Nominal or face amount used to calculate payment on derivative.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

DERIVATIVES AND HEDGING ACTIVITIES Schedule of Notional Amounts of Financial Instruments (Details) € in Millions, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) MWh	Dec. 31, 2020 USD ($) MWh	Sep. 30, 2021 EUR (€)	Dec. 31, 2020 EUR (€)
Cash Flow Hedging \| Foreign Exchange Contract \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	$ 108	$ 85	€ 0	€ 187
Energy Commodities and Service \| Energy Related Derivative \| Not Designated as Hedging Instrument
Derivative [Line Items]
Underlying, Derivative Energy Measure	300,000	200,000