Subsequent Events - Narrative (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($)
Subsequent Event [Line Items]
Debt Instrument, Collateral Amount	$ 2,000
Texas-based generating assets
Subsequent Event [Line Items]
Other Cost and Expense, Operating	$ 800

The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

Name:	us-gaap_OtherCostAndExpenseOperating
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration