INCOME TAXES Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Other postretirement benefits	$ 0	$ 18
Debt amortization	0	11
Other	0	74
Total deferred income tax assets	0	103
Deferred Tax Assets, Valuation Allowance	0	0
Deferred Tax Assets, Net	0	103
Property, plant and equipment	0	(497)
Deferred Tax Liabilities, Investment in Noncontrolled Affiliates	0	(2)
Other	0	(41)
Deferred Tax Liabilities, Gross	0	(540)
Deferred Tax Liabilities, Net	$ 0	$ (437)