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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Net Periodic Benefit Cost and Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income for All Significant Plans) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Net periodic benefit cost $ (205) $ (123) $ 676
Defined Benefit Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 396 520 506
Interest cost 921 886 883
Expected return on plan assets (1,679) (1,644) (1,548)
Amortization of prior service credit (20) (24) (25)
Amortization of unrecognized (gain) loss 574 642 638
Curtailment/settlement/other (27) 0 683
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Including Discontinued Operations 165 380 1,137
Net periodic benefit cost 144 279 1,032
Net (gain) loss (1,606) (584) (845)
Prior service cost (credit) 0 17 14
Net (gain) loss (574) (642) (638)
Prior service cost 20 24 25
Settlement loss 27 0 (687)
Total recognized in other comprehensive (income) loss 967 (17) (441)
Total recognized in net periodic benefit cost and other comprehensive (income) loss 1,132 363 696
Other Postretirement Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Divestiture 0 0  
Service cost 8 12 14
Interest cost 49 45 54
Expected return on plan assets 0 0 0
Amortization of prior service credit 0 0 0
Amortization of unrecognized (gain) loss (20) (24) (6)
Curtailment/settlement/other (3) 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Including Discontinued Operations 34 33 62
Net periodic benefit cost 34 30 59
Net (gain) loss (145) 13 199
Prior service cost (credit) 0 0 0
Net (gain) loss 20 24 6
Prior service cost 0 0 0
Settlement loss 3 0 0
Total recognized in other comprehensive (income) loss 168 11 (193)
Total recognized in net periodic benefit cost and other comprehensive (income) loss 202 44 (131)
Discontinued Operations [Member] | Defined Benefit Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Funded (Unfunded) Status of Plan 0 (254)  
Defined Benefit Plan, Plan Assets, Divestiture (61) 0  
Net periodic benefit cost 21 101 105
Transfer of Business Under Common Control - Before Tax (112) 0 0
Discontinued Operations [Member] | Other Postretirement Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Funded (Unfunded) Status of Plan 0 0  
Net periodic benefit cost 0 3 3
Transfer of Business Under Common Control - Before Tax $ 0 $ 0 $ 0