Summary of Significant Accounting Policies - Additional (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Securitization Proceeds [Abstract]
Proceeds from ERCOT	$ 689
Funds Deposited by Counterparties
Number of months beyond which company can not predict the holding of collateral (in months)		12 months
Loss Contingency [Abstract]
Insurance settlement		$ 81
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets, accumulated amortization		2,112	$ 1,636
Gross Receipts and Sales Taxes
Gross receipts taxes		218	184	$ 107
Purchased Energy and Other Cost of Sales for Customer Operations
Transmission and distribution charges not yet billed		202	189	98
Foreign Currency Translation and Transaction Gains and Losses
Foreign currency transaction losses		(7)
Cumulative translation adjustment		55	(8)	(2)
Marketing and Advertising Costs
Advertising expense		$ 82	$ 109	$ 74
South Texas Project
Property, Plant and Equipment
Ownership Interest (as a percent)		44.00%