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REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS 2 (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jan. 01, 2021
Jan. 01, 2020
Change in Contract with Customer, Asset and Liability [Abstract]            
Contract Assets $ 2,087 $ 1,819 $ 2,087 $ 1,819 $ 1,618 $ 1,602
Contract with Customer, Asset, Reclassified to Receivable     469 217    
Contract Liabilities (3,840) (3,666) (3,840) (3,666) $ (4,033) $ (3,501)
Contract with Customer, Liability, Change in Timeframe, Performance Obligation Satisfied, Revenue Recognized     193 (165)    
Net Change     662 52    
Contract liability, revenue recognized $ 225 $ 351 $ 1,786 $ 1,554