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PENSION PLANS AND OTHER POST RETIREMENT BENEFITS (Fair Value of Level 3 Pension Plan Assets) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Pension Plan, Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets, Beginning $ 3,097  
Fair Value of Plan Assets, Ending 3,307 $ 3,097
Defined Benefit Pension Plans [Member]    
Pension Plan, Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets, Beginning 3,097 3,173
Fair Value of Plan Assets, Ending 3,307 3,097
Defined Benefit Pension Plans [Member] | Fair Value, Inputs, Level 3 [Member]    
Pension Plan, Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets, Beginning 749 747
Relating to assets held during the period 4 (34)
Relating to assets sold during the period 25 31
Purchases, sales, and settlements (6) 5
Fair Value of Plan Assets, Ending 772 749
Defined Benefit Pension Plans [Member] | Equity Securities [Member]    
Pension Plan, Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets, Beginning 547  
Fair Value of Plan Assets, Ending 846 547
Defined Benefit Pension Plans [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Pension Plan, Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets, Beginning 6 5
Relating to assets held during the period 0 1
Relating to assets sold during the period 0 0
Purchases, sales, and settlements 1 0
Fair Value of Plan Assets, Ending 7 6
Defined Benefit Pension Plans [Member] | Fixed Income Securities [Member]    
Pension Plan, Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets, Beginning 1,438  
Fair Value of Plan Assets, Ending 1,412 1,438
Defined Benefit Pension Plans [Member] | Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Pension Plan, Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets, Beginning 0  
Fair Value of Plan Assets, Ending 0 0
Defined Benefit Pension Plans [Member] | Alternative Investments [Member]    
Pension Plan, Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets, Beginning 873  
Fair Value of Plan Assets, Ending 863 873
Defined Benefit Pension Plans [Member] | Alternative Investments [Member] | Fair Value, Inputs, Level 3 [Member]    
Pension Plan, Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets, Beginning 724 720
Relating to assets held during the period 4 (37)
Relating to assets sold during the period 25 39
Purchases, sales, and settlements 12 2
Fair Value of Plan Assets, Ending 765 724
Defined Benefit Pension Plans [Member] | Other Investment Plan Assets [Member] | Fair Value, Inputs, Level 3 [Member]    
Pension Plan, Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets, Beginning 19 22
Relating to assets held during the period 0 2
Relating to assets sold during the period 0 (8)
Purchases, sales, and settlements (19) 3
Fair Value of Plan Assets, Ending 0 19
Defined Benefit Pension Plans [Member] | Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Pension Plan, Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets, Beginning $ 77  
Fair Value of Plan Assets, Ending   77
Restatement Adjustment [Member] | Defined Benefit Pension Plans [Member] | Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Pension Plan, Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value of Plan Assets, Beginning   $ 51