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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Summary of Net-of-Tax Amounts Recorded in OCI Relating to Pension and OPEB Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Summary of the net-of-tax amounts recorded in OCI relating to pension and OPEB plans      
Gain (loss) arising during the year, net of tax of $43 in 2021, $17 in 2020 and $(64) in 2019 $ 160 $ 59 $ (184)
Amortization of loss to earnings, net of tax of $17 in 2021, $12 in 2020 and $6 in 2019 65 47 25
Settlement charges, net of tax of $0 in 2021, $11 in 2020 and $188 in 2019 2 35 567
Pension and other employee benefits 227 141 408
Gain (loss) arising during the year, tax expense (benefit) 43 17 (64)
Amortization of loss to earnings, tax benefit 17 12 6
Settlement, tax benefit $ 0 $ 11 $ 188