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VARIABLE INTEREST ENTITIES - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Nov. 02, 2015
joint_venture
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Variable Interest Entities [Abstract]            
Number of joint ventures formed as part of the Alstom acquisition | joint_venture 3          
Variable Interest Entity [Line Items]            
Combined assets   $ 5,851   $ 5,851    
Total revenues from consolidated VIEs   29,558 $ 33,494 57,219 $ 61,339  
Alstom acquisition            
Variable Interest Entity [Line Items]            
Combined assets   16,193   16,193   $ 14,460
Combined liabilities   9,006   9,006   9,922
Redeemable non-controlling interest       2,894   2,709
Consolidated VIEs            
Variable Interest Entity [Line Items]            
Combined assets   6,509   6,509   6,105
Combined liabilities   5,089   5,089   4,553
Total revenues from consolidated VIEs   256 439 508 794  
Cost of goods and services   83 $ 257 178 $ 601  
Third-party investors            
Variable Interest Entity [Line Items]            
Commingled cash owed to third-party investors   1,123   1,123   1,117
Commingled cash owed by third-party investors   10   10   5
Unconsolidated VIEs            
Variable Interest Entity [Line Items]            
Investments in unconsolidated VIEs   $ 6,210   $ 6,210   $ 6,346