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Employee Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Schedule of contributions to plans
Contributions to our plans were as follows:
 Quarter Ended June 30,Six Months Ended June 30,
(dollars in millions)2024202320242023
U.S. qualified defined benefit plans$ $— $ $— 
International defined benefit plans10 20 12 28 
PRB plans4 13 12 
Defined contribution plans339 317 734 689 
Schedule of Amounts Recognized in Balance Sheet
The amounts recognized in the Condensed Consolidated Balance Sheet consist of:
(dollars in millions)June 30, 2024December 31, 2023
Noncurrent pension assets (included in Other assets)$1,906 $1,296 
Current pension and PRB liabilities (included in Accrued employee compensation)270 270 
Future pension and postretirement benefit obligations2,264 2,385 
The amounts recognized in Future pension and postretirement benefit obligations consist of:
(dollars in millions)June 30, 2024December 31, 2023
Noncurrent pension liabilities$1,634 $1,737 
Noncurrent PRB liabilities568 582 
Other pension and PRB related items
62 66 
Future pension and postretirement benefit obligations$2,264 $2,385 
Schedule of Net Benefit Costs
The components of net periodic (income) expense for our defined pension and PRB plans were as follows:
 
Pension Benefits
Quarter Ended June 30,
PRB
Quarter Ended June 30,
(dollars in millions)2024202320242023
Operating expense
Service cost$47 $56 $1 $
Non-operating expense
Interest cost596 627 11 12 
Expected return on plan assets(936)(938)(5)(5)
Amortization of prior service credit(42)(40) — 
Recognized actuarial net (gain) loss5 (95)(6)(8)
 Net settlement, curtailment, and special termination benefit (gain) loss3 —  — 
Non-service pension income(374)(446) (1)
Total net periodic (income) expense$(327)$(390)$1 $— 
 
Pension Benefits
Six Months Ended June 30,
PRB
Six Months Ended June 30,
(dollars in millions)2024202320242023
Operating expense
Service cost
$94 $111 $2 $
Non-operating expense
Interest cost1,192 1,253 22 24 
Expected return on plan assets(1,873)(1,875)(10)(10)
Amortization of prior service credit(85)(79) — 
Recognized actuarial net (gain) loss10 (190)(12)(16)
Net settlement, curtailment and special termination benefit (gain) loss(4) — 
Non-service pension income(760)(889) (2)
Total net periodic (income) expense$(666)$(778)$2 $— 
Marketable Securities The fair value of marketable securities held in trusts was as follows:
(dollars in millions)June 30, 2024December 31, 2023
Marketable securities held in trusts$714 $745