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Debt (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2025
Debt Disclosure [Abstract] |
Long-Term Debt |
|  | June 30, |  |  | December 31, |
|  | 2025 |  |  | 2024 |
|  | (Dollars in Millions) |
7% Debentures, due 2025 |  |  | 125 |  |  |  | 125 |
3.450% Senior Notes, due 2027 |  |  | 299 |  |  |  | 299 |
3.500% Senior Notes, due 2027 |  |  | 493 |  |  |  | 493 |
2.500% Senior Notes, due 2030 |  |  | 473 |  |  |  | 472 |
2.400% Senior Notes, due 2031 |  |  | 891 |  |  |  | 890 |
5.150% Senior Notes, due 2034 |  |  | 738 |  |  |  | 738 |
6.25% Senior Notes, due 2037 |  |  | 228 |  |  |  | 228 |
4.250% Senior Notes, due 2047 |  |  | 591 |  |  |  | 591 |
3.200% Senior Notes, due 2051 |  |  | 851 |  |  |  | 851 |
5.500% Senior Notes, due 2054 |  |  | 727 |  |  |  | 726 |
Total debt |  |  | 5,416 |  |  |  | 5,413 |
Less: current maturities |  |  | (125 | ) |  |  | (125 | )
Long-term debt |  | $ | 5,291 |  |  | $ | 5,288 |

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