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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMSThe 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,
(in millions)2021202020212020
Pension benefits
Service cost$22 $20 $44 $41 
Interest cost18 23 36 47 
Expected return on plan assets(36)(40)(72)(81)
Amortization of net losses and prior service costs23 19 46 38 
Net periodic pension cost$27 $22 $54 $45 
OPEB
Interest cost$1 $1 $2 $2 
Amortization of net loss and prior service credit(3)(4)(5)(8)
Net periodic OPEB cost (income)$(2)$(3)$(3)$(6)