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FAIR VALUE MEASUREMENTS (Tables) | 3 Months Ended
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Mar. 31, 2025
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping | Fair values of financial instruments on the unaudited condensed consolidated balance sheets:
| March 31, 2025
(in millions) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |
Marketable securities |  |  |  |  |  |  |
U.S. government and agency securities | $ | 311 |  |  | $ | — |  |  | $ | — |  |  | $ | 311 |
Equity mutual funds | 7 |  |  | — |  |  | — |  |  | 7 |
Asset-backed securities | — |  |  | 170 |  |  | 3 |  |  | 173 |
Mortgage-backed securities | — |  |  | 174 |  |  | — |  |  | 174 |
Corporate notes and bonds | — |  |  | 737 |  |  | — |  |  | 737 |
Municipal securities and other | — |  |  | 18 |  |  | — |  |  | 18 |
Total Marketable securities | $ | 318 |  |  | $ | 1,099 |  |  | $ | 3 |  |  | $ | 1,420 |
| 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) | March 31, 2025 |  | December 31, 2024
Fixed-rate debt | $ | 2,851 |  |  | $ | 2,946 |
Estimated fair value | $ | 2,790 |  |  | $ | 2,844 |
Schedule of Debt Investment Maturities | Maturities for marketable securities:
March 31, 2025 (in millions) | Cost Basis |  | Fair Value
Due in one year or less | $ | 427 |  |  | $ | 427 |
Due after one year through five years | 858 |  |  | 851 |
Due after five years through ten years | 132 |  |  | 130 |
Due after ten years | 6 |  |  | 6 |
No maturity date | 5 |  |  | 6 |
Total | $ | 1,428 |  |  | $ | 1,420 |

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