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REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS 2 (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jan. 01, 2021
Jan. 01, 2020
Change in Contract with Customer, Asset and Liability [Abstract]            
Contract Assets $ 1,868 $ 1,760 $ 1,868 $ 1,760 $ 1,618 $ 1,602
Contract with Customer, Asset, Reclassified to Receivable     250 158    
Contract Liabilities (3,740) (3,574) (3,740) (3,574) $ (4,033) $ (3,501)
Contract with Customer, Liability, Change in Timeframe, Performance Obligation Satisfied, Revenue Recognized     293 (73)    
Net Change     543 85    
Contract liability, revenue recognized $ 441 $ 315 $ 1,561 $ 1,203