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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2025
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Investment Assets
The Company's investment assets are carried at fair value on the consolidated balance sheets, within the line items short-term investments and other long-term assets, as summarized in the following table.
December 2025December 2024
(Dollars in Millions)Level 1Level 2TotalLevel 1Level 2Total
Exchange-traded Funds$5 $— $5 $2 $— $2 
Corporate Bonds— 82 82 — 71 71 
Government Securities— 71 71 — 42 42 
Asset-backed Securities
— 29 29 — 35 35 
Time Deposits— — — — 66 66 
Total Investments at Fair Value$5 $182 $187 $2 $214 $216 
Schedule of Investment Maturities These investments have the following maturities:
(Dollars in Millions)December 2025December 2024
Less than 1 year$5 $72 
1 - 5 years94 72 
5 - 10 years42 23 
Greater than 10 years41 47 
Total Investments at Fair Value (a)
$182 $214 
(a) Exchange-traded funds are excluded as there is no stated contractual maturity date.
Schedule of Fair Value and Carrying Value of Long-term Debt
The fair value and carrying value of the Company's long-term debt is as follows:
(Dollars in Millions)December 2025December 2024
Long-term Debt (Including Current Maturities):  
Fair Value$17,305 $16,481 
Carrying Value18,873 18,503 
Schedule of Pension Plan Assets at Fair Value by Level
The pension plan assets at fair value by level, within the fair value hierarchy, as of calendar plan years 2025 and 2024 are shown in the table below. For additional information related to pension assets, see Note 9, Employee Benefit Plans.
 December 2025December 2024
(Dollars in Millions)Level 1Level 2TotalLevel 1Level 2Total
Common Stock$103 $— $103 $171 $— $171 
Exchange-Traded Funds
37 — 37 — — — 
Mutual Funds35 — 35 32 — 32 
Cash and Cash Equivalents142 — 142 514 — 514 
Corporate Bonds— 728 728 — 680 680 
Government Securities— 674 674 — 260 260 
Asset-backed Securities, Derivatives and Other— 15 15 — 14 14 
Total Investments in the Fair Value Hierarchy$317 $1,417 $1,734 $717 $954 $1,671 
Investments Measured at Net Asset Value (a)
n/an/a$740 n/an/a$738 
Investments at Fair Value$317 $1,417 $2,474 $717 $954 $2,409 
(a) Investments measured at net asset value represent certain investments that have been measured at net asset value per share (or its equivalent) and thus are not classified in the fair value hierarchy. The fair value amounts presented in this table are shown to permit reconciliation of the fair value hierarchy to the pension assets disclosed in Note 9, Employee Benefit Plans.