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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2021
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)2021202020212020
U.S. qualified defined benefit plans$— $— $— $— 
International defined benefit plans14 34 21 42 
PRB plans4 — 4 — 
Defined contribution plans238 227 509 440 
Schedule of Amounts Recognized in Balance Sheet
The amounts recognized in the Condensed Consolidated Balance Sheet consist of:
(dollars in millions)June 30, 2021December 31, 2020
Noncurrent pension assets (included in Other assets)$1,069 $424 
Current pension and PRB liabilities (included in Accrued employee compensation)314 314 
Future pension and postretirement benefit obligations9,929 10,342 
The amounts recognized in Future pension and postretirement benefit obligations consist of:
(dollars in millions)June 30, 2021December 31, 2020
Noncurrent pension liabilities$8,805 $9,131 
Noncurrent PRB liabilities1,058 1,072 
Other pension and PRB related items
66 139 
Future pension and postretirement benefit obligations$9,929 $10,342 
Schedule of Net Benefit Costs
The following table illustrates the components of net periodic benefit (income) expense for our defined pension and PRB plans:
 
Pension Benefits
Quarter Ended June 30,
PRB
Quarter Ended June 30,
(dollars in millions)2021202020212020
Operating expense
Service cost
$131 $142 $2 $2 
Non-operating expense
Interest cost
313 452 6 10 
Expected return on plan assets
(871)(814)(5)(4)
Amortization of prior service cost (credit)
(42)13 (1)(1)
Recognized actuarial net loss (gain)
109 83 (2)(3)
Net settlement, curtailment and special termination benefit loss3 27 — — 
Non-service pension (income) expense(488)(239)(2)2 
Total net periodic benefit (income) expense$(357)$(97)$— $4 
 
Pension Benefits
Six Months Ended June 30,
PRB
Six Months Ended June 30,
(dollars in millions)2021202020212020
Operating expense
Service cost
$262 $179 $4 $3 
Non-operating expense
Interest cost625 705 12 16 
Expected return on plan assets(1,739)(1,335)(10)(5)
Amortization of prior service cost (credit)
(84)26 (2)(2)
Recognized actuarial net loss (gain)
218 169 (4)(6)
Net settlement, curtailment and special termination benefit loss3 27 — — 
Non-service pension (income) expense(977)(408)(4)3 
Total net periodic benefit (income) expense$(715)$(229)$— $6 
Marketable Securities The fair value of marketable securities held in trusts was as follows:
(dollars in millions)June 30, 2021December 31, 2020
Marketable securities held in trusts$908 $881