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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Schedule of Contributions to Plans
Contributions to our plans were as follows:
 Quarter Ended March 31,
(dollars in millions)20252024
U.S. qualified defined benefit plans$— $— 
International defined benefit plans3 2 
PRB plans10 9 
Defined contribution plans401 395 
Schedule of Amounts Recognized in the Balance Sheet
The amounts recognized in the Condensed Consolidated Balance Sheet consist of:
(dollars in millions)March 31, 2025December 31, 2024
Non-current pension assets (included in Other assets)$2,130 $1,819 
Current pension and PRB liabilities (included in Accrued employee compensation)257 256 
Future pension and postretirement benefit obligations2,060 2,104 
The amounts recognized in Future pension and postretirement benefit obligations consist of:
(dollars in millions)March 31, 2025December 31, 2024
Non-current pension liabilities$1,493 $1,532 
Non-current PRB liabilities502 523 
Other pension and PRB related items65 49 
Future pension and postretirement benefit obligations$2,060 $2,104 
Schedule of Net Periodic Costs (Income)
The components of net periodic income for our defined pension plans were as follows:
 

Quarter Ended March 31,
(dollars in millions)20252024
Operating expense
Service cost$42 $47 
Non-operating expense
Interest cost583 596 
Expected return on plan assets(917)(937)
Amortization of prior service credit(39)(43)
Recognized actuarial net loss5 5 
 Net settlement, curtailment, and special termination benefit gain— (7)
Non-service pension income(368)(386)
Total net periodic income$(326)$(339)
Schedule of Marketable Securities The fair value of marketable securities held in trusts was as follows:
(dollars in millions)March 31, 2025December 31, 2024
Marketable securities held in trusts$682 $786