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REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS 2 (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Jan. 01, 2018
Change in Contract with Customer, Asset and Liability [Abstract]            
Contract Assets $ 1,812 $ 1,689 $ 1,812 $ 1,689 $ 1,548 $ 1,721
Change in Contract Assets - Increase (Decrease)     264 (32)    
Contract Liabilities (3,188) (3,165) (3,188) (3,165) $ (3,378) $ (2,973)
Change in Contract Liabilities - (Increase) Decrease     190 (192)    
Net Change     454 (224)    
Contract liability, revenue recognized $ 215 $ 122 $ 1,195 $ 1,023