |  |  | $ | 2,946 |
Estimated fair value | $ | 2,806 |  |  | $ | 2,844 |
Schedule of Debt Investment Maturities | Maturities for marketable securities:
June 30, 2025 (in millions) | Cost Basis |  | Fair Value
Due in one year or less | $ | 285 |  |  | $ | 285 |
Due after one year through five years | 933 |  |  | 933 |
Due after five years through ten years | 144 |  |  | 144 |
Due after ten years | 6 |  |  | 5 |
No maturity date | 5 |  |  | 7 |
Total | $ | 1,373 |  |  | $ | 1,374 |

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