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Derivative Financial Instruments (Details 2) MMBTU in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) MMBTU	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) MMBTU	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) MMBTU
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Notional Nonmonetary Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments | MMBTU	20.7		20.7		34.1
Percentage of Consumption Hedged by Derivatives			9.00%
Fair values of derivatives on consolidated balance sheets
Cash collateral on deposit with derivative counterparties	$ 0		$ 0		$ 0
Aggregate fair value of the derivative instruments with credit risk related contingent features in a net liability position	0		0		6,000,000
Cash collateral on deposit with derivative counterparties	0		0		0
Winter Storm Uri
Fair values of derivatives on consolidated balance sheets
Gain (Loss) on Sale of Derivatives	0	$ 0	112,000,000	$ 0
Not Designated as Hedging Instrument
Fair values of derivatives on consolidated balance sheets
Derivative Asset	15,000,000		15,000,000		1,000,000
Derivative Liability	3,000,000		3,000,000		7,000,000
Cash collateral on deposit with derivative counterparties	0		0		0
Cash collateral on deposit with derivative counterparties	0		0		0
Not Designated as Hedging Instrument | Energy Related Derivative
Fair values of derivatives on consolidated balance sheets
Derivative Asset	15,000,000		15,000,000		1,000,000
Derivative Liability	3,000,000		3,000,000		$ 7,000,000
Designated as Hedging Instrument
Fair values of derivatives on consolidated balance sheets
Derivative Asset	$ 0		$ 0

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- Definition

Aggregate notional amount of price risk derivatives not designated as a hedging instrument with notional amounts expressed in nonmonetary units.

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Percentage of an entity's commodity consumptions that is covered by a derivative.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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