Summary of Significant Accounting Policies - NPC - Narrative (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) reportableSegment operatingSegment	Dec. 31, 2020 USD ($)
Inventory [Line Items]
Inventory, raw materials and supplies, gross	$ 826	$ 786
Number of reportable segments \| operatingSegment	8
NPC
Inventory [Line Items]
Inventory, raw materials and supplies, gross	$ 64	$ 69
AFUDC rate	7.14%	7.43%
Unbilled contracts receivable	$ 107	$ 104
Contractual assets	$ 6	$ 8
Number of reportable segments \| reportableSegment	1

Contractual Assets

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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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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Effective rate, including composite rate, of cost of financing additions to qualifying regulated assets, commonly called allowance for funds used during construction.

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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