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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Long-term debt and current portion of long term debt, carrying value	$ 8,729	$ 8,057
Long-term debt and current portion of long-term debt, fair value	$ 9,498	$ 9,075

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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