LINES OF CREDIT - Letters of Credit and Surety Bonds (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Short Term Debt Other Disclosures [Abstract]
Letters of credit	$ 36	$ 35
Surety bonds	$ 130	$ 127

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant