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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Schedule of contributions to plans
Contributions to our plans were as follows:
 Quarter Ended March 31,
(dollars in millions)20222021
U.S. qualified defined benefit plans$— $— 
International defined benefit plans12 7 
PRB plans5 — 
Defined contribution plans311 271 
Schedule of Amounts Recognized in Balance Sheet
The amounts recognized in the Condensed Consolidated Balance Sheet consist of:
(dollars in millions)March 31, 2022December 31, 2021
Noncurrent pension assets (included in Other assets)$3,538 $3,214 
Current pension and PRB liabilities (included in Accrued employee compensation)310 310 
Future pension and postretirement benefit obligations7,709 7,855 
The amounts recognized in Future pension and postretirement benefit obligations consist of:
(dollars in millions)March 31, 2022December 31, 2021
Noncurrent pension liabilities$6,748 $6,873 
Noncurrent PRB liabilities898 903 
Other pension and PRB related items
63 79 
Future pension and postretirement benefit obligations$7,709 $7,855 
Schedule of Net Benefit Costs
The components of net periodic benefit (income) expense for our defined pension and PRB plans were as follows:
 
Pension Benefits
Quarter Ended March 31,
PRB
Quarter Ended March 31,
(dollars in millions)2022202120222021
Operating expense
Service cost
$118 $131 $2 $2 
Non-operating expense
Interest cost
382 312 7 6 
Expected return on plan assets
(890)(868)(5)(5)
Amortization of prior service credit(42)(42)— (1)
Recognized actuarial net loss (gain)
77 109 (3)(2)
Net settlement, curtailment and special termination benefit gain(6)— — — 
Non-service pension income(479)(489)(1)(2)
Total net periodic benefit (income) expense$(361)$(358)$1 $— 
Marketable Securities The fair value of marketable securities held in trusts was as follows:
(dollars in millions)March 31, 2022December 31, 2021
Marketable securities held in trusts$857 $965