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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Expected Credit Losses (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Allowance for expected credit losses | $ 25 | $ 30

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- Definition Receivables, Allowance For Credit Loss, Current + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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