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REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS 2 (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Jan. 01, 2018
Change in Contract with Customer, Asset and Liability [Abstract]        
Contract Assets $ 1,700 $ 1,672 $ 1,548 $ 1,721
Change in Contract Assets - Increase (Decrease) 152 (49)    
Contract Liabilities (3,426) (3,081) $ (3,378) $ (2,973)
Change in Contract Liabilities - (Increase) Decrease (48) (108)    
Net Change 104 (157)    
Contract liability, revenue recognized $ 720 $ 581