PENSION AND POSTRETIREMENT BENEFIT PLANS (Fair Value Disclosures) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 6,461	$ 7,114
The percentage of employer common stock in total plan assets is less than	1.00%
Equity Securities [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 124	799
Equity Funds [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	477	1,518
Fixed Income Funds [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	606	724
Corporate Debt Securities [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	3,865	1,919
U.S. Treasury and Agency Securities [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	553	729
Short-Term Investment Funds [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	55	135
Insurance Contracts [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	134	138
Cash and Cash Equivalents [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	311	214
Other[Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	124	105
Fair Value Level 1 [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	437	1,173
Fair Value Level 1 [Member] | Equity Securities [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	124	799
Fair Value Level 1 [Member] | Equity Funds [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2	160
Fair Value Level 1 [Member] | Fixed Income Funds [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value Level 1 [Member] | Corporate Debt Securities [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value Level 1 [Member] | U.S. Treasury and Agency Securities [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value Level 1 [Member] | Short-Term Investment Funds [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value Level 1 [Member] | Insurance Contracts [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value Level 1 [Member] | Cash and Cash Equivalents [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	311	214
Fair Value Level 1 [Member] | Other[Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value Level 2 [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	5,659	4,957
Fair Value Level 2 [Member] | Equity Securities [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value Level 2 [Member] | Equity Funds [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	475	1,358
Fair Value Level 2 [Member] | Fixed Income Funds [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	606	724
Fair Value Level 2 [Member] | Corporate Debt Securities [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	3,865	1,919
Fair Value Level 2 [Member] | U.S. Treasury and Agency Securities [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	553	729
Fair Value Level 2 [Member] | Short-Term Investment Funds [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	55	135
Fair Value Level 2 [Member] | Insurance Contracts [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value Level 2 [Member] | Cash and Cash Equivalents [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value Level 2 [Member] | Other[Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	105	92
Fair Value Level 3 [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	153	151
Fair Value Level 3 [Member] | Equity Securities [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value Level 3 [Member] | Equity Funds [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value Level 3 [Member] | Fixed Income Funds [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value Level 3 [Member] | Corporate Debt Securities [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value Level 3 [Member] | U.S. Treasury and Agency Securities [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value Level 3 [Member] | Short-Term Investment Funds [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value Level 3 [Member] | Insurance Contracts [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	134	138
Fair Value Level 3 [Member] | Cash and Cash Equivalents [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Fair Value Level 3 [Member] | Other[Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	19	13
Fair Value, Inputs, Level 1, 2 and 3 [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	6,249	6,281
Fair Value Measured at Net Asset Value Per Share [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	212	833
Fair Value Measured at Net Asset Value Per Share [Member] | Equity Funds [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	488
Fair Value Measured at Net Asset Value Per Share [Member] | Other[Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	91	191
Fair Value Measured at Net Asset Value Per Share [Member] | Venture Capital and Limited Partnerships [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 121	$ 154