INCOME TAXES - NET OPERATING LOSSES AND TAX CREDIT CARRYFORWARDS (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Valuation allowances	$ 144	$ 164
U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
NOLs	3,475
Valuation allowances	90	109
U.S. Federal [Member] | General business tax credits [Member]
Operating Loss Carryforwards [Line Items]
Tax credits	433
U.S. Federal [Member] | Foreign tax credits [Member]
Operating Loss Carryforwards [Line Items]
Tax credits	624
U.S. state [Member]
Operating Loss Carryforwards [Line Items]
NOLs	3,025
Valuation allowances	33	35
U.S. state [Member] | General business tax credits [Member]
Operating Loss Carryforwards [Line Items]
Tax credits	90
Non-U.S. [Member]
Operating Loss Carryforwards [Line Items]
NOLs	115
Valuation allowances	$ 21	$ 20