COMMITMENTS, GUARANTEES, PRODUCT WARRANTIES AND OTHER LOSS CONTINGENCIES - Guarantees (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Other Commitments [Line Items]
Liabilities recorded	$ 32,677	$ 33,759
Credit Support
Other Commitments [Line Items]
Other commitments	1,525
Liability for arrangements	46
Indemnification Agreements - Continuing Operations
Other Commitments [Line Items]
Other commitments	1,455
Liabilities recorded	142
Indemnification Agreements - Discontinued Operations
Other Commitments [Line Items]
Liability for arrangements	104
Indemnification Agreements - Discontinued Operations | Maximum
Other Commitments [Line Items]
Other commitments	$ 630