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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2020
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)2020201920202019
US qualified and international defined benefit plans$34  $33  $42  $37  
Defined contribution plans227  117  440  252  
Schedule of Amounts Recognized in Balance Sheet
Future pension and postretirement benefit obligations on the Condensed Consolidated Balance Sheet consisted of the following:
(dollars in millions)June 30, 2020December 31, 2019
Long-term pension liabilities$13,774  $1,770  
Long-term PRB liabilities1,069  696  
Other pension and PRB related items
129  21  
Total long-term pension and PRB liabilities(1)
$14,972  $2,487  
(1)  Increase in long-term pension and PRB liabilities is primarily due to the Raytheon Merger and the remeasurement of the UTC legacy plans.
Schedule of Net Benefit Costs
The following table illustrates the components of net periodic benefit (income) cost for our defined pension and PRB plans:
 
Pension Benefits
Quarter Ended June 30,
Other Postretirement Benefits
Quarter Ended June 30,
(dollars in millions)2020201920202019
Operating expense
Service cost
$142  $74  $2  $1  
Non-operating expense
Interest cost
452  321  10  8  
Expected return on plan assets
(814) (568) (4) —  
Amortization of prior service cost (credit)
13  4  (1) (11) 
Recognized actuarial net loss (gain)
83  49  (3) (3) 
Net settlement and curtailment loss
27  —  —  —  
Non-service pension (income) cost
(239) (194) 2  (6) 
Total net periodic benefit (income) cost$(97) $(120) $4  $(5) 

 
Pension Benefits
Six Months Ended June 30,
Other Postretirement Benefits
Six Months Ended June 30,
(dollars in millions)2020201920202019
Operating expense
Service cost
$179  $146  $3  $2  
Non-operating expense
Interest cost
705  642  16  16  
Expected return on plan assets
(1,335) (1,136) (5) (1) 
Amortization of prior service cost (credit)
26  9  (2) (22) 
Recognized actuarial net loss (gain)
169  98  (6) (6) 
Net settlement and curtailment loss
27  8  —  —  
Non-service pension (income) cost
(408) (379) 3  (13) 
Total net periodic benefit (income) cost$(229) $(233) $6  $(11) 
Marketable Securities The fair value of marketable securities held in trusts consisted of the following:
(dollars in millions)June 30, 2020December 31, 2019
Marketable securities held in trusts$758  $—