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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Disclosure [Text Block] Employee Benefit Plans
Pension and Postretirement Plans. We sponsor both funded and unfunded domestic and foreign defined benefit pension and postretirement benefit (PRB) plans and defined contribution 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 
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 
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 $— 
We have set aside assets in separate trusts, which we expect to be used to pay for certain nonqualified defined benefit and defined contribution plan obligations in excess of qualified plan limits. These assets are included in Other assets in our Condensed Consolidated Balance Sheet. 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