Derivative Instruments and Hedging Activities - Commodity Purchases (Details) - Not Designated As Hedging Instruments [Member] - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Commodity Purchases [Line Items]
Liability value	$ 12	$ 18
Asset value	76	0
Other deferred credits and noncurrent liabilities [Member] \| Gas Contracts
Commodity Purchases [Line Items]
Liability value	1	0
Price risk management assets, noncurrent [Member] \| Gas Contracts
Commodity Purchases [Line Items]
Asset value	16	0
Price risk management assets, current [Member] \| Gas Contracts
Commodity Purchases [Line Items]
Asset value	$ 60	$ 0

Fair value, before 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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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