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RETIREMENT BENEFITS - Schedule Of Accumulated And Projected Benefit Obligation In Excess Of Fair Value Of Plan Assets (Details) - Pension Plans, Defined Benefit - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]    
Projected benefit obligation $ 1,274 $ 1,805
Fair value of plan assets 836 1,162
Accumulated benefit obligation 1,245 1,579
Fair value of plan assets $ 832 $ 952