RETIREMENT BENEFITS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Accumulated benefit obligation	$ 2,200	$ 2,000
Defined contribution plan expense	$ 380	360	$ 350
Equity Securities
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Investment allocation, percentage	21.00%
Debt Securities
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Investment allocation, percentage	63.00%
Total return swap contracts
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Investment allocation, percentage	16.00%
Pension Plans, Defined Benefit
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Net periodic benefit cost of defined benefit pension plans	$ 11	27	28
Benefit obligation	$ 2,238	$ 1,976	$ 2,935
Discount rate	3.40%	4.00%
Other Postretirement Benefits Plan
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Benefit obligation	$ 183	$ 187
Discount rate	4.80%	5.00%