DERIVATIVE FINANCIAL INSTRUMENTS - Summary of Potential Effect of Offsetting Derivatives (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivative assets
Gross Amounts of Recognized Assets/Liabilities	$ 28	$ 12
Gross Amounts Offset on our Condensed Consolidated Balance Sheets	0	0
Amounts of Assets/Liabilities Presented on our Condensed Consolidated Balance Sheets	28	12
Derivative Financial Instruments	(19)	(12)
Cash Collateral Received/ Pledged	0	0
Net Amount (Legal Offset)	9	0
Derivative liabilities
Gross Amounts of Recognized Assets/Liabilities	(30)	(121)
Gross Amounts Offset on our Condensed Consolidated Balance Sheets	0	0
Amounts of Assets/Liabilities Presented on our Condensed Consolidated Balance Sheets	(30)	(121)
Derivative Financial Instruments	19	12
Cash Collateral Received/ Pledged	0	0
Net Amount (Legal Offset)	$ (11)	$ (109)

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