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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Schedule of contributions to plans
Contributions to our plans were as follows:
 Quarter Ended March 31,
(dollars in millions)20212020
U.S. qualified defined benefit plans$— $— 
International defined benefit plans7 8 
PRB plans— — 
Defined contribution plans271 213 
Schedule of Amounts Recognized in Balance Sheet
Future pension and postretirement benefit obligations on the Condensed Consolidated Balance Sheet consists of the following:
(dollars in millions)March 31, 2021December 31, 2020
Long-term pension liabilities$8,669 $9,131 
Long-term PRB liabilities1,073 1,072 
Other pension and PRB related items
66 139 
Total long-term pension and PRB liabilities$9,808 $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 March 31,
PRB
Quarter Ended March 31,
(dollars in millions)2021202020212020
Operating expense
Service cost
$131 $37 $2 $1 
Non-operating expense
Interest cost
312 253 6 6 
Expected return on plan assets
(868)(521)(5)(1)
Amortization of prior service cost (credit)
(42)13 (1)(1)
Recognized actuarial net loss (gain)
109 86 (2)(3)
Net settlement and curtailment loss (gain)— — — — 
Non-service pension (income) expense(489)(169)(2)1 
Total net periodic benefit (income) expense$(358)$(132)$— $2 
Marketable Securities The fair value of marketable securities held in trusts consisted of the following:
(dollars in millions)March 31, 2021December 31, 2020
Marketable securities held in trusts$879 $881