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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS (Tables)
6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost Relating to Pension and Other Postemployment Employee Benefit Plans
The following is a summary of net periodic benefit cost relating to our pension and OPEB plans.
Three months ended
June 30,
Six months ended
June 30,
As RestatedAs Restated
(in millions)2020201920202019
Pension benefits
Service cost$20  $20  $41  $38  
Interest cost23  43  47  90  
Expected return on plan assets(40) (68) (81) (140) 
Amortization of net losses and prior service costs19  14  38  29  
Net periodic pension benefit cost$22  $ $45  $17  
OPEB
Interest cost$ $ $ $ 
Amortization of net loss and prior service credit(4) (7) (8) (14) 
Net periodic OPEB cost (income)$(3) $(5) $(6) $(10)