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SHAREOWNERS’ EQUITY - Changes to Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Redeemable Noncontrolling Interest      
Balance at beginning of period $ 3,391 $ 3,017 $ 3,017
Net earnings (loss) (33) (109)  
Dividends (13) (10)  
Redemption value adjustment 65 101  
Other 139 47  
Balance at end of period 3,549 3,046 3,391
Alstom Acquisition      
Redeemable Noncontrolling Interest      
Balance at end of period   $ 2,760  
Alstom Acquisition      
Redeemable Noncontrolling Interest      
Noncontrolling interest in joint ventures $ 3,208   $ 3,065