RETIREMENT BENEFITS - Fair Value of Pension Plan Assets by Asset Category (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	$ 2,027	$ 2,815
Level 1
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	44	91
Level 1 | Equity securities
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	1	44
Level 1 | Equity funds
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	0	0
Level 1 | Fixed income funds
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	0	0
Level 1 | Corporate debt securities
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	0	0
Level 1 | U.S. Treasury and agency securities
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	0	0
Level 1 | Insurance contracts
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	0	0
Level 1 | Cash and cash equivalents
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	43	47
Level 1 | Other
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	0	0
Level 2
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	1,531	2,216
Level 2 | Equity securities
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	0	0
Level 2 | Equity funds
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	368	625
Level 2 | Fixed income funds
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	697	815
Level 2 | Corporate debt securities
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	376	485
Level 2 | U.S. Treasury and agency securities
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	75	67
Level 2 | Insurance contracts
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	0	0
Level 2 | Cash and cash equivalents
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	0	0
Level 2 | Other
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	15	224
Level 3
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	158	172
Level 3 | Equity securities
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	0	0
Level 3 | Equity funds
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	0	0
Level 3 | Fixed income funds
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	0	0
Level 3 | Corporate debt securities
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	0	0
Level 3 | U.S. Treasury and agency securities
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	0	0
Level 3 | Insurance contracts
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	123	130
Level 3 | Cash and cash equivalents
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	0	0
Level 3 | Other
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	35	42
Fair Value, Inputs, Level 1, 2 and 3
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	1,733	2,479
Fair Value, Inputs, Level 1, 2 and 3 | Equity securities
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	1	44
Fair Value, Inputs, Level 1, 2 and 3 | Equity funds
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	368	625
Fair Value, Inputs, Level 1, 2 and 3 | Fixed income funds
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	697	815
Fair Value, Inputs, Level 1, 2 and 3 | Corporate debt securities
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	376	485
Fair Value, Inputs, Level 1, 2 and 3 | U.S. Treasury and agency securities
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	75	67
Fair Value, Inputs, Level 1, 2 and 3 | Insurance contracts
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	123	130
Fair Value, Inputs, Level 1, 2 and 3 | Cash and cash equivalents
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	43	47
Fair Value, Inputs, Level 1, 2 and 3 | Other
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	50	266
Plan assets measured at NAV as a practical expedient | Plan assets measured at NAV as a practical expedient
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Fair value of pension and postretirement plan asset	$ 294	$ 336