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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS (Tables)
 9 Months Ended
Sep. 30, 2021
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
September 30,		Nine months ended
September 30,
(in millions)2021202020212020
Pension benefits
Service cost$22 $20 $66 $61 
Interest cost18 24 54 71 
Expected return on plan assets(36)(40)(108)(121)
Amortization of net losses and prior service costs23 19 69 57 
Net periodic pension cost$27 $23 $81 $68 
OPEB
Interest cost$1 $2 $3 $4 
Amortization of net loss and prior service credit(2)(5)(7)(13)
Net periodic OPEB cost (income)$(1)$(3)$(4)$(9)