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COMMITMENTS, GUARANTEES, PRODUCT WARRANTIES AND OTHER LOSS CONTINGENCIES - COMMITMENTS (Narrative) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2017
USD ($)
GECAS | New aircraft  
Long-term Purchase Commitment [Line Items]  
List prices of multiple-year orders $ 38,669
GECAS | Used aircraft  
Long-term Purchase Commitment [Line Items]  
List prices of multiple-year orders 2,077
Aviation  
Long-term Purchase Commitment [Line Items]  
Commitment to provide financing assistance $ 1,875