COMMITMENTS, GUARANTEES, PRODUCT WARRANTIES AND OTHER LOSS CONTINGENCIES - Guarantees (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Other Commitments [Line Items]
Liabilities recorded	$ 22,795	$ 22,912
Credit Support
Other Commitments [Line Items]
Other commitments	1,844
Liability for arrangements	68
Indemnification Agreements - Continuing Operations
Other Commitments [Line Items]
Other commitments	1,660
Liabilities recorded	251
Liability for arrangements	7
Residual value guarantee	246
Indemnification Agreements - Discontinued Operations
Other Commitments [Line Items]
Liabilities recorded including the evaluation of risk and likelihood of making payments	295
Indemnification Agreements - Discontinued Operations | Maximum
Other Commitments [Line Items]
Other commitments	$ 2,648