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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Schedule of contributions to plans
Contributions to our plans were as follows:
 Quarter Ended September 30,Nine Months Ended September 30,
(dollars in millions)2021202020212020
U.S. qualified defined benefit plans$— $— $— $— 
International defined benefit plans8 14 29 56 
PRB plans5 8 9 8 
Defined contribution plans221 228 730 668 
Schedule of Amounts Recognized in Balance Sheet
The amounts recognized in the Condensed Consolidated Balance Sheet consist of:
(dollars in millions)September 30, 2021December 31, 2020
Noncurrent pension assets (included in Other assets)$1,389 $424 
Current pension and PRB liabilities (included in Accrued employee compensation)314 314 
Future pension and postretirement benefit obligations9,742 10,342 
The amounts recognized in Future pension and postretirement benefit obligations consist of:
(dollars in millions)September 30, 2021December 31, 2020
Noncurrent pension liabilities$8,638 $9,131 
Noncurrent PRB liabilities1,039 1,072 
Other pension and PRB related items
65 139 
Future pension and postretirement benefit obligations$9,742 $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 September 30,
PRB
Quarter Ended September 30,
(dollars in millions)2021202020212020
Operating expense
Service cost
$131 $149 $2 $2 
Non-operating expense
Interest cost
312 465 6 10 
Expected return on plan assets
(869)(827)(5)(4)
Amortization of prior service cost (credit)
(42)13 (1)(1)
Recognized actuarial net loss (gain)
109 86 (2)(3)
Net settlement, curtailment and special termination benefit loss1 8 — — 
Non-service pension (income) expense(489)(255)(2)2 
Total net periodic benefit (income) expense$(358)$(106)$— $4 
 
Pension Benefits
Nine Months Ended September 30,
PRB
Nine Months Ended September 30,
(dollars in millions)2021202020212020
Operating expense
Service cost
$393 $328 $6 $5 
Non-operating expense
Interest cost937 1,170 18 26 
Expected return on plan assets(2,608)(2,162)(15)(9)
Amortization of prior service cost (credit)
(126)39 (3)(3)
Recognized actuarial net loss (gain)
327 255 (6)(9)
Net settlement, curtailment and special termination benefit loss4 35 — — 
Non-service pension (income) expense(1,466)(663)(6)5 
Total net periodic benefit (income) expense$(1,073)$(335)$— $10 
Marketable Securities The fair value of marketable securities held in trusts was as follows:
(dollars in millions)September 30, 2021December 31, 2020
Marketable securities held in trusts$965 $881