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FAIR VALUE MEASUREMENTS (Tables) | 3 Months Ended
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Mar. 31, 2026
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping | Fair values of financial instruments on the condensed consolidated balance sheets:
| March 31, 2026
(in millions) | Level 1 |  | Level 2 |  |  |  | Total
Marketable securities |  |  |  |  |  |  |
U.S. government and agency securities | $ | 315 |  |  | $ | — |  |  |  |  | $ | 315 |
Equity mutual funds | 8 |  |  | — |  |  |  |  | 8 |
Asset-backed securities | — |  |  | 245 |  |  |  |  | 245 |
Mortgage-backed securities | — |  |  | 186 |  |  |  |  | 186 |
Corporate notes and bonds | — |  |  | 552 |  |  |  |  | 552 |
Municipal securities and other | — |  |  | 11 |  |  |  |  | 11 |
Total Marketable securities | $ | 323 |  |  | $ | 994 |  |  |  |  | $ | 1,317 |
| December 31, 2025
(in millions) | Level 1 |  | Level 2 |  |  |  | Total
Marketable securities |  |  |  |  |  |  |
U.S. government and agency securities | $ | 371 |  |  | $ | — |  |  |  |  | $ | 371 |
Equity mutual funds | 8 |  |  | — |  |  |  |  | 8 |
Asset-backed securities | — |  |  | 231 |  |  |  |  | 231 |
Mortgage-backed securities | — |  |  | 211 |  |  |  |  | 211 |
Corporate notes and bonds | — |  |  | 663 |  |  |  |  | 663 |
Municipal securities and other | — |  |  | 12 |  |  |  |  | 12 |
Total Marketable securities | $ | 379 |  |  | $ | 1,117 |  |  |  |  | $ | 1,496 |
Fixed-rate debt on the condensed consolidated balance sheets and the estimated fair value of long-term fixed-rate debt:
(in millions) | March 31, 2026 |  | December 31, 2025
Fixed-rate debt | $ | 2,227 |  |  | $ | 2,761 |
Estimated fair value | $ | 2,207 |  |  | $ | 2,756 |
Schedule of Debt Investment Maturities | Maturities for marketable securities:
March 31, 2026 (in millions) | Cost Basis |  | Fair Value
Due in one year or less | $ | 240 |  |  | $ | 240 |
Due after one year through five years | 916 |  |  | 915 |
Due after five years through ten years | 153 |  |  | 152 |
Due after ten years | 1 |  |  | 1 |
No maturity date | 6 |  |  | 9 |
Total | $ | 1,316 |  |  | $ | 1,317 |

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