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EMPLOYEE BENEFIT PLANS - PLAN ASSETS (Details) - Qualified Defined Benefit [Member] - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Plan asset allocations 100.00% 100.00%  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Plan Assets $ 1,737,000,000 $ 1,917,000,000 $ 1,769,000,000
Level 2 [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Plan Assets $ 1,652,000,000 $ 1,917,000,000  
Equity funds [Member] | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Plan asset allocations 28.00% 33.00%  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Equities, Range Minimum 21.00%    
Equities, Range Maximum 33.00%    
Equity funds [Member] | U.S. | Level 2 [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Plan Assets $ 491,000,000 $ 634,000,000  
Equity funds [Member] | Non-U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan asset allocations 12.00% 14.00%  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Equities, Range Minimum 7.00%    
Equities, Range Maximum 17.00%    
Equity funds [Member] | Non-U.S. [Member] | Level 2 [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Plan Assets $ 208,000,000 $ 272,000,000  
Credit bond index fund [Member] | Level 2 [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Plan Assets $ 953,000,000 $ 190,000,000  
Fixed Income Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan asset allocations 55.00% 53.00%  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Equities, Range Minimum 48.00%    
Equities, Range Maximum 67.00%    
Government and credit bond index funds [Member] | Level 2 [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Plan Assets $ 0 $ 821,000,000  
Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan asset allocations 5.00% 0.00%  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Equities, Range Minimum 0.00%    
Equities, Range Maximum 8.00%    
Real Estate [Member] | Level 3 [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Plan Assets $ 85,000,000 $ 0  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings and Other Comprehensive Income (Loss) 5    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) 80    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net 0.0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 85,000,000