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REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS 2 (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Jan. 01, 2018
Change in Contract with Customer, Asset and Liability [Abstract]            
Contract Assets $ 1,777 $ 1,650 $ 1,777 $ 1,650 $ 1,548 $ 1,721
Change in Contract Assets - Increase (Decrease)     229 (71)    
Contract Liabilities (3,237) (3,109) (3,237) (3,109) $ (3,378) $ (2,973)
Change in Contract Liabilities - (Increase) Decrease     141 (136)    
Net Change     370 (207)    
Contract liability, revenue recognized $ 260 $ 320 $ 980 $ 901